eth_getUncleByBlockNumberAndIndex — Elysium JSON-RPC

Return an uncle by block and index.

POSThttps://triport.io/rpc/elysium

Network: Elysium mainnet (chain ID 99901)
Scope: elysium:rpc
Auth: X-API-Key: $TRIPORT_API_KEY
Rate limit: elysium_read_rpc - 5 / 10 / 25 / 40 / 40 RPS sustained (Free / Basic / Pro / Business / Enterprise; BE5, 2026-11-08); Limits

Endpoint and plans: Elysium RPC endpoint.

Terms on this page: Chain ID · JSON-RPC.

Request

cURLJavaScriptPython

upstream_observed

curl https://triport.io/rpc/elysium \
  -H "X-API-Key: $TRIPORT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_getUncleByBlockNumberAndIndex","params":["0x270775","0x0"]}'

const res = await fetch("https://triport.io/rpc/elysium", {
  method: "POST",
  headers: {
    "X-API-Key": process.env.TRIPORT_API_KEY,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "jsonrpc": "2.0",
    "id": 1,
    "method": "eth_getUncleByBlockNumberAndIndex",
    "params": [
      "0x270775",
      "0x0"
    ]
  }),
});
const data = await res.json();
console.log(data);

import os


import requests


resp = requests.post(
    "https://triport.io/rpc/elysium",
    headers={
        "X-API-Key": os.environ["TRIPORT_API_KEY"],
        "Content-Type": "application/json",
    },
    json={
        "jsonrpc": "2.0",
        "id": 1,
        "method": "eth_getUncleByBlockNumberAndIndex",
        "params": [
            "0x270775",
            "0x0",
        ],
    },
)
data = resp.json()
print(data)

Response

JSON

Example

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": null
}

eth_getUncleByBlockNumberAndIndex — return an uncle by block and index. Elysium is an Arbitrum Orbit L2 (chain ID 99901) that pays gas in HYPE; the signature and response shape come from the Elysium OpenRPC contract.

Behaviour follows the standard EVM JSON-RPC semantics for this method.

Parameters

JSON-RPC params is a positional array.

blockNumberBlockTagrequired

Block number in hex, or a tag such as latest.

indexQuantityrequired

Zero-based transaction or uncle index in the block, in hex.

Response

Measured 2026-11-08 on Elysium mainnet; captured values in a reconstructed JSON-RPC envelope, not a captured Triport response.

On Elysium

The result on Elysium is null for any index. Because no block has uncles, there is no ommer header at position 0x0 or anywhere else; the capture for block 0x270775 returned null, which is the correct, successful answer and not an error.

Treat null as "nothing at this position". It is not a signal to retry and not a sign that the node is lagging. Code ported from Ethereum mainnet sometimes loops from index 0 until it sees null; on Elysium that loop ends immediately, which is harmless but costs one request per block.

If you are migrating an explorer, you can hide the uncles panel for chain ID 99901 instead of querying it. The reward model also differs from proof-of-work chains: there is no uncle reward to display.

Errors

See Elysium errors. Inspect the code and message together.

Code	Meaning	Action
-32601	Method unavailable	Check the documented method set. A method outside it is rejected earlier with HTTP 403 `method_unknown`.
-32602	Invalid parameters	Correct the request.
-32005	Request limit exceeded	Arrives with HTTP 429: back off and honor Retry-After; see Limits.
-32000	Upstream unavailable	Retry reads with bounded backoff.
HTTP 429 `rate_limited`	Plan RPS exceeded (plain HTTP error, not JSON-RPC)	Honor Retry-After; see Limits.

Examples

JavaScript

const response = await fetch("https://triport.io/rpc/elysium", {
  method: "POST",
  headers: { "X-API-Key": process.env.TRIPORT_API_KEY, "Content-Type": "application/json" },
  body: JSON.stringify({"jsonrpc":"2.0","id":1,"method":"eth_getUncleByBlockNumberAndIndex","params":["0x270775","0x0"]}),
});
const payload = await response.json();

Notes

The result is the view of the healthy node that answered; adjacent calls are not pinned to one node.
For transaction submission, see eth_sendRawTransaction (live). The Triport contract excludes net_listening, net_peerCount, txpool_*, debug_* and trace_*: they are rejected with HTTP 403 method_unknown; see unsupported methods.

eth_accounts · eth_blobBaseFee · eth_blockNumber

Limits · Errors

Parameters

Response

On Elysium

Errors

Examples

Notes

Related