eth_getTransactionCount

Returns the number of transactions sent from an address (the nonce). Use pending on a Flashblocks endpoint to get the pre-confirmed nonce.

Returns the number of transactions sent from an address. This value is the account’s current nonce — the value to use as nonce when constructing the next transaction.

Flashblocks: Query https://mainnet-preconf.base.org with "pending" to get the nonce inclusive of all pre-confirmed transactions, updated every ~200ms. This is critical for agents submitting high-frequency transactions to avoid nonce gaps.

Parameters

address · string · required

The 20-byte address to query.

block · string · required

Block number in hex, or "latest", "pending", "safe", "finalized", "earliest". Use "pending" on a Flashblocks endpoint to include all pre-confirmed transactions in the nonce count.

Returns

result · string

The transaction count (nonce) as a hexadecimal string.

Example

Standard (latest confirmed)

curl https://mainnet.base.org \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getTransactionCount",
    "params": ["0x742d35Cc6634C0532925a3b8D4C9dD0b4f3BaEa", "latest"],
    "id": 1
  }'