Providing temporary use of on-line, non-downloadable software for processing electronic payments; providing temporary use of on-line, non-downloadable software for processing payment by cryptocurrency; providing on-line non downloadable software for user interface integration and developing customized cryptocurrency and blockchain trading orders, trading engines, and trading strategies; providing open-source toolkit software for user interface integration and developing customized cryptocurrency and blockchain trading orders, trading engines, and trading strategies; application service provider featuring application programming interface (API) software for user interface integration and developing customized cryptocurrency and blockchain trading orders, trading engines, and trading strategies; platform as a service (PAAS) featuring computer software platforms for user interface integration and developing customized cryptocurrency and blockchain trading orders, trading engines, and trading strategies; platform as a service (PAAS) featuring computer software platforms for allowing online peer-to-peer currency financial services, namely, for trading, lending, financing, and exchange of currency, digital currency, virtual currency, valuable tokens, and digital tokens; design and development of computer software; maintenance of computer software; updating of computer software; computer programming; assistance in implementing and installing software by all communications means; software integration