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Exa vs SerpApi

Exa scores higher on the AgentReady, 92/100 against 44/100. 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

Exa. Exa is a custom search engine built for AIs, offering an API to search the largest index of public web and private information.

SerpApi. SerpApi is a service that provides APIs to scrape search engine results pages (SERPs) from multiple search engines and platforms, offering structured data for various use cases including SEO, AI/LLM insights, ecommerce, and more.

Where Exa is ahead

Exa passes public docs discoverable, llms-full.txt / full agent docs and machine-readable metadata, and SerpApi 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, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented and limits / constraints documented. SerpApi misses those.

And on adopt, self-service signup, programmatic credential creation, fast time to first request and copyable quickstart. SerpApi misses those.

Finally, on operate, structured, predictable output, machine-readable errors, rate-limit behavior predictable and agent compatibility verified. SerpApi misses those.

What neither does

Both fail no mandatory sales call, agent-compatible signup flow, retry behavior documented, idempotency support. 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. Exa leads 100 to 73. Exa misses nothing; SerpApi misses public docs discoverable, llms-full.txt / full agent docs, machine-readable metadata.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Exa leads 100 to 23. Exa misses nothing; SerpApi misses structured api reference, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Exa leads 81 to 45. Exa misses no mandatory sales call, agent-compatible signup flow; SerpApi misses self-service signup, no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart.

Operate. Exa leads 88 to 35. Exa misses retry behavior documented, idempotency support; SerpApi misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Exa starts at $0 (free tier with credits) and has a free tier. SerpApi does not publish one with no free tier.

Signal by signal

Which to pick

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

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