data.spencermcw.com
What is the sales tax rate at this US address, ZIP+4 or ZIP? The combined rate and each state, county, city and district rate in the 24 Streamlined Sales Tax states (WA, OH, MI, NJ, TN, …), computed by Distill from each state’s SST rate and boundary files. Updated quarterly. $0.005 per call (x402, USDC on Base); 3 free calls a day.
DataLiveeip155:8453Exactvia cdp
Calls · 30d
4
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 6 snapshots so far.
$0.73
Verified settled volume
28 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0050
Listed price
As published in the catalog. Always read the live 402 before paying.
4
Calls · 30d
Upstream's own call count for this endpoint, not ours.
3
Unique payers · 30d
Last called 2026-10-23 22:25Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xE6900aE625875b748f56Fb45C3e06a59Be8870DFThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xE6900aE625875b748f56Fb45C3e06a59Be8870DF",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://data.spencermcw.com/v1/tax/sales-rate",
"mimeType": "application/json",
"description": "The sales-tax rate at a US ZIP+4, ZIP or street address in a Streamlined Sales Tax state"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"zip": "98101-3143",
"date": "2026-10-19"
}
},
"output": {
"type": "json",
"example": {
"data": {
"rate": "0.1055",
"state": "WA",
"matched": "zip4",
"combined": {
"general": {
"interstate": "0.1055",
"intrastate": "0.1055"
},
"food_drug": {
"interstate": "0.1055",
"intrastate": "0.1055"
}
},
"location": {
"zip": "98101",
"date": "2026-10-19",
"plus4": "3143",
"address": null
},
"agreement": {
"agreeing": 1,
"finer_records": 1
},
"alternate": [],
"effective": {
"to": "2027-03-31",
"from": "2026-01-01"
},
"components": [
{
"code": "53",
"type": "45",
"general": {
"interstate": "0.065",
"intrastate": "0.065"
},
"food_drug": {
"interstate": "0.065",
"intrastate": "0.065"
},
"type_name": "State Taxing Authority",
"effective_to": null,
"jurisdiction": "state",
"effective_from": "1983-03-01"
},
{
"code": "63000",
"type": "01",
"general": {
"interstate": "0.0405",
"intrastate": "0.0405"
},
"food_drug": {
"interstate": "0.0405",
"intrastate": "0.0405"
},
"type_name": "City",
"effective_to": "2027-03-31",
"jurisdiction": "place",
"effective_from": "2026-01-01"
}
],
"state_fips": "53",
"jurisdiction_codes": {
"place": "63000",
"county": null,
"specials": [],
"place_class": null,
"state_indicator": "53",
"composite_ser_code": "01726"
}
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"zip"
],
"properties": {
"zip": {
"type": "string",
"pattern": "^\\d{5}(-?\\d{4})?$"
},
"date": {
"type": "string",
"pattern": "^\\d{4}-\\d{2}-\\d{2}$"
},
"address": {
"type": "string",
"maxLength": 120,
"minLength": 3
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"data": {
"type": "object",
"required": [
"location",
"state",
"state_fips",
"matched",
"rate",
"combined",
"components",
"jurisdiction_codes",
"alternate",
"effective",
"agreement"
],
"properties": {
"rate": {
"type": "string"
},
"state": {
"type": "string"
},
"matched": {
"enum": [
"address",
"zip4",
"zip5"
],
"type": "string"
},
"combined": {
"type": "object",
"required": [
"general",
"food_drug"
],
"properties": {
"general": {
"type": "object"
},
"food_drug": {
"type": "object"
}
},
"additionalProperties": false
},
"location": {
"type": "object",
"required": [
"zip",
"plus4",
"address",
"date"
],
"properties": {
"zip": {
"type": "string"
},
"date": {
"type": "string"
},
"plus4": {
"type": [
"string",
"null"
]
},
"address": {
