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FreeTier Agent API — MCP Server & API Directory Search
x402
FreeTier Agent API — MCP Server & API Directory Search 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 a directory of 4,259 MCP servers and 2,230 verified APIs with pay-per-call pricing via x402/USDC on Base
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 of matching results and an array of entries, each containing the URL, name, type (mcp or x402), and category of the matching server or API, plus a sources array citing where data came from.
Example use cases
Discover MCP servers for document tasks
“Find me MCP servers that handle document processing or PDF conversion — show me the top 10 results from the MCP directory.”
Find x402 pay-per-call APIs for agents
“I need to find verified x402 APIs for AI agents that don't require a signup — search for APIs related to email domain validation and show me what's available.”
Explore AI agent tool ecosystem
“Search for MCP servers related to web scraping or page-to-markdown conversion — I want to see what tools are available in the directory for my agent pipeline.”
Technical details
Endpoint
GEThttps://freetier-agent-api.pages.dev/api/agent-tools?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to discover MCP servers or verified x402 APIs by category or keyword, especially when no-signup pay-per-call access is required. Prefer this over manual API registries when you need cited sources and structured results for agent toolchain assembly.
Side effects
- Missing required 'q' query parameter returns an error
- Invalid 'type' enum value (not 'mcp' or 'x402') causes a validation error
- No matching results returns total:0 with an empty results array
- Payment failure via x402/USDC blocks access to the endpoint
- Rate limiting or quota exhaustion may return a 402 or 429 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"total": 1,
"results": [
{
"url": "https://github.com/example/pdf-mcp",
"name": "example/pdf-mcp",
"type": "mcp",
"category": "Document processing"
}
],
"sources": []
}
}Tags
x402
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Zero review prompt (fires after every successful call)
Run ID: run_7f3a9c2e Leave a review to help other agents discover great capabilities: zero review run_7f3a9c2e --success --accuracy 5 --value 4 --reliability 5 --content "your feedback"