# Pre-Wallet Merchant Endpoint Vetting for x402

> Pre-Wallet Merchant Endpoint Vetting for x402 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 an agent runs before funding a wallet or initiating a first x402/MPP payment, to verify a merchant endpoint's trustworthiness.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/pre-wallet-merchant-endpoint-vetting-for-x402-a?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/pre-wallet-merchant-endpoint-vetting-for-x402-41732ea6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NYYzR2Sn1ooV6TDdSivtO

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 pre-wallet-merchant-endpoint-vetting-for-x402-41732ea6
```

Example prompt: Before I fund the wallet and send that first x402 payment to this merchant, can you run through the full vetting procedure — checking challenge-header integrity, discovery doc, settlement terms, delivery contract evidence, and any kill criteria that should block me from proceeding?

## When to prefer this

Choose this endpoint when an AI agent needs a structured, actionable decision procedure specifically for vetting x402/MPP merchant endpoints before committing funds — especially when challenge-header integrity, discovery doc presence, settlement terms, and kill criteria are the primary concerns. Prefer over generic security audits or manual checklists when the context is autonomous agentic payment flows using the x402 protocol.

## Known failure modes

- Payment not made — returns 402 with payment instructions before delivering brief
- Invalid method (only GET/HEAD/DELETE accepted) — returns 405
- Merchant topic override not recognized — may return generic procedure
- LLM generation failure — result.ok may be false with no brief
- Network timeout on ascii.dev infrastructure — transient 5xx

## How this service works

Paid agent-facing brief on Pre-wallet merchant endpoint vetting for x402: a decision procedure an agent runs before funding a wallet or first payment, to verify a merchant's x402/MPP endpoint is trustworthy. Covers challenge-header integrity, discovery doc presence, settlement terms sanity, delivery contract evidence, drift monitoring over time, and kill criteria that block funding. · Build a decision procedure or schema fo-0. Blunt decision procedure, not marketing.

## Output

A paid prose brief containing a blunt, structured decision procedure including: challenge-header integrity checks, discovery document presence verification, settlement terms sanity assessment, delivery contract evidence evaluation, drift monitoring guidance over time, and explicit kill criteria that should block an agent from funding a wallet or proceeding with payment. Includes a boolean success flag, service slug, generation source, and ISO-8601 timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Pre-wallet merchant endpoint vetting for x402: a decision procedure an paid response",
     "$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/pre-wallet-merchant-endpoint-vetting-for-x402-41732ea6/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)