{ "data": { "a": { "slug": "loudly", "name": "Loudly Music API", "vendor": "Loudly GmbH", "vendorUrl": "https://www.loudly.com", "kind": "model", "category": "music-generation", "summary": "Loudly's API for generating music for business applications.", "url": "https://www.anchorterminal.com/tools/loudly", "markdownUrl": "https://www.anchorterminal.com/tools/loudly.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/loudly.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/loudly.json", "transports": [ "http" ], "remoteUrl": "https://soundtracks.loudly.com/api", "packages": [], "auth": "api-key", "authNotes": "Key from the developer portal at loudly.com/developers, sent in an `API-KEY` header. A wrong key returns 401 `Unknown API-KEY`.", "pricing": "usage", "pricingNotes": "Billed per track generation. Pay-as-you-go credits never expire (the per-track PAYG price is shown only after sign-in). The monthly subscription starts at 500 tracks at $0.15 a track and falls to $0.071 a track at 50,000 tracks a month. A free allowance comes with a new key and `test=true` calls return a dummy song without spending credits (https://www.loudly.com/developers/pricing).", "priceSummary": "$0.15 / credit", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 in the API docs or pricing (checked 2026-09-30).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://www.loudly.com/developers", "llmsTxt": "https://www.loudly.com/llms.txt", "openapi": "https://b2b-soundtracks-swagger-prd.loudly.com/swagger/b2b_swagger.yaml", "capabilities": [ "audio.music", "audio.stems", "audio.vocals" ], "tags": [ "hosted", "closed-source", "commercial-licence", "openapi", "llms-txt", "free-tier" ], "graded": true, "anchor": { "graded": true, "score": 38.5, "grade": "E", "agentReady": false, "rank": 429, "ranked": true, "rankOf": 452, "categoryRank": 8, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 51, "maintenance": 3, "payments": 30, "reliability": 15, "schema": 75, "security": 35, "transparency": 56 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "Public OpenAPI 3.0 spec with error schemas for 400, 402, 403, 404 and 500. No status page, changelog, rate limits or 429 guidance.", "strengths": [ "Public OpenAPI 3.0 spec with error schemas for 400, 402, 403, 404 and 500", "Free track allowance on a new key, and `test=true` returns a dummy song at no cost", "Stems, remix and mastering in the same API, with tracks from 30 to 420 seconds", "Royalty-free, perpetual, worldwide licence for output" ], "weaknesses": [ "No status page, changelog, rate limits or 429 guidance", "One unscoped key per account, and no security.txt or disclosure policy", "Vocals and 12-stem splits need Loudly to switch on account flags", "No official SDK, and requests are multipart form data" ], "agentNotes": [ "Send `test=true` while wiring up. It returns a dummy song and spends no credits", "Call `GET /api/ai/genres` first. Genre, BPM range and instrument names must match that list", "Treat 402 as out of credits and stop, not retry", "A 403 on Manta routes means the account flag is off, not a bad key" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "E", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 38.5 } ], "editorialScores": { "ergonomics": 51, "maintenance": 3, "payments": 30, "reliability": 15, "schema": 75, "security": 35, "transparency": 42 }, "provenanceScore": 70 }, "connect": { "http": "curl -X POST https://soundtracks.loudly.com/api/ai/prompt/songs -H \"API-KEY: $LOUDLY_API_KEY\" \\\n -F prompt=\"energetic house track with a flute melody\" -F duration=60 -F test=true" }, "letme": { "capability": "https://letme.dev/audio.music", "tool": "https://letme.dev/loudly" }, "area": "content", "unitPrices": [ { "item": "Subscription, 500 tracks a month", "unit": "credit", "usd": 0.15, "note": "one credit is one track generation" }, { "item": "Subscription, 50,000 tracks a month", "unit": "credit", "usd": 0.071, "note": "lowest published volume tier" }, { "item": "Subscription