Quarterly sales-tax rate and boundary changes in the Streamlined Sales Tax state
Quarterly sales-tax rate and boundary changes in the Streamlined Sales Tax states
Answeringour last check, 2026-10-21
1 of 1checks answered this week
1496 msmedian answer time
$0.05listed price per call
$0.05price 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
GET https://data.spencermcw.com/v1/tax/changes
| 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 | $0.05 | 1496 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"entity": "rate",
"limit": 1,
"state": "WA"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"cursor": {
"pattern": "^\\d{1,12}$",
"type": "string"
},
"effective_from": {
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"type": "string"
},
"entity": {
"enum": [
"rate",
"zip4",
"zip5",
"address_records",
"file"
],
"type": "string"
},
"limit": {
"maximum": 100,
"minimum": 1,
"type": "integer"
},
"since": {
"format": "date-time",
"pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
"type": "string"
},
"state": {
"pattern": "^[A-Za-z]{2}$",
"type": "string"
}
},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"additionalProperties": false,
"properties": {
"next_cursor": {
"type": [
"string",
"null"
]
},
"records": {
"items": {
"additionalProperties": false,
"properties": {
"detected_at": {
"type": "string"
},
"effective": {
"type": "string"
},
"entity": {
"enum": [
"rate",
"zip4",
"zip5",
"address_records",
"file"
],
"type": "string"
},
"field": {
"type": "string"
},
"id": {
"type": "string"
},
"key": {
"type": "string"
},
"method_version": {
"type": "string"
},
"new": {
"type": [
"string",
"null"
]
},
"old": {
"type": [
"string",
"null"
]
},
"source_sha256_new": {
"type": [
"string",
"null"
]
},
"source_sha256_old": {
"type": [
"string",
"null"
]
},
"state": {
"type": "string"
}
},
"required": [
"id",
"entity",
"state",
"key",
"field",
"old",
"new",
"effective",
"detected_at",
"source_sha256_old",
"source_sha256_new",
"method_version"
],
"type": "object"
},
"type": "array"
}
},
"required": [
"records",
"next_cursor"
],
"type": "object"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}