Head to head · Audio music · October 2026 research run

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.

Which one, for what

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

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)

Public OpenAPI 3.0 spec with error schemas for 400, 402, 403, 404 and 500. No status page, changelog, rate limits or 429 guidance.

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

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

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