# x402 Bazaar Search — GPT-5.5 Gateway

> x402 Bazaar Search — GPT-5.5 Gateway is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).

Searches the x402 bazaar index for available AI tool endpoints matching a query, returning live-priced resource listings with USDC pricing on Base.

## Facts

- Endpoint: GET https://gpt55.558686.xyz/v1/tools/x402-bazaar-search
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-bazaar-search-gpt-5-5-gateway-85e9002d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8lrRdpepmlktpT21jjCjD

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 x402-bazaar-search-gpt-5-5-gateway-85e9002d
```

Example prompt: Search the x402 bazaar for 'gpt-5.5' endpoints, include live prices, and return up to 5 results so I can see what's currently available and how much each one costs in USDC.

## When to prefer this

Use this endpoint when an AI agent needs to programmatically discover available x402-protocol API endpoints — especially for finding GPT-5.5 or other LLM tools available on the Base network with per-call USDC pricing. Prefer this over a general web search when you need structured, machine-readable pricing and endpoint metadata from the x402 bazaar index specifically.

## Known failure modes

- Missing required 'query' parameter returns validation error
- Query string exceeds 120 characters causes schema rejection
- Limit outside 1–20 range is rejected
- timeout_ms outside 1000–12000 range is rejected
- No matching resources returns empty resources array with returnedCount 0
- x402 payment failure if USDC balance insufficient for the $0.004 call fee
- Live price discovery timeout may return stale prices instead

## How this service works

Query the CDP x402 Bazaar discovery API, normalize paid resources, surface resource URL, service name, tags, scheme, network, payTo, and minimum USDC price. This deterministic endpoint does not call an upstream model. GET variant for agents, crawlers, and wallets that prefer query parameters over a JSON body. Pay up to $0.004 per request with x402 USDC on Base.

## Output

Returns a JSON object with ok status, the tool name, the search query, an array of matching resources (each with network ID, resource URL, live pricing details, min price, effective price, and price source), plus summary counts for total returned, stale prices, live-cheaper entries, and matched payTo addresses.

## 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"
    },
    "pathParams": {
     "type": "object",
     "additionalProperties": true
    },
    "queryParams": {
     "type": "object",
     "required": [
      "query"
     ],
     "properties": {
      "sort": {
       "enum": [
        "relevance",
        "price",
        "activity"
       ],
       "type": "string"
      },
      "limit": {
       "type": "integer",
       "maximum": 20,
       "minimum": 1
      },
      "payTo": {
       "type": "string",
       "maxLength": 80,
       "minLength": 1
      },
      "query": {
       "type": "string",
       "maxLength": 120,
       "minLength": 1
      },
      "pay_to": {
       "type": "string",
       "maxLength": 80,
       "minLength": 1
      },
      "timeout_ms": {
       "type": "integer",
       "maximum": 12000,
       "minimum": 1000
      },
      "include_all": {
       "type": "boolean"
      },
      "include_live_prices": {
       "type": "boolean"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "tool": {
       "type": "string"
      },
      "fetchedAt": {
       "type": "string"
      }
     },
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-bazaar-search-gpt-5-5-gateway-85e9002d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gpt55.558686.xyz](https://www.zero.xyz/host/gpt55.558686.xyz/llms.txt)