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TaxRate US
x402
TaxRate US is a paid API for AI agents from x402-taxrate.onrender.com, paid per call via x402, $0.03/call, status down (last checked 2026-10-22).
Look up US sales tax rates by ZIP code, state, or address, with economic-nexus reference data at state granularity.
Price / call$0.03
Success—
StatusDown
How this service works
US sales-tax rate lookup (state granularity) and economic-nexus reference. Terms of service: GET /terms (free). Not tax advice.
Output
Returns the sales tax rate for the specified US location (at state granularity), along with economic-nexus reference information for the relevant state. The response includes the applicable rate percentage and nexus threshold data to help businesses understand their tax obligations.
Example use cases
E-commerce checkout tax calculation
“My customer is checking out and their shipping address is in Austin, Texas — ZIP 73301. What sales tax rate should I apply to their order?”
Economic nexus compliance check
“I'm expanding my online store to serve customers in Florida. What's the sales tax rate there, and do you have info on Florida's economic nexus thresholds?”
Invoice tax line for a specific address
“I need the correct sales tax rate for a business address at 350 Fifth Avenue, New York — it has a ZIP code of 10118. What rate should I put on the invoice?”
Technical details
Endpoint
GEThttps://x402-taxrate.onrender.com/rate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, programmatic US sales tax rate lookup at state granularity for a known ZIP code, state abbreviation, or address string, especially when building e-commerce checkout flows, invoice generation, or compliance tooling. It is well-suited for lightweight per-call lookups ($0.03 USDC) where county/city sub-rate precision is not required. Prefer alternatives if you need sub-state (county or city) tax rate breakdowns, international VAT/GST data, or real-time nexus tracking beyond reference thresholds.
Side effects
- Invalid or non-existent ZIP code returns an error or empty result
- State code mismatch with ZIP code (e.g. TX zip paired with CA state) may return an error or reject the request
- Missing required query parameter (zip, state, or address) may result in an ambiguous or failed lookup
- Free-form address without a recognizable 5-digit ZIP may fail to extract a location
- Service unavailability on the Render.com host may return a 503 or timeout
- Payment failure via x402 protocol returns a 402 Payment Required before any data is returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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