eth_blockNumber

eth_blockNumber reports the head of BNB Smart Chain: the height of the most recently accepted block. BSC is a geth-equivalent EVM secured by PoSA validators and fueled by BNB. It seals a block roughly every three seconds, and sub-second after recent client upgrades, so this counter climbs fast. Point any client at https://bsc.therpc.io/YOUR_API_KEY on chain ID 56. The response is a single hex integer naming the freshest canonical block the node knows about.

Use cases

• Heartbeat probe: the cheapest BSC call to confirm your TheRPC endpoint is alive before issuing heavier requests.
• Anchor a starting height before paginating historical BEP-20 Transfer logs in fixed-size windows.
• Drive a "wait for N confirmations" loop in PancakeSwap or Venus deployment scripts, polling every few seconds as new blocks land.
• Compare the head against a target height to judge how close a transaction sits to BSC's fast deterministic finality.

Parameters

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Response

Example request

1curl https://bsc.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H "Content-Type: application/json" \
4  -d '{
5    "jsonrpc": "2.0",
6    "method": "eth_blockNumber",
7    "params": [],
8    "id": 1
9  }'

Try it live in the BNB Smart Chain playground.

Errors & troubleshooting

Common pitfalls

• The value arrives as a hex string such as "0x2a1b3c0". Run it through parseInt(value, 16) before any arithmetic.
• Because BSC blocks land every few seconds, two calls milliseconds apart often return the same height. A cached response there is expected, not a bug.
• BSC is an L1, so the figure is a real validator-produced block height. There is no L1 batch number to confuse it with, the way a rollup would have.

Supported networks

• Mainnet — Chain ID: 56
• Testnet — Chain ID: 97

See also

• eth_getBlockByNumber
• eth_getBlockByHash
• eth_syncing
• eth_chainId

1curl https://bsc.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H 'Content-Type: application/json' \
4  -d '{"jsonrpc":"2.0","id":1,"method":"eth_blockNumber","params":[]}'