LeakCheck

LeakCheck1_Bot is run by LeakCheck, a company that has offered breach-data search since 2018 — its companion Telegram channel states plainly: "Check your credentials for free — @LeakCheck1_Bot." Being an established, named commercial entity rather than an anonymous bot gives it more accountability than most in this category, and the free bot function itself is the safe pattern: check your own email or phone against their breach database.

Worth being clear-eyed about: LeakCheck's broader commercial service, beyond the free Telegram bot, is positioned to security researchers and companies wanting to search breach data more extensively, and reportedly across more identifier types than just email. That is a different product tier from the free self-check bot covered here, but it means the underlying company operates in a space adjacent to more powerful lookup tools — a reason to treat the free bot strictly as a "check my own info" tool and not assume every feature the company offers elsewhere is appropriate for looking up other people.

Use it the same way as any breach checker: enter only your own email or phone, never a password, and treat a "found" result as a prompt to change credentials rather than a full incident report.