Alternatives to Exchange Rates

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.

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.

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.

A no-frills currency bot: pick a currency in a menu or type an amount and it converts it using CBR-style reference rates, with a simple chart. Independent project, not an official Bank of Russia service. Free, Russian interface.

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).