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Which API Should I Call — x402 Market API Finder
x402
Which API Should I Call — x402 Market API Finder is a paid API for AI agents from agentsvc.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-21).
Search ~45,000 x402-listed API endpoints by plain-language task description to find the best matching paid APIs, with pricing, provider, network, and reachability data.
Price / call$0.005
Success—
StatusUnknown
How this service works
Find the right paid API for a task across the whole x402 market, not only agentsvc.io: describe what your agent needs in plain words ("convert a web page to markdown", "token price on Solana", "transcribe audio") and get the best matching x402 endpoints from about 45,000 listed ones, each with provider, URL, method, price in USD, payment networks, an input hint, and whether it answered our own check with a valid 402 (reachable, checked_at, response time).
Output
A JSON array of up to 20 matching API endpoints, each containing the provider name, endpoint URL, HTTP method, price per call in USD, accepted payment networks, a plain-language input hint describing what to send, and reachability metadata (whether the endpoint returned a valid 402, when it was last checked, and response time in ms).
Example use cases
Finding cheapest web-scraping API on Base
“Search the x402 market for APIs that convert a web page to markdown, only show ones that accept Base network payments and cost under $0.01, give me the top 5 results.”
Discovering token price endpoints for a trading bot
“My agent needs to fetch live token prices on Solana — search the x402 API directory for the best matching endpoints, up to 8 results, and only include ones that were reachable in the last check.”
Selecting an audio transcription API for a voice assistant
“Which x402 APIs can transcribe audio or voice recordings to text? Show me up to 10 options from across the whole market, sorted by best match, with their prices and payment networks.”
Technical details
Endpoint
POSThttps://agentsvc.io/api/v1/proxy/service-finder?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to dynamically discover which x402-compatible paid API to call for a given task at runtime, rather than hardcoding a specific endpoint. It is the right choice when the agent does not know in advance which provider or URL to use, when the user's task may map to multiple competing APIs, or when you want to filter by blockchain payment network or price cap before committing to a call. Prefer this over manual API directories when you need reachability confirmation and pricing in a single lookup across ~45,000 listings.
Side effects
- Task description too vague — returns low-relevance matches or empty results
- No endpoints match the requested network/price combination — returns empty result set
- All matching endpoints were unreachable and include_unreachable is false — empty results
- Task string under 3 characters or over 500 — rejected with validation error
- limit exceeds 20 — request rejected
- Network value not in enum — validation error returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| task | string | What your agent needs, in plain words |
| limit | integer | |
| network | string | Only endpoints that accept payment on this network |
| max_price_usd | number | Only endpoints at or below this price per call |
| include_unreachable | boolean | Also return endpoints that failed our last check |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {},
"success": true
}
}Tags
x402
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