2captcha vs Spider
Spider scores higher on the AgentReady, 72/100 against 58/100. They differ on 8 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.
What each one is
2captcha. Captcha solving service that provides API-based captcha solving for developers and captcha entry work for workers.
Spider. Spider is a web data platform that provides an API to render, search, and extract live web content into clean formats.
Where 2captcha is ahead
2captcha passes clear product positioning, and Spider does not. That is discover, whether an agent can find the product at all without being told it exists.
Where Spider is ahead
Spider passes structured api reference and limits / constraints documented, and 2captcha 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: agent-compatible signup flow and cli available. 2captcha misses those.
And on operate, retry behavior documented, idempotency support and agent compatibility verified. 2captcha misses those.
What neither does
Both fail public docs discoverable, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, no mandatory sales call, programmatic credential creation, machine-readable errors, 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. 2captcha leads 87 to 73. 2captcha misses public docs discoverable; Spider misses clear product positioning, public docs discoverable.
Understand. Spider leads 54 to 31. 2captcha misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Spider misses openapi / spec quality, request examples provided, response examples provided, errors and status codes documented.
Adopt. Spider leads 81 to 65. 2captcha misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation, cli available; Spider misses no mandatory sales call, programmatic credential creation.
Operate is whether an agent can run against it in production and recover when a call fails. Spider leads 78 to 47. 2captcha misses machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Spider misses machine-readable errors, rate-limit behavior predictable.
Pricing
2captcha starts at $0.5 per 1000 with no free tier. Spider starts at $1/GB and has a free tier.
| 2captcha plans | Spider plans |
|---|---|
| Image Captcha $0.5 — $1 per 1000 | Pay as you go $5 minimum top up |
| reCAPTCHA v2 $1 — $2.99 per 1000 | Unlimited $350/mo |
| reCAPTCHA v2 Callback $1 — $2.99 per 1000 | - |
| reCAPTCHA v2 Invisible $1 — $2.99 per 1000 | - |
| Cloudflare Turnstile $1.45 per 1000 | - |
| reCAPTCHA v3 (score <= 0.3) $1.45 per 1000 | - |
| reCAPTCHA v3 (score > 0.3) | - |
| reCAPTCHA Enterprise $1 — $2.99 per 1000 | - |
| Arkose Labs captcha (FunCaptcha) $1.45 — $50 per 1000 | - |
| Amazon captcha $1.45 per 1000 | - |
| ALTCHA $2.99 per 1000 | - |
Signal by signal
| Signal | 2captcha | Spider |
|---|---|---|
| AgentReady | 58 | 72 |
| Discovery | 87 | 73 |
| Understanding | 31 | 54 |
| Adoption | 65 | 81 |
| Operability | 47 | 78 |
| Public API | Yes | Yes |
| MCP server | Yes | Yes |
| OpenAPI spec | Unknown | Yes |
| CLI | Unknown | Yes |
| llms.txt | Yes | Yes |
| Self-serve signup | Yes | Yes |
| Free tier | No | Yes |
Which to pick
Spider clears more of the signals an agent needs, so it is the safer default for unattended use. Full profiles: 2captcha and Spider. Alternatives to each: 2captcha, Spider.
An agent can fetch this as data: POST /v1/compare {"slugs": ["2captcha", "spider"]}