GoTruTax sales tax API and MCP serverA REST API and an MCP server for US sales tax: calculate tax on a cart, look up rates by ZIP code, and check economic nexus by state. Every account gets 1,000 live calculations a month free; test keys are never billed.

POST /api/v1/public/calculate: tax a cart at a ship-to address

GET /api/v1/public/rates: rates for a ZIP code

POST /api/v1/public/nexus/check: economic nexus by state

GET /api/v1/public/usage: this month's usage

MCP server: https://gotrutax.com/mcp. Create a free account to get an API key.