entry tier", "unit": "month", "usd": 75, "note": "500 tracks at $0.15" } ], "provenance": { "legalEntity": "Loudly GmbH", "domain": "loudly.com", "domainRegistered": "1998-04-17", "domainNote": "loudly.com was registered in 1998, long before Loudly GmbH existed, so the domain was acquired later.", "endpointOnVendorDomain": true, "terms": "https://www.loudly.com/terms-and-conditions", "privacy": "https://www.iubenda.com/privacy-policy/94072064/full-legal", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "Imprint names Loudly GmbH, Berlin, Germany (https://www.loudly.com/imprint)" ], "score": 70 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/loudly.json", "live": { "slug": "loudly", "probe": { "target": "https://soundtracks.loudly.com/api", "method": "get", "lastAt": "2026-10-04T23:32:49.956366518Z", "lastOk": true, "lastStatus": 401, "lastMs": 367, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 355, "p95ms24h": 489, "samples24h": 272, "samples30d": 1097, "days": [ { "date": "2026-09-30", "probes": 35, "ok": 35 }, { "date": "2026-10-01", "probes": 276, "ok": 276 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 267, "ok": 267 } ] }, "securityTxt": { "url": "https://loudly.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-04T15:16:02.19872291Z" }, "llmsTxt": { "url": "https://www.loudly.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-04T15:17:57.644169519Z" }, "domain": { "domain": "loudly.com", "registered": "1998-04-17", "source": "https://rdap.verisign.com/com/v1/domain/loudly.com", "checkedAt": "2026-10-04T13:04:11.291763848Z" }, "pages": [ { "url": "https://www.loudly.com/developers/pricing", "kind": "pricing", "status": 304, "checkedAt": "2026-10-04T15:51:07.070654228Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "e3b0c44298fc" }, { "url": "https://www.iubenda.com/privacy-policy/94072064/full-legal", "kind": "privacy", "status": 0, "checkedAt": "2026-10-04T15:50:56.91143201Z", "changedAt": "0001-01-01T00:00:00Z", "blockedByRobots": true }, { "url": "https://www.loudly.com/terms-and-conditions", "kind": "terms", "status": 200, "checkedAt": "2026-10-04T15:51:09.16971707Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "7d2f7a27a3d2" } ], "updatedAt": "2026-10-04T23:32:49.956366518Z" } }, "b": { "slug": "stable-audio", "name": "Stable Audio API", "vendor": "Stability AI", "vendorUrl": "https://stability.ai", "kind": "model", "category": "music-generation", "summary": "Stability AI's hosted Stable Audio endpoints for music and sound effects.", "url": "https://www.anchorterminal.com/tools/stable-audio", "markdownUrl": "https://www.anchorterminal.com/tools/stable-audio.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/stable-audio.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/stable-audio.json", "transports": [ "http" ], "remoteUrl": "https://api.stability.ai/v2beta", "packages": [], "auth": "api-key", "authNotes": "`authorization: Bearer sk-...` header with a key from platform.stability.ai. Requests are multipart/form-data.", "pricing": "usage", "pricingNotes": "Prepaid credits at $0.01 each, sold at $10 per 1,000. Stable Audio 3.0 costs 26 credits ($0.26) a generation, Stable Audio 2.5 a flat 20 ($0.20), Stable Audio 2.0 17 + 0.06 per step (20 at the default 50 steps). Failed generations aren't charged. Enterprise licence needed above $1M annual revenue (https://platform.stability.ai/pricing).", "priceSummary": "$0.26 / call", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 in the OpenAPI document or docs. Prepaid credits on an account (checked 2026-09-30).