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FreeTier Agent API — x402 Services Directory
x402
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
Price / call$0.001
Success—
StatusUnknown
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.
Example use cases
Discover cheap verified data APIs
“Find me all verified x402 APIs under $0.02 on Base that deal with country or holiday lookups — I want something my agent can call without signing up.”
Find MCP servers for AI tooling
“Search the x402 services directory for MCP servers — I'm building an AI agent and need to know what's available, preferably verified ones.”
Locate email domain check APIs
“Can you look up x402 APIs in the email or domain category? I need a pay-per-call option my agent can use to validate email domains without a subscription.”
Technical details
Endpoint
GEThttps://freetier-agent-api.pages.dev/api/x402-services?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"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": []
}
}Tags
x402
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