Alkimi

Alkimi runs a decentralised ad exchange: every step of programmatic bidding, the bid request, the bid, the win and the impression, is written to a queryable ledger so an advertiser can check which impressions the budget actually bought. It follows existing OpenRTB and Prebid standards, pushes high frequency bidding off chain into state channels, and has validator nodes sign off on results, balancing throughput with auditability.

It attacks the intermediary fee inside ad tech: one budget passes through SSPs, DSPs and several resale layers, and the share reaching the publisher shrinks with each cut. Alkimi replaces that chain with a fixed percentage fee and makes the flow of fees public. The bid records in its Ads Explorer, the admission and reward rules for validator nodes, and the CPM comparison from UK campaigns are all checkable. A validator must stake to sign, misbehaviour is slashed, and node revenue tracks bidding volume rather than a fixed emission.