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code402 CNPJ Check
x402
code402 CNPJ Check is a paid API for AI agents from hcrb.in, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).
Validates a Brazilian CNPJ (Cadastro Nacional da Pessoa Jurídica) business identifier using offline deterministic checksum verification, paid per call via x402 micropayments.
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
Returns a JSON object with a boolean 'valid' field, a 'reason' string explaining the outcome (e.g. 'checksum valid' or the specific failure), a 'scope' field indicating whether verification was checksum-level or format-only, a 'normalized' string with the standardized CNPJ format, and a 'country' field. Also echoes the 'tool' name used.
Example use cases
KYB check before onboarding Brazilian supplier
“Before we onboard this new supplier from Brazil, can you confirm their CNPJ 45.543.915/0001-02 is valid and correctly formatted?”
E-commerce checkout CNPJ validation
“A customer entered CNPJ 12.345.678/0001-95 at checkout — can you check whether that's a legitimate Brazilian business ID before we process the order?”
Rental due diligence on Brazilian tenant
“I'm reviewing a rental application from a Brazilian company that gave CNPJ 07.526.557/0001-00 — can you validate whether this business identifier is real and passes checksum?”
Technical details
Endpoint
POSThttps://hcrb.in/v1/tools/cnpj-check/call?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, offline, deterministic validation of a Brazilian CNPJ number with checksum verification — not just format checking. Ideal for KYB (Know Your Business) pipelines, supplier onboarding, rental due diligence, or any workflow where you need a cheap ($0.005), auditable, non-ML confirmation that a Brazilian business ID is structurally and mathematically valid. Prefer over scraping Brazilian government registries when offline verification suffices.
Side effects
- Invalid or malformed CNPJ input returns valid:false with a descriptive reason
- Network or payment failure if x402 USDC transaction cannot be processed
- Rate limit exceeded beyond 3 free daily calls without payment
- Ambiguous input (letters, wrong length) may return format error in reason field
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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