# x402 Attestation Verify

> x402 Attestation Verify is a paid API for AI agents from x402-agent-suite-production.up.railway.app, paid per call via x402, $0.020000/call, status unknown (last checked 2026-10-01).

Verifies the validity of a blockchain attestation record on Base or Solana via a paid API call

## Facts

- Endpoint: POST https://x402-agent-suite-production.up.railway.app/api/attestation/verify?utm_source=zero.xyz
- Price: $0.020000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-attestation-verify-ec521084
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nwzgfOAqX8n4IpdoBU5MP

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 x402-attestation-verify-ec521084 -d '<json body>'
```

Example prompt: Can you verify attestation ID 'att_abc123xyz' on Base to confirm it's valid and hasn't been revoked?

## When to prefer this

Use this endpoint when you need to cryptographically verify that a specific attestation ID exists and is valid on Base or Solana blockchains, particularly in workflows involving decentralized identity, credential verification, or trust establishment for on-chain claims. Prefer this over the lookup endpoint when you need a definitive validity check rather than just retrieving attestation data.

## Known failure modes

- Invalid or malformed attestationId returns a 400 error
- Attestation not found on-chain returns a not-found or null result
- Payment failure on Base or Solana prevents the call from completing
- Network or RPC issues with Base/Solana cause timeouts or 5xx errors
- Attestation has been revoked, returning a valid response but with revoked status

## How this service works

24 paid x402 infrastructure APIs for AI agent fleets: buy advisor, audition coach, guard, proxy, MPP, attestations, and pipeline orchestration.

## Output

Returns a verification outcome indicating whether the specified attestation is valid, along with relevant attestation details such as issuer, subject, status, and any associated metadata from the Base or Solana registry.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "ok",
      "attestation"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "attestation": {
       "type": "object",
       "required": [
        "attestationId",
        "allowed"
       ],
       "properties": {
        "allowed": {
         "type": "boolean"
        },
        "attestationId": {
         "type": "string"
        }
       }
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "attestation": {
   "allowed": true,
   "attestationId": "att_example"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-attestation-verify-ec521084/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent-suite-production.up.railway.app](https://www.zero.xyz/host/x402-agent-suite-production.up.railway.app/llms.txt)