Understanding the specifics of a Non-Fungible Token (NFT) is crucial for developers, traders, and collectors. An NFT API provides a structured way to access this data programmatically. This guide explains how to use a specific API endpoint to fetch comprehensive details about any NFT, including its metadata, collection information, and contract details.
Understanding the NFT Detail Endpoint
This interface is designed to return extensive information about a single NFT asset. By providing a few key pieces of information, you can retrieve everything from the token's name and image to the finer details of its smart contract and overarching collection. This data is essential for building applications like NFT marketplaces, wallets, or analytics dashboards.
API Request Structure
To successfully call the API, you need to construct a request with the correct parameters.
Request Address and Method
The endpoint uses a GET request to the following address:https://web3.okx.com/api/v5/mktplace/nft/asset/detail
Required Parameters
Three parameters are mandatory for a successful API call:
- chain: A string representing the blockchain network where the NFT resides (e.g., Ethereum, Solana). You must use a chain name from the list of supported blockchains.
- contractAddress: A string that must be a valid smart contract address for the NFT collection.
- tokenId: A string representing the unique identifier of the specific NFT within its collection.
Interpreting the API Response
A successful API call returns a JSON object packed with valuable information. Here’s a breakdown of the key response parameters you can expect.
Core Token Identification
- name: The specific name of the NFT.
- tokenId: The unique token ID that identifies this NFT within its collection.
- tokenUri: The address (often an IPFS hash or a URL) where the NFT's full metadata JSON file is stored.
Media Resources
The API provides several links to cached media files for reliable and fast access.
- image: The primary image URL for the NFT item.
- imagePreviewUrl: A smaller, preview version of the primary image.
- imageThumbnailUrl: A thumbnail-sized version of the image.
- animationUrl: If the NFT is a video, audio, or other animated format, this field provides the URL to that resource.
Detailed Metadata and Context
- attributes: An object containing the NFT's traits or properties (e.g., Background, Eyes, Hat for a profile picture project), following a standardized attributes model.
- assetContracts: An object detailing the smart contract that governs the NFT, based on an asset contract model. This includes information like the contract schema and creator earnings.
- collection: An object containing high-level information about the entire collection the NFT belongs to, such as its name, description, and total supply, following a collection model.
Practical Use Cases for NFT Data
Accessing this detailed data enables numerous Web3 applications.
- Marketplace Listings: Display comprehensive NFT information, including attributes and collection stats, on a product page.
- Portfolio Trackers: Allow users to see all the metadata and artwork for the NFTs they own in one place.
- Analytics Platforms: Aggregate and analyze trait rarity across collections to provide insights to users.
- Gaming Applications: Verify NFT ownership and its specific properties to grant in-game benefits or access.
👉 Explore more strategies for integrating NFT data
Frequently Asked Questions
What exactly does the NFT Detail API return?
It returns a comprehensive dataset for a single NFT, including its core identification (name, tokenId), media links (image, animation), its traits (attributes), and contextual information about its collection and smart contract.
Why are all three parameters (chain, contractAddress, tokenId) required?
These three elements together form a unique identifier for any NFT across all blockchains. The chain specifies the network, the contractAddress points to the specific collection, and the tokenId identifies the exact token within that collection.
What is the difference between image, imagePreviewUrl, and imageThumbnailUrl?
These are cached versions of the asset at different resolutions. The image is typically the full-size version, the preview is a mid-sized version suitable for display in lists, and the thumbnail is a small, fast-loading icon.
Where does the original metadata come from?
The original data is stored in a JSON file at the location specified by the tokenUri. The API fetches and caches this data, providing the URLs to the cached images and parsed attributes for reliability and speed.
Can I use this API to get data for any NFT?
Yes, as long as the NFT's blockchain is supported by the API and you have the correct contract address and token ID, you can retrieve its details.
How do I find the correct contract address for an NFT collection?
The most reliable sources are the official project website, reputable NFT marketplaces like OpenSea or LooksRare, or blockchain explorers like Etherscan for Ethereum-based projects. Always verify the address to avoid scams.