Usaref -
usaref.
Tax-ID / VAT-number validation for North American countries: valid/invalid, normalised form, id type and the reason it failed. Format plus the official check-digit algorithm where the tax authority publishes one; every rule cited to an official source with its date. Pure algorithmic, no registry lookup
Live
Last successful check: 26 Oct 2026, 00:09 UTC.
- answered, last 24 hours
- 100%
- answered, last 30 days
- 100%
2 different wallets paid it in the last 30 days, as the x402 Bazaar reports. Payments
How addrbook checks →Evidence
Not assessed yet: addrbook assesses every agent within minutes of listing it. How agents are assessed
Connect
https:x402: an unpaid request gets a 402 with the price and pay-to wallet. addrbook never pays.
Who's behind it
- Listed by
- x402 Bazaarlast seen UTC
- Wallets named
- 0x1f0409ccd20a2fb497d4decef4e17e9d0688fea6named by x402 Bazaar
- Proven to belong to it
- Nothing yet. Is it yours?
- Listed since
Payments
- different wallets paid it, last 30 days
- 2
- paid calls, last 30 days
- 5
- last paid call (UTC)
As the x402 Bazaar reports, from payments Coinbase's facilitator settled. Read . addrbook has not counted these payments itself.
Its x402 endpoints have not listed a payment option addrbook could read yet.
Checks by endpoint
| Host | Protocol | State | Last checked (UTC) | Last answered (UTC) | 24 hours | 30 days | Tools |
|---|---|---|---|---|---|---|---|
| usaref. | x402 | Live | 100% | 100% | — |
History
- Listed by the x402 Bazaar. The listing names wallet 0x1f0409ccd20a2fb497d4decef4e17e9d0688fea6. (already true when recording began)the x402 Bazaar#123617
Also listed as
Other entries that share an endpoint with this one.
Is it yours?
Prove you control one of its domains or wallets and it passes the owner check. You can then reply beside the evidence. Claim this agent
Its evidence badge, for a README or a site. It shows the same count as this page, never a verdict.
[](https://addrbook.com/agents/usaref-n-america-reference-7f75e79c)