# Usaref (usaref.dev)

Serves US government reference data over an API, with each value linked to its official source and effective date.

- Atlas card: https://inite.ai/en/atlas/usaref.dev
- Site: https://usaref.dev
- For: developers and AI agents needing cited North American government rates and figures via API
- Categories: dev
- Use 0/100 · alive 100/100

## Used for

- look up current policy rate and inflation for a country
- validate tax ID and VAT number formats offline
- calculate VAT net and gross amounts

## Price

- from 10 USD/one-time (read 2026-10-20 on https://usaref.dev/pricing)

## For developers

- OpenAPI: https://usaref.dev/openapi.json (43 paths)
- MCP server: dev.usaref/reference-data (namespace; open on 2026-10-20, 32 tools)
- Status page: https://usaref.dev/status
- Read 2026-10-20

## MCP server, measured daily

Server: https://usaref.dev/mcp, checked every day since 2026-10-20 (1 checks).

- Answered: measuring, 1 daily checks so far
- Median first answer: 1220 ms
- Sign-in: none
- Context its tool definitions take: about 12306 tokens (32 tools)
- Tool definitions: A, 99/100
- Failing "params_described": 1 of 32 tools
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-20

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Source: INITE Atlas, https://inite.ai/en/atlas/usaref.dev. JSON: https://inite.ai/api/atlas/usaref.dev. MCP: https://inite.ai/api/mcp (atlas_lookup).