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Fauna vs Xata

Xata scores higher on the AgentReady, 70/100 against 20/100. They differ on 18 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Fauna. Fauna is a distributed serverless database that combines document flexibility with relational power, automatic scaling, and zero operational overhead.

Xata. A Postgres platform with instant branching and scale-to-zero compute.

Where Xata is ahead

Xata passes clear canonical domain, clear product positioning, public docs discoverable, llms.txt published, llms-full.txt / full agent docs, mcp discoverable and machine-readable metadata, and Fauna 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. Fauna misses it.

And on adopt, self-service signup, no mandatory sales call, agent-compatible signup flow, fast time to first request, copyable quickstart, cli available and mcp integration available. Fauna misses those.

Finally, on operate, canonical workflow succeeds, observable execution and agent compatibility verified. Fauna misses those.

What neither does

Both fail openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, programmatic credential creation, structured, predictable output, 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 is whether an agent can find the product at all without being told it exists. Xata leads 100 to 33. Fauna misses clear canonical domain, clear product positioning, public docs discoverable, llms.txt published, llms-full.txt / full agent docs, mcp discoverable, machine-readable metadata; Xata misses nothing.

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

Adopt. Xata leads 90 to 25. Fauna misses self-service signup, no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart, cli available, mcp integration available; Xata misses programmatic credential creation.

Operate. Xata leads 53 to 0. Fauna misses canonical workflow succeeds, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution, agent compatibility verified; Xata misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable.

Pricing

Fauna starts at $150/mo with no free tier. Xata starts at $0.012/hr and has a free tier.

Signal by signal

Which to pick

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

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