TriportRPC
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eth_call

Polygon / https://triport.io/polygon

Minimum tier: Free

Polygon method guide

Last updated:

eth_call runs a message call locally on a Polygon node and returns whatever the contract's code would return, without broadcasting a transaction, mining a block, or changing any state. It is the workhorse for reading on-chain data: token balances (balanceOf), allowances, pool reserves, oracle prices, and any other view/pure function or simulated state-changing call.

Because the call is executed in-memory against a chosen block, you get an instant, gas-free answer. Use it whenever you need to read contract state or simulate the outcome of a call before sending a real transaction. To actually broadcast a state change, use eth_sendRawTransaction instead.

Gotchas

  • The data field must be the ABI-encoded calldata — a 4-byte function selector followed by the 32-byte-padded arguments. Build it with a library (ethers/web3/viem) rather than by hand.
  • A reverting contract returns an error (with the revert reason when available), not an empty result. Always handle the error path.
  • Results reflect the state at the requested block tag. Omitting the tag means latest, which can change between calls.
  • Batch your reads. Calling eth_call once per token/account burns your rps budget fast. Route many reads through Multicall3 at 0xcA11bde05977b3631167028862bE2a173976CA11 (same address on Polygon) and collapse dozens of reads into a single eth_call.

Parameters

This method takes no parameters.

Returns

eth_call return value
FieldType
resultobject

Examples

curl https://triport.io/polygon \
  -X POST -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <api-key>' \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_call","params":[]}'
const res = await fetch("https://triport.io/polygon", {
  method: "POST",
  headers: { "Content-Type": "application/json", Authorization: "Bearer <api-key>" },
  body: JSON.stringify({
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_call",
  "params": []
}),
});
const data = await res.json();
import requests
resp = requests.post(
    "https://triport.io/polygon",
    headers={"Authorization": "Bearer <api-key>"},
    json={"jsonrpc":"2.0","id":1,"method":"eth_call","params":[]},
)
print(resp.json())

Usage

  1. Transport: HTTP (JSON-RPC).
  2. Chain: Polygon.
  3. Clusters: mainnet.
  4. Credit cost: 1 per call.

FAQ

What does eth_call do?
Executes a read-only smart-contract call against the current (or a historical) Polygon state, returning the raw result without creating a transaction or spending gas.
How many credits does eth_call cost?
eth_call costs 1 credit(s) per call on Triport by default.
Is eth_call available over WebSocket?
eth_call is an HTTP JSON-RPC method.