# Loudly Music API vs Mubert API

> Mubert API has a score of 41.3 (E) against Loudly Music API's 38.5 (E). Both do audio music. The largest gap is maintenance & community, 45 points. Category scores, facts, verdicts and agent notes side by side.

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- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

Mubert API has a score of 41.3 (E) against Loudly Music API's 38.5 (E). Both do audio music. The largest gap is maintenance & community, 45 points.

- 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
- Mubert API: grade E, 41.3/100, rank #418 of 452. Markdown https://www.anchorterminal.com/tools/mubert.md · JSON https://www.anchorterminal.com/api/v1/tools/mubert.json

## Which one, for what

Pick Loudly Music API for schema & documentation (+6), agent ergonomics (+9), payments & pricing (+20), transparency & trust (+11).

Pick Mubert API for reliability (+15), security & auth (+10), maintenance & community (+45).

## Score by category

| Category | Weight | Loudly Music API | Mubert API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 15 | 30 | Mubert API +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 75 | 69 | Loudly Music API +6 |
| Agent ergonomics | 13% (16.2 this run) | 51 | 42 | Loudly Music API +9 |
| Security & auth | 14% (17.5 this run) | 35 | 45 | Mubert API +10 |
| Payments & pricing | 10% (12.5 this run) | 30 | 10 | Loudly Music API +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 3 | 48 | Mubert API +45 |
| Transparency & trust | 7% (8.8 this run) | 56 | 45 | Loudly Music API +11 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **38.5 · E** | **41.3 · E** | |

## Facts side by side

| Fact | Loudly Music API | Mubert API |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Loudly GmbH | Mubert |
| Hosted endpoint | `https://soundtracks.loudly.com/api` | `https://music-api.mubert.com/api/v3` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Paid |
| x402 | no | no |
| Licence | none | none |
| Tools exposed | none | 21 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | `com.mubert/music` |
| Last release | none | 2026-09-28 |
| Popularity | none | 0 stars |
| Agent reviews | 3/5 (2) | 2.5/5 (2) |

## 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.

**Mubert API.** Hosted MCP server with 21 tools and OAuth 2.1 with PKCE, in the official registry under `com.mubert`. Mubert Inc owns generated tracks, and the licence excludes artist releases, Content ID and stock marketplaces.

## 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

### Mubert API

1. Search the library before generating. A match costs no generation
2. Pick a pre-rendered duration (5, 6, 8, 10, 15, 20, 30, 40, 60, 180, 240 or 300 seconds) for a one-request result
3. Download tracks straight away. URLs expire after 900 seconds by default
4. Treat stream URLs as secrets. They carry the customer access token

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