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data.spencermcw.com Sales Tax Rate Lookup
x402
data.spencermcw.com Sales Tax Rate Lookup is a paid API for AI agents from data.spencermcw.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-22).
Returns the sales-tax rate for a US location (ZIP+4, ZIP, or street address) in Streamlined Sales Tax states
Price / call$0.005
Success—
StatusUnknown
How this service works
The sales-tax rate at a US ZIP+4, ZIP or street address in a Streamlined Sales Tax state
Output
Returns a JSON object with the matched precision level (address, zip4, or zip5), the state and location details, the effective date range, combined general and food/drug rates, individual tax component breakdown, jurisdiction codes, and an agreement score indicating how many records agreed on the rate.
Example use cases
E-commerce checkout tax calculation
“What's the sales tax rate I should apply to a customer order shipping to ZIP code 80202 in Colorado? I need the combined general rate including state and local.”
Food delivery app tax compliance
“Look up the sales tax rate for 60601 as of 2024-07-01 — specifically the food and drug rate — so I can apply the right tax to a grocery delivery in Chicago.”
Accounting software address-level tax verification
“Can you get the sales tax rate for the address 123 Main St in ZIP+4 98004-1234? I want to confirm whether it matches at the address level or just the ZIP.”
Technical details
Endpoint
GEThttps://data.spencermcw.com/v1/tax/sales-rate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need precise, address-level or ZIP+4-level sales tax rates for US locations specifically in Streamlined Sales Tax member states. It is ideal for e-commerce checkout flows, tax compliance software, and invoice generation where accuracy matters at the sub-ZIP level. Prefer this over generic tax APIs when you need food/drug rate breakdowns, jurisdiction codes, and confidence signals (agreement score) on the matched rate.
Side effects
- ZIP code not found or not in a Streamlined Sales Tax state — no rate returned
- Invalid ZIP format — 400 validation error
- Address provided but not matchable — falls back to zip4 or zip5 precision
- Date out of range for available rate data — may return null effective 'to' date
- Payment failure (x402) — call blocked if USDC payment not completed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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