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Adyen vs Mercury

Mercury scores higher on the AgentReady, 81/100 against 55/100. They differ on 12 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Adyen. One platform for payments, data, and financial products.

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 Adyen is ahead

Adyen passes search discoverable, public docs discoverable and llms-full.txt / full agent docs, 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: official typescript sdk and official python sdk. Mercury misses those.

And on operate, canonical workflow succeeds, structured, predictable output and observable execution. Mercury misses those.

Where Mercury is ahead

Mercury passes authentication documented, and Adyen 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 adopt: self-service signup and cli available. Adyen misses those.

And on operate, agent compatibility verified. Adyen misses it.

What neither does

Both fail structured api reference, 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, copyable quickstart, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable. 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. Adyen leads 100 to 67. Adyen misses nothing; 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. Adyen misses structured api reference, openapi / spec quality, authentication documented, 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 50. Adyen misses self-service signup, no mandatory sales call, programmatic credential creation, 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 47. Adyen misses machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Mercury misses canonical workflow succeeds, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution.

Pricing

Adyen starts at $0.13 with no free tier. Mercury does not publish one and has a free tier.

Signal by signal

Which to pick

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

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