eth_feeHistory — Elysium JSON-RPC

Return fee-market history.

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 · Base fee · 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":17,"method":"eth_feeHistory","params":["0x3","0x287f17",[25,50,75]]}'

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": 17,
    "method": "eth_feeHistory",
    "params": [
      "0x3",
      "0x287f17",
      [
        25,
        50,
        75
      ]
    ]
  }),
});
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": 17,
        "method": "eth_feeHistory",
        "params": [
            "0x3",
            "0x287f17",
            [
                25,
                50,
                75,
            ],
        ],
    },
)
data = resp.json()
print(data)

Response

JSON

Example

{
  "jsonrpc": "2.0",
  "id": 17,
  "result": {
    "oldestBlock": "0x287f15",
    "reward": [
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ]
    ],
    "baseFeePerGas": [
      "0x5f7b5c0",
      "0x5f7b5c0",
      "0x5f7b5c0",
      "0x5f5e100"
    ],
    "gasUsedRatio": [
      1,
      1,
      0.0028759285714285714
    ]
  }
}

eth_feeHistory — return fee-market history. 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.

Base fee and priority-fee percentiles over a window of blocks. The captured window contains three blocks and four base-fee values, including the next block. Ratios and fees describe that window, not a fixed network guarantee.

Parameters

JSON-RPC params is a positional array.

blockCountQuantityrequired

How many blocks of fee history to return, in hex.

newestBlockBlockTagrequired

Newest block of the requested fee-history window.

rewardPercentilesarrayrequired

Ascending percentiles (0–100) for the priority-fee reward buckets.

Response

Measured 2026-11-08T20:25:43.268Z on Elysium mainnet; complete captured JSON-RPC request and response, not a captured Triport response.

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":17,"method":"eth_feeHistory","params":["0x3","0x287f17",[25,50,75]]}),
});
const payload = await response.json();

Notes

baseFeePerGas has one more entry than gasUsedRatio; reward rows correspond to the requested percentiles.
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

Errors

Examples

Notes

Related