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FreeTier Agent API — MCP Server Directory Search
x402
FreeTier Agent API — MCP Server 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 and filter a directory of 4,259 MCP servers by query, category, scope, language, or official 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 count of matching MCP servers and an array of results, each containing the server name, URL, scope (cloud/local/embedded), category, and supported programming languages.
Example use cases
Discover database MCP servers
“Search the MCP server directory for any servers in the Databases category that support local scope — I want to self-host a database integration.”
Find official cloud MCP servers
“List me up to 20 official MCP servers that are cloud-hosted so I can pick one to integrate into my agent workflow.”
Search MCP servers by language
“Find MCP servers written in TypeScript — I want to see what's available so I can extend one for my project.”
Technical details
Endpoint
GEThttps://freetier-agent-api.pages.dev/api/mcp-servers?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an agent needs to discover or search MCP servers by category, language, or deployment scope from a curated directory of 4,259 entries. Prefer this over manual GitHub search or other MCP indexes when you need structured, filterable results with source citations and no signup required, paying only $0.02 USDC per call via x402.
Side effects
- Invalid scope enum value returns an error or empty results
- No results found for a very specific query combination
- Payment not received — endpoint returns HTTP 402 requiring USDC payment on Base
- Query string too broad returns too many results if limit not set
- Network timeout on Cloudflare Pages edge
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 1,
"results": [
{
"url": "https://github.com/org/postgres-mcp",
"name": "org/postgres-mcp",
"scope": [
"local"
],
"category": "Databases",
"languages": [
"python"
]
}
]
}
}Tags
x402
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Zero review prompt (fires after every successful call)
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