25stamps.club is an online community for collectors to exchange used postage stamps with other members around the world. Its straightforward exchange model lets a participant send 25 used stamps to a randomly selected member and, once the shipment is registered, receive 25 stamps from another randomly selected member. Each exchange is tracked with an ID that the sender writes on the envelope and the recipient registers when it arrives. The site specifies that stamps should be in good condition and that the set should contain unique stamps, with no duplicates; participants may also include extra surprises.

The platform supports registration and sign-in, and provides exchange rankings, discussions, information about the service, FAQs, and participation terms. Its public exchange listings show member names, countries, and recent activity, while site statistics report completed and ongoing exchanges, active members, and daily exchange volume. Available in English and Romanian, 25stamps.club is operated and owned by NODE HUB S.R.L.