# Agent Payment Claim Authorization Attestation: Verify Spender Authorization

> Agent Payment Claim Authorization Attestation: Verify Spender Authorization is a paid API for AI agents from k2so-8080.on.ascii.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-20).

Returns a structured decision procedure for verifying x402 payment claim spender authorization — including policy, delegation, and budget cap checks — before honoring a payment claim, independent of settlement proof.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/agent-payment-claim-authorization-attestation-ve?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-payment-claim-authorization-attestation-verify-spender-84d21fb9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZNO2gGPeRpri9Drm2tfl-

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 agent-payment-claim-authorization-attestation-verify-spender-84d21fb9
```

Example prompt: Give me the step-by-step decision procedure for verifying that an x402 payment claim's spender is actually authorized — checking their policy, delegation chain, and budget cap — before I honor the claim, separate from any settlement proof.

## When to prefer this

Use this endpoint when an agent needs a concrete, blunt decision procedure specifically for verifying x402 payment claim spender authorization (policy, delegation, budget cap) as a separate gate from settlement proof — not for general x402 payment safety checks, merchant endpoint vetting, or rail selection. Choose this over generic payment validation resources when you need a structured, agent-consumable authorization attestation workflow.

## Known failure modes

- Payment not made — endpoint returns 402 requiring $0.002 USDC before delivering the paid brief
- Missing or invalid query parameters result in default topic being used
- LLM generation failure may return ok:false in the result object
- Stale or cached generation may not reflect latest x402 protocol updates

## How this service works

Paid agent-facing brief on agent payment claim authorization attestation: verify spender authorization (policy, delegation, budget cap) separately from settlement proof before honoring a received x402 payment claim · Build a decision procedure or schema for: agent payment claim authorization attestation: verify spender authorization (policy, delegation, budget cap) separately from settlement proof before honoring a received-0. Blunt decision procedure, not marketing.

## Output

A paid LLM-generated decision procedure (prose and/or schema) detailing how an agent should verify spender authorization for a received x402 payment claim, covering: policy evaluation, delegation chain validation, budget cap checks, and how to perform these independently from settlement proof verification. Includes metadata such as generation source, model used, timestamp, and service slug.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "agent payment claim authorization attestation: verify spender authoriz paid response",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "required": [
      "ok",
      "paid",
      "service",
      "provider",
      "result"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "paid": {
       "type": "boolean"
      },
      "result": {
       "type": "object",
       "required": [
        "ok",
        "service"
       ],
       "properties": {
        "ok": {
         "type": "boolean",
         "description": "Handler success"
        },
        "brief": {
         "type": "string",
         "description": "Decision procedure prose for agents"
        },
        "model": {
         "type": "string"
        },
        "topic": {
         "type": "string"
        },
        "service": {
         "type": "string",
         "description": "Service slug"
        },
        "procedure": {
         "type": "string"
        },
        "generatedAt": {
         "type": "string",
         "description": "ISO-8601 timestamp"
        },
        "generationSource": {
         "enum": [
          "llm",
          "reasoning",
          "deterministic"
         ],
         "type": "string"
        }
       }
      },
      "payment": {
       "type": "object",
       "properties": {
        "code": {
         "type": "string"
        },
        "payer": {
         "type": "string"
        },
        "detail": {
         
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-payment-claim-authorization-attestation-verify-spender-84d21fb9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so-8080.on.ascii.dev](https://www.zero.xyz/host/k2so-8080.on.ascii.dev/llms.txt)