US Treasury Yield Spread Calculator

Use this endpoint when you need a precise, point-in-time spread between any two specific US Treasury tenors, especially for yield curve inversion analysis. Prefer this over fetching the full yield curve when you only need a single spread value. Ideal for recession signal monitoring, fixed income analysis, or any workflow that needs to programmatically detect yield curve inversion between arbitrary tenor pairs.

• Invalid tenor code returns an error — only specific tenors (1m, 1.5m, 2m, 3m, 4m, 6m, 1y, 2y, 3y, 5y, 7y, 10y, 20y, 30y) are accepted
• Date with no available Treasury data (weekends, federal holidays) may return an error or fall back to the nearest available date
• Future dates return an error as data is not yet available
• Render cold-start latency may cause occasional slow responses or timeouts
• Network errors from the underlying data source may result in 500-level errors