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Documentation Monitor changes

Monitor changes

Find new entries in the register and get notified.

When something changes for a company in the register, you usually want to know quickly. There are four ways to do that. The table helps you choose; below it, each way is described with an example.

The ways compared

Way
Way Good for You need Costs
Poll yourself Single companies, any fields of the company profile, your own schedule A cron job and storage for the last state The price of the company profile per fetch
Signals Changes across all companies by topic and period, or targeted for up to 5 companies Regular requests through the API 20 credits per page
Monitoring Selected companies; we check on a fixed schedule and report by webhook A publicly reachable HTTPS endpoint One cycle price per monitor for 30 days
Watchlist Following along without your own server, in the browser or a feed reader Just the web app 20 credits per feed update, at most once per hour

Signals, Monitoring and the watchlist use the same topics. New registrations, master data changes, closures & dissolutions, management changes and capital changes are available for every account. Insolvencies come with Pro, Transformations & M&A with Max.

Poll yourself with fetch-organization

If you only care about certain fields, fetch the company profile regularly and compare it with the last state. Request it with the entity_id and the features you want to compare. In the example, that is Hetzner Online GmbH, Ansbach HRB 6089. 

curl -G "https://handelsregister.ai/api/v1/fetch-organization" \
  -H "x-api-key: YOUR_API_KEY" \
  --data-urlencode 'q=94eb910fef13f94585c48c263fa446d4' \
  --data-urlencode 'feature=related_persons'
1{2  "entity_id": "94eb910fef13f94585c48c263fa446d4",3  "name": "Hetzner Online GmbH",4  "status": "ACTIVE",5  "address": {6    "house_number": "25",7    "street": "Industriestraße",8    "postal_code": "91710",9    "city": "Gunzenhausen",10    "county": "Weißenburg-Gunzenhausen",11    "state": "Bayern",12    "country": "DEU",13    "coordinates": {14      "latitude": 49.12483,15      "longitude": 10.7805216    }17  },18  "capital": {19    "current": {20      "amount": 50000,21      "currency": "EUR",22      "kind": "STAMMKAPITAL"23    },24    "history": [25      {26        "value": {27          "amount": 50000,28          "currency": "EUR",29          "kind": "GRUNDKAPITAL"30        },31        "effective_from": "2002-10-15",32        "effective_to": null33      }34    ]35  },36  "related_persons": {37    "current": [38      {39        "entity_id": "ea3a1670232611a992727ed067216d07",40        "label": "MANAGING_DIRECTOR",41        "role": {42          "en": {43            "long": "Managing Director",44            "short": "MD"45          },46          "de": {47            "long": "Geschäftsführer",48            "short": "GF"49          }50        },51        "name": "Paul Musterwald",52        "start_date": "2019-01-04",53        "end_date": null,54        "birth_date": "1989-07-18",55        "name_parts": {56          "given": "Paul",57          "family": "Musterwald",58          "maiden": null,59          "canonical_name": "Musterwald, Paul",60          "previous_names": null61        },62        "location": {63          "home": {64            "city": "Exempelingen i. Bay."65          }66        },67        "organization_representation_scheme": {68          "current": [69            "Ist nur ein Geschäftsführer bestellt, so vertritt er die Gesellschaft allein. Sind mehrere Geschäftsführer bestellt, so wird die Gesellschaft durch zwei Geschäftsführer oder durch einen Geschäftsführer gemeinsam mit einem Prokuristen vertreten."70          ],71          "history": [72            {73              "value": [74                "Ist nur ein Vorstandsmitglied bestellt, so vertritt es die Gesellschaft allein. Sind mehrere Vorstandsmitglieder bestellt, so wird die Gesellschaft durch zwei Vorstandsmitglieder oder durch ein Vorstandsmitglied gemeinsam mit einem Prokuristen vertreten."75              ],76              "effective_from": "2002-10-15",77              "effective_to": "2015-07-28"78            },79            {80              "value": [81                "Ist nur ein Geschäftsführer bestellt, so vertritt er die Gesellschaft allein. Sind mehrere Geschäftsführer bestellt, so wird die Gesellschaft durch zwei Geschäftsführer oder durch einen Geschäftsführer gemeinsam mit einem Prokuristen vertreten."82              ],83              "effective_from": "2015-07-28",84              "effective_to": null85            }86          ]87        },88        "role_representation_scheme": {89          "current": [90            "einzelvertretungsberechtigt."91          ],92          "history": [93            {94              "value": [95                "einzelvertretungsberechtigt."96              ],97              "effective_from": "2019-01-04",98              "effective_to": null99            }100          ]101        }102      },103      {104        "entity_id": "dd7e94b41f78de4195cc70c6b0f732f3",105        "label": "MANAGING_DIRECTOR",106        "role": {107          "en": {108            "long": "Managing Director",109            "short": "MD"110          },111          "de": {112            "long": "Geschäftsführer",113            "short": "GF"114          }115        },116        "name": "Jan Musterhuber",117        "start_date": "2019-01-04",118        "end_date": null,119        "birth_date": "1955-11-06",120        "name_parts": {121          "given": "Jan",122          "family": "Musterhuber",123          "maiden": null,124          "canonical_name": "Musterhuber, Jan",125          "previous_names": null126        },127        "location": {128          "home": {129            "city": "Probeingen"130          }131        },132        "organization_representation_scheme": {133          "current": [134            "Ist nur ein Geschäftsführer bestellt, so vertritt er die Gesellschaft allein. Sind mehrere Geschäftsführer bestellt, so wird die Gesellschaft durch zwei Geschäftsführer oder durch einen