The statutory interest rate API
Everything on this site is available as data — free, no key, no rate cards to scrape. Static JSON on a CDN, so it's fast everywhere and never goes down with a backend.
Endpoints
| Endpoint | Returns |
|---|---|
/api/v1/index.json | Service index — links + counts |
/api/v1/meta.json | Dataset metadata, freshness, sources |
/api/v1/entities.json | All series with latest values |
/api/v1/latest.json | Flat list of every current value (one call) |
/api/v1/entity/{slug}.json | One series — latest + full history + provenance |
/api/v1/entity/{slug}.csv | Same history as CSV (spreadsheet-ready) |
Every observation carries value, unit,
effective_date, source_url, retrieved_at,
confidence (high = published by the source; medium = derived, with the formula in
notes). OpenAPI 3.1 spec ships in the repository (machine/openapi.yaml).
For AI agents (MCP)
An MCP server exposes the same dataset with tools for search, lookup, comparison, and
statutory-interest computation (calculate_interest) — so an agent can answer
"how much interest has accrued on this judgment" with a citable, current figure instead of a stale
guess. See the repository's machine/mcp-server/README.md for one-line registration in
Claude Desktop / Claude Code, and /llms.txt for a machine-readable summary.
Fair use & licensing
- Free for apps, research, and internal tools — attribution appreciated (link to the series page you used).
- The underlying values are U.S./UK/EU government works; this compiled, normalized, effective-dated dataset is maintained by StatuteRates.
- Bulk exports, redistribution, SLAs, or commercial licensing (including AI training use): contact the maintainer — see the About page.
Series directory
- 1-Year Treasury Constant Maturity Yield (weekly average) — JSON · CSV
- Alabama Judgment Interest Rate — JSON · CSV
- Alabama Prejudgment Interest Rate — JSON · CSV
- Alaska Judgment Interest Rate — JSON · CSV
- Alaska Prejudgment Interest Rate — JSON · CSV
- Arizona Judgment Interest Rate — JSON · CSV
- Arizona Prejudgment Interest Rate — JSON · CSV
- Arkansas Judgment Interest Rate — JSON · CSV
- Arkansas Prejudgment Interest Rate — JSON · CSV
- Bank of England Bank Rate — JSON · CSV
- California Post-Judgment Interest Rate — JSON · CSV
- California Prejudgment Interest Rate — JSON · CSV
- Colorado Judgment Interest Rate — JSON · CSV
- Colorado Prejudgment Interest Rate — JSON · CSV
- Connecticut Judgment Interest Rate — JSON · CSV
- Connecticut Prejudgment Interest Rate — JSON · CSV
- D.C. Prejudgment Interest Rate — JSON · CSV
- Delaware Judgment Interest Rate — JSON · CSV
- Delaware Prejudgment Interest Rate — JSON · CSV
- District of Columbia Judgment Interest Rate — JSON · CSV
- ECB Main Refinancing Operations Rate — JSON · CSV
- EU Late Payment Directive Reference Rate — JSON · CSV
- Florida Judgment Interest Rate — JSON · CSV
- Florida Prejudgment Interest Rate — JSON · CSV
- Georgia Judgment Interest Rate — JSON · CSV
- Georgia Prejudgment Interest Rate — JSON · CSV
- Hawaii Judgment Interest Rate — JSON · CSV
- Hawaii Prejudgment Interest Rate — JSON · CSV
- Idaho Judgment Interest Rate — JSON · CSV
- Idaho Prejudgment Interest Rate — JSON · CSV
- Illinois Judgment Interest Rate — JSON · CSV
- Illinois Prejudgment Interest Rate — JSON · CSV
- Indiana Judgment Interest Rate — JSON · CSV
- Indiana Prejudgment Interest Rate — JSON · CSV
- Iowa Judgment Interest Rate — JSON · CSV
- Iowa Prejudgment Interest Rate — JSON · CSV
- IRC §6603 Deposit / Federal Short-Term Rate — JSON · CSV
- IRS GATT Rate (corporate overpayment over $10,000) — JSON · CSV
- IRS Large Corporate Underpayment Rate (LCU) — JSON · CSV
- IRS Overpayment Interest Rate — Corporate — JSON · CSV
- IRS Overpayment Interest Rate — Non-Corporate — JSON · CSV
