# x402engine — Pay-per-call APIs for AI Agents

> x402engine — Pay-per-call APIs for AI Agents is a paid API for AI agents from x402engine.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

## Facts

- Endpoint: POST https://x402engine.app/api/search/web
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-search-web-1052fd63
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RNvTxMHRPYHzgofslXCli

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 api-search-web-1052fd63 -d '<json body>'
```

## How this service works

108 production APIs behind HTTP 402 micropayments. 72 LLMs, Kling V3 and Hailuo video generation, image generation, code execution, travel search, web scraping, TTS, and transaction simulation. Pay with USDC on Base, USDm on MegaETH, or USDC on Solana.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "bodyType",
    "body",
    "method"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "query"
     ],
     "properties": {
      "query": {
       "type": "string",
       "example": "latest ethereum news",
       "description": "Search query"
      },
      "category": {
       "type": "string",
       "example": "news",
       "description": "Content category filter (news, research paper, company, tweet, github, pdf)"
      },
      "numResults": {
       "type": "number",
       "default": 10,
       "example": 10,
       "description": "Number of results (1-30)"
      },
      "includeText": {
       "type": "boolean",
       "default": false,
       "description": "Include full page text in results"
      },
      "includeDomains": {
       "type": "array",
       "items": {
        "type": "string",
        "example": "arxiv.org"
       },
       "example": [
        "arxiv.org",
        "github.com"
       ],
       "description": "Only include results from these domains"
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-search-web-1052fd63/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402engine.app](https://www.zero.xyz/host/x402engine.app/llms.txt)