Marketplace · API · x402

x402.donnyautomation.com/treasury

US Treasury par yield curve, every constant maturity from 1 month to 30 years for a published business day. Returns curve[] with tenor, months and percent, spreads (2s10s, 3m10y, 5s30s) and an explicit inversion flag - the real question is whether the curve is inverted, not what fourteen numbers are. A tenor Treasury did not publish is null, never zero. Pass ?latest=1 OR ?date=YYYY-MM-DD, not both. Errors: 400 conflicting_params|bad_latest|bad_date, 404 no_curve with the available range.

Endpointhttps://x402.donnyautomation.com/treasury
Trust✓ Verified callable · 100% uptime over 1 checks · ~341 ms
PricingPay per call with x402, no account. Call it to get an exact quote before paying.
networkeip155:8453
schemeexact
pay to0x2740651e046c59aB2A6510401140643292d3a96F
methodGET
last updated2026-11-11T06:06:39.916Z

Use it

Call it (an x402 client pays automatically)

curl -i https://x402.donnyautomation.com/treasury
# 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-fd21a4306d901258

Search the whole marketplace from your agent (MCP)

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