{"id":"e2ba0be1-10db-43fa-8bed-2442a1eac585","shortId":"cg2Kc3","kind":"mpp","title":"OpenAI text-to-speech via MPP micropayment proxy on Tempo L2","tagline":"OpenAI text-to-speech via MPP micropayment proxy on Tempo L2","description":"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.\n\nHowever, 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.\n\nBecause 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.","tags":["llm","gpt-4o","dall-e","whisper","tts","embeddings","chat"],"capabilities":["text-to-speech","openai-tts-proxy","mpp-micropayment","tempo-l2-settlement","audio-synthesis"],"categories":["audio","llm"],"synonyms":["TTS","text to speech","speech synthesis","OpenAI TTS","voice generation","audio generation","speech API"],"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"],"endpointUrl":"https://openai.mpp.tempo.xyz/v1/audio/speech","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"mpp.tempo.xyz","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge","session"]}}}},"qualityScore":"0.150","qualityRationale":"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 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