← The evidence ledger
Evidence row 123902
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://voice.madebydevx.com/v1/stt
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 29dd7a6a773b8dc7ad0dd2bda1bfdfd9e3f6c76f7aeb7e1a6415f7d30db7a022
- Leaf
- 0xd1c7c527cea3f31665606ff087dff80456f846c871ee764e71aaf34783c9ccce
What was observed
{
"endpoints": [
[
"x402",
"https://voice.madebydevx.com/v1/stt"
]
],
"name": "DevX Voice",
"owner_address": "0xe30c4544ec57ac44d8586eb49e49e267fc2d40db",
"raw": {
"accepts": [
{
"amount": "2000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
"scheme": "exact"
},
{
"amount": "2000",
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:137",
"payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
"scheme": "exact"
},
{
"amount": "2000",
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:42161",
"payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
"scheme": "exact"
},
{
"amount": "2000",
"asset": "0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9",
"extra": {
"name": "USD₮0",
"version": "1"
},
"maxTimeoutSeconds": 300,
"network": "eip155:42161",
"payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
"scheme": "exact"
},
{
"amount": "2000",
"asset": "0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:43114",
"payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
"scheme": "exact"
},
{
"amount": "2000",
"asset": "0x779Ded0c9e1022225f8E0630b35a9b54bE713736",
"extra": {
"name": "USD₮0",
"version": "1"
},
"maxTimeoutSeconds": 300,
"network": "eip155:196",
"payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
"scheme": "exact"
}
],
"description": "Speech to text for agents: send an audio URL, base64 or raw audio (WAV, MP3, FLAC, OGG, M4A, WebM; up to 20 min / 10 MB) and get the transcript, language, timed segments and WebVTT subtitles. Optional task=translate gives English text. $0.002 USDC per started minute on Base; failed or silent audio is not charged. Whisper large-v3-turbo. By DevX.",
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"audio_url": "https://voice.madebydevx.com/samples/hello.mp3",
"language": "en"
},
"bodyType": "json",
"discoverable": true,
"method": "POST",
"type": "http"
},
"output": {
"example": {
"operation_id": "6a1f0c7e-2b6d-4f7e-9d2a-0c5b8e1f4a33",
"payment": {
"amount_raw": "2000",
"network": "eip155:8453",
"status": "paid",
"tx_hash": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"result": {
"billed_minutes": 1,
"duration_seconds": 4.28,
"language": "en",
"model": "whisper-large-v3-turbo",
"segments": [
{
"end": 4.2,
"start": 0,
"text": "Hello from DevX voice. This is a short speech to text demo."
}
],
"task": "transcribe",
"text": "Hello from DevX voice. This is a short speech to text demo.",
"vtt": "WEBVTT\n\n00:00.000 --> 00:04.200\nHello from DevX voice. This is a short speech to text demo.",
"word_count": 11
},
"status": "paid"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"audio_base64": {
"description": "Base64 audio (max 6 MB decoded); a data: URI prefix is allowed",
"type": "string"
},
"audio_url": {
"description": "Public http(s) URL of the audio file (max 10 MB, 20 min)",
"type": "string"
},
"language": {
"description": "ISO 639-1 code like \"en\", or \"auto\" (default) to detect",
"type": "string"
},
"prompt": {
"description": "Optional context words/spelling hints",
"maxLength": 500,
"type": "string"
},
"requestKey": {
"description": "Optional idempotency key: the same payer + requestKey + input within 7 days returns the stored result without a second charge.",
"maxLength": 128,
"minLength": 8,
"pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]{7,127}$",
"type": "string"
},
"task": {
"description": "translate = English output",
"enum": [
"transcribe",
"translate"
],
"type": "string"
},
"vad": {
"description": "Voice activity detection pre-filter",
"type": "boolean"
}
},
"type": "object"
},
"bodyType": {
"enum": [
"json"
],
"type": "string"
},
"discoverable": {
"type": "boolean"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"operation_id": {
"type": "string"
},
"payment": {
"type": "object"
},
"result": {
"type": "object"
},
"status": {
"type": "string"
}
},
"required": [
"operation_id",
"status",
"result"
],
"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/v1792674330/bazaar-icons/e0e6fd42800bc2b7.png",
"lastUpdated": "2026-10-24T15:38:04.638Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-10-24T15:38:04.46Z"
},
"resource": "https://voice.madebydevx.com/v1/stt",
"serviceName": "DevX Voice",
"tags": [
"speech-to-text",
"stt",
"transcription",
"whisper",
"audio"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Speech to text for agents: send an audio URL, base64 or raw audio (WAV, MP3, FLAC, OGG, M4A, WebM; up to 20 min / 10 MB) and get the transcript, language, timed segments and WebVTT subtitles. Optional task=translate gives English text. $0.002 USDC per started minute on Base; failed or silent audio is not charged. Whisper large-v3-turbo. By DevX."
}What the leaf hashes
{"body":"29dd7a6a773b8dc7ad0dd2bda1bfdfd9e3f6c76f7aeb7e1a6415f7d30db7a022","id":123902,"kind":"listing","method":"baseline/1","observed_us":1793025623849140,"prev":null,"subject":"x402_bazaar:https://voice.madebydevx.com/v1/stt","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).
- 0xd1c7a25311eab5df95b68e38e8853ad982a2e0ea926b3be1bc571619218ff690
- 0x8538b09e4722c88a8d034ff9975e76c314d1d916879f2b4ef301e22f0601d3f5
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- 0x1ff92d0be2e1abee65c13b16d6b3aa8f0038e26ee4317de7ad3f4b5b5c021f04
- 0x69cdf871d83b4489cb489d9a2503e8c04fcea425eadf1a681a897b16a9ec998d
- 0x999aecc89abb75f27a11ad081da38dc68669aa704e3c715b9e407429a86bcc58
- 0x0a5cf8be3edae8e939f93555b37ebcf1c98518d65ebf13e7af9f21f0bd988625
- 0x6caf1de894c224cf8286845ce6a6248ec0324d830ead1f0b5dd9b2a8da5ccc5f
- 0x4150589061b30d291e7235f1a994be8740c3c22358057bceadb9de1f7a4e886b
- 0xd03ba161f40c51580284bcf2e65fb1818a9cf130ec62c36d7043b982e4e3abee
- 0xf2fdee89378769052782dfd25aeff4865ec268617aa70e6d5f36f0b04808af0c
- 0xa4ec009cd8db00b48fa2e4df84088950b4d34c37254de09f5e3789441c0c5e73
- 0x889eefefef2d4457fe6114f397df813a5cbb85011a6f40309b54ddcd4aba3bd1
- 0xefabf1105e09cf52c12c58e60cbb5048b9ac3f02631d1816a926e14bdd86fbdf
- 0xe94ca5b798e9899ad611e57835af42266e20f53f44977e487d81365e30972beb
- 0x703f95866af09c5e5d6ead7411e9a10f964a41a2aff64d4a55ff0053c023a023
- 0xd0651cb9bc8155eb52b5247d506e74b8a935057dc190ba52091702ac25ed3a40
- 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae