1 Best APIs for NFT Metadata & Ownership in Nigeria

Covalent provides a Unified API that abstracts blockchain data across more than 100 networks under a single, consistent API structure. Rather than building separate integrations for Ethereum, BNB Chain, Polygon, Avalanche, Arbitrum, Optimism, and dozens of other EVM and non-EVM chains, Nigerian developers can use one API with one key and one endpoint pattern to query any supported network. This dramatically reduces the development time for multi-chain applications — a growing necessity as Nigerian crypto users hold assets across multiple blockchains. Nigeria's crypto-savvy population increasingly operates across chains: trading on Ethereum DEXes, farming yield on BSC, minting NFTs on Polygon, and bridging assets between chains for better gas costs. Any application serving Nigerian users in 2024 and beyond must handle multi-chain data. Covalent is purpose-built for this use case — the same endpoint structure works across all chains, just by swapping the chain_id parameter. The Get Token Balances endpoint (/v1/{chain_id}/address/{address}/balances_v2/) is Covalent's signature feature. It returns every token held by a wallet address — native asset, ERC-20 tokens, and LP tokens — along with current USD prices, logos, and token decimals. For Nigerian wallet apps, this single endpoint can power an entire portfolio overview screen that displays all holdings with current values, without requiring separate price API calls or token metadata lookups. The Get NFT Balances endpoint returns all NFTs held by an address with full metadata: image URL, traits, collection name, floor price, and ownership history. For Nigerian NFT projects and marketplaces, this provides a complete NFT portfolio view without needing to query individual contract APIs or maintain a separate NFT metadata database. The Get Transactions endpoint returns the full transaction history for a wallet, enriched with decoded log events and value transfers. Covalent parses raw Ethereum log data into human-readable decoded events — for example, a Uniswap swap shows up as "Swapped 0.5 ETH for 900 USDC" rather than raw hex log data. This decoded enrichment makes it far easier for Nigerian developers to build transaction history displays. Class A endpoints (token balances, transactions, NFTs) are available on all chains. Class B endpoints provide protocol-specific data for major DeFi protocols: Uniswap, Aave, Compound, Curve, and others. These return user positions, liquidity pool data, and protocol-specific metrics that go beyond generic blockchain data. The Log Events by Topic Hash endpoint enables querying contract events across an entire blockchain by topic, with pagination — effectively enabling blockchain-wide event indexing without running infrastructure. Nigerian developers building analytics tools or protocol monitoring dashboards can use this to track all swaps on a DEX, all mints of an NFT collection, or all liquidations on a lending protocol. The free tier provides 100 requests per minute and covers all Class A endpoints. Premium plans starting at $99/month unlock higher rate limits, Class B DeFi endpoints at higher volumes, and dedicated support. Covalent's credit-based billing means complex queries that return large amounts of data cost more credits than simple queries, providing a fair usage model. API keys are obtained free at covalenthq.com, and no credit card is required to start building.