← The evidence ledger
Evidence row 19386
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://voice.madebydevx.com/v1/tts
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- eecb64571ae29e8198c728cac3f1c4e1bd7367a2e883d8b787a80ec5e9bf5350
- Leaf
- 0xf4289c883600aed0f03ac58829a0b42d83ce1aa4887af7a263dd273586cbfe7f
What was observed
{
"endpoints": [
[
"x402",
"https://voice.madebydevx.com/v1/tts"
]
],
"name": "DevX Voice",
"owner_address": "0xe30c4544ec57ac44d8586eb49e49e267fc2d40db",
"raw": {
"accepts": [
{
"amount": "1000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
"scheme": "exact"
},
{
"amount": "1000",
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:137",
"payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
"scheme": "exact"
},
{
"amount": "1000",
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:42161",
"payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
"scheme": "exact"
},
{
"amount": "1000",
"asset": "0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9",
"extra": {
"name": "USD₮0",
"version": "1"
},
"maxTimeoutSeconds": 300,
"network": "eip155:42161",
"payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
"scheme": "exact"
},
{
"amount": "1000",
"asset": "0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:43114",
"payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
"scheme": "exact"
},
{
"amount": "1000",
"asset": "0x779Ded0c9e1022225f8E0630b35a9b54bE713736",
"extra": {
"name": "USD₮0",
"version": "1"
},
"maxTimeoutSeconds": 300,
"network": "eip155:196",
"payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
"scheme": "exact"
}
],
"description": "Text to speech for agents: send text (up to 2,000 chars) in English, Spanish, French, Chinese, Japanese or Korean and get a WAV voice clip (base64 in JSON, or raw audio/wav with response_format=wav). $0.001 USDC per started 1,000 characters on Base; failures are not charged. Accepts dTelecom-style text/lang_code fields. MeloTTS. By DevX.",
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"lang": "en",
"text": "Hello from DevX Voice."
},
"bodyType": "json",
"discoverable": true,
"method": "POST",
"type": "http"
},
"output": {
"example": {
"operation_id": "0d7c1f8a-5e2b-4a9c-8f3d-1b6e2c9a7d40",
"payment": {
"amount_raw": "1000",
"network": "eip155:8453",
"status": "paid",
"tx_hash": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"result": {
"audio_base64": "UklGRl7xAABXQVZFZm10IBAAAAABAAEARKwAAIhYAQACABAAZGF0YQ...",
"billed_units": 1,
"characters": 22,
"duration_seconds": 1.6,
"language": "en",
"mime": "audio/wav",
"model": "melotts",
"sample_rate": 44100,
"voice": "melotts-default"
},
"status": "paid"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"lang": {
"description": "Language (default en). Aliases: language, lang_code (dTelecom/Kokoro letters a, b, e, f, j, z)",
"enum": [
"en",
"es",
"fr",
"zh",
"ja",
"ko"
],
"type": "string"
},
"lang_code": {
"type": "string"
},
"language": {
"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"
},
"response_format": {
"description": "json (default): base64 WAV inside JSON; wav: raw audio/wav body",
"enum": [
"json",
"wav"
],
"type": "string"
},
"speed": {
"enum": [
1
],
"type": "number"
},
"text": {
"description": "Text to speak (max 2,000 characters)",
"maxLength": 2000,
"minLength": 1,
"type": "string"
},
"voice": {
"enum": [
"default"
],
"type": "string"
}
},
"required": [
"text"
],
"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": "2026-10-26T02:18:08.829Z",
"quality": {
"l30DaysTotalCalls": 11,
"l30DaysUniquePayers": 6,
"lastCalledAt": "2026-10-26T11:54:41.783Z"
},
"resource": "https://voice.madebydevx.com/v1/tts",
"serviceName": "DevX Voice",
"tags": [
"text-to-speech",
"tts",
"speech",
"voice",
"audio"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Text to speech for agents: send text (up to 2,000 chars) in English, Spanish, French, Chinese, Japanese or Korean and get a WAV voice clip (base64 in JSON, or raw audio/wav with response_format=wav). $0.001 USDC per started 1,000 characters on Base; failures are not charged. Accepts dTelecom-style text/lang_code fields. MeloTTS. By DevX."
}What the leaf hashes
{"body":"eecb64571ae29e8198c728cac3f1c4e1bd7367a2e883d8b787a80ec5e9bf5350","id":19386,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793025331612098,"prev":null,"subject":"x402_bazaar:https://voice.madebydevx.com/v1/tts","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).
- 0xf42883a08468cd1311b63c0ad872a21921d141e331011e09f67190e7701cc52a
- 0x7ef515a5a592dda3d329c1d08bfb6739917b146179db4bc1c3a5f2022e8a6da4
- 0xe067c6d320c352d768271b74f7dc14304b52fc2d94a3e8ec32bb10bb4ff9120f
- 0x223ec7d37f0c38207a8e7e8e7f85348865411028570d7495dd86deb384cf717c
- 0xde54a18b0cbce109908a4e746c77c093b92bc34cb96dc58203750ead1254364c
- 0x62088acffb7428a757d2d0a5a5ac25de0122c851526475e9727a00aa3c3e2642
- 0x4e17f184af83d4cd0325e9d244aed8e12487345713eb3af774ef1cf8e4bf3b95
- 0x7446c30f8f85012d898dba794bd17bdbf35b492377011df03a56fd87ae172a44
- 0xbb4718fd976bfd59f0712e3e7e76688ff4f4ecf8fe3b35be5a4d32ac65bf8af7
- 0x2975e89c0c18a450c0bfde2c42c4c92b23bf147f75afffe0dee4f9c66939c8bf
- 0x07709318feb0c1102a4f704a544c82a5c58ec388fbdac0965060c1f5091cc976
- 0x86ae35463d854f3938d986999aa8497e14f0ba2aa6f39a269e1e6d1134f9b847
- 0x79695e4356ea25a2b58265a824698704cd2c743099ce2dca9e41384ce8f1a8c5
- 0xd769d41500075835c3b2f9184d223699fb983fd05c29fbcb44d964abc7ee380d
- 0x68d296b1e00b4899fb83c3fba36fffaefa311eac2903067dbebfe776a12b4a9a
- 0x5fb5dda563336cd1bc1b9f44c52b76237ae72ed2145cb9290f39f304ca7dd678
- 0x74a0a08e4e7ab9aa5bfbead33dec7e1c7e8e364cff69a63720d764bbe987aadc
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae