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.

Photo of blockchains

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": "",
  "metadata": {
    "image": "",
    "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": "",
    "small_250_250": "",
    "medium_500_500": "",
    "large_1000_1000": "",
    "original": ""

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.


300 million ERC721 and ERC1155 tokens.


500 thousand token contracts.


1 billion token transfer transactions.

Photo of NFT artist at work

Collections endpoints facilitate discovery of new collections (aka contracts) along with exploring contracts belonging to a wallet.


Tokens endpoints simplify discovery and retrieval of NFT metadata, transactions, prices, and owner information.


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