{"uid":"cap_K0SUN6u-WlNCpgt5pe-fR","slug":"zero-elevenlabs-music-fly-dev-elevenlabs-instrumental-background-1028c173","name":"ElevenLabs Instrumental Background Music Generator","description":"Compose an instrumental background music track with ElevenLabs Music and return audio bytes.","url":"https://zero-elevenlabs-music.fly.dev/v1/music?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","required":["prompt"],"properties":{"seed":{"type":"integer","maximum":2147483647,"minimum":0},"prompt":{"type":"string","maxLength":4100,"minLength":1,"description":"Text prompt for ElevenLabs Music. Do not include artist names, song titles, or copyrighted lyrics."},"output_format":{"type":"string","default":"mp3_44100_128","description":"ElevenLabs output format, for example mp3_44100_128."},"sign_with_c2pa":{"type":"boolean","default":false},"music_length_ms":{"type":"integer","default":30000,"maximum":90000,"minimum":3000,"description":"Generated track length in milliseconds."},"force_instrumental":{"type":"boolean","default":true,"description":"Force an instrumental track for background music use cases."}},"additionalProperties":false},"responseSchema":{"type":"string","format":"binary"},"example":null,"exampleRequest":null,"tags":[],"displayCostAmount":"0.5","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":13,"rating":{"score":"0.64","successRate":"0.78","reviews":13,"stars":"3.6","state":"rated"},"availabilityStatus":"healthy","priceObserved":{"p10Cents":"50.0000","medianCents":"50.0000","p90Cents":"50.0000","minCents":"50.0000","maxCents":"50.0000","p95Cents":"50.0000","sampleCount":11,"varies":false,"failureChargeRate":1},"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.5/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.5","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.5","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_TIHvqrPUdLterrO3W8ROB","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.5","costPer":"request","priority":0,"asset":"0x20C000000000000000000000b9537d11c60E8b50","unit":"request","depositMicros":null,"planRef":"elevenlabs-music-compose:v1:1"}],"brandName":"zero-elevenlabs-music.fly.dev","brandSlug":"zero-elevenlabs-music-fly-dev-mpp","brandBaseUrl":"https://zero-elevenlabs-music.fly.dev","brandDocsUrl":null,"whatItDoes":"Generates an instrumental background music track from a text prompt using ElevenLabs Music, returning raw audio bytes.","exampleAgentPrompt":"Compose a 30-second instrumental lo-fi hip-hop background track with a relaxed, chill vibe — no vocals — and give me the MP3 audio file.","exampleUseCases":null,"resultDescription":"Raw binary audio bytes (MP3 by default at 44100 Hz, 128 kbps) of the generated instrumental music track, ready for download or playback.","failureModes":["Prompt includes artist names, song titles, or copyrighted lyrics — rejected by ElevenLabs","music_length_ms out of range (below 3000 or above 90000 ms) — validation error","Prompt is empty or exceeds 4100 characters — request rejected","Upstream ElevenLabs API unavailable — 502 or 503 error","Payment not completed or insufficient USDC balance — payment required error"],"whenToPreferThis":"Use this endpoint when you need a pure instrumental background music track (no vocals) generated from a natural language description, especially for background audio in videos, podcasts, apps, or presentations. Prefer this over the vocal/song endpoint when you explicitly do not want lyrics or singing.","instructions":null,"reviewSummary":"Generates instrumental background music tracks from text prompts via ElevenLabs, returning base64-encoded MP3 audio (44.1kHz/128kbps) synchronously in a single call with no polling required. Prompt-following is strong for genre, tempo, mood, and instrument direction; exact length control via music_length_ms is honored reliably. Three of thirteen runs failed with upstream 502/429 errors, and the flat $0.50 charge applies even on failed requests.","reviewSummaryHighlights":["Strong prompt adherence for genre, tempo, mood, and instrumentation","Exact duration control via music_length_ms honored reliably (up to 90s tested)","Synchronous single-call delivery — no polling or webhooks needed"],"reviewSummaryConcerns":["Upstream failures (502, 429) still incur the $0.50 charge with no audio returned","'seed' parameter combined with 'prompt' causes 422 errors; artist names in prompts trigger 502 failures","Response is base64-encoded — audio must be decoded before use"],"reviewSummaryGeneratedAt":"2026-10-21T10:15:06.514Z","activationCount":114,"lastUsedAt":"2026-10-20T17:50:18.294Z","lastSuccessfullyRanAt":"2026-10-20T17:50:18.294Z","lastHealthCheckAt":"2026-10-22T12:56:00.160Z","isFirstParty":false,"canonicalSlug":"zero-elevenlabs-music-fly-dev-elevenlabs-instrumental-background-1028c173"}