How to track NFT sales

Every Seaport sale emits an OrderFulfilled event from the Seaport contract, and moves the NFT, which emits a transfer on the collection's contract. You can alert on either one.

Seaport's event has no dedicated wording yet, so the headline reads "Order fulfilled" and the decoded arguments follow as lines: the order hash, the offerer, the zone and the recipient. For a filled listing, the offerer is the seller and the recipient is the buyer; for an accepted offer, the roles are the other way around.

The alert does not include the sale price. Seaport records what was paid inside the order's items, and pricing (sale prices, floor prices, USD values) is coming with Premium. The "View on Etherscan" link opens the transaction, where you can see the NFT and the payment.

Seaport 1.6 is in the contract directory at 0x0000000000000068f116a894984e2db1123eb395, so you can pick it by name in the address field. Marketplaces move to newer Seaport versions over time, so check which one your collection's sales go through before you create the rule.

Open a recent sale of the collection on Etherscan, for example from the token's page or from the transaction link on a marketplace's activity tab, and read the "Interacted With (To)" field. That is the contract to watch. If a marketplace settles sales through its own exchange contract instead of Seaport, it won't emit OrderFulfilled; watch that contract with its own event instead, pasting the event signature.

Open the rule and add conditions. All of them must match for an alert to be sent.

Seaport is one of the busiest contracts on Ethereum. A rule on it sees every filled order, and an event is one transaction seen on one watched address. It counts once, whether it matches none, one or several of your rules and however many channels it fans out to. An alert is sent only when a rule matches. Conditions decide which sales alert you; they don't reduce what is counted.

In practice, a Seaport rule would use up the Beta plan's 100 monthly events quickly and suits a paid tier (from 5,000 events a month). When events run out, alerts pause until the period resets. If you only care about one collection, the collection-contract approach below only counts that collection's transfers.

Point the NFT activity template at the collection's contract and every sale arrives as the token moving from the seller to the buyer. The alert doesn't say whether a transfer was a sale, a gift or a move between someone's own wallets, so treat it as a feed of everything that changes hands and open the Etherscan link when a transfer looks interesting.

This is the cheaper option for a single collection, and it also catches sales on marketplaces that don't use Seaport, because every transfer of the token is emitted by the collection's contract.

Sales alerts are about on-chain settlement, nothing more. In particular: