← The evidence ledger
Evidence row 2201868
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://us-tax-calc.x402tookit.com/retirement-limits
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 50637323b48c2d4de0766361a702075edf33a9bd8d2670e84fb882d534af099c
- Leaf
- 0x68c86fd1ebc8f7a67bcbe819f43dd0a04d2eb7d8b1a5c1b1d49a6e0529c37696
What was observed
{
"endpoints": [
[
"x402",
"https://us-tax-calc.x402tookit.com/retirement-limits"
]
],
"name": "US Tax Calculators",
"owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
"raw": {
"accepts": [
{
"amount": "20000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
"transactionVersions": [
0
]
},
"maxTimeoutSeconds": 300,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:137",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:42161",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
}
],
"description": "IRS retirement and HSA contribution limits by year: 401(k), IRA, catch-up, SIMPLE, HSA, with an age-adjusted personal limit.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"age": 52,
"year": 2026
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-21T05:43:36.637Z",
"availableYears": [
2024,
2025
],
"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.",
"limits": {
"catchUpAge50": 8000,
"compensationLimit401a17": 360000,
"definedContributionPlanAnnualAdditions415c": 72000,
"elective401k403b457TspDeferral": 24500,
"highlyCompensatedEmployeeThreshold": 160000,
"hsaCatchUpAge55": 1000,
"hsaFamily": 8750,
"hsaSelfOnly": 4400,
"iraCatchUpAge50": 1100,
"iraContribution": 7500,
"simpleCatchUpAge50": 4000,
"simpleDeferral": 17000,
"simpleDeferralSmallOrMatchingEmployers": 18100,
"simpleSuperCatchUpAge60to63": 5250,
"superCatchUpAge60to63": 11250
},
"notChecked": [
"state and local income tax",
"tax credits (child tax credit, earned income, education, energy) and AMT",
"…5 more"
],
"personalLimits": {
"elective401k403b457": {
"base": 24500,
"catchUp": 8000,
"catchUpKind": "age 50+ catch-up",
"total": 32500
},
"hsaFamily": {
"base": 8750,
"catchUp": 0,
"total": 8750
},
"hsaSelfOnly": {
"base": 4400,
"catchUp": 0,
"total": 4400
},
"ira": {
"base": 7500,
"catchUp": 1100,
"total": 8600
},
"simple": {
"base": 17000,
"catchUp": 4000,
"total": 21000
}
},
"publishedStatus": "complete",
"reasons": [
"Age is measured at the end of the calendar year for catch-ups; the age 60-63 super catch-up replaces (does not add to) the age 50 catch-up."
],
"source": "computed locally",
"sourceDocuments": [
"https://www.irs.gov/pub/irs-drop/rp-25-32.pdf",
"https://www.irs.gov/pub/irs-drop/n-25-67.pdf",
"…3 more"
],
"summary": "2026: 401(k) elective deferral limit 24500 (catch-up 8000), IRA 7500 (catch-up 1100), HSA 4400 self-only or 8750 family.",
"verdict": "COMPUTED",
"year": 2026
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"age": {
"description": "Your age this year, for personal 401(k)/IRA/HSA limits",
"type": "integer"
},
"year": {
"description": "Year (default: latest full year; 2027 has HSA limits only)",
"type": "integer"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"availableYears": {
"items": {
"type": "number"
},
"type": [
"array",
"null"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"limits": {
"properties": {
"catchUpAge50": {
"type": [
"null",
"number"
]
},
"compensationLimit401a17": {
"type": [
"null",
"number"
]
},
"definedContributionPlanAnnualAdditions415c": {
"type": [
"null",
"number"
]
},
"elective401k403b457TspDeferral": {
"type": [
"null",
"number"
]
},
"highlyCompensatedEmployeeThreshold": {
"type": [
"null",
"number"
]
},
"hsaCatchUpAge55": {
"type": [
"null",
"number"
]
},
"hsaFamily": {
"type": [
"null",
"number"
]
},
"hsaSelfOnly": {
"type": [
"null",
"number"
]
},
"iraCatchUpAge50": {
"type": [
"null",
"number"
]
},
"iraContribution": {
"type": [
"null",
"number"
]
},
"simpleCatchUpAge50": {
"type": [
"null",
"number"
]
},
"simpleDeferral": {
"type": [
"null",
"number"
]
},
"simpleDeferralSmallOrMatchingEmployers": {
"type": [
"null",
"number"
]
},
"simpleSuperCatchUpAge60to63": {
"type": [
"null",
"number"
]
},
"superCatchUpAge60to63": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"personalLimits": {
"properties": {
"elective401k403b457": {
"properties": {
"base": {
"type": [
"null",
"number"
]
},
"catchUp": {
"type": [
"null",
"number"
]
},
"catchUpKind": {
"type": [
"null",
"string"
]
},
"total": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"hsaFamily": {
"properties": {
"base": {
"type": [
"null",
"number"
]
},
"catchUp": {
"type": [
"null",
"number"
]
},
"total": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"hsaSelfOnly": {
"properties": {
"base": {
"type": [
"null",
"number"
]
},
"catchUp": {
"type": [
"null",
"number"
]
},
"total": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"ira": {
"properties": {
"base": {
"type": [
"null",
"number"
]
},
"catchUp": {
"type": [
"null",
"number"
]
},
"total": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"simple": {
"properties": {
"base": {
"type": [
"null",
"number"
]
},
"catchUp": {
"type": [
"null",
"number"
]
},
"total": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
}
},
"type": [
"null",
"object"
]
},
"publishedStatus": {
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"null",
"string"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"sourceDocuments": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"year": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T23:23:28.166Z",
"quality": {
"l30DaysTotalCalls": 1,
"l30DaysUniquePayers": 1,
"lastCalledAt": "2026-11-01T23:23:27.996Z"
},
"resource": "https://us-tax-calc.x402tookit.com/retirement-limits",
"serviceName": "US Tax Calculators",
"tags": [
"tax",
"401k",
"ira",
"hsa",
"retirement"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "IRS retirement and HSA contribution limits by year: 401(k), IRA, catch-up, SIMPLE, HSA, with an age-adjusted personal limit."
}What the leaf hashes
{"body":"50637323b48c2d4de0766361a702075edf33a9bd8d2670e84fb882d534af099c","id":2201868,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646809957656,"prev":null,"subject":"x402_bazaar:https://us-tax-calc.x402tookit.com/retirement-limits","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).
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- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af