Frequently asked questions
How much does a call cost?
GET /v1/revalidation: 0.01 USDC. A fixed price per call, no account and no subscription.
How do I pay?
Through the x402 protocol, in USDC on eip155:8453. A call without payment gets a 402 answer carrying the requirements in the PAYMENT-REQUIRED header; the client signs the payment and retries with the PAYMENT-SIGNATURE header. x402 clients do this on their own.
What happens on an error?
Nothing is charged. Invalid input returns 400, an unreachable official source returns 503, and the payment is settled only after a successful answer.
Can I try it without paying?
Free trial: 3 calls per day on /v1/revalidation, on request only: add the query parameter free_trial=1 or the header X-Free-Trial: 1. Without that signal the route always answers 402. For an IPv6 address, the caller is its /64 block, and the addresses of one /48 block share at most 9 trial calls per day. The sample at https://revalidation.amacunia.fr/v1/exemple is a real answer, free.
How does an agent use it?
Through the MCP server at https://revalidation.amacunia.fr/mcp (streamable-http transport), or through the HTTP route described in https://revalidation.amacunia.fr/openapi.json and https://revalidation.amacunia.fr/llms.txt.
Where do the data and the rules come from?
Data: CMS Revalidation Due Date List (data.cms.gov, monthly), a U.S. Government work in the public domain; only the enrollment ID, NPI, state, enrollment type, provider type, specialty and the two due date fields are read, never a name; the enrollment ID is returned for organizations only, never for an individual practitioner. Rules: 42 CFR 424.515 and 424.540(a)(3), read on eCFR on 2026-11-11. The rules in detail: https://revalidation.amacunia.fr/rules.
Is this legal advice?
Information only, not legal advice; it does not replace a qualified attorney. Not affiliated with or endorsed by the Centers for Medicare & Medicaid Services (CMS), the U.S. Department of Health and Human Services or any U.S. government agency. Not a consumer report under the FCRA: do not use it to decide on employment, credit or insurance. The CMS Medicare Revalidation List tool is the authoritative record.
Information only, not legal advice; it does not replace a qualified attorney. Not affiliated with or endorsed by the Centers for Medicare & Medicaid Services (CMS), the U.S. Department of Health and Human Services or any U.S. government agency. Not a consumer report under the FCRA: do not use it to decide on employment, credit or insurance. The CMS Medicare Revalidation List tool is the authoritative record.
Sister services
- Biennial Update Sentinel: US motor carriers: MCS-150 biennial update deadline and enforcement status, by USDOT number.
- Operating Authority Sentinel: US motor carriers: operating authority, insurance on file and suspension notices, by USDOT number.
- Disaster Deadline Sentinel: US counties: disaster assistance application cutoff and IRS postponed tax date, by county FIPS.
- Sentinelle créances: France: creditor claim filing deadline after an insolvency notice (BODACC), by SIREN.
- Sentinelle oppositions: France: creditor objection deadline after a business sale or merger (BODACC), by SIREN.
- Sentinelle catnat: France: insurance claim deadline after a natural-disaster decree (CatNat), by commune.
- Sentinelle phyto: France: pesticide authorisation status and grace periods for sale and use (Anses E-Phy).
- Sentinelle syndic: France: condominium syndic and mandate end date, by condominium or by area.
Publisher: amacunia.fr · [email protected] · Terms of use · llms.txt · openapi.json · x402