Index onlineMerchant portal
Api Endpoint

Speech-to-text (Whisper v3)

Speech-to-text (OpenAI-compatible /v1/audio/transcriptions, multipart). Whisper large-v3-turbo, 100 languages, verbose_json with segment timestamps + duration. wav/mp3 up to 5 min / 12 MB. $0.003 USDC per minute (Telnyx list rate, zero margin), metered per second via the upto scheme (min $0.002 network floor ≈ 40s), or flat $0.015 exact.

Open interactive test console

Offering

Provider
x402.telnyx.com
Method
POST
Offering type
Api Endpoint
Transport type
http
Category
Creative
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://x402.telnyx.com/v1/audio/transcriptions
MIME type
Not provided
First seen
2026-10-16T01:50:19.913Z
Last seen
Tags
AI, speech-to-text, transcription, audio, telnyx

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.015 USDC
Atomic price: 15000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2
0.015 USDC
Atomic price: 15000 · Network: eip155:8453 · Asset: USDC · Scheme: upto
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "15000",
    "payTo": "0x19a78B27a28eD93C3c914878bde7f2f843AfAEa8"
  },
  {
    "scheme": "upto",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "15000",
    "payTo": "0x19a78B27a28eD93C3c914878bde7f2f843AfAEa8"
  }
]

Observed health

Status
Healthy
Latest latency
83 ms
Average latency
183 ms
HTTP status
200
Last checked
Reachability
100% over 13 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "additionalProperties": false,
  "properties": {
    "body": {
      "properties": {
        "file": {
          "description": "Audio file (multipart part named \"file\"): wav or mp3, ≤5 minutes, ≤12 MB.",
          "type": "string"
        },
        "language": {
          "description": "Optional ISO-639-1 hint.",
          "type": "string"
        },
        "model": {
          "description": "All aliases run openai/whisper-large-v3-turbo.",
          "enum": [
            "whisper-1",
            "whisper-large-v3-turbo",
            "openai/whisper-large-v3-turbo"
          ],
          "type": "string"
        },
        "prompt": {
          "maxLength": 1024,
          "type": "string"
        },
        "response_format": {
          "enum": [
            "json",
            "verbose_json"
          ],
          "type": "string"
        },
        "temperature": {
          "maximum": 1,
          "minimum": 0,
          "type": "number"
        },
        "timestamp_granularities": {
          "description": "Segment-level only (upstream does not support word).",
          "items": {
            "enum": [
              "segment"
            ],
            "type": "string"
          },
          "type": "array"
        }
      },
      "required": [
        "file"
      ],
      "type": "object"
    },
    "bodyType": {
      "enum": [
        "json",
        "form-data",
        "text"
      ],
      "type": "string"
    },
    "method": {
      "enum": [
        "POST"
      ],
      "type": "string"
    },
    "type": {
      "const": "http",
      "type": "string"
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "type": "object"
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "body": {
          "properties": {
            "file": {
              "description": "Audio file (multipart part named \"file\"): wav or mp3, ≤5 minutes, ≤12 MB.",
              "type": "string"
            },
            "language": {
              "description": "Optional ISO-639-1 hint.",
              "type": "string"
            },
            "model": {
              "description": "All aliases run openai/whisper-large-v3-turbo.",
              "enum": [
                "whisper-1",
                "whisper-large-v3-turbo",
                "openai/whisper-large-v3-turbo"
              ],
              "type": "string"
            },
            "prompt": {
              "maxLength": 1024,
              "type": "string"
            },
            "response_format": {
              "enum": [
                "json",
                "verbose_json"
              ],
              "type": "string"
            },
            "temperature": {
              "maximum": 1,
              "minimum": 0,
              "type": "number"
            },
            "timestamp_granularities": {
              "description": "Segment-level only (upstream does not support word).",
              "items": {
                "enum": [
                  "segment"
                ],
                "type": "string"
              },
              "type": "array"
            }
          },
          "required": [
            "file"
          ],
          "type": "object"
        },
        "bodyType": {
          "enum": [
            "json",
            "form-data",
            "text"
          ],
          "type": "string"
        },
        "method": {
          "enum": [
            "POST"
          ],
          "type": "string"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method",
        "bodyType",
        "body"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}