← The evidence ledger
Evidence row 18523
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://ask.singitai.app/v1/exa/answer
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 03417b2dad0e23285e76584a938f4dbcb3954fe8e88f75d355dc6754299d4af7
- Leaf
- 0x4e668292b576034fc3872411830805dcc8df46c52ccf0685d4efe74c7a7fd312
What was observed
{
"endpoints": [
[
"x402",
"https://ask.singitai.app/v1/exa/answer"
]
],
"name": "SingIt Ask",
"owner_address": "0xc23d1dc0f5fce1abffb051e06cb93f0329968b4e",
"raw": {
"accepts": [
{
"amount": "7500",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 120,
"network": "eip155:8453",
"payTo": "0xC23d1Dc0f5fCe1abfFB051e06cB93f0329968B4e",
"scheme": "exact"
},
{
"amount": "8500",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "4an2sqamWWhny9mjLsMtGXCDXakeNtg6vSLq4QvhdmQu",
"scheme": "exact"
}
],
"description": "SingIt Search: A cited answer to a question, from Exa. Call it when an agent needs a sourced answer rather than raw search results, with no API key or account.",
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"query": "What is x402?"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"answer": "x402 is an open standard for paying for an API call with a stablecoin over HTTP 402.",
"billing": {
"currency": "USDC",
"exaAtomic": "5000",
"feeAtomic": "1000",
"markupAtomic": "1500",
"totalAtomic": "7500"
},
"citations": [
{
"id": "https://x402.org",
"title": "x402",
"url": "https://x402.org"
}
]
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"model": {
"enum": [
"exa",
"exa-fast"
],
"type": "string"
},
"query": {
"description": "The question to answer with citations.",
"maxLength": 2000,
"minLength": 1,
"type": "string"
},
"systemPrompt": {
"description": "Guidance for the answer's style.",
"type": "string"
},
"text": {
"description": "Include the text of the cited pages.",
"type": "boolean"
},
"userLocation": {
"description": "Two-letter country code.",
"type": "string"
}
},
"required": [
"query"
]
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"billing": {
"description": "What was charged, in USDC micro-units",
"properties": {
"currency": {
"const": "USDC",
"type": "string"
},
"exaAtomic": {
"type": "string"
},
"feeAtomic": {
"type": "string"
},
"markupAtomic": {
"type": "string"
},
"totalAtomic": {
"description": "The amount settled",
"type": "string"
}
},
"type": "object"
}
},
"required": [
"billing"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1792921332/bazaar-icons/a240c598b3f928d1.png",
"lastUpdated": "2026-10-26T05:40:59.165Z",
"quality": {
"l30DaysTotalCalls": 4,
"l30DaysUniquePayers": 4,
"lastCalledAt": "2026-10-26T05:40:58.617Z"
},
"resource": "https://ask.singitai.app/v1/exa/answer",
"serviceName": "SingIt Ask",
"tags": [
"search",
"web-search",
"exa",
"answers",
"citations"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "SingIt Search: A cited answer to a question, from Exa. Call it when an agent needs a sourced answer rather than raw search results, with no API key or account."
}What the leaf hashes
{"body":"03417b2dad0e23285e76584a938f4dbcb3954fe8e88f75d355dc6754299d4af7","id":18523,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793025329287740,"prev":null,"subject":"x402_bazaar:https://ask.singitai.app/v1/exa/answer","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).
- 0x4e665bdd458339b908271dad1de148b34bd8f4bb0e54db6ee1d7495cc9ab53da
- 0x857d126b4bf8d490b9ed0c2c910a22d5ba7491cbf64d46875801cddec39729d9
- 0x97021d6ad728fcc4420faf08c52cebabff6f45d9ae45ef6cd213ed8a837aa62c
- 0xd17de10fcc21b92bdb25192decc4310d890e6214f4d3d31b87d1c026b6dd998b
- 0x8d4f8d60889ec126f4dab6c36e0f82a7f7bc70f5fa97930ab37b1f6b1ad250a6
- 0x75418d2f600d9827e0a30052c75211fc905dca2c3c9c796477a5f8d28ff555c8
- 0xb8c7c1edee3d8caf4e81a626800a64c75b1d9a1d5d33dd9ec3f2ce3c4b95fb99
- 0x90649b803db853c53bca7036e49ddeca07f32f7577e4564b3a9f982ad1adbe64
- 0x65ec2c65d018d2cd6b58df339fc0f0ab50ee700eb308a8ebb898a4fb3d28e81c
- 0x4e3a378d46fb644a540765cb2a75611ba24be0dbb514229e14d4860c2c09f3dd
- 0x20ba86fd56bddd46212d02e792b969e90a1167c4fb9ba4a54cb7da5cf7da1629
- 0xaf14a84837a57dc5a0cb0ebd158daaad24c19301b9257d9e97c322a7d8c54bc0
- 0xf7d2cf278e5d2768b8bdb70730c378877cf7165d8efcbec8bcd3282fdc50d177
- 0x0733993143f0230e79482cef2c38e95d98f9eafbe64a43cdc74a4545938a4167
- 0x2be1e80e065dd6b2cc75a7142be22225acd144ac975d70bf24b4f01fd76dc497
- 0x2e6a32eb32761c210560e852405e2f865f958ddbe01027894f8b9c1b3433b9f0
- 0x9a83be955a206deb65b995adfd92c58fa31c95fbbf926bd199d300e70b08b26d
- 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae