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x402toll.com US Sales Tax Calculator
x402
x402toll.com US Sales Tax Calculator is a paid API for AI agents from x402toll.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Adds or removes US sales tax from a dollar amount using verified 2026 state base rates for any US state or DC, with optional local rate support and flags for gross-receipts and local-only states.
Price / call$0.05
Success—
StatusUnknown
How this service works
US sales tax — add or remove tax using the verified 2026 STATE base rate for any state + DC, plus an optional local rate. Flags gross-receipts states (HI/NM) and local-only states (AK).
Output
Returns the tax-adjusted total amount, the tax amount applied, the effective combined tax rate, the verified 2026 state base rate, and flags indicating whether the state uses a gross-receipts tax model (HI, NM) or relies solely on local rates (AK).
Example use cases
Example prompt
“I'm selling a $79.99 item to a customer in Texas — can you add the 2026 state sales tax plus a 2% local rate to get the final price they should pay?”
Technical details
Endpoint
POSThttps://x402toll.com/v1/commerce/sales-taxWhen to prefer
Use this endpoint when you need accurate, up-to-date 2026 US state sales tax calculations for e-commerce checkout, invoice generation, or price display — especially when you need to handle edge cases like Hawaii/New Mexico gross-receipts taxes or Alaska's local-only tax structure. Prefer this over generic tax APIs when you need to both add AND remove tax (e.g., back-calculating pre-tax amounts from tax-inclusive prices).
Side effects
- Invalid or missing state code returns a 400 error
- Amount is zero or negative — API may reject or return zero tax
- Unsupported state code (non-US territory) returns an error
- localRatePct provided as a negative number may cause unexpected results
- Network timeout or payment failure returns a 402 or 5xx response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| mode | string | |
| state | string | 2-letter US state/DC code |
| amount | number | |
| localRatePct | number |
Tags
x402
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