← The evidence ledger
Evidence row 125416
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://x402-retire-git-feat-paid-indexing-gate-and-openapi-carbonmark.vercel.app/api/catalog
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 52306f80465620df5ae0c4b52b95f280a85ef422697efdcc8804a25ea10a0e96
- Leaf
- 0x477782a2116fe5a103af2e9abff1a346632ddb7f4e33d313ce2e5c836b77b012
What was observed
{
"endpoints": [
[
"x402",
"https://x402-retire-git-feat-paid-indexing-gate-and-openapi-carbonmark.vercel.app/api/catalog"
]
],
"name": "Klima Retirement Aggregator",
"owner_address": "0xf624f9fe1d3165c5ca32c7fbdbf82f4a5b1d2d0e",
"raw": {
"accepts": [
{
"amount": "1000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xf624f9Fe1D3165c5Ca32c7Fbdbf82f4a5b1D2d0e",
"scheme": "exact"
}
],
"description": "Live snapshot of the most liquid carbon credits retirable on Base: the top 3 Klima Protocol carbon classes and the top 3 Carbonmark marketplace listings, with USDC-per-tonne prices and tonnes available. Additionally, the additional endpoints to quote and retire carbon are included; query those endpoints for further discovery, quotes, and retirements. Query /.well-known, /openapi, and /discover to get started.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-09-15T00:00:00.000Z",
"classes": [],
"endpoints": {
"actionsRetire": "https://x402.klimalabs.com/api/actions/retire",
"certificate": "https://x402.klimalabs.com/api/certificate",
"discover": "https://x402.klimalabs.com/api/discover",
"openapi": "https://x402.klimalabs.com/openapi.json",
"prepareAuth": "https://x402.klimalabs.com/api/prepare-auth",
"prepareRetire": "https://x402.klimalabs.com/api/prepare/retire",
"quote": "https://x402.klimalabs.com/api/quote"
},
"listings": [],
"note": "Prices are USDC per tonne before the on-chain protocol fee. Class prices are indicative live quotes; listing prices are the seller's firm ask. To retire: GET quote, then either GET prepare/retire and send the transactions from your own wallet, or GET prepare-auth, sign its typedData and POST actions/retire. None of those charge an API fee. GET discover returns the full catalog for free."
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"additionalProperties": false,
"properties": {},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"asOf": {
"type": "string"
},
"classes": {
"items": {
"additionalProperties": false,
"properties": {
"carbonClassId": {
"type": "string"
},
"category": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"country": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"creditCount": {
"type": "number"
},
"liquidityTonnes": {
"type": "string"
},
"name": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"priceBasis": {
"const": "indicative",
"type": "string"
},
"priceUsdcPerTonne": {
"type": "string"
},
"priceUsdcPerTonneFormatted": {
"type": "string"
}
},
"required": [
"carbonClassId",
"name",
"category",
"country",
"priceUsdcPerTonne",
"priceUsdcPerTonneFormatted",
"priceBasis",
"liquidityTonnes",
"creditCount"
],
"type": "object"
},
"type": "array"
},
"endpoints": {
"additionalProperties": false,
"properties": {
"actionsRetire": {
"type": "string"
},
"certificate": {
"type": "string"
},
"discover": {
"type": "string"
},
"openapi": {
"type": "string"
},
"prepareAuth": {
"type": "string"
},
"prepareRetire": {
"type": "string"
},
"quote": {
"type": "string"
}
},
"required": [
"discover",
"quote",
"prepareRetire",
"prepareAuth",
"actionsRetire",
"certificate",
"openapi"
],
"type": "object"
},
"listings": {
"items": {
"additionalProperties": false,
"properties": {
"category": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"country": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"creditId": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"expiresAt": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"leftToSellTonnes": {
"type": "string"
},
"listingId": {
"type": "string"
},
"minFillTonnes": {
"type": "string"
},
"priceBasis": {
"const": "firm",
"type": "string"
},
"priceUsdcPerTonne": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"priceUsdcPerTonneFormatted": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"projectName": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"registry": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"vintage": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
]
}
},
"required": [
"listingId",
"projectName",
"creditId",
"registry",
"vintage",
"country",
"category",
"priceUsdcPerTonne",
"priceUsdcPerTonneFormatted",
"priceBasis",
"leftToSellTonnes",
"minFillTonnes",
"expiresAt"
],
"type": "object"
},
"type": "array"
},
"note": {
"type": "string"
}
},
"required": [
"asOf",
"classes",
"listings",
"endpoints",
"note"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-10-24T02:00:53.827Z",
"quality": {
"l30DaysTotalCalls": 4,
"l30DaysUniquePayers": 4,
"lastCalledAt": "2026-10-24T02:00:53.676Z"
},
"resource": "https://x402-retire-git-feat-paid-indexing-gate-and-openapi-carbonmark.vercel.app/api/catalog",
"serviceName": "Klima Retirement Aggregator",
"tags": [
"carbon",
"climate",
"base"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Live snapshot of the most liquid carbon credits retirable on Base: the top 3 Klima Protocol carbon classes and the top 3 Carbonmark marketplace listings, with USDC-per-tonne prices and tonnes available. Additionally, the additional endpoints to quote and retire carbon are included; query those endpoints for further discovery, quotes, and retirements. Query /.well-known, /openapi, and /discover to get started."
}What the leaf hashes
{"body":"52306f80465620df5ae0c4b52b95f280a85ef422697efdcc8804a25ea10a0e96","id":125416,"kind":"listing","method":"baseline/1","observed_us":1793025626168811,"prev":null,"subject":"x402_bazaar:https://x402-retire-git-feat-paid-indexing-gate-and-openapi-carbonmark.vercel.app/api/catalog","subject_kind":"source_record"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (296695 rows).
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- 0x9be2382d8bbb94ce9895d790b50a56a75c2e301ce9b18bfe9c1bdd3b5bbe014a
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- 0x346a0f30d0936d0fc8594ace088b6135fa725d20e6658b351887fbc53cf2be3c
- 0xeb5ac4ced5f73d70e0c4a3cd1ffcfde6c2c62b154094003a739029cdd06d4d76
- 0x808500243c9e40261a62cde7208acff22a0c2535e43753abe372e06aea5555b3
- 0x726b9406fc32b7caa77379b07cd192bb19566fe59071714e9c06f97df9d0e61d
- 0x9f42dbb02295635e04223e4a7dac5552fc990eefdd9476cc0141288133086af6
- 0x67d81f51788e4acdc8f36ca9346a133b005814670585625cf73534b4509e188a
- 0x263cc8bcddc70acc00ef06b84397a006a822410dc2b18b714a0be72a820c5b17
- 0xae3550e71ca4b0f0b86c9905b234388d6bc01a22e52324fb1ee62a553273a1fe
- 0xb86fa861d04737cb507e721eefbb066d26528fdb6017b1145c18d1223b93ee21
- 0x88e326a39b26e2c125306c9d3805d14398ace088bba9a2a0aa376b811cfb201a
- 0x2be1e80e065dd6b2cc75a7142be22225acd144ac975d70bf24b4f01fd76dc497
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- 0x9a83be955a206deb65b995adfd92c58fa31c95fbbf926bd199d300e70b08b26d
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- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae