A sales tax API with a team behind it.
Two calls: quote the tax, post the sale. Rooftop-accurate rates across 12,000+ U.S. jurisdictions and Canada, and every sale you sync becomes a return we file.
Trusted by partners worldwide.
Built for developers. Run by experts.
Calculations become filings.
The transactions you post are the returns our team prepares, files, and remits. One integration covers checkout and compliance. Nothing to export later.
A trial key in minutes.
The transactions you post are the returns our team prepares, files, and remits. One integration covers checkout and compliance. Nothing to export later.
Real tax experts on the other end.
Registrations, filings, remittance, and state notices are handled by Zamp's tax team. Your code calculates tax; it never has to understand it.
What the Zamp sales tax API does.
Rooftop-accurate calculations.
POST /calculations quotes tax on the buyer's exact address, product tax codes, and any exemption, then returns it itemized by state, county, and city. P95 response around 400 milliseconds.
Post the sale, we file it.
POST /transactions records the completed sale, refunds included. Our team files and remits from there, and GET /filings returns due dates, amounts paid, and the filed documents.
Clean inputs, right answers.
POST /addresses validates and geocodes a ship-to address before you collect. GET /tax-codes lists every Zamp product tax code, so each SKU gets the treatment the state expects, not a ZIP guess.
A sandbox that acts like prod.
Your test account comes preloaded with all 47 remote seller state registrations. Same base URL, same request shapes, test data cleared after 30 days. 1,000 requests a minute out of the box.
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