# Plinth US Grants Data

**Canonical:** https://apis.io/providers/plinth-us-grants-data/  
**Website:** https://data.useplinth.com/developers  
**APIs profiled:** 5

A JSON API over the entire US grantmaking universe — about 205,000 grantmaking foundations and 17.9 million grants, read from public IRS Form 990, 990-EZ and 990-PF e-file filings and the IRS Business Master File. The funder-grantee graph traverses in both directions: filter by funder_id for everything a foundation funded, or by recip_id for every funder behind a nonprofit. Offers REST endpoints for grants, organization profiles, an IRS compliance and OFAC screen, an ad-hoc read-only SQL endpoint over a 31-table warehouse, and a hosted OAuth 2.1 MCP connector for AI agents. Entity resolution is free and unmetered. Published by Plinth, trading name of Time to Spare Ltd (UK Companies House 11530023), which also operates plinth.org.uk in the UK.

## Kin Score — 62.3 / 100 (strong)

Scored 2026-08-17 under rubric 0.11.0.

| Facet | Score |
|---|---|
| Discoverability | 92.6 |
| Contract Quality | 59.0 |
| Governance | 52.1 |
| Operational Transparency | 10.5 |
| Developer Ergonomics | 65.2 |
| Commercial Clarity | 76.3 |

Regulatory layer — **Government & Public Sector**: 75.9 (matched via tags).

## Agent readiness — 60.4 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| MCP Server | yes |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | partial |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | yes |
| Well Known Catalog | yes |
| Consent Identity | yes |
| Agent Card | no |
| Dry Run Mode | no |

## APIs (5)

- **Plinth US Grants Data Analyze API** — Plain-English questions answered with SQL the service writes itself.
- **Plinth US Grants Data Grants API** — The funder-grantee graph: grants, funders, recipients and aggregates.
- **Plinth US Grants Data Organizations API** — Per-organization profiles, financials and IRS compliance facets.
- **Plinth US Grants Data Resolve API** — Turn an organization name into an EIN and a canonical URL. No key required.
- **Plinth US Grants Data SQL API** — Ad-hoc read-only SQL over the warehouse. Paid keys only.

## MCP servers (2)

- **mcp**
- **plinth-us-grants-data-mcp.yml**

## Security (3)

- **Plinth Us Grants Data Authentication** — apiKey/oauth2 · 2 schemes
- **Plinth Us Grants Data Domain Security** — TLSv1.3 · HSTS · DMARC
- **Plinth Us Grants Data Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Plinth Us Grants Data Plans Pricing**

## Tags

Philanthropy, Grants, Nonprofits, Foundations, IRS 990, Open Data, Government Spending, Research, Agents, REST, JSON, MCP, SQL

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/plinth-us-grants-data/). Scores are computed from the provider's own public artifacts under a published rubric.