Response Codes

Code	Status	Description
200	OK	The request has succeeded.
307	Temporary Redirect	The requested resource is temporarily available at a different URL.
400	Bad Request	Arguments are not correctly transmitted.
401	Unauthorized	You forgot to add the token to the query.
402	Payment Required	Payment is required to access HikerAPI.
403	Forbidden	The account, comment, or media is private.
404	Not Found	The account, comment, or media was not found.
405	Method Not Allowed	This HTTP method is not allowed for HikerAPI.
408	Request Timeout	The server waited too long and closed the connection.
410	Gone	The endpoint is deprecated and retired (request fee is not charged). Use the alternative from the endpoint's docs.
422	Unprocessable Entity	The server understands the request but cannot process it due to semantic errors.
429	Too Many Requests	Your request was rejected due to exceeding the request limit. See Rate Limits.
430	Request Header Fields Too Large	Request header fields too large.
500	Internal Server Error	Internal server error (request fee is not charged).
503	Service Unavailable	Server temporarily unable to process requests (request fee is not charged).
504	Gateway Timeout	Network delays or server access problems (request fee is not charged).

Billing note

Only 200, 400, 403 and 404 responses are charged — the API does the work even when the result is "not found" or "private". Everything else is free: deprecated endpoints respond with 410 Gone and are never charged, and 50x server errors are not charged either.