Geschäftsführer gemeinsam mit einem Prokuristen vertreten."135          ],136          "history": [137            {138              "value": [139                "Ist nur ein Vorstandsmitglied bestellt, so vertritt es die Gesellschaft allein. Sind mehrere Vorstandsmitglieder bestellt, so wird die Gesellschaft durch zwei Vorstandsmitglieder oder durch ein Vorstandsmitglied gemeinsam mit einem Prokuristen vertreten."140              ],141              "effective_from": "2002-10-15",142              "effective_to": "2015-07-28"143            },144            {145              "value": [146                "Ist nur ein Geschäftsführer bestellt, so vertritt er die Gesellschaft allein. Sind mehrere Geschäftsführer bestellt, so wird die Gesellschaft durch zwei Geschäftsführer oder durch einen Geschäftsführer gemeinsam mit einem Prokuristen vertreten."147              ],148              "effective_from": "2015-07-28",149              "effective_to": null150            }151          ]152        },153        "role_representation_scheme": {154          "current": [155            "einzelvertretungsberechtigt."156          ],157          "history": [158            {159              "value": [160                "einzelvertretungsberechtigt."161              ],162              "effective_from": "2019-01-04",163              "effective_to": null164            }165          ]166        }167      },168      {169        "entity_id": "08ed5f967956831ca6588930fd2693ed",170        "label": "MANAGING_DIRECTOR",171        "role": {172          "en": {173            "long": "Managing Director",174            "short": "MD"175          },176          "de": {177            "long": "Geschäftsführer",178            "short": "GF"179          }180        },181        "name": "Max Felix Mustermann",182        "start_date": "2015-07-28",183        "end_date": null,184        "birth_date": "1976-01-15",185        "name_parts": {186          "given": "Max Felix",187          "family": "Mustermann",188          "maiden": null,189          "canonical_name": "Mustermann, Max Felix",190          "previous_names": null191        },192        "location": {193          "home": {194            "city": "Musterheim"195          }196        },197        "organization_representation_scheme": {198          "current": [199            "Ist nur ein Geschäftsführer bestellt, so vertritt er die Gesellschaft allein. Sind mehrere Geschäftsführer bestellt, so wird die Gesellschaft durch zwei Geschäftsführer oder durch einen Geschäftsführer gemeinsam mit einem Prokuristen vertreten."200          ],201          "history": [202            {203              "value": [204                "Ist nur ein Vorstandsmitglied bestellt, so vertritt es die Gesellschaft allein. Sind mehrere Vorstandsmitglieder bestellt, so wird die Gesellschaft durch zwei Vorstandsmitglieder oder durch ein Vorstandsmitglied gemeinsam mit einem Prokuristen vertreten."205              ],206              "effective_from": "2002-10-15",207              "effective_to": "2015-07-28"208            },209            {210              "value": [211                "Ist nur ein Geschäftsführer bestellt, so vertritt er die Gesellschaft allein. Sind mehrere Geschäftsführer bestellt, so wird die Gesellschaft durch zwei Geschäftsführer oder durch einen Geschäftsführer gemeinsam mit einem Prokuristen vertreten."212              ],213              "effective_from": "2015-07-28",214              "effective_to": null215            }216          ]217        },218        "role_representation_scheme": {219          "current": [220            "einzelvertretungsberechtigt; mit der Befugnis, im Namen der Gesellschaft mit sich im eigenen Namen oder als Vertreter eines Dritten Rechtsgeschäfte abzuschließen."221          ],222          "history": [223            {224              "value": [225                "einzelvertretungsberechtigt; mit der Befugnis, im Namen der Gesellschaft mit sich im eigenen Namen oder als Vertreter eines Dritten Rechtsgeschäfte abzuschließen."226              ],227              "effective_from": "2015-07-28",228              "effective_to": null229            }230          ]231        }232      }233    ],234    "past": [235      {236        "entity_id": "ea3a1670232611a992727ed067216d07",237        "label": "PROCURA",238        "role": {239          "en": {240            "long": "Procura",241            "short": "Procura"242          },243          "de": {244            "long": "Prokura",245            "short": "Prokura"246          }247        },248        "name": "Paul Musterwald",249        "start_date": "2015-07-28",250        "end_date": "2019-01-04",251        "birth_date": "1989-07-18",252        "name_parts": {253          "given": "Paul",254          "family": "Musterwald",255          "maiden": null,256          "canonical_name": "Musterwald, Paul",257          "previous_names": null258        },259        "location": {260          "home": {261            "city": "Exempelingen i. Bay."262          }263        },264        "organization_representation_scheme": {265          "latest": [266            "Ist nur ein Geschäftsführer bestellt, so vertritt er die Gesellschaft allein. Sind mehrere Geschäftsführer bestellt, so wird die Gesellschaft durch zwei Geschäftsführer oder durch einen Geschäftsführer gemeinsam mit einem Prokuristen vertreten."267          ],268          "history": [269            {270              "value": [271                "Ist nur ein Vorstandsmitglied bestellt, so vertritt es die Gesellschaft allein. Sind mehrere Vorstandsmitglieder bestellt, so wird die Gesellschaft durch zwei Vorstandsmitglieder oder durch ein Vorstandsmitglied gemeinsam mit einem Prokuristen vertreten."272              ],273              "effective_from": "2002-10-15",274              "effective_to": "2015-07-28"275            },276            {277              "value": [278                "Ist nur ein Geschäftsführer bestellt, so vertritt er die Gesellschaft allein. Sind mehrere Geschäftsführer bestellt, so wird die Gesellschaft durch zwei Geschäftsführer oder durch einen Geschäftsführer gemeinsam mit einem Prokuristen