Binance Smart Chain API: A Complete Guide to BNB Chain Indexing (BSC API)

Introduction to BNB Chain

On September 1st, Binance launched one of its most anticipated projects—the BNB Chain. This EVM-compatible blockchain enables developers to create decentralized applications (DApps) and digital assets with ease. Designed to address Ethereum's scalability issues, BNB Chain offers seamless migration for Ethereum DApps thanks to its Ethereum Virtual Machine (EVM) compatibility and Solidity support.

Why BNB Chain?

Scalability: Solves Ethereum's congestion and high gas fees.
EVM Compatibility: Copy-paste Ethereum smart contracts to BSC—no code changes needed.
Developer-Friendly: Supports existing Ethereum tools and frameworks.

Migrating DApps to BNB Chain

Challenges in Ethereum DApp Migration

While migrating smart contracts is straightforward, displaying on-chain data to users requires running a BNB Chain node, indexing data, and managing APIs. This complexity often hinders developers.

Bitquery’s Solution

Bitquery simplifies this process by offering GraphQL APIs for querying on-chain data. Think of it as The Graph Protocol for BNB Chain—but without needing subgraphs.

Key Features:

GraphQL Endpoint: graphql.bitquery.io (includes a playground for testing queries).
Protocol Categorization: BNB Chain falls under "Ethereum Type" protocols.
Real-Time Data: Access mainnet (bsc) and testnet (bsc_testnet) data effortlessly.

Practical Examples: Querying BNB Chain Data

1. Oracle Smart Contract Event API (Band Protocol)

Use Case: Fetch price updates from an oracle contract deployed on BSC testnet.

GraphQL Query:

{
  ethereum(network: bsc_testnet) {
    smartContractEvents(
      smartContractEvent: {is: "RefDataUpdate(string,uint64,uint64,uint64)"},
      smartContractAddress: {is: "0x352aaf9ad953d1edd41c872a84bfa70b6374c87a"}
    ) {
      transaction { hash }
      block { height timestamp }
      arguments { value argument }
    }
  }
}

Result: Returns price updates (e.g., PBTC rate) with timestamps and transaction details.

2. Latest Transactions on BSC

Query:

{
  ethereum(network: bsc) {
    transactions(options: {desc: "block.height", limit: 10}) {
      block { height timestamp }
      address: sender { address }
      hash
      gasValue
    }
  }
}

Output: Lists recent transactions with block height, sender address, and gas fees.

3. Token Transfer Analytics

Query: Top 10 transferred tokens on BSC.

{
  ethereum(network: bsc) {
    transfers(options: {desc: "count"}, amount: {gt: 0}) {
      currency { symbol address }
      count
      amount
    }
  }
}

Result: Shows token symbols (e.g., BNB, Cake), transfer counts, and total amounts.

FAQ Section

Q1: Is BNB Chain compatible with Ethereum tools?

A: Yes! BSC supports MetaMask, Truffle, and other Ethereum dev tools.

Q2: How do I access BSC testnet APIs?

A: Use network: bsc_testnet in your Bitquery GraphQL requests.

Q3: What’s the difference between BSC and Ethereum APIs?

A: Structurally similar, but BSC offers faster transactions and lower costs.

Q4: Can I index historical BSC data?

A: Yes—Bitquery archives all BSC data since genesis.

Advanced Use Cases

👉 Explore BNB Chain Explorer for real-time analytics.

DeFi Tracking: Monitor PancakeSwap liquidity pools.
NFT Analytics: Query BSC-based NFT transfers.
Smart Contract Audits: Verify contract interactions.

Wrapping Up

BNB Chain is a game-changer for DApp developers. With Bitquery’s APIs, you can:
✅ Skip node maintenance.
✅ Fetch real-time data.
✅ Build scalable DApps.

👉 Start querying BSC data today.

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