OTD Data API

The OTD Data API is a monthly data subscription for the same fee book behind the public calculators: state sales-tax treatment, title, registration, plates, lien, and dealer doc-fee rules, plus county and city rates where a state has them.

Verified official sources

Every figure comes from an official government source and carries the date it was last checked. When a figure has not been verified, the API says so instead of guessing. It never fills a gap with a typical or average fee.

Who it is for

Dealerships, lenders, brokers, and publishers that want the same out-the-door estimate the website shows inside their own tools, without maintaining fifty state spreadsheets.

Get access

Sign up to start a trial. Technical documentation is available in your dashboard after you log in. Plans and limits are on pricing.