x402 List

x402 Protocol Service Directory

Transcribe — audio to transcript, subtitles and a cut list

AI PAYMENT-READY

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

BASE URL https://transcribe.soboljem.cz WEBSITE https://transcribe.soboljem.cz ENDPOINTS 1 NETWORK Base ASSET USDC MEMBER SINCE 2026-07-28 MONITORED SINCE 2026-07-28

ASSESSMENT

updated 12m ago

Evidence-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.

jump to compliance checklist

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 2026-07-24

Payout, 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: 9000020000

schema changed · 15d 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.

see all changes for this service

WHAT IT DOES

ai-derived

Transcribes audio or video files into text, subtitles, and a cut list marking dead air

category
audio-transcription
in
body
auth
none
transcriptionsubtitlesaudio-processingvideo-processing

AI-generated summary. The measured data is never altered by it.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
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
1 endpoints

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.

// request
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 30d 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.

UPTIME
07-28 · uptime 100.0% · 674ms avg07-29 · uptime 97.8% · 951ms avg07-30 · uptime 97.8% · 1464ms avg07-31 · uptime 100.0% · 1227ms avg08-01 · uptime 100.0% · 1174ms avg08-02 · uptime 98.9% · 1393ms avg08-03 · uptime 100.0% · 1151ms avg08-04 · uptime 98.9% · 1454ms avg08-05 · uptime 100.0% · 1569ms avg08-06 · uptime 100.0% · 1724ms avg08-07 · uptime 100.0% · 1705ms avg08-08 · uptime 100.0% · 1903ms avg08-09 · uptime 100.0% · 1998ms avg08-10 · uptime 100.0% · 1515ms avg08-11 · uptime 100.0% · 1039ms avg08-12 · uptime 100.0% · 1033ms avg08-13 · uptime 100.0% · 1107ms avg07-2808-13
30d UPTIME 99.6%
RESPONSE TIME
07-28 · 674ms avg07-28 · 674ms avg07-29 · 951ms avg07-29 · 951ms avg07-30 · 1464ms avg07-30 · 1464ms avg07-31 · 1227ms avg07-31 · 1227ms avg08-01 · 1174ms avg08-01 · 1174ms avg08-02 · 1393ms avg08-02 · 1393ms avg08-03 · 1151ms avg08-03 · 1151ms avg08-04 · 1454ms avg08-04 · 1454ms avg08-05 · 1569ms avg08-05 · 1569ms avg08-06 · 1724ms avg08-06 · 1724ms avg08-07 · 1705ms avg08-07 · 1705ms avg08-08 · 1903ms avg08-08 · 1903ms avg08-09 · 1998ms avg08-09 · 1998ms avg08-10 · 1515ms avg08-10 · 1515ms avg08-11 · 1039ms avg08-11 · 1039ms avg08-12 · 1033ms avg08-12 · 1033ms avg08-13 · 1107ms avg08-13 · 1107ms avg07-2808-13
AVG RESP 1393ms
PRICE (captured 402, USD)
07-28 · $0.0907-29 · $0.0208-13 · $0.02$0.0207-2808-13
SUB-SCORES (uptime + x402 compliance)
07-28 uptime: 100.0% compliance: 93% checks07-29 uptime: 99.1% compliance: 100% checks07-30 uptime: 97.8% compliance: 100% checks07-31 uptime: 98.6% compliance: 100% checks08-01 uptime: 98.9% compliance: 100% checks08-02 uptime: 98.9% compliance: 100% checks08-03 uptime: 99.1% compliance: 100% checks08-04 uptime: 99.1% compliance: 100% checks08-05 uptime: 99.2% compliance: 100% checks08-06 uptime: 99.3% compliance: 100% checks08-07 uptime: 99.4% compliance: 100% checks08-08 uptime: 99.4% compliance: 100% checks08-09 uptime: 99.4% compliance: 100% checks08-10 uptime: 99.5% compliance: 100% checks08-11 uptime: 99.5% compliance: 100% checks08-12 uptime: 99.6% compliance: 100% checks08-13 uptime: 99.6% compliance: 100% checksuptimecompliance07-2808-13

checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression

PILLARS OVER TIME (measured)

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.

VOLUME (on-chain settlement, USD)
07-29 · $0.0207-31 · $0.0208-01 · $0.0008-03 · $0.0208-12 · $0.00peak $0.0207-2908-12
DISTINCT BUYERS
07-29 · 1 buyer07-31 · 1 buyer08-01 · 1 buyer08-03 · 1 buyer08-12 · 1 buyerpeak 1 buyer07-2908-12

COMPLIANCE

14/14 checks pass · grade A

last 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
TIME STATUS RESP CAUSE
● OK 282ms
● OK 874ms
● OK 1388ms
● OK 1099ms
● OK 583ms
● OK 1089ms
● OK 1726ms
● OK 1345ms
● OK 674ms
● OK 1024ms
● OK 706ms
● OK 1283ms
● OK 749ms
● OK 701ms
● OK 1548ms
● OK 1096ms
● OK 519ms
● OK 474ms

EMBED THIS BADGE

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Transcribe — audio to transcript, subtitles and a cut list listed on x402-list
status
Transcribe — audio to transcript, subtitles and a cut list uptime on x402-list
live uptime
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// HTML · live uptime variant
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