Head to head · Audio music · October 2026 research run

Loudly Music API vs SOUNDRAW API

Loudly Music API has a score of 38.5 (E) against SOUNDRAW API's 12.5 (F). Both do audio music. The largest gap is schema & documentation, 70 points.

Which one, for what

No category where it leads by five points or more.

Category	Weight this run	Loudly Music API	SOUNDRAW API	Edge
Reliability	16%20	15	15	even
Performance	10%pending	pending	pending	not scored in this run
Schema & documentation	13%16.2	75	5	Loudly Music API +70
Agent ergonomics	13%16.2	51	0	Loudly Music API +51
Security & auth	14%17.5	35	20	Loudly Music API +15
Payments & pricing	10%12.5	30	10	Loudly Music API +20
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	42	Loudly Music API +14
Negative events	≤15	0	0
Total		38.5 · E	12.5 · F

Fact	Loudly Music API	SOUNDRAW API
Kind	Model API	Model API
Vendor	Loudly GmbH	SOUNDRAW Inc.
Hosted endpoint	`https://soundtracks.loudly.com/api`	no (local only)
Transports	HTTP	HTTP
Auth	API key	API key
Pricing	Pay per use	Paid
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)	1.5/5 (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.

Trained only on in-house compositions, per SOUNDRAW. No public API docs, OpenAPI spec, SDK or changelog.

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

Needs a contract and token before any call. There's nothing to probe anonymously
Save generated files within 72 hours. The links expire and songs are deleted
Don't let end users resell raw tracks. The licence restricts it