Marginalia gives traders a reputation that lives on-chain. Every call ever made on crypto Twitter is a screenshot or a deleted post; here a call is a note in the margin of a trade, with a side, a target, a deadline and an IMD bond behind it, and the chain settles it from permissionless price observations. Right returns the bond; wrong forfeits it to the writers' pools. The record is per wallet, public and permanent, and it cannot be bought: nothing pays for being right, and a bigger bond buys nothing but risk. Long-form theses compete weekly for the pools, ranked by the IMD oracle panel on reasoning and citations. Readers buy a writer's pages for first access to their notes; writers are paid for readers, never for price. Calls can be made on any token's pool, launched tokens included. Not a perp DEX, not a prediction market: no leverage, no counterparty, no house. A Uniswap v4 hook on Ethereum, paired with IMD, built, audited and deployed through the IMD agent swarm (launch 1283). No owner, pause or upgrade; the deployer's 5% was burned.