# KYA Brasil – Verified Agent Credential Retrieval (Signed)

> KYA Brasil – Verified Agent Credential Retrieval (Signed) is a paid API for AI agents from kya-br-agents.marcelfons.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-27).

Retrieves a signed, timestamped verification receipt confirming a Brazilian AI agent's KYC/compliance status, with no daily rate limit.

## Facts

- Endpoint: GET https://kya-br-agents.marcelfons.workers.dev/v1/agents/:id/verified?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-27
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kya-brasil-verified-agent-credential-retrieval-signed-dbb486b5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_z7OXNO4vjSghWp8vnmoGC

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability kya-brasil-verified-agent-credential-retrieval-signed-dbb486b5
```

Example prompt: Fetch the signed verification receipt for my registered Brazilian AI agent with credential ID 'agnt_abc123' — I need the timestamped proof of what was checked and when.

## When to prefer this

Choose this endpoint over the free verification endpoint when you need an auditable, signed receipt of the verification — for example, for compliance documentation, audit trails, or to prove at a specific point in time that an agent was verified. Also prefer this when you need unlimited calls without hitting a daily rate limit. If you only need a quick status check with no receipt, the free tier may suffice.

## Known failure modes

- Invalid or unknown credential ID returns a 404 not found error
- Expired credential may return a non-verified status requiring renewal via the re-issue endpoint
- Payment of $0.01 USDC not completed results in a 402 Payment Required response
- Malformed path parameter returns a 400 bad request
- Network or worker-side error returns a 500 response

## How this service works

Same as the free verification, without daily limit, plus a signed receipt of the verification itself (what was checked, when). Pay per call with x402.

## Output

A signed verification receipt documenting which fields were checked (e.g. CNPJ, agent key, company), the timestamp of the verification, and the current verified status of the agent — returned as a cryptographically signed object that can be stored as an audit artifact.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "id"
     ],
     "properties": {
      "id": {
       "type": "string",
       "description": "credential_id returned by POST /v1/agents"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kya-brasil-verified-agent-credential-retrieval-signed-dbb486b5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kya-br-agents.marcelfons.workers.dev](https://www.zero.xyz/host/kya-br-agents.marcelfons.workers.dev/llms.txt)