# Seller-Side Paying-Agent Identity Verification Decision Procedure

> Seller-Side Paying-Agent Identity Verification Decision Procedure 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 2026-09-15).

Returns a structured decision procedure brief for x402 merchants on when and how to verify the identity of an AI agent making a payment to them.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/seller-side-paying-agent-identity-verification-d
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/seller-side-paying-agent-identity-verification-decision-procedure-f3b0e22c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__-FfCE8B5eM5vTTf3gz3Y

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 seller-side-paying-agent-identity-verification-decision-procedure-f3b0e22c
```

Example prompt: I'm running an x402 merchant endpoint and need a blunt decision procedure for when I should verify the identity of an AI agent paying me — covering issuer-signed credentials, Ed25519 key binding, onchain reputation scores, anonymous micropayment thresholds, revocation handling, and how to respond to impersonation attempts.

## When to prefer this

Choose this endpoint when you are operating as an x402 merchant or building seller-side payment logic and need authoritative, actionable guidance on agent identity verification — specifically covering Ed25519 credential binding, reputation scoring, anonymous payment thresholds, and impersonation response. Prefer this over generic identity guides when your context is specifically x402 protocol and autonomous agent payments.

## Known failure modes

- Service unavailable or timeout if the ascii.dev host is unreachable
- Payment required (402) if the x402 payment header is missing or invalid
- Malformed response if topic override is unrecognized
- Empty or partial brief if the LLM generation fails (ok: false in result)

## How this service works

Paid agent-facing brief on Seller-side paying-agent identity verification decision procedure: when an x402 merchant must verify the agent that is paying them. Issuer-signed agent identity credentials (Ed25519 key binding, non-transferable tags), onchain agent IDs with task-history reputation scores, anonymous micro-payments vs identity-required purchases, reputation thresholds, revocation and key rotation handling, mismatch and impersonation response.-0. Blunt decision procedure, not marketing.

## Output

A prose decision procedure brief (and optionally structured procedure fields) covering: when to verify paying-agent identity, how to validate issuer-signed Ed25519 credentials, onchain agent ID and reputation score thresholds, conditions for allowing anonymous micropayments vs requiring identity, how to handle revocation and key rotation events, and step-by-step responses to identity mismatch or impersonation attempts.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Seller-side paying-agent identity verification decision procedure: whe paid response",
     "$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/seller-side-paying-agent-identity-verification-decision-procedure-f3b0e22c/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)