vertreten."279              ],280              "effective_from": "2015-07-28",281              "effective_to": null282            }283          ]284        },285        "role_representation_scheme": {286          "latest": [287            "Gesamtprokura gemeinsam mit einem anderen Prokuristen:"288          ],289          "history": [290            {291              "value": [292                "Gesamtprokura gemeinsam mit einem anderen Prokuristen:"293              ],294              "effective_from": "2015-07-28",295              "effective_to": "2019-01-04"296            }297          ]298        }299      },300      {301        "entity_id": "dd7e94b41f78de4195cc70c6b0f732f3",302        "label": "PROCURA",303        "role": {304          "en": {305            "long": "Procura",306            "short": "Procura"307          },308          "de": {309            "long": "Prokura",310            "short": "Prokura"311          }312        },313        "name": "Jan Musterhuber",314        "start_date": "2015-07-28",315        "end_date": "2019-01-04",316        "birth_date": "1955-11-06",317        "name_parts": {318          "given": "Jan",319          "family": "Musterhuber",320          "maiden": null,321          "canonical_name": "Musterhuber, Jan",322          "previous_names": null323        },324        "location": {325          "home": {326            "city": "Probeingen"327          }328        },329        "organization_representation_scheme": {330          "latest": [331            "Ist nur ein Geschäftsführer bestellt, so vertritt er die Gesellschaft allein. Sind mehrere Geschäftsführer bestellt, so wird die Gesellschaft durch zwei Geschäftsführer oder durch einen Geschäftsführer gemeinsam mit einem Prokuristen vertreten."332          ],333          "history": [334            {335              "value": [336                "Ist nur ein Vorstandsmitglied bestellt, so vertritt es die Gesellschaft allein. Sind mehrere Vorstandsmitglieder bestellt, so wird die Gesellschaft durch zwei Vorstandsmitglieder oder durch ein Vorstandsmitglied gemeinsam mit einem Prokuristen vertreten."337              ],338              "effective_from": "2002-10-15",339              "effective_to": "2015-07-28"340            },341            {342              "value": [343                "Ist nur ein Geschäftsführer bestellt, so vertritt er die Gesellschaft allein. Sind mehrere Geschäftsführer bestellt, so wird die Gesellschaft durch zwei Geschäftsführer oder durch einen Geschäftsführer gemeinsam mit einem Prokuristen vertreten."344              ],345              "effective_from": "2015-07-28",346              "effective_to": null347            }348          ]349        },350        "role_representation_scheme": {351          "latest": [352            "Gesamtprokura gemeinsam mit einem anderen Prokuristen:"353          ],354          "history": [355            {356              "value": [357                "Gesamtprokura gemeinsam mit einem anderen Prokuristen:"358              ],359              "effective_from": "2015-07-28",360              "effective_to": "2019-01-04"361            }362          ]363        }364      },365      {366        "entity_id": "08ed5f967956831ca6588930fd2693ed",367        "label": "BOARD",368        "role": {369          "en": {370            "long": "Board Member",371            "short": "Board"372          },373          "de": {374            "long": "Vorstandsmitglied",375            "short": "Vorstand"376          }377        },378        "name": "Max Felix Mustermann",379        "start_date": "2002-10-15",380        "end_date": "2015-07-28",381        "birth_date": "1976-01-15",382        "name_parts": {383          "given": "Max Felix",384          "family": "Mustermann",385          "maiden": null,386          "canonical_name": "Mustermann, Max Felix",387          "previous_names": null388        },389        "location": {390          "home": {391            "city": "Musterheim"392          }393        },394        "organization_representation_scheme": {395          "latest": [396            "Ist nur ein Geschäftsführer bestellt, so vertritt er die Gesellschaft allein. Sind mehrere Geschäftsführer bestellt, so wird die Gesellschaft durch zwei Geschäftsführer oder durch einen Geschäftsführer gemeinsam mit einem Prokuristen vertreten."397          ],398          "history": [399            {400              "value": [401                "Ist nur ein Vorstandsmitglied bestellt, so vertritt es die Gesellschaft allein. Sind mehrere Vorstandsmitglieder bestellt, so wird die Gesellschaft durch zwei Vorstandsmitglieder oder durch ein Vorstandsmitglied gemeinsam mit einem Prokuristen vertreten."402              ],403              "effective_from": "2002-10-15",404              "effective_to": "2015-07-28"405            },406            {407              "value": [408                "Ist nur ein Geschäftsführer bestellt, so vertritt er die Gesellschaft allein. Sind mehrere Geschäftsführer bestellt, so wird die Gesellschaft durch zwei Geschäftsführer oder durch einen Geschäftsführer gemeinsam mit einem Prokuristen vertreten."409              ],410              "effective_from": "2015-07-28",411              "effective_to": null412            }413          ]414        },415        "role_representation_scheme": {416          "latest": [417            "einzelvertretungsberechtigt; mit der Befugnis, im Namen der Gesellschaft mit sich im eigenen Namen oder als Vertreter eines Dritten Rechtsgeschäfte abzuschließen"418          ],419          "history": [420            {421              "value": [422                "einzelvertretungsberechtigt; mit der Befugnis, im Namen der Gesellschaft mit sich im eigenen Namen oder als Vertreter eines Dritten Rechtsgeschäfte abzuschließen"423              ],424              "effective_from": "2002-10-15",425              "effective_to": "2015-07-28"426            }427          ]428        }429      }430    ]431  },432  "meta": {433    "request_credit_cost": 7,434    "credits_remaining": 145435  }436}
200 · Example response: company profile of Hetzner Online GmbH with management (excerpt)

