# Fluxx Open Exchange

> Free, read-only public grant data for AI assistants and agents: 1.8M US nonprofits and funders, 30.1M grants made, 5M IRS 990 financial records, and open federal + state funding opportunities, with the opportunities published on the CommonGrants open standard. No signup, no API key.

## Connect
- MCP endpoint (Streamable HTTP, no auth): https://open.fluxx.io/mcp
- CommonGrants Publisher API base URL: https://open.fluxx.io  (GET /common-grants/opportunities, GET /common-grants/opportunities/{id}, POST /common-grants/opportunities/search)
- OpenAPI: https://open.fluxx.io/openapi.json
- Discovery manifest: https://open.fluxx.io/.well-known/mcp.json

## Tools
list_grant_sources, search_opportunities, get_opportunity, search_organizations, get_organization, get_organization_financials, get_funder_profile, search_awards, check_nonprofit_status, find_similar_organizations, get_organization_people, get_organization_programs, get_organization_stats, list_ntee_codes, list_jurisdictions, mission, get_involved, share_this, report_data_issue

## Numbers and what they mean
- Live counts per register (record_count, open_now, forecasted, last_refreshed_at, counts_basis, counted_at): https://open.fluxx.io/sources
- Definitions, exact rules, exclusions and caveats for every figure: https://open.fluxx.io/definitions.json (markdown: https://open.fluxx.io/definitions)
- Provenance and legal basis of every source (publisher, terms, attribution, review status): https://open.fluxx.io/sources/register (JSON: https://open.fluxx.io/sources/register.json); every /sources row carries the same provenance block
- Everything on one page for agents: https://open.fluxx.io/llms-full.txt

## Rules
- Fair use: 60/min, 5000/day per client; page size ≤ 25. https://open.fluxx.io/fair-use
- Records are as filed; never an eligibility or tax-status determination. Cite source and asOf.
- Privacy / transparency note: https://open.fluxx.io/privacy