# Cloudflare TTS: Speak

Synthesize natural speech from text using OpenAI TTS (gpt-4o-mini-tts by default) through Cloudflare AI Gateway. Pass text plus an optional voice and model. Returns MP3 audio. Priced per 1k input characters.

- Method: POST
- Path: `/tts/speak`
- Price: $0.03000000

## Input Schema

```json
{
  "type": "object",
  "properties": {
    "text": {
      "type": "string",
      "minLength": 1,
      "maxLength": 2000,
      "description": "Text to synthesize. 1-2000 characters. Priced per 1k chars."
    },
    "voice": {
      "type": "string",
      "enum": [
        "alloy",
        "ash",
        "coral",
        "echo",
        "fable",
        "onyx",
        "nova",
        "sage",
        "shimmer"
      ],
      "description": "Voice: alloy (default), ash, coral, echo, fable, onyx, nova, sage, shimmer."
    },
    "model": {
      "type": "string",
      "enum": [
        "gpt-4o-mini-tts",
        "tts-1",
        "tts-1-hd"
      ],
      "description": "Model: gpt-4o-mini-tts (default), tts-1, or tts-1-hd."
    }
  },
  "required": [
    "text"
  ],
  "additionalProperties": false
}
```

## Output Schema

```json
{
  "type": "string",
  "format": "binary"
}
```

## Networks

| Name | Mode | CAIP-2 | Chain ID / Cluster | Protocols |
|---|---|---|---|---|
| Tempo Mainnet | live | `eip155:4217` | 4217 | mpp |
| Solana Mainnet | live | `solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp` | mainnet-beta | mpp, x402 |
| Base | live | `eip155:8453` | 8453 | x402 |

## Accepted Currencies

| Symbol | Name | Decimals | Network | Address | Protocols |
|---|---|---|---|---|---|
| USDC.e | Bridged USDC (Stargate) | 6 | `eip155:4217` | `0x20c000000000000000000000b9537d11c60e8b50` | mpp |
| USDC | USD Coin (Solana) | 6 | `solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp` | `EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v` | mpp, x402 |
| USDC | USD Coin | 6 | `eip155:8453` | `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` | x402 |

## How to invoke

Payment is handled automatically — the client signs the 402 challenge and retries.

### TypeScript — Tempo (mppx + fetch) ([docs](https://mpp.dev/sdk/typescript/client))

```ts
import { privateKeyToAccount } from 'viem/accounts'
import { Mppx, tempo } from 'mppx/client'

Mppx.create({
  methods: [tempo({ account: privateKeyToAccount('0x...') })],
})

const res = await fetch('https://cloudflare.payweave.services/tts/speak', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    "text": "",
    "voice": "alloy",
    "model": "gpt-4o-mini-tts"
  }),
})
const data = await res.json()
```

### TypeScript — Solana (@solana/mpp + fetch) ([docs](https://github.com/solana-foundation/mpp-sdk))

```ts
import { createKeyPairSignerFromBytes } from '@solana/kit'
import { Mppx } from 'mppx/client'
import { solana } from '@solana/mpp/client'

const signer = await createKeyPairSignerFromBytes(/* 64-byte secret key */)
Mppx.create({ methods: [solana({ signer })] })

const res = await fetch('https://cloudflare.payweave.services/tts/speak', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    "text": "",
    "voice": "alloy",
    "model": "gpt-4o-mini-tts"
  }),
})
const data = await res.json()
```

### mppx CLI ([docs](https://mpp.dev/sdk/typescript/cli))

```sh
npx mppx "https://cloudflare.payweave.services/tts/speak" -X POST -H 'Content-Type: application/json' -d '{"text":"","voice":"alloy","model":"gpt-4o-mini-tts"}'
```

### Tempo Wallet ([docs](https://docs.tempo.xyz/cli/wallet))

```sh
tempo request "https://cloudflare.payweave.services/tts/speak" -X POST --json '{"text":"","voice":"alloy","model":"gpt-4o-mini-tts"}'
```

### pay.sh — Solana Foundation ([docs](https://pay.sh))

```sh
pay --mainnet curl "https://cloudflare.payweave.services/tts/speak" -X POST -H 'Content-Type: application/json' -d '{"text":"","voice":"alloy","model":"gpt-4o-mini-tts"}'
```

### agentcash CLI ([docs](https://www.npmjs.com/package/agentcash))

```sh
npx agentcash fetch "https://cloudflare.payweave.services/tts/speak" -m POST -b '{"text":"","voice":"alloy","model":"gpt-4o-mini-tts"}' -p mpp
```

### x402 — Base / Solana USDC (x402-fetch) ([docs](https://x402.org))

```ts
import { wrapFetchWithPayment } from 'x402-fetch'
import { privateKeyToAccount } from 'viem/accounts'

const account = privateKeyToAccount('0x...') // Base USDC wallet
const fetchWithPay = wrapFetchWithPayment(fetch, account)

const res = await fetchWithPay('https://cloudflare.payweave.services/tts/speak', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    "text": "",
    "voice": "alloy",
    "model": "gpt-4o-mini-tts"
  }),
})
const data = await res.json()
```

### x402 — agentcash CLI

```sh
npx agentcash fetch "https://cloudflare.payweave.services/tts/speak" -m POST -b '{"text":"","voice":"alloy","model":"gpt-4o-mini-tts"}' -p x402
```