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Explorium is a B2B data foundation for AI agents and go-to-market teams. Its AgentSource API is a single external-data and enrichment platform - one REST API plus a native MCP server - that resolves, fetches, enriches, and monitors a business dataset of 150M+ companies and a prospect dataset of 800M+ people aggregated from 100+ external sources. It answers "web intelligence" and "reference data" needs: firmographics, technographics, webstack and web-traffic signals, financials, funding, workforce trends, verified contact data, and real-time business/prospect events.
Access model (honest): The API is gated but self-serve. You create an Explorium account, obtain an API key at https://admin.explorium.ai/api-key, and send it in the API_KEY header on every call to https://api.explorium.ai. A free developer tier of 100 credits (valid 90 days) lets you evaluate before buying prepaid credit packages (reported to start around $200 for 5,000 credits) or an enterprise agreement. All API surfaces - match, fetch, stats, autocomplete, 30+ enrichment endpoints, and events - draw from a single shared credit pool. The developer documentation, the OpenAPI index (/openapi.json), and the MCP server source (MIT) are publicly readable.
The endpoint paths and methods in this catalog are confirmed from Explorium's published OpenAPI index and reference pages; request/response schemas in the OpenAPI file are honestly modeled at a representative level, and a representative subset of the 30+ enrichment endpoints is included.
APIs.json: https://raw.githubusercontent.com/api-evangelist/explorium/refs/heads/main/apis.yml
- Data Enrichment
- Web Intelligence
- Reference Data
- B2B Data
- Company Data
- AI Agents
- Prospect Enrichment
- Firmographics
- MCP
- Created: 2026-07-11
- Modified: 2026-07-11
Fetch, market-size (stats), and enrich company records across 150M+ businesses. Includes 17+ single and bulk enrichment endpoints - firmographics, technographics, webstack, website traffic and changes, company website keywords, financial indicators, funding and acquisition, company hierarchies, workforce trends, lookalikes, and Bombora intent - each returning structured reference data for a matched business_id.
- Human URL: https://developers.explorium.ai/reference/businesses_api
- Base URL:
https://api.explorium.ai
Fetch, market-size (stats), and enrich people records across 800M+ prospects filtered by job level, department, title, or employer. Single and bulk enrichment endpoints return verified contact information, professional profiles and work history, and LinkedIn posts for a matched prospect_id.
- Human URL: https://developers.explorium.ai/reference/prospects_api
- Base URL:
https://api.explorium.ai
High-accuracy entity resolution. Resolve up to 50 companies to business_id values from name, domain, URL, or LinkedIn URL, and resolve people to prospect_id values from name plus company, email, or LinkedIn URL. Matching is the first step before fetch and enrichment.
- Human URL: https://developers.explorium.ai/reference/match_businesses
- Base URL:
https://api.explorium.ai
Fuzzy search over allowed filter values for businesses and prospects - industries, technologies, locations, job titles, departments - so clients can build valid filter payloads for fetch and stats calls.
- Human URL: https://developers.explorium.ai/reference/businesses_api
- Base URL:
https://api.explorium.ai
Real-time business and prospect signals - funding rounds, hiring surges, office moves, leadership changes, and job changes. Enroll businesses or prospects for monitoring, fetch events, and register webhooks that push notifications to an HTTPS endpoint.
- Human URL: https://developers.explorium.ai/reference/businesses_events
- Base URL:
https://api.explorium.ai
Native remote Model Context Protocol server exposing AgentSource data as 11 agent tools - match-business, fetch-businesses, fetch-businesses-statistics, fetch-businesses-events, enrich-business, match-prospects, fetch-prospects, fetch-prospects-statistics, fetch-prospects-events, enrich-prospects, and autocomplete. Available over streamable HTTP (https://mcp.explorium.ai/mcp) and SSE (https://mcp.explorium.ai/sse), and self-hostable via Docker (MIT). Works with Claude Desktop, Cursor, VS Code, n8n, and other MCP clients.
- Human URL: https://developers.explorium.ai/mcp-docs/agentsource-mcp
- Base URL:
https://mcp.explorium.ai/mcp - Source: https://github.com/explorium-ai/mcp-explorium
API key in the API_KEY request header, issued at https://admin.explorium.ai/api-key. See authentication/explorium-authentication.yml.
Explorium does not expose a documented public WebSocket API. Its real-time surfaces are poll-based event endpoints and outbound webhooks (plain HTTP), plus an MCP server over streamable-HTTP/SSE. See review.yml.
FN: Kin Lane Email: kin@apievangelist.com