What Is an API?

An API allows two independent software components to exchange information.

Authentication

eSputnik’s API uses HTTP Basic Access Authentication. You can generate an API key and use it for authentication.

With API keys, the external components can access your eSputnik account without transmitting the password.

❗️
The API key has access to your eSputnik account. Keep it secure and don’t expose it publicly in insecure communication channels.

To access your eSputnik account resources with the API key:

The format of the passed dates and times is in compliance with ISO 8601 standard.

Date–time with time zone is supported in three formats:

Notes:

T separates the date and time.
The numeric offset (±hh[:mm]) is the difference from UTC (e.g., +03:00 = UTC+3).
Use a minus sign for western time zones, e.g., 2025-11-07T11:05:30-02:00.
If you’re using UTC exactly, you may also use Z (e.g., 2025-11-07T11:05:30Z).

The currency values are passed as an amount and a currency code in ISO 4217 format.

Supported currencies: USD, EUR, UAH.

The default charset is UTF-8.
If you want to send or receive data in another charset use the following HTTP header:

Content-Type: application/json; charset=UTF-8

HTTP-response with status code 2хх - The operation was completed successfully. The response payload depends on the current operation.

HTTP-response with status code 4хх - The operation was completed with an error. Text details can be added to the response body.

All API requests to eSputnik are sent to https://esputnik.com/api/, where you should input one of our methods' addresses after the last slash. For example, https://esputnik.com/api/v1/account/info.