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EIN Format Check
x402
EIN Format Check is a paid API for AI agents from hcrb.in, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).
Validates the format of a US Employer Identification Number (EIN) using offline deterministic rules, returning validity, reason, and normalized form.
Price / call$0.005
Success—
StatusUnknown
How this service works
Offline deterministic checks (no ML, no scraping) for business identifiers and rental due-diligence, paid per call via x402 (gasless EIP-3009 USDC on Base). Checksum-verifiable (IBAN, LEI, VAT, ABA, ISBN, SEDOL…) vs format-only (EIN, IFSC, SWIFT/BIC…) — every response returns a scope field. Non-custodial, signed receipts. First 3 calls/day free.
Output
A JSON object with a boolean 'valid' field, a human-readable 'reason' explaining the result, a 'scope' field indicating whether the check is format-only or checksum-verifiable, a 'normalized' string with the standardized EIN format, and a 'country' field. EIN is a format-only check (no checksum), so 'scope' will reflect that.
Example use cases
Pre-filing EIN validation for payroll
“Before I submit payroll taxes, check that this EIN is correctly formatted: 98-7654321.”
Onboarding vendor identity check
“We're onboarding a new vendor who gave us their EIN as 00-1234567 — can you verify that's a valid EIN format?”
Bulk data cleanup for business registry
“I have an EIN from an old database record — '123456789' — can you tell me if it's a valid format and what the normalized version looks like?”
Technical details
Endpoint
POSThttps://hcrb.in/v1/tools/ein-format-check/call?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, offline, deterministic EIN format check with no external lookups or ML — ideal for agent pipelines doing KYB onboarding, tax form validation, or data cleanup where low latency and auditability (signed receipts) matter. It is not a registry lookup and will not confirm the EIN belongs to a real business.
Side effects
- Malformed or missing input returns valid:false with a descriptive reason
- Non-EIN identifier submitted returns an error or invalid result
- Payment failure via x402 results in HTTP 402 before processing
- Rate limit exceeded beyond 3 free daily calls without payment
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object |
Output
Schema · Response
{
"type": "json",
"schema": {
"type": "object",
"required": [
"valid",
"reason"
],
"properties": {
"tool": {
"type": "string"
},
"scope": {
"type": "string"
},
"valid": {
"type": "boolean"
},
"reason": {
"type": "string"
},
"country": {
"type": "string"
},
"normalized": {
"type": "string"
}
}
},
"example": {
"valid": true,
"reason": "checksum valid"
}
}Tags
x402
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