payment-ready until 2026-08-20
Send audio as base64 bytes in the request body, or as an https URL, and get back the transcript, ready-made WebVTT subtitles, and an editor's cut list marking every stretch of dead air and how much shorter the result would be. Flat $0.02 per request, whatever the file — no per-MB component. Sources up to 800 KB: base64 is measured decoded, a URL is measured from the source's own content-length rather than anything the caller declares. No account, no API key and no upload step — if you are holding the audio, you can buy. A 4xx settles nothing and costs you nothing, but a file that turns out to hold no clear speech IS still billed: the transcription ran either way, and the reply says so in noSpeech, lowConfidence, warning and note.
Pay from $0.02 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
first settlement 2026-07-29 · $0.06 all-time · settled via payAI
ASSESSMENT
updated 1h agoEvidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.
reliability 99.6%
- uptime 24h
- 100%
- uptime 7d
- 100%
- uptime 30d
- 99.6%
- uptime 90d
- 99.6%
- response p95
- 1788ms
- avg response
- 1394ms
- total checks
- 1,435
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance A (14/14)
14 of 14 x402 conformance checks pass. Full checklist below.
price $0.02 (p57 in AI)
- price (min)
- $0.02
- category percentile (min)
- p57 in AI
- endpoints / prices
- 1 / 1
- model
- flat
- stability
- 0%
risk clean
No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.
- domain age
- 151d
- registrar
- -
- hosting
- custom
- domain created
- 2026-03-13
Identity facts, not a risk score.
traction $0.068 30d · 2 buyers
- volume 30d
- $0.068
- buyers 30d
- 2
- settlements 30d
- 7
- first settlement
- 2026-07-29
- last settlement
- 2026-08-12
- top buyer share
- 71% of 30d volume
- trend 7d vs 30d
- 0.13x the 30d daily rate
- networks
- eip155:8453
- volume all-time
- $0.06
- settlements all-time
- 7
- median settlement 30d
- $0.002
- max settlement 30d
- $0.02
- settled via
- payAI ($0.07, 7 tx)
Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.
Top buyer share is a concentration signal, not part of the ranking score.
CHANGES
2 events, detecting since 2026-07-24Payout, price, and schema changes detected on this service's x402 wire. A payout rotation at an unchanged price shows up here even when nothing else moves. Full feed at /changes.
changes price changed 15d ago (2 since 2026-07-24)
price changed · 15d ago
POST /transcribe · eip155:8453 · USDC: 90000 → 20000
schema changed · 16d ago
schema removed POST /transcribe exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 1 application/json
schema added POST /transcribe exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 2
Amounts are on-wire atomic units in the named asset.
WHAT IT DOES
ai-derivedTranscribes audio or video files into text, subtitles, and a cut list marking dead air
- category
- audio-transcription
- in
- body
- auth
- none
AI-generated summary. The measured data is never altered by it.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| POST | /transcribe | Transcribe an audio or video URL. Returns the transcript, ready-made WebVTT subtitles, and an editor's cut list marking every stretch of dead air and how much shorter the result would be. One flat price, $0.0900 per request, whatever the file. Sources up to 3 MB. A file that turns out to hold no clear speech is still billed — the transcription ran. | $0.02 | Base | USDC | header |
REQUEST / RESPONSE EXAMPLE
An unpaid request to POST /transcribe returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i -X POST 'https://transcribe.soboljem.cz/transcribe'
// 402 response (captured by monitor) · 1 payload · click to expand
[
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xA0c79739Bc6214dA2a33978d5B9A86f42fd230bD",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://transcribe.soboljem.cz/transcribe",
"mimeType": "application/json",
"description": "Transcribe an audio or video URL. Returns the transcript, ready-made WebVTT subtitles, and an editor's cut list marking every stretch of dead air and how much shorter the result would be. One flat price, $0.0200 per request, whatever the file. Sources up to 800 KB. A file that turns out to hold no clear speech is still billed — the transcription ran."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"url": {
"type": "string",
"required": false,
"description": "https URL of an audio or video file, up to 800 KB (measured from the source's content-length, not declared by you). Send this OR audio."
},
"audio": {
"type": "string",
"required": false,
"description": "the audio itself, base64 encoded (a data: URI is fine), up to 800 KB decoded. Use this if you are holding the file — it needs no hosting, no account and no second request. Send this OR url."
},
"language": {
"type": "string",
"required": false,
"description": "optional ISO hint such as \"en\" or \"cs\"; omit to auto-detect"
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"vtt": "WEBVTT\n\n00:00.000 --> 00:02.400\nso anyway, that is the whole idea",
"cuts": [
{
"to": 5.1,
"from": 2.4,
"reason": "silence",
"seconds": 2.7
}
],
"text": "so anyway, that is the whole idea",
"stats": {
"sourceSeconds": 12,
"speechSeconds": 9.3,
"wouldSavePercent": 22.5
},
"language": "en",
"wordCount": 8
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"properties": {}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}
] OVER TIME
All charts use the 24h selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/transcribe-audio-to-transcript-subtitles-and-a-cut-list/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.
checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression
Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.
COMPLIANCE
14/14 checks pass · grade Alast 402 captured 2026-07-29 · last up 2026-08-13
- 402 payload captured
- accepts[] array present
- payTo address recoverable
- payTo at accepts[0].payTo (conformant shape)
- payTo is a valid on-chain address
- atomic price declared
- atomic price in a sane range
- asset (token) address declared
- network resolves to CAIP-2
- payment scheme declared
- served over HTTPS
- declares the current x402 version (2)
- EIP-712 domain parameters present on every EVM entry
- x402 v2 envelope delivered in the payment-required header
SITE PILLARS
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
recent checks (18) live · click to expand
EMBED THIS BADGE
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