2 Best APIs for Mempool Monitoring in Nigeria

Bitquery is a blockchain data platform that provides unified GraphQL APIs for querying historical and real-time data across more than 40 blockchain networks including Ethereum, Bitcoin, BNB Chain, Solana, Polygon, Tron, and many others. By exposing blockchain data through GraphQL — rather than raw RPC calls or proprietary REST endpoints — Bitquery enables developers to compose precise, efficient queries that return exactly the data they need without over-fetching. For Nigerian developers building blockchain analytics tools, trading platforms, compliance systems, and DeFi applications, Bitquery provides the data infrastructure to power sophisticated multi-chain analysis. Nigeria's blockchain ecosystem spans multiple chains: Nigerian DeFi users trade on Ethereum and BSC, Nigerian NFT creators mint on Polygon and Solana, and Nigerian stablecoin users hold USDT on Tron. Any comprehensive blockchain analytics tool for Nigerian users must cover multiple chains. Bitquery's unified GraphQL schema means Nigerian developers write queries in the same format regardless of which chain they are targeting — only the network parameter changes. DEX (Decentralized Exchange) trade data is one of Bitquery's strongest capabilities. The platform indexes trades from hundreds of DEXes across all supported chains — Uniswap, PancakeSwap, SushiSwap, Raydium, and more. Nigerian trading analytics platforms can query real-time and historical DEX trades by token pair, trader address, DEX protocol, or time range. The ability to compare prices across DEXes simultaneously enables arbitrage detection, best-execution analysis, and market making intelligence. Token analytics queries return holder counts, top holders by balance, token transfer volumes, and holder distribution analysis. For Nigerian token projects or investment research, understanding the distribution of a token's supply — is it concentrated in a few whale wallets or broadly distributed? — is critical information available through Bitquery's token holders endpoint. Money flow analysis tracks how funds move between addresses across the blockchain. This is a powerful tool for both investment research (tracing smart money flows) and compliance (AML, following suspicious funds). Nigerian blockchain compliance companies and crypto businesses subject to VASP regulations can use Bitquery's flow analysis to build transaction monitoring workflows. Real-time data streaming is available via WebSocket subscriptions, enabling Nigerian applications to react to on-chain events as they happen — new DEX trades, new token mints, large transfers, and contract interactions. This is the data foundation for real-time trading alerts, liquidation monitoring systems, and live protocol dashboards. Mempool data (unconfirmed transactions) is available for Bitcoin and Ethereum, enabling Nigerian applications to monitor pending transactions before confirmation — useful for detecting large incoming transfers, front-running detection in trading systems, and transaction fee optimization. The free tier provides 10,000 API points per month — each query consumes points based on the amount of data retrieved. For a Nigerian developer building a prototype or low-traffic tool, the free tier is sufficient to demonstrate functionality. The Basic plan at $99/month provides 1 million points, and the Business plan at $249/month provides 5 million points. All queries are executed via the Bitquery GraphQL IDE (ide.bitquery.io) or programmatically via any GraphQL client — REST wrappers, Apollo Client, and URQL all work.

Crypto APIs is a comprehensive blockchain infrastructure platform providing REST API access to over 20 blockchain networks through a single integration, with a unified endpoint structure that covers blockchain data, wallet management, address monitoring, NFT data, token information, mempool monitoring, and market data. For Nigerian developers who need coverage of multiple chains — Bitcoin for savings, Ethereum for DeFi, Tron for cheap USDT transfers, BNB Chain for trading — Crypto APIs provides a one-stop solution that reduces integration complexity and development time significantly. Nigeria's crypto ecosystem is multi-chain by nature. Nigerian users route different activities through different chains based on transaction costs and speed: Bitcoin for large value transfers and savings, Tron TRC-20 for USDT because the fees are fractions of a cent, Ethereum for DeFi protocols, and BNB Chain for trading at lower gas costs than Ethereum. A Nigerian wallet or payment application serving real users must support this diversity. Without Crypto APIs, building multi-chain support means separate integrations, separate node providers, and separate documentation for every chain. Crypto APIs unifies everything. The Blockchain Data module provides address information, transaction details, and block data for all supported chains. For Bitcoin (and other UTXO chains), this includes UTXO sets, inputs, outputs, and confirmation counts. For Ethereum and EVM chains, this includes internal transactions, event logs, and contract data. The endpoint structure is consistent — the chain name appears in the URL path, but the request/response format is the same — making multi-chain development straightforward. HD (Hierarchical Deterministic) Wallet management covers the full lifecycle: create an HD wallet with a master key, generate receiving addresses, sync the wallet to discover used addresses and balances, and build transactions. Crypto APIs handles all the chain-specific derivation path details, ensuring compatibility with standard wallet specifications. For Nigerian fintech companies building custodial or semi-custodial wallets, this provides a managed wallet infrastructure without the complexity of implementing BIP32/BIP44 from scratch. Address monitoring and webhooks allow subscribing to blockchain events on specific addresses. When a monitored address receives a transaction — whether in the mempool (unconfirmed) or in a confirmed block — Crypto APIs delivers an HTTP webhook notification to the configured endpoint. For Nigerian payment processors and exchanges, this event-driven architecture replaces inefficient polling loops and provides near-real-time payment detection. Webhook events include new incoming transactions, confirmed transactions, and double-spend alerts. NFT data endpoints return metadata, ownership history, and transfer events for ERC-721 and ERC-1155 tokens on Ethereum and other EVM chains. Nigerian NFT platforms can query NFT ownership without building their own indexing infrastructure. Token information endpoints return ERC-20 and BEP-20 token details including name, symbol, decimals, total supply, and holder counts. Mempool monitoring provides visibility into unconfirmed transactions — useful for Nigerian applications that need to detect incoming payments before block confirmation, estimate fee rates for outgoing transactions, or monitor for double-spend attempts on high-value incoming payments. Market data endpoints return current and historical prices for thousands of cryptocurrencies against fiat currencies including USD and, for select providers, NGN. Exchange rates between crypto pairs are available for fee calculation and display purposes. The free tier provides 10,000 credits per month — sufficient for prototyping and low-traffic applications. The Startup plan at $49/month (100,000 credits) serves small Nigerian startups, while the Business plan at $149/month handles production traffic. Enterprise plans with custom SLAs are available for established Nigerian exchanges and financial institutions.