evidence402.onrender.com/api/v1/search

Find and deduplicate scholarly papers from Crossref and Europe PMC. Use for literature discovery with DOI source links.

Endpoint	`https://evidence402.onrender.com/api/v1/search`
Trust	100% uptime over 1 checks · ~628 ms
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
network	eip155:8453
scheme	exact
pay to	0xc60674058497BfcD73a1b74aCc46B66E1AE5176D
method	POST
last updated	2026-11-02T12:03:52.337Z

Use it

Call it (an x402 client pays automatically)

curl -i https://evidence402.onrender.com/api/v1/search
# 402 reply -> sign PAYMENT-REQUIRED with an x402 client (e.g. @x402/fetch) -> retry with PAYMENT-SIGNATURE

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/x402-f26fefade988aecd

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}