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Fly.io vs Unkey

Unkey scores higher on the AgentReady, 56/100 against 53/100. They differ on 10 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Fly.io. Fly.io provides real hardware-isolated Linux computers (called Sprites and Machines) for agents, evals, and tools, with a pay-as-you-go model where billing goes to zero when not in use.

Unkey. Unkey is a developer platform for modern APIs that unifies infrastructure, allowing developers to deploy APIs instantly, route traffic through global gateways, and understand usage in one place.

Where Fly.io is ahead

Fly.io passes mcp discoverable, and Unkey does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds adopt: mcp integration available. Unkey misses it.

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

Where Unkey is ahead

Unkey passes clear product positioning, and Fly.io 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, authentication documented and limits / constraints documented. Fly.io misses those.

And on adopt, free trial or free allowance, fast time to first request and copyable quickstart. Fly.io misses those.

What neither does

Both fail llms-full.txt / full agent docs, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, no mandatory sales call, agent-compatible signup flow, 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. Both sit at 80/100 here. Fly.io misses clear product positioning, llms-full.txt / full agent docs; Unkey misses llms-full.txt / full agent docs, mcp discoverable.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Unkey leads 54 to 23. Fly.io misses structured api reference, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Unkey misses openapi / spec quality, request examples provided, response examples provided, errors and status codes documented.

Adopt. Both sit at 55/100 here. Fly.io misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation, free trial or free allowance, fast time to first request, copyable quickstart; Unkey misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation, mcp integration available.

Operate. Fly.io leads 53 to 35. Fly.io misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable; Unkey misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Fly.io starts at $29/mo. Unkey starts at $5/mo and has a free tier.

Signal by signal

Which to pick

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

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