eth_getBlockByHash on Arbitrum One
Fetches a full block by its hash. Identical payload to eth_getBlockByNumber but keyed on the 32-byte block hash.
Use it when you already hold a hash (from a log or a parent-hash walk) and need reorg-safe lookup: unlike a block number, a hash pins one specific block even across a reorg.
Arbitrum One endpoint (public — no key)
https://rpc.nodeflare.app/arb/publicMethod
eth_getBlockByHash
Cost
2 CU
Chain ID
42161
Block time
~250 ms
Finality
<1 s sequencer · L1-final ~13 min
Blocks on Arbitrum One
Arbitrum produces blocks on demand, as fast as ~250 ms apart — the fastest cadence of any chain we serve. block.number is the L2 block; a single day can span hundreds of thousands of blocks.
Parameters
[blockHash, fullTransactions:boolean]cURL
curl https://rpc.nodeflare.app/arb/public \
-X POST \
-H 'content-type: application/json' \
-d '{"jsonrpc":"2.0","method":"eth_getBlockByHash","params":["0x0000000000000000000000000000000000000000000000000000000000000000", false],"id":1}'ethers.js
import { ethers } from 'ethers';
const provider = new ethers.JsonRpcProvider(
'https://rpc.nodeflare.app/arb/public'
);
const result = await provider.send('eth_getBlockByHash', ["0x0000000000000000000000000000000000000000000000000000000000000000", false]);Try it live
Runs the example above against the public Arbitrum One endpoint — straight from your browser.
eth_getBlockByHash on Arbitrum One — FAQ
How do I call eth_getBlockByHash on Arbitrum One?
POST a JSON-RPC 2.0 request with "method": "eth_getBlockByHash" to NodeFlare's Arbitrum One endpoint at https://rpc.nodeflare.app/arb/public. No API key is required for the public endpoint.
What does eth_getBlockByHash cost on the free tier?
eth_getBlockByHash is weighted at 2 compute units per call. The free tier includes 2,000,000 CU/month, so that is roughly 1,000,000 eth_getBlockByHash calls per month — no credit card.
Is eth_getBlockByHash available on the public Arbitrum One endpoint?
Yes. eth_getBlockByHash works on the public Arbitrum One endpoint (https://rpc.nodeflare.app/arb/public) with no API key, rate-limited per IP. A free key adds higher limits and a dedicated path.
Anything Arbitrum One-specific to know when using eth_getBlockByHash?
Arbitrum produces blocks on demand, as fast as ~250 ms apart — the fastest cadence of any chain we serve. block.number is the L2 block; a single day can span hundreds of thousands of blocks.
Call eth_getBlockByHash on Arbitrum One with a free key
2,000,000 compute units/month, heavy methods unlocked, every chain included. No credit card.
Get your free API key →eth_getBlockByHash on other chains
Other Arbitrum One methods
← All Arbitrum One RPC docs