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Clerk vs Stoplight

Clerk and Stoplight score alike on the AgentReady. They differ on 15 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Clerk. Clerk provides full-stack authentication and user management with products such as Organizations, Billing, and more.

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

Where Clerk is ahead

Clerk passes clear canonical domain, clear product positioning, llms.txt published, llms-full.txt / full agent docs 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. Stoplight misses it.

And on adopt, copyable quickstart and mcp integration available. Stoplight misses those.

Where Stoplight is ahead

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

It also holds understand: structured api reference and pricing understandable. Clerk misses those.

And on adopt, self-service signup, agent-compatible signup flow and free trial or free allowance. Clerk misses those.

Finally, on operate, structured, predictable output. Clerk misses it.

What neither does

Both fail openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, no mandatory sales call, programmatic credential creation, fast time to first request, 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. Clerk leads 87 to 53. Clerk misses search discoverable; Stoplight misses clear canonical domain, clear product positioning, llms.txt published, llms-full.txt / full agent docs, mcp discoverable.

Understand. Stoplight leads 38 to 23. Clerk misses structured api reference, openapi / spec quality, pricing understandable, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Stoplight misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Stoplight leads 55 to 48. Clerk misses self-service signup, no mandatory sales call, agent-compatible signup flow, programmatic credential creation, free trial or free allowance, fast time to first request; Stoplight misses no mandatory sales call, programmatic credential creation, fast time to first request, copyable quickstart, mcp integration available.

Operate. Stoplight leads 47 to 35. Clerk 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

Clerk does not publish a machine-readable starting price. Stoplight starts at $44/mo and has a free tier.

Signal by signal

Which to pick

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

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