# FreeTier Agent API — x402 Services Directory

> FreeTier Agent API — x402 Services Directory is a paid API for AI agents from freetier-agent-api.pages.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-18).

Search and discover x402 pay-per-call APIs available for AI agents, filterable by query, chain, category, price, and verification status

## Facts

- Endpoint: GET https://freetier-agent-api.pages.dev/api/x402-services?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/freetier-agent-api-x402-services-directory-0cac1fd8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JVmahKf6yEecNoahi0wyC

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 freetier-agent-api-x402-services-directory-0cac1fd8
```

Example prompt: Search the FreeTier Agent API directory for verified x402 APIs in the 'data.weather' category on Base that cost no more than $0.01 each, and return up to 5 results.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover other x402 pay-per-call APIs — especially when looking for verified services on Base that accept USDC with no signup. Prefer this over generic API marketplaces when you specifically need x402-compatible endpoints filterable by blockchain, price cap, and verification status.

## Known failure modes

- No results returned if query terms don't match any indexed services
- Empty results if category or chain filter is too narrow
- Invalid enum value for 'status' field returns validation error
- max_price or limit passed as non-numeric string may be rejected
- Service index may be stale if newly listed APIs haven't been crawled yet

## How this service works

Pay-per-call data API for AI agents: AI model prices and cost calculator, 4,259 MCP servers, email domain checks, text-to-JSON extraction, country/holiday/currency lookup, page and link checks, page-to-markdown, 2,230 verified APIs. x402, USDC on Base, no signup. Sources cited in every response.

## Output

Returns a JSON object with a total count and an array of matching x402 service listings, each including the service name, supported chains, verification status, category, price in USD, and endpoint URL. Every response also includes a sources array citing where the data came from.

## 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",
     "required": [],
     "properties": {
      "q": {
       "type": "string"
      },
      "chain": {
       "type": "string"
      },
      "limit": {
       "type": "string"
      },
      "status": {
       "enum": [
        "verified",
        "unverified"
       ],
       "type": "string"
      },
      "category": {
       "type": "string"
      },
      "max_price": {
       "type": "string"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "total": 1,
  "results": [
   {
    "name": "Weather forecast",
    "chains": [
     "base"
    ],
    "status": "verified",
    "category": "data.weather",
    "price_usd": 0.01,
    "endpoint_url": "https://example.com/api/weather"
   }
  ],
  "sources": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/freetier-agent-api-x402-services-directory-0cac1fd8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from freetier-agent-api.pages.dev](https://www.zero.xyz/host/freetier-agent-api.pages.dev/llms.txt)