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Production access to the Zamp sales tax API comes with your Zamp account — the same account where Zamp manages your registrations, filings, and remittance.

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Get your API key

1

Sign in to your Zamp account

Go to app.zamp.com and sign in.
2

Copy your API key

Open the Integrations page and copy your API key. If you don’t see a key there, your Zamp representative can issue one for you.
3

Authenticate and build

Pass the key as a bearer token in the Authorization header — see Authentication — then follow the Quickstart to make your first calculation.
Production keys carry access to your company’s live tax data. Keep them out of client-side code and version control, and rotate a key immediately if you suspect it has been exposed.

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Moving from trial to production

The API is identical in trial and production — same endpoints, same request and response shapes. Swap the key and your integration carries over as-is.

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Don’t have a Zamp account yet?

A Zamp account is more than an API key. Zamp registers your business where you owe tax, files and remits every return on time, and resolves notices — the managed service trusted by 1,200+ finance and accounting teams, with $400M+ in sales tax remitted and 150K+ on-time filings. Pricing is scoped to your actual footprint, and API calls are never metered.

Get started

Talk to our team

See the API and the managed service on your own use case, and get your account set up.

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Last modified on August 21, 2026