OpenAI text-to-speech via MPP micropayment proxy on Tempo L2
What it does
This endpoint proxies OpenAI's text-to-speech (TTS) API through a Tempo MPP (Micropayment Protocol) gateway at openai.mpp.tempo.xyz. The intended use is to allow callers to pay per-request using pathUSD on the Tempo L2 network, without needing an OpenAI API key directly. The endpoint path follows OpenAI's standard /v1/audio/speech route, which accepts a text input, a model selection (e.g., tts-1 or tts-1-hd), and a voice parameter, returning synthesized audio.
However, during probing the endpoint returned HTTP 404 on both HEAD and GET requests, and no 402 MPP payment challenge was captured. All crawled pages on the origin domain also returned "Not Found." This strongly suggests the endpoint is either not yet deployed, has been moved, or is temporarily offline. No pricing, schema, or documentation could be retrieved from the provider's domain.
Because this endpoint mirrors the OpenAI TTS API, callers would typically POST a JSON body with fields like "model", "input" (the text to speak), and "voice" (e.g., alloy, echo, fable, onyx, nova, shimmer). The response would be an audio file (mp3, opus, aac, or flac). Without a live 402 challenge, the exact per-call price and settlement details cannot be confirmed.
Capabilities
Use cases
- —Converting text content to spoken audio for accessibility
- —Generating voiceovers for videos or presentations
- —Building voice-enabled chatbots or assistants
- —Creating audio versions of articles or documents
Fit
Best for
- —Developers wanting pay-per-call OpenAI TTS without managing API keys
- —Agents needing programmatic speech synthesis with crypto micropayments
- —Applications requiring on-demand audio generation
Not for
- —Production workloads requiring a guaranteed-live endpoint (currently returning 404)
- —Real-time low-latency streaming speech synthesis
- —Users who need free or pre-paid TTS services
Quick start
curl -X POST https://openai.mpp.tempo.xyz/v1/audio/speech \
-H "Content-Type: application/json" \
-d '{"model":"tts-1","input":"Hello world","voice":"alloy"}'Example
Request
{
"input": "Hello, this is a test of text-to-speech.",
"model": "tts-1",
"voice": "alloy"
}Endpoint
Quality
The endpoint returned 404 on all probe methods and no MPP 402 challenge was captured. All crawled pages returned 'Not Found'. No pricing, schema, or documentation is available. The listing is essentially a stub based on the known OpenAI TTS API pattern and the Bazaar record.
Warnings
- —Endpoint returned 404 on HEAD and GET — no live MPP 402 challenge detected
- —All pages on the origin domain (root, /docs, /api, /pricing, /README) return 'Not Found'
- —Pricing and settlement details are unknown — no payment challenge was captured
- —Endpoint may be offline, not yet deployed, or moved to a different URL