Marketplace · API · x402

usaref.dev/v1/certified/:country/:series

Certified extract of one North American reference value (policy rate, VAT, minimum wage, statutory interest, tax rates and more, 10 North American countries): the value and its citation, sha256 of the archived official source and the verification chain, Ed25519-signed for audit and compliance files. Refused without charge when no archived evidence exists. GET /v1/certified/{country}/{series}.

Endpoint	`https://usaref.dev/v1/certified/:country/:series`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~1227 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	0x1F0409ccD20A2fb497d4DeCeF4E17e9d0688FeA6
method	GET
last updated	2026-10-28T08:35:32.811Z

Use it

Call it (an x402 client pays automatically)

curl -i https://usaref.dev/v1/certified/:country/:series
# 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/x402-86113be4b4a29671

Search the whole marketplace from your agent (MCP)

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