US Federal Register
The Daily Journal of the United States Government (federalregister.gov API). Public domain.
- cost
- Free every endpoint, within the daily allowance
- after that
- from $0.001 / call · card or USDC
- endpoints
- 4
No signup needed over MCP: 50 free calls a day, or 500 with a free key.
Search documents Free
Rules, proposed rules, notices and presidential documents matching a term.
- cost
- Free then $0.003 / call
- MCP tool
- federal-register__search
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.003 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/federal-register/search
| Param | Type | Description |
|---|---|---|
| q | string | Search term |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/federal-register/search?q=artificial%20intelligence" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/federal-register/search?q=artificial%20intelligence"
by fourzerotwo
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Document Free
One Federal Register document by document number.
- cost
- Free then $0.002 / call
- MCP tool
- federal-register__document
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/federal-register/document
| Param | Type | Description |
|---|---|---|
| number | string | Document number |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/federal-register/document?number=2025-02172" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/federal-register/document?number=2025-02172"
by fourzerotwo
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Public inspection today Free
Documents on public inspection ahead of publication.
- cost
- Free then $0.002 / call
- MCP tool
- federal-register__public-inspection
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/federal-register/public-inspection
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/federal-register/public-inspection" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/federal-register/public-inspection"
by fourzerotwo
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Agencies Free
Every federal agency that publishes in the Register.
- cost
- Free then $0.001 / call
- MCP tool
- federal-register__agencies
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/federal-register/agencies
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/federal-register/agencies" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/federal-register/agencies"
by fourzerotwo
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Source: Office of the Federal Register via federalregister.gov. Public domain.