eth_blockNumber — Ethereum JSON-RPC

Status: Available

Returns the number of the most recent block on the Ethereum chain.

POSThttps://triport.io/eth

Network: Ethereum
Scope: eth_read_rpc
Auth: x-token: $TRIPORT_API_KEY (or Authorization: Bearer)
Rate limit: free 10 RPS sustained · up to 20 burst · basic 20 RPS sustained · up to 40 burst · pro 100 RPS sustained · up to 200 burst · business 250 RPS sustained · up to 500 burst; Burst capacity

Endpoint and plans: Ethereum RPC endpoint.

Request

cURLJavaScriptPython

curl https://triport.io/eth \
  -H "Authorization: Bearer $TRIPORT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "eth_blockNumber",
    "params": []
  }'

const res = await fetch("https://triport.io/eth", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.TRIPORT_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "jsonrpc": "2.0",
    "id": 1,
    "method": "eth_blockNumber",
    "params": []
  }),
});
const data = await res.json();
console.log(data);

import os


import requests


resp = requests.post(
    "https://triport.io/eth",
    headers={
        "Authorization": f"Bearer {os.environ['TRIPORT_API_KEY']}",
        "Content-Type": "application/json",
    },
    json={
        "jsonrpc": "2.0",
        "id": 1,
        "method": "eth_blockNumber",
        "params": [],
    },
)
data = resp.json()
print(data)

Response

JSON

Example

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x149e2c1"
}

eth_blockNumber returns the index of the latest block the node has seen, encoded as a 0x-prefixed hexadecimal string. It takes no parameters and is the canonical way to learn the current chain head.

Use it to track chain progress, to pick a concrete latest block height before issuing a batch of historical reads, or as a lightweight liveness/health probe against the RPC endpoint. The value advances roughly once every ~12 seconds on Ethereum mainnet.

Because the result is hex, remember to convert it before using it as a decimal number — e.g. parseInt("0x149e2c1", 16) → 21619905.

Parameters

This method takes no parameters; pass an empty array.

_(none)_arrayrequired

Must be [].

Response

Response fields

Field	Type	Description
`jsonrpc`	`string`	JSON-RPC version, always `"2.0"`.
`id`	`number`	Echoes the request `id`.
`result`	`string`	Latest block number as a `0x`-prefixed hex string (e.g. `0x149e2c1` = `21619905`).

Errors

Code	Meaning	When it happens
`401`	`trial_expired`	The account's trial period has ended.
`403`	`tier_insufficient`	The account's tier does not grant access to this method.
`429`	`rate_limited`	The per-tier RPS limit was exceeded. Back off and retry.
`401`	`subscription_expired`	The account's paid subscription has lapsed.
`401`	`unauthorized`	Missing or invalid API key.
HTTP `403`	`method_unknown`	The method name is not recognized.

See errors.md for the full error envelope and handling guidance.

Examples

JavaScript (fetch)

JavaScript

const res = await fetch("https://triport.io/eth", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.TRIPORT_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    jsonrpc: "2.0",
    id: 1,
    method: "eth_blockNumber",
    params: [],
  }),
});


const { result } = await res.json();
console.log("latest block:", parseInt(result, 16)); // 21619905

Notes

The result is a hex string, not a number — convert with base 16 before arithmetic.
eth_blockNumber is available on the Free trial (eth_read_rpc category).
Rate limiting is RPS-per-tier with burst; there is no daily quota. An HTTP 429 rate_limited error means you should back off and retry shortly.
To fetch the block itself, follow up with eth_getBlockByNumber. To read the current gas price alongside the head, see eth_gasPrice.