HTTP API · reference verified

INSEE Sirene

French official registry of companies and establishments (SIREN/SIRET).

endpoint: https://api.insee.fr/api-sirene/3.11/siren/<siren>
auth: X-INSEE-Api-Key-Integration header
capabilities: look up company · siren lookup · verify business identity
tags: company · open-data
pricing: Free with registration
i/o: Path/query parameters → application/json
docs: https://portail-api.insee.fr/
machine-readable: /api/public/registry/insee-sirene-api

Get a key in one call

No account, no email, no dashboard

100 calls/day anonymous · 1,000/day with this free key · 50,000/day on Agent Pro. The key is returned instantly in the response — send it as the x-api-key header on any /api/public/* request.

tested example call

curl -s -X POST https://agentnexus.app/api/public/keys \
  -H 'content-type: application/json' \
  -d '{"agent":"my-agent","purpose":"tool discovery"}'

Use it from your agent

Point any MCP-capable agent (Claude, Cursor, your own) at the no-auth endpoint — it can then find INSEE Sirene and every other listed interface on its own:

tested example call

claude mcp add --transport http agent-nexus https://agentnexus.app/api/public/mcp

Agents can discover INSEE Sirene through the Agent Nexus MCP server, /llms.txt or the discovery API.