RPC method

eth_getBlockByNumber on Mantle

Supported on SwiftNodes

Everything below was measured on 2026-10-13 by calling eth_getBlockByNumber on Mantle through the same endpoint customers use, and is re-measured weekly.

What eth_getBlockByNumber does

Returns a block by number or tag (latest, safe, finalized, pending, earliest): the header, and either the transaction hashes or the full transactions. Indexers, explorers and wallets use it to follow the chain.

eth_getBlockByNumber on Mantle: what we measured

Header fields	26
Transactions per block	1, 1, 1, 1, 1 in five consecutive blocks
Response size, full transactions (true)	2.6 KB average
Response size, hashes only (false)	1.8 KB
Gas limit	60,000,000
Gas used in the latest block	57,487 (0.096% of the limit)
Base fee	50.00 gwei
Tag "safe"	block 101,881,983
Tag "finalized"	block 101,881,533
Tag "pending"	block 101,882,184
Tag "earliest"	block 0

What is different on Mantle

The header includes the fields added by London (EIP-1559 base fee), Shanghai (withdrawals), Cancun (EIP-4844 blob gas), Cancun (EIP-4788 beacon root), Prague (EIP-7685 requests). Code that assumes Ethereum's current header shape will parse it as is.

5 of the 5 transactions in those five blocks were system transactions (5 × type 0x7e, L1-to-L2 deposit (OP Stack)). They are not user activity: filter them out when counting transactions.

"finalized" was 646 blocks (about 22 min) behind the head.

A real Mantle block header

From block 101,882,178, as our endpoint returned it (long hex values shortened).

{
  "baseFeePerGas": "0xba43b7400",
  "blobGasUsed": "0x0",
  "difficulty": "0x0",
  "excessBlobGas": "0x0",
  "extraData": "0x0100000032000000040000000ba43b7400",
  "gasLimit": "0x3938700",
  "gasUsed": "0xe08f",
  "hash": "0xa0f2f7e077c652c89a20bbb5a6cf047f41d223b24056a00568ce1d06dfb0d379",
  "logsBloom": "0x0000000000000000…(256 bytes)",
  "miner": "0x4200000000000000000000000000000000000011",
  "mixHash": "0x7b64dc7bd1f126c844f84c48696e6f343509b594fe1189f66bf1db070668b70b",
  "nonce": "0x0000000000000000",
  "number": "0x6129942",
  "parentBeaconBlockRoot": "0xf13b5cfac215ea3fff5e9087faa9ee9a6d048d80dfd16f7ba2efe41e478f6ee1",
  "parentHash": "0xd2e72dd2bd708b29508d983532633f6d831fae8a9838357ca661b2ec0618615e",
  "receiptsRoot": "0x72fb0c7c38013bcf1578ce0d41a757b24157a884e243cdcf5b486c9600e19a06",
  "requestsHash": "0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
  "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  "size": "0x390",
  "stateRoot": "0x430ef38483c17500b1af9ed962aa09d21267fddc36db70605c6acee1d96ae8a4",
  "timestamp": "0x6ace248c",
  "transactions": "1 transactions",
  "transactionsRoot": "0x2076144e5b84d041ce59c02d077ce7a45b752f1de30435351f731738dd0e95e9",
  "uncles": [],
  "withdrawals": [],
  "withdrawalsRoot": "0xafefd36ac60f0ee83cf878a9dab0f1ca86e77650940fc453b9718ece6b7b5c02"
}

Example request

curl -s https://rpc.swiftnodes.io/rpc/mantle?key=YOUR_API_KEY \
  -X POST -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_getBlockByNumber","params":["latest",false]}'

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://rpc.swiftnodes.io/rpc/mantle?key=YOUR_API_KEY"),
});

// Header plus transaction hashes (1.8 KB)
const block = await client.getBlock({ blockTag: "latest" });

// With full transactions (2.6 KB on average on Mantle)
const full = await client.getBlock({ blockNumber: block.number, includeTransactions: true });
const userTxs = full.transactions.filter((t) => !["0x7e"].includes(t.typeHex));

// A block that will not be reorganised
const final = await client.getBlock({ blockTag: "finalized" });

Other methods on Mantle

eth_getBlockByNumber on other chains

Frequently asked questions

Does Mantle support eth_getBlockByNumber?

Yes. eth_getBlockByNumber answered on the SwiftNodes Mantle endpoint when our weekly probe called it through the customer path (2026-10-13).

How many transactions are in each Mantle block?

In five consecutive blocks on 2026-10-13: 1, 1, 1, 1, 1.

Mantle endpoints, live block height and WebSocket status are on the Mantle RPC page.

One key covers every chain we serve, and SwiftNodes has a free tier.