BlockSpan is an NFT API platform that allows software companies to develop on blockchain technology. We combine data from multiple chains and offer an API layer to enable NFT developers to retrieve token values, current ownership, metadata, and cached images in real-time. It doesn't take much to support multiple blockchains or switch chains. Instead of scraping block logs, you can write a simple rest integration. Our API returns more than transaction data. It also returns price, current owner, metadata and other information. Currently, Ethereum, Polygon and Arbitrum are supported. More will be added in the future. We have extensive documentation that includes an interactive API console for each endpoint. Our NFT API supports token metadata and cached image URLs, saving API and IPFS calls to fetch this data.