Binance Smart Chain（BSC）自定义代币余额获取及ABI相关技术问询

Great questions! Let's break this down clearly for checking Binance Smart Chain (BSC) token balances:

Yes—you absolutely can, at least for ERC20-compatible tokens (which make up the vast majority of BSC tokens). Here's how:

ERC20 defines standard function signatures for core methods like balanceOf(address) and decimals(), which have fixed hexadecimal identifiers:

• balanceOf: 0x70a08231
• decimals: 0x313ce567

You can construct raw call data using these signatures, no full ABI required:

1. For balanceOf, take the target wallet address, strip the 0x prefix, pad it to 64 characters (32 bytes) with leading zeros.
2. Append this padded address to the balanceOf function signature to create your call data.
3. Use BSC's JSON-RPC eth_call method to send this data to the token's contract address.
4. The result will be a 32-byte hex string—convert it to a decimal, then divide by 10^decimals (you can fetch decimals the same way using its function signature).

Here's a quick JavaScript example using a Web3 provider:

const provider = new ethers.providers.JsonRpcProvider("https://bsc-dataseed.binance.org/");
const walletAddress = "0xYourWalletAddress";
const busdContract = "0xe9e7CEA3DedcA5984780Bafc599bD69ADd087D56";

// Fetch balance
const paddedWallet = walletAddress.slice(2).padStart(64, "0");
const balanceCallData = `0x70a08231${paddedWallet}`;
const balanceHex = await provider.send("eth_call", [{ to: busdContract, data: balanceCallData }, "latest"]);
const balanceRaw = parseInt(balanceHex, 16);

// Fetch decimals to format the balance
const decimalsCallData = "0x313ce567";
const decimalsHex = await provider.send("eth_call", [{ to: busdContract, data: decimalsCallData }, "latest"]);
const decimals = parseInt(decimalsHex, 16);

const humanReadableBalance = balanceRaw / (10 ** decimals);
console.log(`BUSD Balance: ${humanReadableBalance}`);

Caveat: This only works for standard ERC20 tokens. Non-standard tokens (with custom function signatures for core methods) will break this approach.

If you need full ABIs (for non-standard tokens, event listening, or more complex interactions), there are reliable ways to auto-fetch or generate ABIs at scale:

• SaaS Web3 Data APIs: Many enterprise-grade Web3 data services offer ABI lookup endpoints. These tools combine chain-scraped bytecode, reverse-engineering, and community-curated data to return usable ABIs even for unverified contracts. Most support bulk queries, which is perfect for processing large volumes of transaction tokens.
• Bytecode Reverse-Engineering Tools: Open-source tools like evmdis or libraries (e.g., Python's pyevmasm) can parse contract bytecode to extract function signatures and generate a basic ABI. While this won't include parameter names (only types), it's sufficient for most read operations like balanceOf. You can integrate these tools into your backend to process contracts on-demand.
• Community-Curated ABI Repositories: Some decentralized communities maintain databases of ABIs for popular (and even less common) contracts. While not 100% comprehensive, these can fill gaps when other methods fail—just be cautious about data accuracy.

Note: Reverse-engineered ABIs won't have the same detail as verified ABIs (like parameter names or NatSpec comments), but they're fully functional for interacting with contract methods. For the widest coverage, combining a SaaS API with bytecode reverse-engineering is a solid approach.

内容的提问来源于stack exchange，提问作者Bahadir Karaagac