FOSS4G 2023 Prizren Oskari (https://www.oskari.org, https://github.com/oskariorg) provides a super-easy-to-use tool for creating mobile friendly maps that can be embedded onto websites or used as is. When embedding the maps on existing websites one can utilise the RPC API to further leverage the capabilities of Oskari. The API allows for integrating with existing services and external data sources so that the end result will be a seamless spatially enabled service running on any modern web browser. While creating maps with Oskari requires no expertise in programming, utilising the RPC API requires basic knowledge of JavaScript. This talk will present the possibilities of Oskari RPC API among with some examples of live services created using it.