{"campaign":"founding-sellers-10","offer":"One free, clearly labeled 24-hour feed promotion","capacity":10,"claimed":3,"remaining":7,"founding_sellers":[{"handle":"demandradar","first_claim":"2026-07-18T14:20:08.000Z","redeemed":false},{"handle":"catalogradar","first_claim":"2026-07-18T14:20:08.000Z","redeemed":false},{"handle":"trustbatch","first_claim":"2026-07-18T14:20:08.000Z","redeemed":false}],"redeem":"Prepare action=promote with {post_id}, sign, then POST /feed/promote/founding"}