# Agent Identity Credential Acceptance and Counterparty Verification Procedure

> Agent Identity Credential Acceptance and Counterparty Verification 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 deterministic decision procedure brief for verifying issuer-signed agent identity credentials and identity tags before an agent transacts, covering issuer trust, key binding, non-transferability, revocation, expiry, and scope binding.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/agent-identity-credential-acceptance-and-counter
- 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/agent-identity-credential-acceptance-and-counterparty-verification-0bc9f67a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QwON_A5vJIB6_Pl3hg39y

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-identity-credential-acceptance-and-counterparty-verification-0bc9f67a
```

Example prompt: Before I proceed with this x402 transaction, walk me through the full agent identity credential verification procedure — I need to check issuer trust, key binding proof of possession, non-transferability, and whether this credential is still valid and within its authorized scope.

## When to prefer this

Choose this endpoint when an agent needs a structured, paid-grade decision procedure for evaluating agent identity credentials or identity tags in the context of x402 payments or agentic transactions — specifically when you need coverage of issuer trust, key binding, non-transferability, revocation, expiry, and scope binding in a single authoritative brief. Prefer it over general identity libraries when operating in agentic payment rails where credential forgery, reuse, or scope overreach are live risks.

## Known failure modes

- Missing or malformed 'input' object returns a schema validation error
- Invalid method enum value (e.g. POST) results in rejection
- Expired or invalid x402 payment header causes 402 response requiring fresh payment
- Topic override not matching any known procedure may return a generic or degraded brief
- LLM or reasoning backend unavailability may delay or fail generation

## How this service works

Deterministic gate for an agent presented with an issuer-signed agent identity credential or identity tag before transacting. Ordered checks: issuer trust (who signed, verification key published, issuer linked to rail or facilitator), key binding via proof of possession against the session signing key, non-transferability (no reuse across agents, resale signals forgery), revocation and expiry checked before and at settlement, scope binding (a tag asserts identity, not payment authority), and

## Output

A structured JSON response containing a prose decision procedure brief ('brief') for agents outlining ordered verification steps, the topic matched, a generation source indicator (llm, reasoning, or deterministic), an ISO-8601 timestamp, service slug, and payment confirmation metadata. The 'ok' field indicates handler success.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Agent identity credential acceptance and counterparty verification procedure paid response",
     "$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-identity-credential-acceptance-and-counterparty-verification-0bc9f67a/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)