txpool_status

txpool_status returns the count of pending and queued transactions in the node's transaction pool as two hex-encoded integers, pending and queued. It is the lightweight counterpart to txpool_inspect: instead of dumping every transaction, it gives you just the totals. On Arbitrum One (chain ID 42161) — the Optimistic Rollup that settles to Ethereum and meters gas in ETH — these counts reflect what the node currently holds in its pool, where pending transactions are ready for inclusion and queued ones are waiting on a nonce gap or other condition. Call it with no parameters at https://arbitrum.therpc.io/YOUR_API_KEY and convert the hex values to decimal for display.

Use cases

• Monitor mempool depth on Arbitrum One to detect congestion and tune the gas you bid — though note that fees here combine L2 execution cost with the L1 calldata posting cost, so pool depth is only one input.
• Feed a dashboard gauge that shows the current transaction backlog (pending plus queued) as a cheap, frequently polled health signal.

Parameters

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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": "txpool_status",
7    "params": [],
8    "id": 1
9  }'

Try it live in the Arbitrum One playground.

Errors & troubleshooting

Common pitfalls

• The txpool namespace is only exposed by Geth-compatible nodes, so a node that does not implement it returns a "method not found" error rather than a count.
• The numbers are instantaneous snapshots that change rapidly as Arbitrum's sequencer drains and refills the pool. Do not cache them aggressively or treat one reading as a stable value — poll fresh whenever the count matters.

Supported networks

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

See also

• txpool_inspect

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":"txpool_status","params":[]}'