← The evidence ledger
Evidence row 2201870
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://us-tax-calc.x402tookit.com/payroll-tax
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 192478ab3ed5e7df3d216e0559fa13b7df498833d1e7c9068f6363fdaebeb6ec
- Leaf
- 0x52e06e02b0ceadf2b39eb66ca3ebf6448f791a46464cea09ec5bd270de46b6cb
What was observed
{
"endpoints": [
[
"x402",
"https://us-tax-calc.x402tookit.com/payroll-tax"
]
],
"name": "US Tax Calculators",
"owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
"raw": {
"accepts": [
{
"amount": "30000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "30000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
"transactionVersions": [
0
]
},
"maxTimeoutSeconds": 300,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"scheme": "exact"
},
{
"amount": "30000",
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:137",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "30000",
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:42161",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
}
],
"description": "US FICA tax on wages (Social Security, Medicare, Additional Medicare) with the employer split, and self-employment tax.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"wages": 90000,
"year": 2025
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-21T05:43:36.384Z",
"combinedEmployeeEmployerTotal": 13770,
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"employee": {
"additionalMedicareOwedOnReturn": 0,
"additionalMedicareThresholdForStatus": 200000,
"additionalMedicareWithheld": 0,
"medicare": 1305,
"socialSecurity": 5580,
"total": 6885
},
"employer": {
"medicare": 1305,
"socialSecurity": 5580,
"total": 6885
},
"filingStatus": "single",
"notChecked": [
"state and local income tax",
"tax credits (child tax credit, earned income, education, energy) and AMT",
"…5 more"
],
"reasons": [
"Social Security applies to wages up to the 2025 wage base of 176100; Medicare has no cap.",
"Additional Medicare Tax (0.9%) is owed on the return above 200000 for Single, but an employer withholds it over 200,000 regardless of filing status; the two can differ."
],
"socialSecurityWageBase": 176100,
"socialSecurityWages": 90000,
"source": "computed locally",
"summary": "2025: employee FICA on 90000 of wages is 6885; employer pays 6885.",
"taxYear": 2025,
"verdict": "COMPUTED",
"wages": 90000
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"filing_status": {
"description": "single (default), mfj, mfs, hoh or qss; sets Additional Medicare threshold",
"type": "string"
},
"self_employment_income": {
"description": "Net self-employment profit, dollars",
"type": "number"
},
"wages": {
"description": "W-2 wages, dollars (give wages and/or self_employment_income)",
"type": "number"
},
"year": {
"description": "Tax year (default: latest bundled)",
"type": "integer"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"combinedEmployeeEmployerTotal": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"employee": {
"properties": {
"additionalMedicareOwedOnReturn": {
"type": [
"null",
"number"
]
},
"additionalMedicareThresholdForStatus": {
"type": [
"null",
"number"
]
},
"additionalMedicareWithheld": {
"type": [
"null",
"number"
]
},
"medicare": {
"type": [
"null",
"number"
]
},
"socialSecurity": {
"type": [
"null",
"number"
]
},
"total": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"employer": {
"properties": {
"medicare": {
"type": [
"null",
"number"
]
},
"socialSecurity": {
"type": [
"null",
"number"
]
},
"total": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"filingStatus": {
"type": [
"null",
"string"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"socialSecurityWageBase": {
"type": [
"null",
"number"
]
},
"socialSecurityWages": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"taxYear": {
"type": [
"null",
"number"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"wages": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T23:23:26.886Z",
"quality": {
"l30DaysTotalCalls": 1,
"l30DaysUniquePayers": 1,
"lastCalledAt": "2026-11-01T23:23:26.589Z"
},
"resource": "https://us-tax-calc.x402tookit.com/payroll-tax",
"serviceName": "US Tax Calculators",
"tags": [
"tax",
"fica",
"payroll",
"self-employment",
"medicare"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "US FICA tax on wages (Social Security, Medicare, Additional Medicare) with the employer split, and self-employment tax."
}What the leaf hashes
{"body":"192478ab3ed5e7df3d216e0559fa13b7df498833d1e7c9068f6363fdaebeb6ec","id":2201870,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646809967707,"prev":null,"subject":"x402_bazaar:https://us-tax-calc.x402tookit.com/payroll-tax","subject_kind":"source_record"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (444186 rows).
- 0x52e05e84b8f88b7e39ea929f6c1363315d7bab7ec4d8d18cde143ae1a20ab68f
- 0xa963479958b9c669839d7a9165fa600daa9ba5d20ec621c63873b05baaba04f1
- 0xffb94d60205e46ab95393454a6cef39fb5432730a4002c8456b8d395b7047787
- 0x7829c3657cc6320f65d9d3c3fa44ef45f0ecc01e2588c737a805fb35d8f816d4
- 0xc7de9a52623b4e7c4ed3b408012cbdfcb90df405d90d212fedfae79e97c89249
- 0x08d6931ca0c52573a0f313fd8bc73ab26be9f63c41d727d7d32f95411973483e
- 0xfc2abb5a966bbe287bb23f65b745aafc2204bd63ceffb0864b9a5c6a00a05c7c
- 0xeb44d89ce47ac331ae97060e5aa1beb4b04950c5890360de01ecf33c4d852ad0
- 0x83f6e96c3323715c91c0a43f90d8c2fe3f01ac6aa0275049293526780dc738e4
- 0x2d9cd715206f30b83a7d5714962d9a4bdf3766e91eb879b8a125d3902a4c6f1c
- 0xf3842ec1d284b8dd3e855c5753327f72acb17d14a34c74476e1548a808165dcc
- 0x72adf61d2802939b48d74a549823053f636277c76140db963cda7bbd192a3539
- 0x1af6bd9d49aa04d9f41d673388facaaa9e6daacb0aa9aad0dcf31353556f6ee6
- 0xa96ecfe7ab9f1788120ca262a1b69b7b258160df41b4041d36fcd211c95d26d9
- 0x67c99d356de30f9cfab88af48fbaa18909ef230dd09947e84da060bc03aca929
- 0x1068659ec8f2bcf26e4ad39786557a8c45d60e5ebba4fce2fb9962b2c9c59920
- 0xf9973981f80219d4f00fa9186b40a8144accc0c9875572fb79eaea312a21a187
- 0x4d205063c881c48edbbb37762a8d3bbb7444d4c42daa882f663a231893d25c35
- 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af