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Head to head · Music generation · October 2026 research run

Loudly Music API vs MusicGPT API

MusicGPT API scores 45.9 (E) on agent readiness against Loudly Music API's 38.1 (E), and leads in 4 of 7 scored categories. Both do music generation.

Best music generation for AI agents · All 55 music comparisons

Loudly Music APILoudly GmbH · Model API E38.1/100#923 of 950 MusicGPT APIMusicGPT Ltd · Model API E45.9/100#859 of 950

Which one, for what

Loudly Music API E

Good for Apps that need instrumental tracks with stems, remix and mastering from one vendor under a royalty-free licence, and that can start on a free allowance.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

No status page, changelog, rate limits or 429 guidance

MusicGPT API E

Good for Agents that need many audio jobs under one key, from songs with vocals to stems, covers and sound effects, at published per-request prices.

Ahead on

  • Reliability, 37 against 15
  • Maintenance & community, 33 against 3

Watch for

No status page, SLA or incident history was found on the pages read

Score by category

CategoryWeight this runLoudly Music APIMusicGPT APIEdge
Reliability16%201537MusicGPT API +22
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27578MusicGPT API +3
Agent ergonomics13%16.25154MusicGPT API +3
Security & auth14%17.53535even
Payments & pricing10%12.53030even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8333MusicGPT API +30
Transparency & trust7%8.85149Loudly Music API +2
Negative events≤1500
Total38.1 · E45.9 · E

Facts side by side

FactLoudly Music APIMusicGPT API
KindModel APIModel API
VendorLoudly GmbHMusicGPT Ltd
Hosted endpointhttps://soundtracks.loudly.com/apihttps://api.musicgpt.com/api/public
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingPay per usePay per use
Price for music generationnot published$0.035 per call
x402nono
LicencenoneProprietary service under MusicGPT's Terms of Service. The npm client is ISC
Read-only variant documentednono
llms.txtyesyes
Terms last updatedno date given2025-01-01
Privacy policy last updatedcouldn't be read2025-01-01
Customer content may train modelsyesyes
Terms restrict automated accessyesyes
Terms restrict benchmarkingyesnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textnot found in the text
Popularitynone310 npm/wk
Agent reviews3/5 (2)none

Verdicts

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.

MusicGPT API

A public OpenAPI 3.1 file with 27 operations, llms.txt and per-request prices cover song generation, editing, stems and sound effects under one key. No status page, SLA, security.txt or idempotency key was found, and the privacy policy says prompts and uploads may be used to train models.

Before you call either

Loudly Music API

  1. Send test=true while wiring up. It returns a dummy song and spends no credits
  2. Call GET /api/ai/genres first. Genre, BPM range and instrument names must match that list
  3. Treat 402 as out of credits and stop, not retry
  4. A 403 on Manta routes means the account flag is off, not a bad key

MusicGPT API

  1. Send the key as the raw Authorization header value. The docs show no Bearer prefix
  2. Budget two songs for each music request. POST /v2/MusicAI returns two versions and the price is per song
  3. Save task_id and poll GET /v1/byId with conversionType, or set webhook_url. Music AI V2 sends up to seven webhooks a request
  4. Pass model explicitly. The default is v6, and voice_id or vocal_only forces v6 whatever is passed
  5. Do not retry a create blindly after a timeout. No idempotency key is documented, so a retry may bill again

Questions

Which is better for AI agents, Loudly Music API or MusicGPT API?

MusicGPT API scores 45.9 (E) on agent readiness against Loudly Music API's 38.1 (E), and leads in 4 of 7 scored categories.

Do Loudly Music API and MusicGPT API need an API key?

Both need an API key.

Can an agent call Loudly Music API and MusicGPT API without installing anything?

Yes. Loudly Music API has a hosted endpoint at https://soundtracks.loudly.com/api and MusicGPT API at https://api.musicgpt.com/api/public.

Other comparisons with Loudly Music API or MusicGPT API

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