The script compares name, status, address, capital and management with the last run and prints every change. Run it, for example, once a week as a cron job.

Python script 
import json
import pathlib

import requests

API = "https://handelsregister.ai/api/v1/fetch-organization"
HEADERS = {"x-api-key": "YOUR_API_KEY", "Accept": "application/json"}
COMPANIES = ["94eb910fef13f94585c48c263fa446d4"]  # the entity_ids of your companies
STATE = pathlib.Path("state.json")


def snapshot(entity_id):
    response = requests.get(
        API,
        params={"q": entity_id, "feature": "related_persons"},
        headers=HEADERS,
        timeout=120,
    )
    response.raise_for_status()
    data = response.json()
    persons = (data.get("related_persons") or {}).get("current") or []
    return {
        "name": data.get("name"),
        "status": data.get("status"),
        "address": data.get("address"),
        "capital": (data.get("capital") or {}).get("current"),
        "persons": sorted(f'{p["name"]} ({p["label"]})' for p in persons),
    }


old = json.loads(STATE.read_text()) if STATE.exists() else {}
new = {entity_id: snapshot(entity_id) for entity_id in COMPANIES}
for entity_id, now in new.items():
    before = old.get(entity_id)
    if before is None:
        continue
    for field, value in now.items():
        if before.get(field) != value:
            print(f"{now['name']}: {field} changed: {before.get(field)} -> {value}")
STATE.write_text(json.dumps(new, ensure_ascii=False, indent=2))

Each run costs up to 7 credits per company: the basic data and the management, the latter only when the API finds people. For many companies or short intervals, Signals or Monitoring are cheaper.

Search changes with Signals

Signals are changes from the Handelsregister (commercial register) and the insolvency notices, prepared as uniform events. You filter across all companies by topic (topics) and period (from, to). 

curl -G "https://handelsregister.ai/api/v1/signals" \
  -H "x-api-key: YOUR_API_KEY" \
  --data-urlencode 'topics=CAPITAL_CHANGES' \
  --data-urlencode 'from=2026-10-26' \
  --data-urlencode 'to=2026-10-30'
1{2  "signals": [3    {4      "event": {5        "id": "3abb946f2d6030f1619ed833b226faed",6        "topic": "CAPITAL_CHANGES",7        "topic_name": {8          "de": "Kapitaländerungen",9          "en": "Capital changes"10        },11        "occurred_on": "2026-10-30",12        "announced_on": "2026-10-30",13        "date_basis": "REGISTER_ENTRY"14      },15      "organization": {16        "type": "ORGANIZATION",17        "entity_id": "c6b0c0721497f190aa5dfca1d4573c98",18        "current_profile": {19          "name": "Hans Hörner GmbH",20          "registration": {21            "register_type": "HRB",22            "register_number": "113000",23            "court": "München",24            "register_locality": "Munich",25            "registration_authority_id": "D2601",26            "register_entity_name": "München HRB 113000"27          },28          "legal_form": {29            "name": {30              "de": "Gesellschaft mit beschränkter Haftung"31            },32            "short": {33              "de": "GmbH"34            }35          },36          "seat": {37            "city": "Grafing"38          },39          "status": {40            "code": "ACTIVE"41          }42        }43      },44      "register_entry": {45        "entry_number": "4",46        "entry_date": "2026-10-30",47        "phase": "DECREASED",48        "description_text": "Herabsetzung des Stammkapitals um 25.000,00 EUR auf 25.000,00 EUR",49        "context": "PRIMARY",50        "flags": []51      },52      "source": {53        "kind": "COMMERCIAL_REGISTER"54      },55      "details": {56        "schema": "CAPITAL_CHANGE",57        "capital_kind": "SHARE_CAPITAL",58        "resulting_amount": {59          "amount": "25000.00",60          "currency": "EUR",61          "source_text": "25.000,00 EUR"62        },63        "change_amount": {64          "amount": "25000.00",65          "currency": "EUR",66          "source_text": "25.000,00 EUR"67        }68      }69    },70    {71      "event": {72        "id": "ba5eab558e65d2a4c3059b35e2d155a5",73        "topic": "CAPITAL_CHANGES",74        "topic_name": {75          "de": "Kapitaländerungen",76          "en": "Capital changes"77        },78        "occurred_on": "2026-10-30",79        "announced_on": "2026-10-30",80        "date_basis": "REGISTER_ENTRY"81      },82      "organization": {83        "type": "ORGANIZATION",84        "entity_id": "9bdf1b5c1ae812a39971e45be7d23bb5",85        "current_profile": {86          "name": "Communardo Technologies Group GmbH",87          "registration": {88            "register_type": "HRB",89            "register_number": "46202",90            "court": "Dresden",91            "register_locality": "Dresden",92            "registration_authority_id": "U1104",93            "register_entity_name": "Dresden HRB 46202"94          },95          "legal_form": {96            "name": {97              "de": "Gesellschaft mit beschränkter Haftung"98            },99            "short": {100              "de": "GmbH"101            }102          },103          "seat": {104            "city": "Dresden"105          },106          "status": {107            "code": "ACTIVE"108          }109        }110      },111      "register_entry": {112        "entry_number": "7",113        "entry_date": "2026-10-30",114        "phase": "INCREASED",115        "description_text": "Erhöhung des Stammkapitals um 761,00 EUR auf 32.326,00 EUR",116        "context": "PRIMARY",117        "flags": []118      },119      "source": {120        "kind": "COMMERCIAL_REGISTER"121      },122      "details": {123        "schema": "CAPITAL_CHANGE",124        "capital_kind": "SHARE_CAPITAL",125        "resulting_amount": {126          "amount": "32326.00",127          "currency": "EUR",128          "source_text": "32.326,00 EUR"129        },130        "change_amount": {131          "amount": "761.00",132          "currency": "EUR",133          "source_text": "761,00 EUR"134        }135      }136    },137    {138      "event": {139        "id": "666de98109b29e5270113942cee06f12",140        "topic": "CAPITAL_CHANGES",141        "topic_name": {142          "de": "Kapitaländerungen",143          "en": "Capital changes"144        },145        "occurred_on": "2026-10-29",146        "announced_on": "2026-10-29",147        "date_basis": "REGISTER_ENTRY"148      },149      "organization": {150        "type": "ORGANIZATION",151        "entity_id": "979610227990c4c5368c9356923080df",152        "current_profile": {153          "name": "Norlando GmbH",154          "registration": {155            "register_type": "HRB",156            "register_number": "25441",157            "court": "Bonn",158            "register_locality": "Bonn",159            "registration_authority_id": "R3201",160            "register_entity_name": "Bonn HRB 25441"161          },162          "legal_form": {163            "name": {164              "de": "Gesellschaft mit beschränkter Haftung"165            },166            "short": {167              "de": "GmbH"168            }169          },170          "seat": {171            "city": "Bonn"172          },173          "status": {174            "code": "ACTIVE"175          }176        }177      },178      "register_entry": {179        "entry_number": "2",180        "entry_date": "2026-10-29",181        "phase": "INCREASED",182        "description_text": "Erhöhung des Stammkapitals von 25.000,00 EUR um 75.000,00 EUR auf 100.000,00 EUR",183        "context": "PRIMARY",184        "flags": []185      },186      "source": {187        "kind": "COMMERCIAL_REGISTER"188      },189      "details": {190        "schema": "CAPITAL_CHANGE",191        "capital_kind": "SHARE_CAPITAL",192        "resulting_amount": {193          "amount": "100000.00",194          "currency": "EUR",195          "source_text": "100.000,00 EUR"196        },197        "change_amount": {198          "amount": "75000.00",199          "currency": "EUR",200          "source_text": "75.000,00 EUR"201        }202      }203    },204    {205      "event": {206        "id": "608f0aaddc78a4b9337587f111de0ece",207        "topic": "CAPITAL_CHANGES",208        "topic_name": {209          "de": "Kapitaländerungen",210          "en": "Capital changes"211        },212        "occurred_on": "2026-10-29",213        "announced_on": "2026-10-29",214        "date_basis": "REGISTER_ENTRY"215      },216      "organization": {217        "type": "ORGANIZATION",218        "entity_id": "2dea43c1c48f00f33709b577bec048b0",219        "current_profile": {220          "name": "Aksahin Holding GmbH",221          "registration": {222            "register_type": "HRB",223            "register_number": "10252",224            "court": "Recklinghausen",225            "register_locality": "Recklinghausen",226            "registration_authority_id": "R2204",227            "register_entity_name": "Recklinghausen HRB 10252"228          },229          "legal_form": {230            "name": {231              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"type": "ORGANIZATION",1009        "entity_id": "f97e7a325b4f85b8f37dc7024351c93c",1010        "current_profile": {1011          "name": "CPOT GmbH",1012          "registration": {1013            "register_type": "HRB",1014            "register_number": "128833",1015            "court": "Frankfurt am Main",1016            "register_locality": "Frankfurt",1017            "registration_authority_id": "M1201",1018            "register_entity_name": "Frankfurt am Main HRB 128833"1019          },1020          "legal_form": {1021            "name": {1022              "de": "Gesellschaft mit beschränkter Haftung"1023            },1024            "short": {1025              "de": "GmbH"1026            }1027          },1028          "seat": {1029            "city": "Frankfurt am Main"1030          },1031          "status": {1032            "code": "ACTIVE"1033          }1034        }1035      },1036      "register_entry": {1037        "entry_number": "3",1038        "entry_date": "2026-10-28",1039        "phase": "INCREASED",1040        "description_text": "Erhöhung des Stammkapitals um 24.000,00 EUR auf 25.000,00 EUR",1041        "context": "PRIMARY",1042        "flags": []1043      },1044      "source": {1045        "kind": "COMMERCIAL_REGISTER"1046      },1047      "details": {1048        "schema": "CAPITAL_CHANGE",1049        "capital_kind": "SHARE_CAPITAL",1050        "resulting_amount": {1051          "amount": "25000.00",1052          "currency": "EUR",1053          "source_text": "25.000,00 EUR"1054        },1055        "change_amount": {1056          "amount": "24000.00",1057          "currency": "EUR",1058          "source_text": "24.000,00 EUR"1059        }1060      }1061    },1062    {1063      "event": {1064        "id": "4563a35c76e510cdd2a68f98d935fcbb",1065        "topic": "CAPITAL_CHANGES",1066        "topic_name": {1067          "de": "Kapitaländerungen",1068          "en": "Capital changes"1069        },1070        "occurred_on": "2026-10-28",1071        "announced_on": "2026-10-28",1072        "date_basis": "REGISTER_ENTRY"1073      },1074      "organization": {1075        "type": "ORGANIZATION",1076        "entity_id": "3199feaf239ac1b9a5e45f6ea45a3c61",1077        "current_profile": {1078          "name": "Brave2change UG (haftungsbeschränkt)",1079          "registration": {1080            "register_type": "HRB",1081            "register_number": "270781",1082            "court": "München",1083            "register_locality": "Munich",1084            "registration_authority_id": "D2601",1085            "register_entity_name": "München HRB 270781"1086          },1087          "legal_form": {1088            "name": {1089              "de": "Unternehmergesellschaft (haftungsbeschränkt)"1090            },1091            "short": {1092              "de": "UG (haftungsbeschränkt)"1093            }1094          },1095          "seat": {1096            "city": "München"1097          },1098          "status": {1099            "code": "ACTIVE"1100          }1101        }1102      },1103      "register_entry": {1104        "entry_number": "2",1105        "entry_date": "2026-10-28",1106        "phase": "INCREASED",1107        "description_text": "Erhöhung des Stammkapitals um 1.400,- EUR auf 2.400,00 EUR",1108        "context": "PRIMARY",1109        "flags": []1110      },1111      "source": {1112        "kind": "COMMERCIAL_REGISTER"1113      },1114      "details": {1115        "schema": "CAPITAL_CHANGE",1116        "capital_kind": "SHARE_CAPITAL",1117        "resulting_amount": {1118          "amount": "2400.00",1119          "currency": "EUR",1120          "source_text": "2.400,00 EUR"1121        },1122        "change_amount": {1123          "amount": "1400.00",1124          "currency": "EUR",1125          "source_text": "1.400,- EUR"1126        }1127      }1128    },1129    {1130      "event": {1131        "id": "f810560be252c43dc031564fdb8fe653",1132        "topic": "CAPITAL_CHANGES",1133        "topic_name": {1134          "de": "Kapitaländerungen",1135          "en": "Capital changes"1136        },1137        "occurred_on": "2026-10-28",1138        "announced_on": "2026-10-28",1139        "date_basis": "REGISTER_ENTRY"1140      },1141      "organization": {1142        "type": "ORGANIZATION",1143        "entity_id": "d45fcce5200b18bf2f377c6f1a785897",1144        "current_profile": {1145          "name": "Benfele Ritter Ventures UG (haftungsbeschränkt)",1146          "registration": {1147            "register_type": "HRB",1148            "register_number": "307694",1149            "court": "München",1150            "register_locality": "Munich",1151            "registration_authority_id": "D2601",1152            "register_entity_name": "München HRB 307694"1153          },1154          "legal_form": {1155            "name": {1156              "de": "Unternehmergesellschaft (haftungsbeschränkt)"1157            },1158            "short": {1159              "de": "UG (haftungsbeschränkt)"1160            }1161          },1162          "seat": {1163            "city": "Unterföhring"1164          },1165          "status": {1166            "code": "ACTIVE"1167          }1168        }1169      },1170      "register_entry": {1171        "entry_number": "2",1172        "entry_date": "2026-10-28",1173        "phase": "INCREASED",1174        "description_text": "Erhöhung des Stammkapitals um 100,00 EUR auf 1.100,00 EUR",1175        "context": "PRIMARY",1176        "flags": []1177      },1178      "source": {1179        "kind": "COMMERCIAL_REGISTER"1180      },1181      "details": {1182        "schema": "CAPITAL_CHANGE",1183        "capital_kind": "SHARE_CAPITAL",1184        "resulting_amount": {1185          "amount": "1100.00",1186          "currency": "EUR",1187          "source_text": "1.100,00 EUR"1188        },1189        "change_amount": {1190          "amount": "100.00",1191          "currency": "EUR",1192          "source_text": "100,00 EUR"1193        }1194      }1195    },1196    {1197      "event": {1198        "id": "6d08eadf8c4fc9495d33af7c12d28f75",1199        "topic": "CAPITAL_CHANGES",1200        "topic_name": {1201          "de": "Kapitaländerungen",1202          "en": "Capital changes"1203        },1204        "occurred_on": "2026-10-27",1205        "announced_on": "2026-10-27",1206        "date_basis": "REGISTER_ENTRY"1207      },1208      "organization": {1209        "type": "ORGANIZATION",1210        "entity_id": "35dd2dbced656dd36cd55871f0b33a5e",1211        "current_profile": {1212          "name": "TÜNKERS-NICKEL Systeme GmbH",1213          "registration": {1214            "register_type": "HRB",1215            "register_number": "13742",1216            "court": "Siegburg",1217            "register_locality": "Siegburg",1218            "registration_authority_id": "R3208",1219            "register_entity_name": "Siegburg HRB 13742"1220          },1221          "legal_form": {1222            "name": {1223              "de": "Gesellschaft mit beschränkter Haftung"1224            },1225            "short": {1226              "de": "GmbH"1227            }1228          },1229          "seat": {1230            "city": "Troisdorf-Spich"1231          },1232          "status": {1233            "code": "ACTIVE"1234          }1235        }1236      },1237      "register_entry": {1238        "entry_number": "5",1239        "entry_date": "2026-10-27",1240        "phase": "INCREASED",1241        "description_text": "Erhöhung des Stammkapitals von 100.000,00 EUR um 112.500,00 EUR auf 212.500,00 EUR",1242        "context": "PRIMARY",1243        "flags": []1244      },1245      "source": {1246        "kind": "COMMERCIAL_REGISTER"1247      },1248      "details": {1249        "schema": "CAPITAL_CHANGE",1250        "capital_kind": "SHARE_CAPITAL",1251        "resulting_amount": {1252          "amount": "212500.00",1253          "currency": "EUR",1254          "source_text": "212.500,00 EUR"1255        },1256        "change_amount": {1257          "amount": "112500.00",1258          "currency": "EUR",1259          "source_text": "112.500,00 EUR"1260        }1261      }1262    },1263    {1264      "event": {1265        "id": "4851a8e6a7864e9efa3b7885b541897b",1266        "topic": "CAPITAL_CHANGES",1267        "topic_name": {1268          "de": "Kapitaländerungen",1269          "en": "Capital changes"1270        },1271        "occurred_on": "2026-10-27",1272        "announced_on": "2026-10-27",1273        "date_basis": "REGISTER_ENTRY"1274      },1275      "organization": {1276        "type": "ORGANIZATION",1277        "entity_id": "559c21619a8dfe0fbe549aec884afdad",1278        "current_profile": {1279          "name": "Wildkost und Feinfleisch JFG GmbH",1280          "registration": {1281            "register_type": "HRB",1282            "register_number": "262241",1283            "court": "Charlottenburg (Berlin)",1284            "register_locality": "Berlin",1285            "registration_authority_id": "F1103",1286            "register_entity_name": "Charlottenburg (Berlin) HRB 262241"1287          },1288          "legal_form": {1289            "name": {1290              "de": "Gesellschaft mit beschränkter Haftung"1291            },1292            "short": {1293              "de": "GmbH"1294            }1295          },1296          "seat": {1297            "city": "Berlin"1298          },1299          "status": {1300            "code": "ACTIVE"1301          }1302        }1303      },1304      "register_entry": {1305        "entry_number": "2",1306        "entry_date": "2026-10-27",1307        "phase": "INCREASED",1308        "description_text": "Stammkapital um 24.500,00 EUR auf 25.000,00 EUR erhöht.",1309        "context": "PRIMARY",1310        "flags": []1311      },1312      "source": {1313        "kind": "COMMERCIAL_REGISTER"1314      },1315      "details": {1316        "schema": "CAPITAL_CHANGE",1317        "capital_kind": "SHARE_CAPITAL",1318        "resulting_amount": {1319          "amount": "25000.00",1320          "currency": "EUR",1321          "source_text": "25.000,00 EUR"1322        },1323        "change_amount": {1324          "amount": "24500.00",1325          "currency": "EUR",1326          "source_text": "24.500,00 EUR"1327        }1328      }1329    }1330  ],1331  "pagination": {1332    "mode": "CURSOR",1333    "limit": 20,1334    "returned": 20,1335    "has_more": true,1336    "next_cursor": "sgc1.eyJiIjoiYjdlYTk2ODM1YjQxIiwiZyI6eyJnOGM2YzZkMDYiOnsiYyI6ImV5Sm1Jam9pTlROaU5EQmxPRFppT0RnelpqSXdZeUlzSW1sa0lqb2lObUZsTlRReU1UQXdPR001TVdKbU1XVXlNREF5TXpVMklpd2lhV1IwSWpvaWIySnFaV04wYVdRaUxDSnlJam9pTWpBeU5pMHdOeTB5T1M0eUlpd2ljeUk2SWpFdU1TSXNJbk5qSWpvaU5HWmxabVk0TVRSaU5tWTBNekF4WVNJc0luTmtJam9pTWpBeU5pMHhNQzB5TjFRd01Eb3dNRG93TUNJc0luTnZJam9pWVc1dWIzVnVZMlZ0Wlc1MFgyUmhkR1VpTENKMElqb3hOemt6TlRJeE9URXpmUS52WHRYZTljSjQ1THp4U25VRnR3cEtBIiwibiI6MCwibCI6bnVsbCwieCI6ZmFsc2V9fX0"1337  },1338  "filters": {1339    "topics": [1340      "CAPITAL_CHANGES"1341    ],1342    "organization_ids": [],1343    "from": "2026-10-26",1344    "to": "2026-10-30"1345  },1346  "warnings": [],1347  "meta": {1348    "generated_at": "2026-11-01T08:31:53+00:00",1349    "profiles_resolved_at": "2026-11-01T08:31:53+00:00",1350    "schema_version": "1.0",1351    "request_id": "req_01m6b3s49jw8hfrc1atz8rk0f2",1352    "request_credit_cost": 20,1353    "credits_remaining": 1451354  }1355}
200 · Example response: capital changes announced from October 26 to 30, 2026 (excerpt)