"type": [
"string",
"null"
]
}
},
"additionalProperties": false
},
"agreement": {
"type": "object",
"required": [
"finer_records",
"agreeing"
],
"properties": {
"agreeing": {
"type": "integer",
"maximum": 9007199254740991,
"minimum": -9007199254740991
},
"finer_records": {
"type": "integer",
"maximum": 9007199254740991,
"minimum": -9007199254740991
}
},
"additionalProperties": false
},
"alternate": {
"type": "array",
"items": {
"type": "object",
"required": [
"product",
"code",
"rate"
],
"properties": {
"code": {
"type": "string"
},
"rate": {
"type": "string"
},
"product": {
"type": "string"
}
},
"additionalProperties": false
}
},
"effective": {
"type": "object",
"required": [
"from",
"to"
],
"properties": {
"to": {
"type": [
"string",
"null"
]
},
"from": {
"type": "string"
}
},
"additionalProperties": false
},
"components": {
"type": "array",
"items": {
"type": "object",
"required": [
"jurisdiction",
"code",
"type",
"type_name",
"general",
"food_drug",
"effective_from",
"effective_to"
],
"properties": {
"code": {
"type": "string"
},
"type": {
"type": "string"
},
"general": {
"type": "object"
},
"food_drug": {
"type": "object"
},
"type_name": {
"type": "string"
},
"effective_to": {
"type": [
"string",
"null"
]
},
"jurisdiction": {
"enum": [
"state",
"county",
"place",
"special"
],
"type": "string"
},
"effective_from": {
"type": "string"
}
},
"additionalProperties": false
}
},
"state_fips": {
"type": "string"
},
"jurisdiction_codes": {
"type": "object",
"required": [
"state_indicator",
"county",
"place",
"place_class",
"composite_ser_code",
"specials"
],
"properties": {
"place": {
"type": [
"string",
"null"
]
},
"county": {
"type": [
"string",
"null"
]
},
"specials": {
"type": "array"
},
"place_class": {
"type": [
"string",
"null"
]
},
"state_indicator": {
"type": "string"
},
"composite_ser_code": {
"type": [
"string",
"null"
]
}
},
"additionalProperties": false
}
},
"additionalProperties": false
}
}
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.005USDC≈ $0.005 USD
on Base · exact scheme
Pay 0.005 USDC on Base to 0xE690…870DF. The signed payment is good for 5 minutes.
- Paid to
- 0xE690…870DF
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 5000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xE6900aE625875b748f56Fb45C3e06a59Be8870DF",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"zip": "98101-3143",
"date": "2026-10-19"
}
},
"output": {
"type": "json",
"example": {
"data": {
"rate": "0.1055",
"state": "WA",
"matched": "zip4",
"combined": {
"general": {
"interstate": "0.1055",
"intrastate": "0.1055"
},
"food_drug": {
"interstate": "0.1055",
"intrastate": "0.1055"
}
},
"location": {
"zip": "98101",
"date": "2026-10-19",
"plus4": "3143",
"address": null
},
"agreement": {
"agreeing": 1,
"finer_records": 1
},
"alternate": [],
"effective": {
"to": "2027-03-31",
"from": "2026-01-01"
},
"components": [
{
"code": "53",
"type": "45",
"general": {
"interstate": "0.065",
"intrastate": "0.065"
},
"food_drug": {
"interstate": "0.065",
"intrastate": "0.065"
},
"type_name": "State Taxing Authority",
"effective_to": null,
"jurisdiction": "state",
"effective_from": "1983-03-01"
},
{
"code": "63000",
"type": "01",
"general": {
"interstate": "0.0405",
"intrastate": "0.0405"
},
"food_drug": {
"interstate": "0.0405",
"intrastate": "0.0405"
},
"type_name": "City",
"effective_to": "2027-03-31",
"jurisdiction": "place",
"effective_from": "2026-01-01"
}
],
"state_fips": "53",
"jurisdiction_codes": {
"place": "63000",
"county": null,
"specials": [],
"place_class": null,
"state_indicator": "53",
"composite_ser_code": "01726"
}
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"zip"
],
"properties": {
"zip": {
"type": "string",
"pattern": "^\\d{5}(-?\\d{4})?$"
},
"date": {
"type": "string",
"pattern": "^\\d{4}-\\d{2}-\\d{2}$"
},
"address": {
"type": "string",
"maxLength": 120,
"minLength": 3
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"data": {
"type": "object",
"required": [
"location",
"state",
"state_fips",
"matched",
"rate",
"combined",
"components",
"jurisdiction_codes",
"alternate",
"effective",
"agreement"
],
"properties": {
"rate": {
"type": "string"
},
"state": {
"type": "string"
},
"matched": {
"enum": [
"address",
"zip4",
"zip5"
],
"type": "string"
},
"combined": {
"type": "object",
"required": [
"general",
"food_drug"
],
"properties": {
"general": {
"type": "object"
},
"food_drug": {
"type": "object"
}
},
"additionalProperties": false
},
"location": {
"type": "object",
"required": [
"zip",
"plus4",
"address",
"date"
],
"properties": {
"zip": {
"type": "string"
},
"date": {
"type": "string"
},
"plus4": {
"type": [
"string",
"null"
]
},
"address": {
"type": [
"string",
"null"
]
}
},
"additionalProperties": false
},
"agreement": {
"type": "object",
"required": [
"finer_records",
"agreeing"
],
"properties": {
"agreeing": {
"type": "integer",
"maximum": 9007199254740991,
"minimum": -9007199254740991
},
"finer_records": {
"type": "integer",
"maximum": 9007199254740991,
"minimum": -9007199254740991
}
},
"additionalProperties": false
},
"alternate": {
"type": "array",
"items": {
"type": "object",
"required": [
"product",
"code",
"rate"
],
"properties": {
"code": {
"type": "string"
},
"rate": {
"type": "string"
},
"product": {
"type": "string"
}
},
"additionalProperties": false
}
},
"effective": {
"type": "object",
"required": [
"from",
"to"
],
"properties": {
"to": {
"type": [
"string",
"null"
]
},
"from": {
"type": "string"
}
},
"additionalProperties": false
},
"components": {
"type": "array",
"items": {
"type": "object",
"required": [
"jurisdiction",
"code",
"type",
"type_name",
"general",
"food_drug",
"effective_from",
"effective_to"
],
"properties": {
"code": {
"type": "string"
},
"type": {
"type": "string"
},
"general": {
"type": "object"
},
"food_drug": {
"type": "object"
},
"type_name": {
"type": "string"
},
"effective_to": {
"type": [
"string",
"null"
]
},
"jurisdiction": {
"enum": [
"state",
"county",
"place",
"special"
],
"type": "string"
},
"effective_from": {
"type": "string"
}
},
"additionalProperties": false
}
},
"state_fips": {
"type": "string"
},
"jurisdiction_codes": {
"type": "object",
"required": [
"state_indicator",
"county",
"place",
"place_class",
"composite_ser_code",
"specials"
],
"properties": {
"place": {
"type": [
"string",
"null"
]
},
"county": {
"type": [
"string",
"null"
]
},
"specials": {
"type": "array"
},
"place_class": {
"type": [
"string",
"null"
]
},
"state_indicator": {
"type": "string"
},
"composite_ser_code": {
"type": [
"string",
"null"
]
}
},
"additionalProperties": false
}
},
"additionalProperties": false
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-23 22:25Z
- Last indexed by Roundhouse
- 2026-10-26 17:30Z
- Last enriched (probe, favicon, geo)
- 2026-10-21 05:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 6 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service data.spencermcw.com and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=data.spencermcw.com' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://data.spencermcw.com/v1/tax/sales-rate, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.