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Agent402 CAPTCHA Server-Side Verification
x402
Agent402 CAPTCHA Server-Side Verification is a paid API for AI agents from agent402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Validates a Cloudflare Turnstile, Google reCAPTCHA, or hCaptcha client token server-side by relaying to the provider's siteverify endpoint and returning a normalized pass/fail verdict
Price / call$0.002
Success—
StatusUnknown
How this service works
Validate a Cloudflare Turnstile, Google reCAPTCHA, or hCaptcha token server-side. You pass your OWN provider secret plus the token from the client; we relay to the provider's siteverify endpoint (never logged) and return the normalized verdict (success, hostname, action, score, error codes). The legitimate backend half of bot protection - no solving, no bypass.
Output
A normalized verdict object indicating whether the captcha token is valid (success true/false), along with any provider-specific metadata returned from the siteverify endpoint such as score, action, hostname, or error codes.
Example use cases
Example prompt
“Verify this reCAPTCHA token server-side for me — the token from the client is '03AGdBq25...', my reCAPTCHA secret key is '6LeIxAcTAAAAAGG-vFI1TnRWxMZNFuojJ4WifJWe', provider is recaptcha, and the client IP is 203.0.113.42.”
Technical details
Endpoint
POSThttps://agent402.tools/api/captcha-verifyWhen to prefer
Use this endpoint when your agent needs to validate a CAPTCHA token server-side without managing direct HTTP calls to each provider's siteverify API. Ideal when you need provider-agnostic normalized results across Turnstile, reCAPTCHA, and hCaptcha, or when operating in an environment where making outbound HTTP calls to Google/Cloudflare/hCaptcha is inconvenient. The secret key is never logged or stored.
Side effects
- Invalid or expired token returns success:false with error codes from the provider
- Wrong secret key causes provider authentication failure
- Unknown provider value returns a 400-level validation error
- Network timeout reaching the upstream provider siteverify endpoint
- Token already consumed (replay) returns success:false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | the captcha response token from the client |
| secret | string | your provider secret key (relayed to the provider, never stored/logged) |
| provider | string | turnstile | recaptcha | hcaptcha |
| remoteip | string | optional client IP to pass through |
Output
Schema · Response
{
"type": "json",
"example": {
"success": true,
"hostname": "example.com",
"provider": "turnstile",
"errorCodes": []
}
}Tags
x402
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