txpool_inspect

txpool_inspect returns a human-readable text summary of every pending and queued transaction held in the node's transaction pool, organised by sender address and then by nonce. Each entry condenses to a one-line string like "<to>: <value> wei + <gas> gas × <gasPrice> wei", so you can scan the pool at a glance instead of parsing full transaction objects. On Arbitrum One (chain ID 42161) — the Optimistic Rollup that settles to Ethereum and prices gas in ETH — transactions flow through the sequencer rather than a public mempool, so what a node exposes here depends on its configuration. Call it with no parameters against https://arbitrum.therpc.io/YOUR_API_KEY.

Use cases

• Debug a stuck transaction by locating it under its sender address and nonce in the readable summary, to see the gas price and value it was submitted with on Arbitrum One.
• Audit the transaction pool's contents during high-congestion incidents — for example a surge of swaps across Camelot or GMX — to understand what is backed up before it clears.

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_inspect",
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 and is not part of every Arbitrum One client build; a node that omits it answers with a "method not found" error.
• The text format is built for humans, not machines. Do not parse these strings programmatically — use txpool_content when you need full transaction objects you can read field by field.
• During heavy mempool activity the response can grow very large. When you only need totals, call the lightweight txpool_status for pending/queued counts instead of pulling the whole inspection dump.

Supported networks

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

See also

• txpool_status

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_inspect","params":[]}'