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Propelauth vs Stoplight

Propelauth scores higher on the AgentReady, 59/100 against 48/100. They differ on 9 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Propelauth. PropelAuth provides end-to-end managed user authentication specializing in B2B use cases, built for AI-native companies with multi-tenant auth requirements

Stoplight. Stoplight is a collaborative platform equipping teams with tooling across the API lifecycle to help them build quality APIs efficiently.

Where Propelauth is ahead

Propelauth passes clear product positioning and mcp discoverable, and Stoplight does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: authentication documented and limits / constraints documented. Stoplight misses those.

And on adopt, fast time to first request, copyable quickstart and mcp integration available. Stoplight misses those.

Where Stoplight is ahead

Stoplight passes structured api reference, and Propelauth does not. That is understand, whether an agent can read the docs and work out how the API behaves before calling it.

It also holds operate: structured, predictable output. Propelauth misses it.

What neither does

Both fail clear canonical domain, llms.txt published, llms-full.txt / full agent docs, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, no mandatory sales call, programmatic credential creation, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified. If your agent needs any of those, you will be building it yourself either way.

Score, pillar by pillar

The AgentReady splits into four pillars, scored separately, because a product can be easy to find and still impossible to adopt.

Discover is whether an agent can find the product at all without being told it exists. Propelauth leads 80 to 53. Propelauth misses clear canonical domain, llms.txt published, llms-full.txt / full agent docs; Stoplight misses clear canonical domain, clear product positioning, llms.txt published, llms-full.txt / full agent docs, mcp discoverable.

Understand. Both sit at 38/100 here. Propelauth misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented; Stoplight misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Propelauth leads 80 to 55. Propelauth misses no mandatory sales call, programmatic credential creation; Stoplight misses no mandatory sales call, programmatic credential creation, fast time to first request, copyable quickstart, mcp integration available.

Operate. Stoplight leads 47 to 39. Propelauth misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Stoplight misses machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Propelauth starts at $0/month and has a free tier. Stoplight starts at $44/mo and has a free tier.

Signal by signal

Which to pick

Propelauth clears more of the signals an agent needs, so it is the safer default for unattended use. Full profiles: Propelauth and Stoplight. Alternatives to each: Propelauth, Stoplight.

An agent can fetch this as data: POST /v1/compare {"slugs": ["propelauth", "stoplight"]}