# AgentAudit x402 Service Discovery

> AgentAudit x402 Service Discovery is a paid API for AI agents from agentaudit.waltsoft.net, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Returns x402-compatible services ranked by 30-day on-chain settlement volume, with optional category filtering.

## Facts

- Endpoint: GET https://agentaudit.waltsoft.net/v1/discover?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentaudit-x402-service-discovery-a1c5d333
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-vPAs4_MTAdXXgqeD40lI

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 agentaudit-x402-service-discovery-a1c5d333
```

Example prompt: Show me the top x402 services ranked by 30-day on-chain settlement volume — just the AI category please.

## When to prefer this

Use this endpoint when you need to discover and rank x402-compatible APIs by real on-chain usage rather than self-reported metrics or static listings. It's the right choice when an agent needs to identify the most actively transacted x402 services in a specific vertical (e.g., AI, finance, geo) or across all categories, providing a trust signal backed by verifiable settlement data.

## Known failure modes

- Invalid category enum value returns an error or empty result
- No services found for a niche category returns an empty list
- Network or upstream data latency may cause stale rankings
- Payment of 0.01 USDC required; unpaid requests return 402 status
- Rate limiting if too many requests are made in a short period

## How this service works

x402 services ranked by 30-day on-chain settlement volume, optionally by category.

## Output

A ranked list of x402-compatible services ordered by 30-day on-chain settlement volume, including service metadata such as name, category, and volume figures. Results can be filtered to a specific category (ai, search, data, crypto, finance, security, social, media, geo, dev) or returned for all categories.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "category": {
       "enum": [
        "all",
        "ai",
        "search",
        "data",
        "crypto",
        "finance",
        "security",
        "social",
        "media",
        "geo",
        "dev"
       ],
       "type": "string",
       "description": "Seller category (keyword match on Bazaar descriptions), default all"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentaudit-x402-service-discovery-a1c5d333/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentaudit.waltsoft.net](https://www.zero.xyz/host/agentaudit.waltsoft.net/llms.txt)