DevX Voice

Name: DevX Voice
Price: 0.001 USDC
Availability: InStock

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.

MediaLiveeip155:8453Exactvia cdp

https://voice.madebydevx.com/v1/tts

Text-to-speechTtsSpeechVoiceAudio

Calls · 30d

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 6 snapshots so far.

$0.12

Verified settled volume

25 settlements proven x402 by their on-chain EIP-3009 marker.

$0.0010

Listed price

As published in the catalog. Always read the live 402 before paying.

Calls · 30d

Upstream's own call count for this endpoint, not ours.

Unique payers · 30d

Last called 2026-10-26 11:54Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "PAYMENT-SIGNATURE header is required",
  "status": "payment_required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xe30c4544eC57ac44d8586eB49e49e267fc2d40DB",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "message": "POST JSON to https://voice.madebydevx.com/v1/tts; the 402 quote is computed from your input. Docs: https://voice.madebydevx.com/llms.txt",
  "resource": {
    "url": "https://voice.madebydevx.com/v1/tts",
    "tags": [
      "text-to-speech",
      "tts",
      "speech",
      "voice",
      "audio",
      "wav",
      "melotts",
      "agents",
      "multilingual"
    ],
    "iconUrl": "https://madebydevx.com/icon-512-v2.png",
    "mimeType": "application/json",
    "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). $0.001 USDC per started 1,000 characters on Base; failures are not charged. Accepts dTelecom-style text/lang_code fields. MeloTTS. By DevX.",
    "serviceName": "DevX Voice"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "lang": "en",
            "text": "Hello from DevX Voice."
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json",
          "discoverable": true
        },
        "output": {
          "type": "json",
          "example": {
            "result": {
              "mime": "audio/wav",
              "model": "melotts",
              "voice": "melotts-default",
              "language": "en",
              "characters": 22,
              "sample_rate": 44100,
              "audio_base64": "UklGRl7xAABXQVZFZm10IBAAAAABAAEARKwAAIhYAQACABAAZGF0YQ...",
              "billed_units": 1,
              "duration_seconds": 1.6
            },
            "status": "paid",
            "payment": {
              "status": "paid",
              "network": "eip155:8453",
              "tx_hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
              "amount_raw": "1000"
            },
            "operation_id": "0d7c1f8a-5e2b-4a9c-8f3d-1b6e2c9a7d40"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "required": [
                  "text"
                ],
                "properties": {
                  "lang": {
                    "enum": [
                      "en",
                      "es",
                      "fr",
                      "zh",
                      "ja",
                      "ko"
                    ],
                    "type": "string",
                    "description": "Language (default en). Aliases: language, lang_code (dTelecom/Kokoro letters a, b, e, f, j, z)"
                  },
                  "text": {
                    "type": "string",
                    "maxLength": 2000,
                    "minLength": 1,
                    "description": "Text to speak (max 2,000 characters)"
                  },
                  "speed": {
                    "enum": [
                      1
                    ],
                    "type": "number"
                  },
                  "voice": {
                    "enum": [
                      "default"
                    ],
                    "type": "string"
                  },
                  "language": {
                    "type": "string"
                  },
                  "lang_code": {
                    "type": "string"
                  },
                  "requestKey": {
                    "type": "string",
                    "pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]{7,127}$",
                    "maxLength": 128,
                    "minLength": 8,
                    "description": "Optional idempotency key: the same payer + requestKey + input within 7 days returns the stored result without a second charge."
                  },
                  "response_format": {
                    "enum": [
                      "json",
                      "wav"
                    ],
                    "type": "string",
                    "description": "json (default): base64 WAV inside JSON; wav: raw audio/wav body"
                  }
                },
                "additionalProperties": false
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json"
                ],
                "type": "string"
              },
              "discoverable": {
                "type": "boolean"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "required": [
                  "operation_id",
                  "status",
                  "result"
                ],
                "properties": {
                  "result": {
                    "type": "object"
                  },
                  "status": {
                    "type": "string"
                  },
                  "payment": {
                    "type": "object"
                  },
                  "operation_id": {
                    "type": "string"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.001USDC≈ $0.001 USD

on Base · exact scheme

Pay 0.001 USDC on Base to 0xe30c…d40DB. The signed payment is good for 5 minutes.

Paid to: 0xe30c…d40DB
USD Coin contract: 0x8335…02913
Payment window: 5 minutes
As published: 1000 smallest units

1000units

on Polygon · exact scheme