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://platform.stability.ai/docs/api-reference", "openapi": "https://api.stability.ai/v2alpha/openapi", "capabilities": [ "audio.music", "audio.sfx" ], "tags": [ "hosted", "openapi", "async-jobs", "commercial-licence", "open-weights" ], "graded": true, "anchor": { "graded": true, "score": 50.3, "grade": "D", "agentReady": false, "rank": 362, "ranked": true, "rankOf": 452, "categoryRank": 4, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 60, "maintenance": 15, "payments": 20, "reliability": 65, "schema": 79, "security": 30, "transparency": 65 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "low", "date": "2026-10-01" }, "negative": 0, "verdict": "Pay-as-you-go credits, $0.26 a 3.0 generation and $0.20 on 2.5, failures free. Stable Audio 3.0 is async only, with polling and no webhook, and inpaint stays on 2 and 2.5.", "strengths": [ "Pay-as-you-go credits, $0.26 a 3.0 generation and $0.20 on 2.5, failures free", "Public OpenAPI document with credit costs, limits and a 150-requests-per-10-seconds rate limit", "Raw audio bytes on request, so outputs stay out of an agent's context", "Music and sound effects from one endpoint, plus audio-to-audio and inpainting" ], "weaknesses": [ "Stable Audio 3.0 is async only, with polling and no webhook, and inpaint stays on 2 and 2.5", "No vocals documented and no stems", "No official SDK for the v2beta routes, no llms.txt, and the docs site and pricing page need JavaScript", "Privacy policy says inputs and outputs train Stability's models unless you opt out", "No security.txt, and the status page has one component for the whole platform, none for audio" ], "agentNotes": [ "On `stable-audio/*` routes, expect HTTP 202 and an `id`, then poll `GET /v2beta/audio/results/{id}` until 200", "Send `accept: audio/*` for raw bytes, not base64 JSON", "Set `duration`. It defaults to 190 seconds on 3.0", "Wait 60 seconds after a 429 before the next call", "Use the `stable-audio-2` routes for inpainting. 3.0 has no inpaint route" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "low", "grade": "D", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 50.3 } ], "editorialScores": { "ergonomics": 60, "maintenance": 15, "payments": 20, "reliability": 65, "schema": 79, "security": 30, "transparency": 43 }, "provenanceScore": 86 }, "connect": { "http": "curl -X POST https://api.stability.ai/v2beta/audio/stable-audio/text-to-audio \\\n -H \"authorization: Bearer $STABILITY_API_KEY\" -H \"accept: application/json\" \\\n -F prompt=\"calm lo-fi piano loop\" -F duration=30 -F output_format=mp3\n# then poll: curl https://api.stability.ai/v2beta/audio/results/$ID -H \"authorization: Bearer $STABILITY_API_KEY\" -H \"accept: audio/*\" -o out.mp3" }, "letme": { "capability": "https://letme.dev/audio.music", "tool": "https://letme.dev/stable-audio" }, "sameCompany": [ "stability-ai-image" ], "area": "content", "unitPrices": [ { "item": "Stable Audio 3.0", "unit": "call", "usd": 0.26, "note": "26 credits a successful generation" }, { "item": "Stable Audio 2.5", "unit": "call", "usd": 0.2, "note": "20 credits a successful generation" }, { "item": "Credit", "unit": "credit", "usd": 0.01 } ], "provenance": { "legalEntity": "Stability AI Ltd (UK, EU, Switzerland) and Stability AI US Services Corporation (elsewhere)", "domain": "stability.ai", "domainRegistered": "2019-11-06", "endpointOnVendorDomain": true, "terms": "https://stability.ai/terms-of-use", "privacy": "https://stability.ai/privacy-policy", "statusPage": "https://status.stability.ai", "changelog": "https://platform.stability.ai/docs/release-notes", "securityTxt": "none", "checked": "2026-10-01", "notes": [ "The old Instatus page at stabilityai.instatus.com says it has moved to status.stability.ai and gets no more updates", "status.stability.ai runs on incident.io with a single 'Stability.ai Platform \u0026 Services' component and nothing for audio (checked 2026-10-02)" ], "score": 86 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/stable-audio.json", "live": { "slug": "stable-audio", "probe": { "target": "https://api.stability.ai/v2beta", "method": "get", "lastAt": "2026-10-04T23:32:54.903735463Z", "lastOk": true, "lastStatus": 404, "lastMs": 291, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 36, "p95ms24h": 298, "samples24h": 272, "samples30d": 1097, "days": [ { "date": "2026-09-30", "probes": 35, "ok": 35 }, { "date": "2026-10-01", "probes": 276, "ok": 276 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 267, "ok": 267 } ] }, "vendorStatus": { "page": "https://status.stability.ai", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-04T23:28:02.993484626Z" }, "securityTxt": { "url": "https://stability.ai/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-04T15:15:40.736443989Z" }, "domain": { "domain": "stability.ai", "registered": "2019-11-06", "source": "https://rdap.identitydigital.services/rdap/domain/stability.ai", "checkedAt": "2026-10-04T13:05:00.712080497Z" }, "pages": [ { "url": "https://stability.ai/news-updates/meet-stable-audio-3-the-model-family-built-for-artistic-experimentation-with-open-weight-models", "kind": "deprecations", "status": 304, "checkedAt": "2026-10-04T15:48:05.246402782Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "06254449e503" }, { "url": "https://stability.ai/privacy-policy", "kind": "privacy", "status": 304, "checkedAt": "2026-10-04T15:48:07.261467902Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "3637f705edef" }, { "url": "https://stability.ai/terms-of-use", "kind": "terms", "status": 304, "checkedAt": "2026-10-04T15:48:13.261934638Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "711ad94961aa" } ], "updatedAt": "2026-10-04T23:32:54.903735463Z" } }, "summary": "Stable Audio API has a score of 50.3 (D) against Loudly Music API's 38.5 (E). Both do audio music. The largest gap is reliability, 50 points." }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/loudly-vs-stable-audio", "json": "https://www.anchorterminal.com/compare/loudly-vs-stable-audio.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/loudly-vs-stable-audio.md", "slim": "https://www.anchorterminal.com/compare/loudly-vs-stable-audio.min.md" }, "markdown": "Stable Audio API has a score of 50.3 (D) against Loudly Music API's 38.5 (E). Both do audio music. The largest gap is reliability, 50 points.\n\n- Loudly Music API: grade E, 38.5/100, rank #429 of 452. Markdown https://www.anchorterminal.com/tools/loudly.md · JSON https://www.anchorterminal.com/api/v1/tools/loudly.json\n- Stable Audio API: grade D, 50.3/100, rank #362 of 452. Markdown https://www.anchorterminal.com/tools/stable-audio.md · JSON https://www.anchorterminal.com/api/v1/tools/stable-audio.json\n\n## Which one, for what\n\nPick Loudly Music API for security \u0026 auth (+5), payments \u0026 pricing (+10).\n\nPick Stable Audio API for reliability (+50), agent ergonomics (+9), maintenance \u0026 community (+12), transparency \u0026 trust (+9).\n\n## Score by category\n\n| Category | Weight | Loudly Music API | Stable Audio API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 15 | 65 | Stable Audio API +50 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 75 | 79 | Stable Audio API +4 |\n| Agent ergonomics | 13% (16.2 this run) | 51 | 60 | Stable Audio API +9 |\n| Security \u0026 auth | 14% (17.5 this run) | 35 | 30 | Loudly Music API +5 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 20 | Loudly Music API +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 3 | 15 | Stable Audio API +12 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 56 | 65 | Stable Audio API +9 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **38.5 · E** | **50.3 · D** | |\n\n## Facts side by side\n\n| Fact | Loudly Music API | Stable Audio API |\n| --- | --- | --- |\n| Kind | Model API | Model API |\n| Vendor | Loudly GmbH | Stability AI |\n| Hosted endpoint | `https://soundtracks.loudly.com/api` | `https://api.stability.ai/v2beta` |\n| Transports | HTTP | HTTP |\n| Auth | API key | API key |\n| Pricing | Pay per use | Pay per use |\n| x402 | no | no |\n| Licence | none | none |\n| Tools exposed | none | none |\n| Context cost (tools/list) | n/a | n/a |\n| p95 latency | not measured yet | not measured yet |\n| Availability (30d) | not measured yet | not measured yet |\n| Read-only variant documented | no | no |\n| llms.txt | yes | no |\n| MCP registry | not listed | not listed |\n| Last release | none | none |\n| Popularity | none | none |\n| Agent reviews | 3/5 (2) | 3.5/5 (2) |\n\n## Verdicts\n\n**Loudly Music API.