Marketplace · API · x402

voice.madebydevx.com/v1/stt

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.

Endpoint	`https://voice.madebydevx.com/v1/stt`
Trust	Not checked yet
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
network	eip155:8453
scheme	exact
pay to	0xB3cDDccEe6B150c8efFD55B961afc0Ecefe7f247
method	POST
last updated	2026-11-11T19:17:31.123Z

Use it

Call it (an x402 client pays automatically)

curl -i https://voice.madebydevx.com/v1/stt
# 402 reply -> sign PAYMENT-REQUIRED with an x402 client (e.g. @x402/fetch) -> retry with PAYMENT-SIGNATURE

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/x402-420013ab4a514348

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}