# FMCSA Carrier Intelligence

> Pay-per-call US motor carrier safety, authority and identity-linkage data built from FMCSA public records, for AI agents. MCP, A2A and plain HTTP endpoints; paid in USDC on Solana, Base or Polygon via x402 v2; no account needed (or a prepaid API key). Charged only when a call returns records.

Operated by 4SAKE Agent Co. Not affiliated with or endorsed by FMCSA or the US DOT. The data describes regulated motor carriers as business entities and is not a consumer report. It must not be used as a factor in any individual's eligibility for credit, insurance, employment or housing (see Terms).

## Docs

- [API documentation](https://carriers.4sakeco.com/docs/): curl examples for every endpoint, API-key authentication, errors, rate limits
- [Pricing](https://carriers.4sakeco.com/pricing/): price per call for every tool, charged only when a call returns records
- [Run a check](https://carriers.4sakeco.com/check/): browser page for key holders: carrier selection record, broker authority check, inspection and crash summary
- [Free MC to USDOT lookup](https://carriers.4sakeco.com/lookup/): browser page for the free lookup and identity screen
- [For agents](https://carriers.4sakeco.com/for-agents/): endpoints, x402 payment flow, prices, billable-event rule, rate limits, error codes, examples
- [Skill](https://carriers.4sakeco.com/SKILL.md): when and how to use each tool
- [Request a free evaluation API key](https://carriers.4sakeco.com/request-key/): $5 of credit, for people without a crypto wallet; reviewed by hand
- [After Montgomery: what a carrier-selection file should show](https://carriers.4sakeco.com/guides/after-montgomery/)
- [Guides index](https://carriers.4sakeco.com/guides/)
- [How to find a USDOT number from an MC number](https://carriers.4sakeco.com/guides/mc-number-to-usdot-number/)
- [Chameleon carriers: what they are and how to check for one](https://carriers.4sakeco.com/guides/chameleon-carriers/)
- [FMCSA stopped updating authority and insurance files on 2026-05-14](https://carriers.4sakeco.com/guides/fmcsa-data-freeze/)
- [Carrier vetting API quickstart](https://carriers.4sakeco.com/guides/carrier-vetting-api/)
- [Terms of Service](https://carriers.4sakeco.com/terms/)
- [Privacy Policy](https://carriers.4sakeco.com/privacy/)

## Endpoints

- MCP (streamable HTTP): https://fmcsa-mcp-843680657471.us-central1.run.app/mcp
- Verify a carrier selection record (free): https://fmcsa-mcp-843680657471.us-central1.run.app/verify/<hash>
- A2A Agent Card: https://fmcsa-a2a-843680657471.us-central1.run.app/.well-known/agent-card.json
- Plain HTTP (x402), one route per tool: https://fmcsa-mcp-843680657471.us-central1.run.app/x402/<tool> (OpenAPI: https://fmcsa-mcp-843680657471.us-central1.run.app/openapi.json)