Alternatives to Курсы валют

Sends the current and official Bank of Russia rate for the dollar and euro, plus other CBR-quoted currencies, oil and gold, sourced from the Sberometer project. Free, Russian.

A longer-running currency conversion bot with "advanced features" per its own description, plus a linked news channel and support chat. Rates are explicitly for information only. Free, English.

Inline-only currency converter by an independent developer: type @crcvbot plus an amount and two currencies in any chat to get an instant conversion. Free, English, works only inline (no direct chat with the bot).

Inline currency converter: type @currconverter_bot 20 eur in usd in any chat to drop a converted amount straight into the conversation, using mid-market rates. Free, English, no group add needed.

Currency converter in a chat: send "100 usd to eur" or a pair and get the current rate, with inline mode for quick answers in any conversation. Free, English.