Delivered data events of one chain; each successful page costs 25 CU.

Only delivered data events, ordered by (block, position in block, replay_epoch). Both block bounds omitted selects the last hour by block time up to delivered_through_block; one omitted bound selects an hour relative to the other. A window longer than 24 hours or from_block after to_block is 400 invalid_request. History is retained for at most 30 days and may restart after storage loss; an older from_block is 422 block_out_of_range. Offline subscriptions can read history. Tokens bind all query parameters. Each account has at most two concurrent queries; the platform storage share is also bounded.