eth_sendRawTransactionSync | Polygon

Polygon API method that submits a signed transaction and blocks until the transaction receipt is returned or the timeout expires. On Polygon.

POST /0615fdf3c9eaf0681469e61a4308ea09

eth_sendRawTransactionSync

cURL

curl --request POST \
  --url https://polygon-mainnet.core.chainstack.com/0615fdf3c9eaf0681469e61a4308ea09 \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "eth_sendRawTransactionSync",
  "params": [
    "0xf86c808504a817c80082520894ab5db0e98b8ea6b7f9d8ad8e8ed0bc8fba0d1a2f870de0b6b3a764000080821b9f",
    "0x1388"
  ],
  "id": 1
}
'

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "transactionHash": "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
    "blockHash": "0xabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcd",
    "blockNumber": "0x12345",
    "gasUsed": "0x5208",
    "status": "0x1"
  }
}

Polygon API method that submits a signed transaction and blocks until the transaction receipt is returned or the timeout expires. This is a synchronous version of eth_sendRawTransaction — instead of returning just the transaction hash, it waits for the transaction to be included in a block and returns the full receipt.

Hex-encoded timeout

Polygon’s Bor client predates EIP-7966, and its timeout parameter is typed as hexutil.Uint64. You must pass the timeout as a hex-encoded value (e.g., "0x1388" for 5000 ms), not as a decimal integer like on Base, Ethereum, or other EIP-7966-conformant implementations. Passing a decimal integer returns invalid argument 1: json: cannot unmarshal non-string into Go value of type hexutil.Uint64.

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Parameters

• signedTransactionData — the signed transaction data in hexadecimal format. Includes nonce, gas price, gas limit, recipient address, value, data, and signature.
• timeout (optional) — maximum wait time in milliseconds, passed as a hex-encoded uint64 string (e.g., "0x1388" for 5000 ms). If omitted, the node uses its configured default.

Response

• result — the full transaction receipt object once the transaction is included in a block, with the same fields as eth_getTransactionReceipt. If the timeout expires before inclusion, the node returns an error.

eth_sendRawTransactionSync code examples

ethers.js

const ethers = require('ethers');
const NODE_URL = "CHAINSTACK_NODE_URL";
const provider = new ethers.JsonRpcProvider(NODE_URL);

const sendTransactionSync = async () => {
  const wallet = new ethers.Wallet("YOUR_PRIVATE_KEY", provider);

  const tx = {
    to: "0xRecipientAddress",
    value: ethers.parseEther("0"),
    chainId: 137,
  };

  // Sign the transaction
  const signedTx = await wallet.signTransaction(tx);

  // Send synchronously — Bor expects a HEX-encoded timeout
  const receipt = await provider.send(
    "eth_sendRawTransactionSync",
    [signedTx, "0x1388"] // 5000 ms in hex
  );
  console.log(`Confirmed in block: ${receipt.blockNumber}`);
  console.log(`Status: ${receipt.status}`);
};

sendTransactionSync();

When to use

Use eth_sendRawTransactionSync instead of eth_sendRawTransaction when:

• You need the receipt immediately and want to avoid polling with eth_getTransactionReceipt.
• You are building synchronous request/response flows (payments, bots, simulations).
• You want to simplify transaction submission logic by getting the result in a single call.

For fire-and-forget scenarios or when submitting many transactions in parallel, use eth_sendRawTransaction.

Cross-chain note

Other Chainstack chains expose the same method but with different parameter conventions. Per EIP-7966, the timeout should be a decimal integer; Polygon’s Bor is the exception because the method existed in Bor before the EIP standardized the encoding. See the Ethereum equivalent for the EIP-7966 form.

Body

application/json

jsonrpc · string · default: 2.0 · required

method · string · default: eth_sendRawTransactionSync · required

id · integer · default: 1 · required

params · string[] · required

Required array length: 1 - 2 elements

Response

200 - application/json

Successful transaction submission with receipt

jsonrpc · string

Example:

"2.0"

id · integer

Example:

1

result · object

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