eth_call

eth_call executes a read-only message call against the Avalanche C-Chain EVM without broadcasting a transaction or spending any AVAX. The node simulates the call against a chosen block's state and returns the function's raw output, so it is the workhorse behind every "view" lookup on Avalanche — token balances, DEX prices, allowance checks. Point it at https://avalanche.therpc.io/YOUR_API_KEY (chain ID 43114) and nothing is written to the chain; you only read its state.

Use cases

• Read ERC-20 fields such as balanceOf, decimals, symbol, or totalSupply for tokens like USDC or WAVAX on the C-Chain.
• Query DEX pool reserves or spot prices from Trader Joe, GMX, or an Aave market without sending a transaction.
• Simulate a swap or deposit outcome before signing it to catch reverts early and save the AVAX you would have burned on a failed send.
• Apply state overrides (third argument) to test what-if scenarios — e.g. pretend an account holds more AVAX — without touching real chain state.

Parameters

Response

Example request

1curl https://avalanche.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H "Content-Type: application/json" \
4  -d '{
5    "jsonrpc": "2.0",
6    "method": "eth_call",
7    "params": [
8        {
9          "to": "0x0000000000000000000000000000000000000000",
10          "data": "0x"
11        },
12        "latest",
13        {}
14      ],
15    "id": 1
16  }'

Try it live in the Avalanche playground.

Errors & troubleshooting

Common pitfalls

• State at latest can shift between your call and actual transaction inclusion; with ~1–2s C-Chain blocks the window is short but real, so do not treat the result as a settlement guarantee.
• State overrides are not supported by every provider; detect the failure and fall back to a plain call rather than assuming the override applied.
• Reverts come back as JSON-RPC errors (code 3 or -32000), not as a special field in the result — always handle the error path and decode the revert reason from the error data.

Supported networks

• Mainnet — Chain ID: 43114
• Fuji

See also

• eth_estimateGas
• eth_sendRawTransaction
• eth_getStorageAt

1curl https://avalanche.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H 'Content-Type: application/json' \
4  -d '{"jsonrpc":"2.0","id":1,"method":"eth_call","params":[{"to":"0x0000000000000000000000000000000000000000","data":"0x"},"latest"]}'