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Lago vs Mercury

Mercury scores higher on the AgentReady, 81/100 against 39/100. They differ on 13 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Lago. Lago is a billing platform that provides API access for pushing customer information and metrics (events) from applications to a billing system.

Mercury. Mercury is a fintech company providing radically different banking for entrepreneurs, offering business banking, cards, expense management, payments, invoicing, and accounting in one platform.

Where Lago is ahead

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

It also holds adopt: no mandatory sales call, official typescript sdk and official python sdk. Mercury misses those.

And on operate, canonical workflow succeeds. Mercury misses it.

Where Mercury is ahead

Mercury passes clear canonical domain, clear product positioning, llms.txt published and machine-readable metadata, and Lago does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: pricing understandable. Lago misses it.

And on adopt, self-service signup, free trial or free allowance and cli available. Lago misses those.

What neither does

Both fail public docs discoverable, llms-full.txt / full agent docs, structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, programmatic credential creation, fast time to first request, copyable quickstart, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution. 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. Mercury leads 67 to 47. Lago misses clear canonical domain, clear product positioning, public docs discoverable, llms.txt published, llms-full.txt / full agent docs, machine-readable metadata; Mercury misses search discoverable, public docs discoverable, llms-full.txt / full agent docs.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Mercury leads 92 to 23. Lago misses structured api reference, openapi / spec quality, pricing understandable, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Mercury misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Mercury leads 88 to 45. Lago misses self-service signup, agent-compatible signup flow, programmatic credential creation, free trial or free allowance, fast time to first request, copyable quickstart, cli available; Mercury misses no mandatory sales call, programmatic credential creation, fast time to first request, copyable quickstart, official typescript sdk, official python sdk.

Operate. Mercury leads 78 to 41. Lago misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution; Mercury misses canonical workflow succeeds, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution.

Pricing

Lago does not publish a machine-readable starting price. Mercury does not publish one and has a free tier.

Signal by signal

Which to pick

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

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