⬢github TypeScript · 7 ★ +2 since we first saw it · pushed 2 d ago · MIT
equated-org/opentaxrate
US sales tax rates by street address, from the states' own published data.
OpenTaxRate is an open-source API that returns combined US (and Canadian) sales tax rates for a specific street address and date, using rates and boundaries published by the tax agencies themselves. It returns the rate, jurisdiction breakdown, and source, and explicitly returns an error (422) when a lookup is ambiguous rather than guessing.
Why now: It was just launched on Hacker News as a Show HN project, likely appealing as a self-hosted, verifiable alternative to paid tax APIs, with published benchmarks against official answers.
Who it is for: Ecommerce developers and accountants who need accurate address-level sales tax rates without paying for services like Avalara or Stripe Tax.
accountingapiecommerceopen-datapostgissales-taxsales-tax-apiself-hostedtax-apitypescript
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