A page contains up to 20 Signals, the most recent first, and costs 20 credits. If there are more, pagination.next_cursor holds a pointer to the next page. Pass it back as cursor with the same filters.

from and to refer to the date of the announcement (announced_on). The event itself (occurred_on) can be earlier, for example the resolution on a merger.

For specific companies, pass up to 5 entity_ids in organization_ids. For a daily sync, request the last few days and keep paging until has_more is false.

A signal can appear somewhat later than its announcement and show up on several pages. So request overlapping periods and remove duplicates by event.id.

Watch single companies with Monitoring

A monitor checks a company for new Signals every 1 to 30 days. We send each new signal as a signed webhook to your webhook endpoint. This is how you set it up:

  1. Create a webhook endpoint: in the web app under Monitoring, or through the API with POST /v1/account/webhook-endpoints and the fields name and url (HTTPS only). This request needs the admin token from Account › API keys in the header Authorization: Bearer …. The API key is not enough for this. The response contains the endpoint's id (wep_…) and the signing secret, which we show only once.
  2. Verify the endpoint with POST /v1/account/webhook-endpoints/{id}/verify. We then send a message of type endpoint.verification. Your endpoint responds within 15 seconds with 2xx and returns data.challenge in the header webhook-verification. Only then does it receive deliveries.
  3. Create the monitor, with entity_id, poll_interval_days and the id from step 1 in endpoint_ids.
cURL 
curl -X POST "https://handelsregister.ai/api/v1/account/monitors" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Idempotency-Key: monitor-hetzner-1" \
  -H "Content-Type: application/json" \
  -d '{
    "entity_id": "94eb910fef13f94585c48c263fa446d4",
    "label": "Hetzner Online GmbH",
    "poll_interval_days": 7,
    "endpoint_ids": ["wep_YOUR_ENDPOINT_ID"]
  }'

Write requests to monitors need an Idempotency-Key. If you repeat one with the same key, no second monitor is created.

Creating a monitor is free. First the monitor marks the Signals of the last few days as known, without sending them. Then it books the price for the first cycle of 30 days and runs its first check right away.

Costs and limits
What Credits
Monitor checked every day, for 30 days 50
Monitor checked every 3 days, for 30 days 40
Monitor checked every 7 days, for 30 days 20
Monitor checked every 30 days, for 30 days 10
Each further successful check in the period +2

Limit: 30 requests per minute. Create, update and delete: 10 per minute.

You can ask what a schedule costs beforehand, for free: 

curl -G "https://handelsregister.ai/api/v1/account/monitoring/pricing" \
  -H "x-api-key: YOUR_API_KEY" \
  --data-urlencode 'poll_interval_days=7'
1{2  "pricing": {3    "policy_version": "2026-08.v2",4    "credits_per_run": 2,5    "cycle_minimum_credits": 20,6    "included_runs": 5,7    "cycle_days": 30,8    "estimated_runs": 5,9    "estimated_credits": 2010  },11  "entitled": true,12  "meta": {13    "request_credit_cost": 0,14    "credits_remaining": 14515  }16}
200 · Example response: price for a check every seven days

Pausing, resuming, changing the schedule and deleting are described under account/monitors.

Receive and verify webhooks

Each delivery is a POST with JSON. When verifying, we send a message with the type endpoint.verification. Respond with 2xx and set the header webhook-verification to the value from data.challenge. For a new signal, type is organization.signal.detected, and data.signal has the same format as an entry from signals.

Each delivery contains three headers:

Field
Field Meaning
webhook-id Identifier of the message, the same on retries. Use it to spot duplicates.
webhook-timestamp Time of this delivery attempt in Unix seconds.
webhook-signature One or more signatures of the form v1,…, separated by spaces.

The signature follows the open standard “Standard Webhooks”: HMAC-SHA256 over webhook-id.webhook-timestamp.body. The key is the part of the secret after whsec_, Base64-decoded. Verify the signature against the unchanged body before you process it. 

import base64
import hashlib
import hmac
import time


def verify_webhook(secret: str, headers: dict, body: bytes) -> bool:
    """Checks the signature of a delivery from handelsregister.ai."""
    msg_id = headers["webhook-id"]
    timestamp = headers["webhook-timestamp"]
    if abs(time.time() - int(timestamp)) > 5 * 60:
        return False  # older or newer than five minutes
    key = base64.b64decode(secret.removeprefix("whsec_"))
    signed = f"{msg_id}.{timestamp}.".encode() + body
    expected = base64.b64encode(hmac.new(key, signed, hashlib.sha256).digest()).decode()
    for candidate in headers["webhook-signature"].split(" "):
        version, _, signature = candidate.partition(",")
        if version == "v1" and hmac.compare_digest(signature, expected):
            return True
    return False

Respond within 15 seconds with 2xx and process afterwards. Without 2xx, we retry the delivery at growing intervals for up to about three days. After a secret rotation, messages carry both signatures for seven days.

Deliveries, retries and all fields are described under account/webhook-endpoints.

Watchlist and feeds

The watchlist is the way without your own server. In the web app under Monitoring, you follow a company with one click. Without a monitor, you can follow up to 15 companies. Companies with a monitor are on the watchlist automatically.

The watchlist shows the Signals of your companies from the last twelve months, the most recent first. With “Generate feed URL” you get them as an RSS or Atom feed for any feed reader.

The feed updates at most once per hour, no matter how often your reader fetches it. Each update costs 20 credits. If your balance is not enough, the feed shows the last state and updates again as soon as you have credits.

The URL contains a secret key and is shown only once. If you renew it, the old one stops working immediately. With ?lang=en, the feed comes in English.

You get the same data through the API from Signals with organization_ids.

Next

signals All parameters, topics and fields of Signals. account/monitors Create, change, pause and delete monitors. account/webhook-endpoints Webhook endpoints, payload and deliveries. Notices and events What each Signals topic covers.