From 2Captcha

Drop-in replacement for https://api.2captcha.com and https://2captcha.com. We speak both transports — the modern JSON v2 protocol and the legacy in.php / res.php plain-text wire — under the same /2captcha/… prefix. Pick the one your SDK already targets.

Modern JSON v2

Used by newer 2Captcha SDKs and code shared from CapSolver examples.

Switch in two lines

Change the base URL

https://api.2captcha.com → https://captcha.solvium.io/2captcha

Use your Solvium key as `clientKey`

Issue one via @solvium_crypto_bot. Pass it where the SDK expects clientKey — same field, same place.

Request and response shapes match 2Captcha's JSON v2 docs field-for-field — createTask, getTaskResult, getBalance are all mounted under /2captcha/….

Legacy `in.php` / `res.php`

Used by virtually every existing 2Captcha SDK in the wild — Python's 2captcha-python, the PHP / Node / .NET clients, and most of the copy-paste solutions you'll find online.

Switch the host

https://2captcha.com → https://captcha.solvium.io/2captcha

The full paths are https://captcha.solvium.io/2captcha/in.php and …/res.php. Same plain-text responses by default (OK|<id>, CAPCHA_NOT_READY, ERROR_*), JSON when you pass json=1. GET, POST form-data, and POST JSON bodies are all accepted.

Auth: pass your Solvium API key as the key query/form parameter.

Example

The official 2captcha-python package — flip the host and you're done:

Python

from twocaptcha import TwoCaptcha
 
solver = TwoCaptcha("YOUR_API_KEY", server="captcha.solvium.io/2captcha")
 
result = solver.turnstile(
    sitekey="0x4AAAAAAA-3X4Nd7hf3mNGx",
    url="https://example.com",
)
print(result["code"])

Error codes

Errors translate to 2Captcha's ERROR_* strings on both the legacy and JSON v2 protocols:

What happened	Legacy / JSON v2
API key missing or unknown	`ERROR_KEY_DOES_NOT_EXIST`
Account balance below task price	`ERROR_ZERO_BALANCE`
`method` / `type` not supported	`ERROR_NO_SUCH_METHOD` / `ERROR_TASK_NOT_SUPPORTED`
Body missing required fields	`ERROR_BAD_PARAMETERS`
`id` unknown / belongs to another account	`ERROR_NO_SUCH_CAPCHA_ID`
Solve attempt failed terminally	`ERROR_CAPTCHA_UNSOLVABLE`
Result not ready yet (legacy only)	`CAPCHA_NOT_READY`