I’m trying to figure out how NFT pricing works on marketplaces like OpenSea. When someone lists their NFT for sale, where exactly does that price information get stored?
Is the listing price recorded directly on the blockchain, or does OpenSea just keep it in their own database? I’m asking because I want to build a tool that can fetch current prices for all tokens in a specific NFT collection.
Scraping OpenSea’s website directly is a pain because they use lazy loading for the data, and I really don’t want to mess around with Selenium if I can avoid it.
Main question: Is there a way to get NFT listing prices without going through OpenSea’s website? Maybe through blockchain data or some API I don’t know about?
Really interesting question! I’ve been wondering the same thing.
Most marketplaces like OpenSea don’t store listing prices on-chain - gas fees would be insane. You’d pay every time you changed your price.
They keep this stuff in their own databases and only put the actual sale on the blockchain when someone buys. That’s why you see sale prices on-chain but not all the listing attempts.
Have you checked OpenSea’s API? They’ve got endpoints that might work without scraping. Also worth looking at LooksRare or X2Y2 - they handle data differently.
Are you tracking price changes over time or just current listings? Historical data gets stored differently depending on the marketplace.
What collection are you tracking? There might be collection-specific tools or APIs that’d help.
From building similar tools, listing prices live in the marketplace’s database, not on-chain. Only completed sales hit the blockchain because of gas costs. OpenSea has an API but it’s unreliable - constant rate limits and changes. I use multiple approaches: check if the collection has its own API first, then fall back to Ankr or QuickNode for NFT data. Different marketplaces store pricing differently. Some collections mainly list on LooksRare or Magic Eden instead of OpenSea, so you’ll miss stuff checking just one source. Cross-referencing multiple platforms gives better coverage but makes your code more complex.
opensea’s api can be a pain, yeah. moralis or alchemy are good choices too. they aggregate data so you can avoid the hassle of scraping. also check out reservoir protocol - it’s aimed at nft market data across many platforms, might save you some time!