eth_getTransactionCount

eth_getTransactionCount returns the nonce of an account on Arbitrum One — the count of transactions that address has sent, which is also the value you must set on the next transaction. Arbitrum One (chain ID 42161) is an Optimistic Rollup paying gas in ETH, and the sequencer's sub-second soft confirmations mean a pending nonce updates quickly. Call it at https://arbitrum.therpc.io/YOUR_API_KEY with an address and a block tag and it returns the number of transactions sent from that address (the account nonce) at the specified block, hex-encoded.

Use cases

• Get the next nonce when building and signing a new Arbitrum One transaction.
• Detect a stuck transaction by comparing the latest nonce against the pending nonce — a gap means something is queued but unconfirmed.
• Pre-calculate nonces to fire several transactions back-to-back without waiting for each to confirm.
• Study an account's activity over time by querying its nonce at historical block heights.

Parameters

Response

Example request

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

Try it live in the Arbitrum One playground.

Errors & troubleshooting

Common pitfalls

• When firing several transactions back-to-back, query with the pending tag; latest returns the same nonce for all of them until the sequencer confirms one, causing collisions.
• Leaving a nonce gap — submitting N+1 before N is included — makes the later transactions sit in the queue indefinitely until the missing nonce arrives.
• For a contract account the nonce only increments on each CREATE/CREATE2, not on ordinary calls, so it is not a count of inbound interactions.

Supported networks

• Mainnet — Chain ID: 42161
• Sepolia — Chain ID: 421614

See also

• eth_sendRawTransaction
• eth_getTransactionByHash
• eth_getBalance

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