- IRS Underpayment Interest Rate (§6621) — JSON · CSV
- Kansas Judgment Interest Rate — JSON · CSV
- Kansas Prejudgment Interest Rate — JSON · CSV
- Kentucky Judgment Interest Rate — JSON · CSV
- Kentucky Prejudgment Interest Rate — JSON · CSV
- Louisiana Judgment Interest Rate — JSON · CSV
- Louisiana Prejudgment Interest Rate — JSON · CSV
- Maine Judgment Interest Rate — JSON · CSV
- Maine Prejudgment Interest Rate — JSON · CSV
- Maryland Judgment Interest Rate — JSON · CSV
- Maryland Prejudgment Interest Rate — JSON · CSV
- Massachusetts Judgment Interest Rate — JSON · CSV
- Massachusetts Prejudgment Interest Rate — JSON · CSV
- Michigan Judgment Interest Rate — JSON · CSV
- Michigan Prejudgment Interest Rate — JSON · CSV
- Minnesota Judgment Interest Rate — JSON · CSV
- Minnesota Prejudgment Interest Rate — JSON · CSV
- Mississippi Prejudgment Interest Rate — JSON · CSV
- Missouri Judgment Interest Rate — JSON · CSV
- Missouri Prejudgment Interest Rate — JSON · CSV
- Montana Judgment Interest Rate — JSON · CSV
- Montana Prejudgment Interest Rate — JSON · CSV
- Nebraska Judgment Interest Rate — JSON · CSV
- Nebraska Prejudgment Interest Rate — JSON · CSV
- Nevada Judgment Interest Rate — JSON · CSV
- Nevada Prejudgment Interest Rate — JSON · CSV
- New Hampshire Judgment Interest Rate — JSON · CSV
- New Hampshire Prejudgment Interest Rate — JSON · CSV
- New Jersey Judgment Interest Rate — JSON · CSV
- New Jersey Prejudgment Interest Rate — JSON · CSV
- New Mexico Judgment Interest Rate — JSON · CSV
- New Mexico Prejudgment Interest Rate — JSON · CSV
- New York Consumer-Debt Judgment Interest Rate — JSON · CSV
- New York Judgment Interest Rate — JSON · CSV
- New York Prejudgment Interest Rate — JSON · CSV
- North Carolina Judgment Interest Rate — JSON · CSV
- North Carolina Prejudgment Interest Rate — JSON · CSV
- North Dakota Judgment Interest Rate — JSON · CSV
- North Dakota Prejudgment Interest Rate — JSON · CSV
- Ohio Judgment Interest Rate — JSON · CSV
- Ohio Prejudgment Interest Rate — JSON · CSV
- Oklahoma Judgment Interest Rate — JSON · CSV
- Oklahoma Prejudgment Interest Rate — JSON · CSV
- Oregon Judgment Interest Rate — JSON · CSV
- Oregon Prejudgment Interest Rate — JSON · CSV
- Pennsylvania Judgment Interest Rate — JSON · CSV
- Pennsylvania Prejudgment Interest Rate — JSON · CSV
- Rhode Island Judgment Interest Rate — JSON · CSV
- Rhode Island Prejudgment Interest Rate — JSON · CSV
- South Carolina Judgment Interest Rate — JSON · CSV
- South Carolina Prejudgment Interest Rate — JSON · CSV
- South Dakota Judgment Interest Rate — JSON · CSV
- South Dakota Prejudgment Interest Rate — JSON · CSV
- Tennessee Judgment Interest Rate — JSON · CSV
- Tennessee Prejudgment Interest Rate — JSON · CSV
- Texas Judgment Interest Rate — JSON · CSV
- Texas Prejudgment Interest Rate — JSON · CSV
- U.S. Federal Post-Judgment Interest Rate (28 U.S.C. §1961) — JSON · CSV
- UK Statutory Interest on Late Commercial Payments — JSON · CSV
- Utah Judgment Interest Rate — JSON · CSV
- Utah Prejudgment Interest Rate — JSON · CSV
- Vermont Judgment Interest Rate — JSON · CSV
- Vermont Prejudgment Interest Rate — JSON · CSV
- Virginia Judgment Interest Rate — JSON · CSV
- Virginia Prejudgment Interest Rate — JSON · CSV
- Washington Judgment Interest Rate — JSON · CSV
- Washington Prejudgment Interest Rate — JSON · CSV
- West Virginia Judgment Interest Rate — JSON · CSV
- West Virginia Prejudgment Interest Rate — JSON · CSV
- Wisconsin Judgment Interest Rate — JSON · CSV
- Wisconsin Prejudgment Interest Rate — JSON · CSV
- Wyoming Judgment Interest Rate — JSON · CSV
- Wyoming Prejudgment Interest Rate — JSON · CSV
Dataset last compiled July 10, 2026. IRS quarterly; US Treasury/post-judgment weekly; UK/EU statutory rates semi-annual; BoE/ECB policy rates on decision. Refreshed weekly.