NFT API
Blockchain NFT data made simple
BlockSpan is an NFT API platform for software companies developing on the blockchain. We aggregate data from multiple chains and provide an API layer to allow NFT developers to retrieve token prices, current ownership, and metadata including cached images in real time.
Build multi-chain apps with speed
Supporting multiple blockchains, or switching chains, doesn't have to be difficult.
You can stop scraping block logs and write a simple rest API integration instead.
Normalized NFT data
More than just transaction data, our API returns price, current owner, metadata, and more
Multiple blockchains
Ethereum, Polygon, Arbitrum, and Optimism supported today, with more coming soon
Well documented
We've written extensive documentation for each endpoint that includes an interactive API console
More than just on-chain data
Our NFT API includes token metadata and cached image urls, saving making API and IPFS calls to fetch that data.
{
"token_type": "erc721",
"contract_address": "0xcf3bc939f9b2487092936f21cc0757b2b523b7aa",
"id": "1011",
"token_name": "RoyalFool #1011",
"token_description": "I will do whatever i can to make you laugh",
"uri": "https://gateway.pinata.cloud/ipfs/QmSpL6rVyrjZuFYKRiocL73d93eFa8DDaduuwmPKRoybRW/1011.json",
"metadata": {
"image": "https://gateway.pinata.cloud/ipfs/QmNRF38Yad2tHekCKspTxkLEha46BfrsfP27AHJGtQJCCk/1011.jpg",
"attributes": [
{
"value": "Imbecile",
"trait_type": "Head"
},
{
"value": "Circo",
"trait_type": "Ears"
}
]
},
"total_transfers": 1,
"minted_at": "2022-09-26T21:02:35.000Z",
"total_current_owners": 1,
"current_owners": [
{
"address": "0x584d5f4b389f6b1b8a09ccd0a64bfad6354ce39e"
"quantity": "1"
}
],
"recent_price": {
"contract_address": "0xcf3bc939f9b2487092936f21cc0757b2b523b7aa",
"id": "1011",
"hash": "0x71e22c9b12260f4844212b81c8be7dfe1ff0dcfde30ed4b1e415bcb33bfed93d",
"from_address": "0x17b4cd801fa39ec4c28a21b3e07bbb97a075f4c1",
"to_address": "0x584d5f4b389f6b1b8a09ccd0a64bfad6354ce39e",
"date": "2022-09-26T21:02:35.000Z",
"quantity": "1",
"price": "75000000000000000"
},
"cached_images": {
"tiny_100_100": "https://cdn.blockspan.com/53616c7465645f5f8d0/03a316921180e4618d89d6b0e2253b1fb74b12f2ca42869ce6c560bf3f451d1ef134c8f52816986fe68091993da329cc30b6d0a25c49b2ee471b7109a4b82184ba0ea7d06e6674e10531588f50f11497347a664dff6aec1783540d969f5cbb6df098cd8bc6127_100_100.jpg",
"small_250_250": "https://cdn.blockspan.com/53616c7465645f5f8d0/03a316921180e4618d89d6b0e2253b1fb74b12f2ca42869ce6c560bf3f451d1ef134c8f52816986fe68091993da329cc30b6d0a25c49b2ee471b7109a4b82184ba0ea7d06e6674e10531588f50f11497347a664dff6aec1783540d969f5cbb6df098cd8bc6127_250_250.jpg",
"medium_500_500": "https://cdn.blockspan.com/53616c7465645f5f8d0/03a316921180e4618d89d6b0e2253b1fb74b12f2ca42869ce6c560bf3f451d1ef134c8f52816986fe68091993da329cc30b6d0a25c49b2ee471b7109a4b82184ba0ea7d06e6674e10531588f50f11497347a664dff6aec1783540d969f5cbb6df098cd8bc6127_500_500.jpg",
"large_1000_1000": "https://cdn.blockspan.com/53616c7465645f5f8d0/03a316921180e4618d89d6b0e2253b1fb74b12f2ca42869ce6c560bf3f451d1ef134c8f52816986fe68091993da329cc30b6d0a25c49b2ee471b7109a4b82184ba0ea7d06e6674e10531588f50f11497347a664dff6aec1783540d969f5cbb6df098cd8bc6127_1000_1000.jpg",
"original": "https://cdn.blockspan.com/53616c7465645f5f8d0/03a316921180e4618d89d6b0e2253b1fb74b12f2ca42869ce6c560bf3f451d1ef134c8f52816986fe68091993da329cc30b6d0a25c49b2ee471b7109a4b82184ba0ea7d06e6674e10531588f50f11497347a664dff6aec1783540d969f5cbb6df098cd8bc6127.jpg"
}
}
The powerful and flexible cross-
chain NFT API
The BlockSpan NFT REST based API provides access to comprehensive NFT metadata, activity and ownership information in real-time. Take advantage of our fuzzy matching search capabilities on token metadata for improved ability to find and understand the competitive NFT landscape. Leverage the collection price summary to research sales activity and trends.
300M
300 million ERC721 and ERC1155 tokens.
500K
500 thousand token contracts.
1B
1 billion token transfer transactions.

Collections
Collections endpoints facilitate discovery of new collections (aka contracts) along with exploring contracts belonging to a wallet.
Tokens
Tokens endpoints simplify discovery and retrieval of NFT metadata, transactions, prices, and owner information.
Transfers
Transfers endpoints simplify understanding the various activities on the chain including ownership history, transaction volume, etc.
Get started with BlockSpan today
Begin building multi-chain apps with our easy-to-use NFT API