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KYA Brasil Agent Registration
x402
KYA Brasil Agent Registration is a paid API for AI agents from kya-br-agents.marcelfons.workers.dev, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-31).
Registers an AI agent to act on behalf of a Brazilian company (CNPJ) by issuing a signed challenge that the agent and the company's e-CNPJ must countersign to produce a verifiable credential.
Price / call$0.25
Success—
StatusUnknown
How this service works
Register an AI agent for a Brazilian company: agent key (EVM address or Web Bot Auth Ed25519 key), CNPJ and a mandate (JSON, validated against /.well-known/kya-mandate.schema.json). Returns a one-time challenge the agent signs with its key and the company signs with its e-CNPJ (CMS/PKCS#7). Price covers the checks at issuance.
Output
Returns a one-time challenge object that must be signed by both the agent using its registered key (EVM private key or Ed25519 key) and by the Brazilian company using its e-CNPJ certificate (CMS/PKCS#7 format) to complete registration and obtain a verifiable KYA credential.
Example use cases
Onboard payment automation agent
“I need to register our payment automation agent — its EVM address is 0xDe4...F9a — to act on behalf of our São Paulo company with CNPJ 45.678.901/0001-55. Its mandate allows it to approve supplier payments up to R$50,000. Give me the challenge so we can sign it with our e-CNPJ.”
Register compliance monitoring bot
“Register our compliance monitoring bot using its Ed25519 web-bot-auth public key for Brazilian entity CNPJ 98.765.432/0001-11. The mandate restricts it to read-only reporting actions. I need the one-time challenge returned so our legal team can sign it with the company e-CNPJ certificate.”
Bind ERC-8004 agent to CNPJ
“We have an ERC-8004 agent on chain eip155:1 with identity registry 0xReg...001 and agent ID 42 that we want to bind to our Brazilian holding company CNPJ 33.222.111/0001-88 under a mandate that covers procurement actions up to R$20,000 — start the KYA registration and return the signing challenge.”
Technical details
Endpoint
POSThttps://kya-br-agents.marcelfons.workers.dev/v1/agents?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to formally register an AI agent as an authorized representative of a Brazilian legal entity (CNPJ), producing a cryptographically verifiable credential signed by both the agent and the company's e-CNPJ. Prefer this over generic identity or KYC services when the use case specifically involves Brazilian companies (CNPJ-based identity) and AI agent mandates with defined action scopes validated against the KYA schema.
Side effects
- Invalid or unformatted CNPJ returns 400 with validation error
- Mandate JSON that does not conform to /.well-known/kya-mandate.schema.json returns 422 schema validation error
- Unrecognized agent kind or malformed agent ID returns 400
- Insufficient payment ($0.25 USDC not provided via x402) returns 402 Payment Required
- Duplicate registration attempt for same CNPJ+agent combination may return 409 conflict
- Network or Cloudflare Worker error returns 500
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| cnpj | string | |
| agent | object | {kind: 'evm' | 'web-bot-auth' | 'erc8004', id: address, base64url Ed25519 public key, or eip155:<chainId>:<identityRegistry>:<agentId>} |
| mandate | object | JSON validated by /.well-known/kya-mandate.schema.json |
Tags
x402
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