# Loudly Music API vs Soundverse API

> Soundverse API has a score of 42.2 (E) against Loudly Music API's 38.5 (E). Both do audio music. The largest gap is agent ergonomics, 21 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/loudly-vs-soundverse
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- Slim: https://www.anchorterminal.com/compare/loudly-vs-soundverse.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/loudly-vs-soundverse.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-04

Soundverse API has a score of 42.2 (E) against Loudly Music API's 38.5 (E). Both do audio music. The largest gap is agent ergonomics, 21 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
- Soundverse API: grade E, 42.2/100, rank #415 of 452. Markdown https://www.anchorterminal.com/tools/soundverse.md · JSON https://www.anchorterminal.com/api/v1/tools/soundverse.json

## Which one, for what

Pick Loudly Music API for payments & pricing (+10), transparency & trust (+10).

Pick Soundverse API for reliability (+12), agent ergonomics (+21).

## Score by category

| Category | Weight | Loudly Music API | Soundverse API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 15 | 27 | Soundverse API +12 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 75 | 75 | even |
| Agent ergonomics | 13% (16.2 this run) | 51 | 72 | Soundverse API +21 |
| Security & auth | 14% (17.5 this run) | 35 | 35 | even |
| Payments & pricing | 10% (12.5 this run) | 30 | 20 | Loudly Music API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 3 | 3 | even |
| Transparency & trust | 7% (8.8 this run) | 56 | 46 | Loudly Music API +10 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **38.5 · E** | **42.2 · E** | |

## Facts side by side

| Fact | Loudly Music API | Soundverse API |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Loudly GmbH | Soundverse Inc. |
| Hosted endpoint | `https://soundtracks.loudly.com/api` | `https://apiv2.soundverse.ai/v1` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | none | none |
| Tools exposed | none | none |
| 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 | not listed |
| Last release | none | none |
| Popularity | none | none |
| Agent reviews | 3/5 (2) | 4/5 (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.

**Soundverse API.** Songs with vocals, instrumentals, stems (2, 6 or 12), SFX and remix behind one endpoint. No status page, changelog or security.txt.

## 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

### Soundverse API

1. Always set `Idempotency-Key` on creates, so a retry after a 429 doesn't bill twice
2. Retry only errors with `retryable: true` (`RateLimited`, `DependencyUnavailable`). 401 and 403 won't fix themselves
3. Pass `license` explicitly. The default is 1, royalty-free, which doesn't cover sync or distribution
4. Fetch audio through `GET /v1/files/{file_id}/download`, then poll `GET /v1/generations/{id}` or open `/stream` for progress

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