Marketplace · API · x402

4yearcycle.com/x402/fx-rates

Official daily foreign exchange reference rates from the European Central Bank (~30 currencies vs EUR, published each business day around 16:00 CET), rebased on request to any listed currency via EUR cross-rates and filtered to a requested symbol list; returns the reference date, the rate table and the ECB source attribution.

Endpoint	`https://4yearcycle.com/x402/fx-rates`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~910 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	0x9862ca83b72aB95521F457aFf6e6EFb03d8164C3
method	GET
last updated	2026-11-13T02:18:15.486Z

Use it

Call it (an x402 client pays automatically)

curl -i https://4yearcycle.com/x402/fx-rates
# 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-dccf57f5c46e4c5b

Search the whole marketplace from your agent (MCP)

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