Blockchain Data Infrastructure (NFT, Token, Transfer APIs + Real-Time Streaming)

Comprehensive blockchain data indexing infrastructure transforming raw on-chain data into structured, queryable formats with real-time streaming capabilities. Alchemy's Data Infrastructure provides REST APIs, GraphQL endpoints, webhooks, and WebSocket connections for accessing indexed NFT, token, and transaction data across all major blockchains.

NFT Data Indexing

Complete NFT Metadata: Retrieve NFT metadata including images, attributes, descriptions with automatic IPFS resolution and CDN optimization

Ownership & Transfer Tracking: Real-time NFT ownership queries by wallet, contract, or token ID with complete transaction history including mints, transfers, sales, and burns

Collection Analytics: Aggregate collection-level statistics, floor prices, trading volume, and rarity data integration

Spam Detection: Built-in filtering of spam and scam NFTs to protect users

Supports ERC-721 and ERC-1155 standards with batch queries and historical snapshots. Powers NFT marketplaces like OpenSea, portfolio tracking applications, gaming platforms, and digital collectibles platforms.

Token & Transfer Data

Real-Time Token Pricing: Current token prices with millisecond updates, historical price data, OHLCV candlestick data, and market capitalization metrics

Comprehensive Transfer History: Complete asset transfer tracking for native tokens (ETH, SOL, MATIC), ERC-20 tokens, NFTs, and internal smart contract transactions with USD value calculations

Token Metadata: Symbol, name, decimals, total supply, contract address, holder statistics, and trading pairs across DEXs and CEXs

Advanced Capabilities: Spam token filtering, transfer aggregation by time periods, cross-chain transfer correlation, and transfer pattern analysis for compliance

Aggregates data from major DEXs (Uniswap, SushiSwap, PancakeSwap, Curve) and CEX pricing sources. Powers DeFi platforms, portfolio trackers, tax reporting software, accounting platforms, and trading analytics.

Real-Time Data Streaming

Webhooks: Push notifications for address activity, smart contract events, NFT activity, token transfers, gas price changes, mined transactions, and dropped transactions with guaranteed delivery and automatic retries

WebSockets: Persistent bidirectional connections for real-time block data, pending transactions, event subscriptions, and log streaming with sub-50ms latency, automatic reconnection, and zero dropped messages

Event Management: Custom filtering for precise event targeting, subscription management, message compression, and support for thousands of concurrent subscriptions

Powers real-time dashboards, trading platforms, DeFi protocols with time-sensitive operations, notification systems, trading bots, fraud detection, and blockchain explorers.

Multi-Chain Support

Unified API across 80+ blockchain networks including Ethereum, Solana, Polygon, Arbitrum, Optimism, Base, and all major Layer 1 and Layer 2 chains with real-time indexing and sub-second latency.

Performance

Sub-100ms response times globally with 99.99% uptime. Handles billions of data requests monthly with automatic scaling. RESTful APIs with comprehensive SDKs (JavaScript, Python, Ruby), GraphQL support for flexible queries, detailed documentation, and testing sandbox environments.