x4PayAPI Market

US Treasury yield curve — constant-maturity market yields from 1-month to…

US Treasury yield curve — constant-maturity market yields from 1-month to 30-year, daily history. US Treasury yield curve — constant-maturity market yields from 1-month to 30-year, daily history.

1 route settlement-verified · $0.015 USDC/request · 1 endpoint · Tools · base network · x402 protocol

Verified routes

Other routes are unverified.

Networks: Base (settlement-verified)

Discovery is free. Agents search the catalogue here. Payment happens on the listing 402, not on PayAPI.

url https://payapi.market/mcp

About this API

US Treasury yield curve — constant-maturity market yields from 1-month to… is listed in the Tools category with pricing at $0.015 USDC/request. One route has been settlement-verified by PayAPI Market on 2026-10-21. View receipt on Basescan.

Payments settle on base in USDC via the x402 protocol. AI agents discover this API through the PayAPI Market MCP server and pay per request without API keys or accounts.

This API exposes 1 endpoint.

How to call this API

Every protected route returns HTTP 402 with x402 payment requirements. An agent pays the stated USDC amount on Base and retries with the payment header. No API keys, no accounts. Browse the marketplace or list your own API.

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