# API

Source: https://www.yieldcurve.pro/api

Programmatic access to US Treasury yield curve data, auction results, term premia, and FOMC decisions via a REST API with JSON responses.

The built-in playground lets you try any endpoint immediately in sandbox mode — no account or API key needed. Sandbox requests are rate-limited to 10 per day and responses are truncated to 5 rows. Toggle "Use my API key" for full authenticated access.

Endpoints cover curves, levels, slopes, forwards, premia, regimes, auctions, and fed decisions. Authentication uses Bearer tokens generated from your Account Dashboard. Rate limits reset daily at midnight UTC across Free, Basic, and Pro tiers.