Sales-tax rates for up to 100 US locations in one call (Streamlined Sales Tax st
Sales-tax rates for up to 100 US locations in one call (Streamlined Sales Tax states)
Answeringour last check, 2026-10-21
1 of 1checks answered this week
960 msmedian answer time
$0.1listed price per call
$0.1price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://data.spencermcw.com/v1/tax/sales-rate/batch
| Category | Everything else |
|---|---|
| Provider host | data.spencermcw.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | valid payment request | 402 | $0.1 | 960 ms |
Example input (from the provider)
{
"body": {
"locations": [
{
"date": "2026-10-19",
"zip": "98101-3143"
},
{
"zip": "90210"
}
]
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"locations": {
"items": {
"additionalProperties": false,
"properties": {
"address": {
"description": "Optional street address line with house number, e.g. \"1010 E Alder St\" or \"PO Box 12\"; matched against the state address records when it publishes them.",
"maxLength": 120,
"minLength": 3,
"type": "string"
},
"date": {
"description": "The sale date, YYYY-MM-DD (default: today, UTC). From the first day of the previous quarter onward.",
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"type": "string"
},
"zip": {
"description": "A 5-digit ZIP code or a ZIP+4 (98101-3143 or 981013143).",
"pattern": "^\\d{5}(-?\\d{4})?$",
"type": "string"
}
},
"required": [
"zip"
],
"type": "object"
},
"maxItems": 100,
"minItems": 1,
"type": "array"
}
},
"required": [
"locations"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"additionalProperties": false,
"properties": {
"results": {
"items": {
"oneOf": [
{
"additionalProperties": false,
"properties": {
"answer": {
"additionalProperties": false,
"properties": {
"agreement": {
"type": "object"
},
"alternate": {
"type": "array"
},
"combined": {
"type": "object"
},
"components": {
"type": "array"
},
"effective": {
"type": "object"
},
"jurisdiction_codes": {
"type": "object"
},
"location": {
"type": "object"
},
"matched": {
"enum": [
"address",
"zip4",
"zip5"
],
"type": "string"
},
"rate": {
"type": "string"
},
"state": {
"type": "string"
},
"state_fips": {
"type": "string"
}
},
"required": [
"location",
"state",
"state_fips",
"matched",
"rate",
"combined",
"components",
"jurisdiction_codes",
"alternate",
"effective",
"agreement"
],
"type": "object"
},
"index": {
"maximum": 9007199254740991,
"minimum": -9007199254740991,
"type": "integer"
},
"ok": {
"const": true,
"type": "boolean"
}
},
"required": [
"index",
"ok",
"answer"
],
"type": "object"
},
{
"additionalProperties": false,
"properties": {
"error": {
"additionalProperties": false,
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"