AltchaTokenProxyLess

Optional fields are not guaranteed across providers

Required fields are guaranteed across every provider that supports this task. Optional fields may be honored by some providers and silently ignored by others. AnySolver does not document per-provider parameter support, so before relying on an optional field, check that provider's own docs for the task you are using.

Supported Providers

Provider	Price per 1,000	Routing
TwoCaptcha	$2.99	Not picked
AntiCaptcha	$2.00	Auto FastestAuto Most Reliable
CapCracker	$2.50	Not picked
SolveCaptcha	$1.45	Auto Cheapest

Request Schema

Field	Type	Required	Description
`clientKey`*	string	Yes	Your API key from the AnySolver dashboard. Example: `your-api-key-from-dashboard`
`task`*	object	Yes	View task properties
`provider`		No	Specific provider to use. If omitted, automatic routing selects the best provider. Example: `CapSolver`
`selectionMode`		No	Read more at the routing strategies docs. Example: `autoCheapest`
`keyPoolMode`		No	Example: `all`

Task Object Properties

The task field accepts an object with the following properties:

Field	Type	Required	Description
`type`*		Yes
`websiteURL`*	URL	Yes	Full URL of the page where the CAPTCHA is displayed. Example: `https://altcha.org/playground`
`challengeURL`*	string	Yes	ALTCHA challenge URL, typically taken from the iframe src or widget configuration. This is mainly needed by providers that fetch the challenge file themselves. Example: `https://altcha.org/api/challenge?sitekey=demo`
`challengeJSON`*	string	Yes	Raw ALTCHA challenge JSON content fetched from the challenge URL. This should be the full serialized challenge payload returned by the target site. Example: `{"algorithm":"SHA-256","challenge":"4f2d...","salt":"8b9a...","signature":"MEUCIQ..."}`
`maxnumber`	number	No	Maximum puzzle number for the Altcha challenge. Defaults to 1000000 if omitted.

Example Request

{    "clientKey": "your-api-key-from-dashboard",    "task": {        "type": "AltchaTokenProxyLess",        "websiteURL": "https://altcha.org/playground",        "challengeURL": "https://altcha.org/api/challenge?sitekey=demo",        "challengeJSON": "{\"algorithm\":\"SHA-256\",\"challenge\":\"4f2d...\",\"salt\":\"8b9a...\",\"signature\":\"MEUCIQ...\"}"    }}

Response Schema

Field	Type	Required	Description
`status`*		Yes	Task status: "processing", "ready", or "failed". Example: `ready`
`errorId`*		Yes	0 = success, 1 = external error, 2 = internal error. Example: `0`
`taskId`	string	No	Unique identifier returned when the task was created. Example: `01KFNDF328KAN2AJ3BNHCQYE88`
`errorCode`		No	Machine-readable error code (e.g., "CAPTCHA_UNSOLVABLE"). Example: `CAPTCHA_UNSOLVABLE`
`errorDescription`	string	No	Human-readable error message with resolution hints. Example: `The captcha could not be solved.`
`cost`	number	No	Actual cost charged for this task in USD. Example: `0.002`
`taskType`		No	The type of CAPTCHA task to solve. Example: `ReCaptchaV2TokenProxyLess`
`provider`		No	Specific provider to use. If omitted, automatic routing selects the best provider. Example: `Multibot`
`solution`	object	No	View solution properties

Solution Object Properties

The solution field contains an object with the following properties:

Field	Type	Required	Description
`token`*	string	Yes	The solved CAPTCHA token to submit with your form. Example: `{"algorithm":"SHA-256","challenge":"4f2d...","number":81234,"salt":"8b9a...","signature":"MEUCIQ..."}`
`raw`*	Record<string, unknown>	Yes	Raw provider response data for advanced use cases.

Optional fields are not guaranteed across providers

Supported Providers

Provider	Price per 1,000	Routing
TwoCaptcha	$2.99	Not picked
AntiCaptcha	$2.00	Auto FastestAuto Most Reliable
CapCracker	$2.50	Not picked
SolveCaptcha	$1.45	Auto Cheapest

Request Schema

Field	Type	Required	Description
`clientKey`*	string	Yes	Your API key from the AnySolver dashboard. Example: `your-api-key-from-dashboard`
`task`*	object	Yes	View task properties
`provider`		No	Specific provider to use. If omitted, automatic routing selects the best provider. Example: `CapSolver`
`selectionMode`		No	Read more at the routing strategies docs. Example: `autoCheapest`
`keyPoolMode`		No	Example: `all`

Task Object Properties

The task field accepts an object with the following properties:

Field	Type	Required	Description
`type`*		Yes
`websiteURL`*	URL	Yes	Full URL of the page where the CAPTCHA is displayed. Example: `https://altcha.org/playground`
`challengeURL`*	string	Yes	ALTCHA challenge URL, typically taken from the iframe src or widget configuration. This is mainly needed by providers that fetch the challenge file themselves. Example: `https://altcha.org/api/challenge?sitekey=demo`
`challengeJSON`*	string	Yes	Raw ALTCHA challenge JSON content fetched from the challenge URL. This should be the full serialized challenge payload returned by the target site. Example: `{"algorithm":"SHA-256","challenge":"4f2d...","salt":"8b9a...","signature":"MEUCIQ..."}`
`maxnumber`	number	No	Maximum puzzle number for the Altcha challenge. Defaults to 1000000 if omitted.

Example Request

{    "clientKey": "your-api-key-from-dashboard",    "task": {        "type": "AltchaTokenProxyLess",        "websiteURL": "https://altcha.org/playground",        "challengeURL": "https://altcha.org/api/challenge?sitekey=demo",        "challengeJSON": "{\"algorithm\":\"SHA-256\",\"challenge\":\"4f2d...\",\"salt\":\"8b9a...\",\"signature\":\"MEUCIQ...\"}"    }}

Response Schema

Field	Type	Required	Description
`status`*		Yes	Task status: "processing", "ready", or "failed". Example: `ready`
`errorId`*		Yes	0 = success, 1 = external error, 2 = internal error. Example: `0`
`taskId`	string	No	Unique identifier returned when the task was created. Example: `01KFNDF328KAN2AJ3BNHCQYE88`
`errorCode`		No	Machine-readable error code (e.g., "CAPTCHA_UNSOLVABLE"). Example: `CAPTCHA_UNSOLVABLE`
`errorDescription`	string	No	Human-readable error message with resolution hints. Example: `The captcha could not be solved.`
`cost`	number	No	Actual cost charged for this task in USD. Example: `0.002`
`taskType`		No	The type of CAPTCHA task to solve. Example: `ReCaptchaV2TokenProxyLess`
`provider`		No	Specific provider to use. If omitted, automatic routing selects the best provider. Example: `Multibot`
`solution`	object	No	View solution properties

Solution Object Properties

The solution field contains an object with the following properties:

Field	Type	Required	Description
`token`*	string	Yes	The solved CAPTCHA token to submit with your form. Example: `{"algorithm":"SHA-256","challenge":"4f2d...","number":81234,"salt":"8b9a...","signature":"MEUCIQ..."}`
`raw`*	Record<string, unknown>	Yes	Raw provider response data for advanced use cases.

AltchaTokenProxyLess

Supported Providers

Request Schema

Task Object Properties

Example Request

Response Schema

Solution Object Properties

On this page

AltchaTokenProxyLess

Supported Providers

Request Schema

Task Object Properties

Example Request

Response Schema

Solution Object Properties

On this page