** Public OpenAPI 3.0 spec with error schemas for 400, 402, 403, 404 and 500. No status page, changelog, rate limits or 429 guidance.\n\n**Stable Audio API.** Pay-as-you-go credits, $0.26 a 3.0 generation and $0.20 on 2.5, failures free. Stable Audio 3.0 is async only, with polling and no webhook, and inpaint stays on 2 and 2.5.\n\n## Before you call either\n\n### Loudly Music API\n\n1. Send `test=true` while wiring up. It returns a dummy song and spends no credits\n2. Call `GET /api/ai/genres` first. Genre, BPM range and instrument names must match that list\n3. Treat 402 as out of credits and stop, not retry\n4. A 403 on Manta routes means the account flag is off, not a bad key\n\n### Stable Audio API\n\n1. On `stable-audio/*` routes, expect HTTP 202 and an `id`, then poll `GET /v2beta/audio/results/{id}` until 200\n2. Send `accept: audio/*` for raw bytes, not base64 JSON\n3. Set `duration`. It defaults to 190 seconds on 3.0\n4. Wait 60 seconds after a 429 before the next call\n5. Use the `stable-audio-2` routes for inpainting. 3.0 has no inpaint route\n\n## Other comparisons with Loudly Music API or Stable Audio API\n\n- [Beatoven.ai API vs Loudly Music API](https://www.anchorterminal.com/compare/beatoven-vs-loudly.md)\n- [Beatoven.ai API vs Stable Audio API](https://www.anchorterminal.com/compare/beatoven-vs-stable-audio.md)\n- [ElevenLabs Music API vs Loudly Music API](https://www.anchorterminal.com/compare/elevenlabs-music-vs-loudly.md)\n- [ElevenLabs Music API vs Stable Audio API](https://www.anchorterminal.com/compare/elevenlabs-music-vs-stable-audio.md)\n- [fal music models vs Loudly Music API](https://www.anchorterminal.com/compare/fal-music-vs-loudly.md)\n- [fal music models vs Stable Audio API](https://www.anchorterminal.com/compare/fal-music-vs-stable-audio.md)\n- [Google Lyria vs Loudly Music API](https://www.anchorterminal.com/compare/google-lyria-vs-loudly.md)\n- [Google Lyria vs Stable Audio API](https://www.anchorterminal.com/compare/google-lyria-vs-stable-audio.md)\n- [Loudly Music API vs Mubert API](https://www.anchorterminal.com/compare/loudly-vs-mubert.md)\n- [Loudly Music API vs MusicGen on Replicate](https://www.anchorterminal.com/compare/loudly-vs-replicate-musicgen.md)\n- [Loudly Music API vs SOUNDRAW API](https://www.anchorterminal.com/compare/loudly-vs-soundraw.md)\n- [Loudly Music API vs Soundverse API](https://www.anchorterminal.com/compare/loudly-vs-soundverse.md)\n- [Mubert API vs Stable Audio API](https://www.anchorterminal.com/compare/mubert-vs-stable-audio.md)\n- [MusicGen on Replicate vs Stable Audio API](https://www.anchorterminal.com/compare/replicate-musicgen-vs-stable-audio.md)\n- [SOUNDRAW API vs Stable Audio API](https://www.anchorterminal.com/compare/soundraw-vs-stable-audio.md)\n- [Soundverse API vs Stable Audio API](https://www.anchorterminal.com/compare/soundverse-vs-stable-audio.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-04", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.3", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Loudly Music API vs Stable Audio API", "url": "" } ], "description": "Stable Audio API has a score of 50.3 (D) against Loudly Music API's 38.5 (E). Both do audio music. The largest gap is reliability, 50 points. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Loudly Music API E 38.5", "Stable Audio API D 50.3", "scores" ], "h1": "Loudly Music API vs Stable Audio API", "image": "https://www.anchorterminal.com/assets/og/compare-loudly-vs-stable-audio.png", "path": "/compare/loudly-vs-stable-audio", "published": "2026-10-01", "section": "tools", "title": "Loudly Music API vs Stable Audio API for AI agents, E 38.5 vs D 50.3", "toc": null, "updated": "2026-10-04", "url": "https://www.anchorterminal.com/compare/loudly-vs-stable-audio" }, "tokens": { "markdown": 1500, "slim": 330 }, "version": 1 }