{"id":"0ac1f24c-2557-407c-b699-b0c4a041be69","shortId":"hBfd6L","kind":"mpp","title":"Transform audio using Stability AI's generative models via pay-per-call MPP endpoint.","tagline":"Transform audio using Stability AI's generative models via pay-per-call MPP endpoint.","description":"This endpoint provides access to Stability AI's Audio to Audio capability through the Locus MPP (Micropayment Protocol) gateway. It accepts an input audio file and a text prompt describing the desired transformation, then returns a modified audio output generated by Stable Audio 2 or 2.5 models.\n\nThe service supports configurable transformation strength (0–1), inference steps, output format (mp3/wav), and reproducible results via seed parameter. Pricing is approximately $0.23 per call at 50 steps using stable-audio-2, settled in pathUSD on Tempo L2. The endpoint uses the MPP charge intent, meaning each call is a one-shot payment.\n\nThis is one endpoint within a broader Stability AI suite available through Locus MPP that includes image generation (Ultra, Core, SD3), image editing (erase, inpaint, outpaint, search-and-replace), upscaling, 3D model generation, and other audio operations. The endpoint requires a POST request with JSON body containing at minimum the audio file and prompt fields.","tags":["image-generation","stable-diffusion","upscaling","3d"],"capabilities":["audio-to-audio","audio-transformation","generative-audio","stable-audio-2","stable-audio-2.5","prompt-guided-audio","pay-per-call","mpp-tempo-settlement"],"categories":["audio","ai"],"synonyms":["audio style transfer","audio transformation","sound modification","audio remix","stable audio","audio generation from audio","sound design AI","audio-to-audio generation"],"warnings":["Endpoint returned 404 on HEAD/GET probes — likely POST-only; liveness not fully confirmed via MPP challenge","No response schema documented — output format/structure is unknown","Price amount field is null; $0.23 figure comes from OpenAPI description text only","Root domain returns 404 with redirect to skill.md/llms.txt docs"],"endpointUrl":"https://stability-ai.mpp.paywithlocus.com/stability-ai/audio-to-audio","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"stability-ai.mpp.paywithlocus.com","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.550","qualityRationale":"The OpenAPI schema is well-defined with clear request parameters and pricing info. However, the specific endpoint did not return a 402 challenge on HEAD/GET (returned 404 instead, likely because it only accepts POST), no response schema is documented, and crawled pages returned no useful documentation. Pricing is stated in the OpenAPI description field but the amount field is null, requiring reliance on the text 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