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txpool
APIs to inspect transaction pools in the node.
The namespace txpool API gives you access to several non-standard RPC methods to inspect the contents of the transaction pool containing all the currently pending transactions as well as the ones queued for future processing.

The content inspection property can be queried to list the exact details of all the transactions currently pending for inclusion in the next block(s), as well as the ones that are being scheduled for future execution only.
The result is an object with two fields pending and queued. Each of these fields is associative arrays, in which each entry maps an origin-address to a batch of scheduled transactions. These batches themselves are maps associating nonces with actual transactions.
Client
Method invocation
Console
txpool.content
RPC
{"method": "txpool_content"}
Parameters
None
Return Value
Type
Description
JSON string
The content of the transaction pool.
Example
Console
> txpool.content
{
pending: {
0x18352126c43E4EC314E41b632A0c1af6b233260b: {
733: {
blockHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
blockNumber: "0x0",
from: "0x18352126c43e4ec314e41b632a0c1af6b233260b",
gas: "0x5208",
gasPrice: "0x0",
input: "0x",
nonce: "0x2dd",
signatures: [...],
to: "0x18352126c43e4ec314e41b632a0c1af6b233260b",
transactionIndex: "0x0",
txHash: "0xeeac2d4f1255e50659cd57a58e74e46d2af7122d91e347ca341d4e2cd7da689b",
type: "TxTypeLegacyTransaction",
value: "0x2"
},
},
0x952c9a710Ce70D58FD5C55d45c4479b82dEA6DAC: {
756: {
blockHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
blockNumber: "0x0",
from: "0x952c9a710ce70d58fd5c55d45c4479b82dea6dac",
gas: "0x5208",
gasPrice: "0x0",
input: "0x",
nonce: "0x2f4",
signatures: [...],
to: "0x6afe934786fe008c79577d85d8e1af1f6f14c73a",
transactionIndex: "0x0",
txHash: "0x0fad399b31b520e4af5bc9f2ea40de71854a7f3c41d5918d5ed120d1b4fc5154",
type: "TxTypeLegacyTransaction",
value: "0x1"
},
757: {
blockHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
blockNumber: "0x0",
from: "0x952c9a710ce70d58fd5c55d45c4479b82dea6dac",
gas: "0x5208",
gasPrice: "0x0",
input: "0x",
nonce: "0x2f5",
signatures: [...],
to: "0x18352126c43e4ec314e41b632a0c1af6b233260b",
transactionIndex: "0x0",
txHash: "0xdfc3053ce6c27fd4610bb2e103837c4435f27bb6bb9dfd56110cbd2bbe5ea7fa",
type: "TxTypeLegacyTransaction",
value: "0x1"
},
},
},
queued: {
0x7dCef85A0356c36a0B43772e1F7C2e80cE029b96: {
786: {
blockHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
blockNumber: "0x0",
from: "0x7dcef85a0356c36a0b43772e1f7c2e80ce029b96",
gas: "0x5208",
gasPrice: "0x0",
input: "0x",
nonce: "0x312",
signatures: [...],
to: "0x7dcef85a0356c36a0b43772e1f7c2e80ce029b96",
transactionIndex: "0x0",
txHash: "0xf90dab02c355b4f09d1b1f224380a278a03fc76d1fc7d866fb2ad2f503525717",
type: "TxTypeLegacyTransaction",
value: "0x0"
},
},
0xd5B94dd456040612d721A8Eae1e4E97a70b92812: {
742: {
blockHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
blockNumber: "0x0",
from: "0xd5b94dd456040612d721a8eae1e4e97a70b92812",
gas: "0x5208",
gasPrice: "0x0",
input: "0x",
nonce: "0x2e6",
signatures: [...],
to: "0xd5b94dd456040612d721a8eae1e4e97a70b92812",
transactionIndex: "0x0",
txHash: "0x6266969f1221b258bb2ce6fd2bcce88ad76be1e2b3eb5c770311a2bc0c2cc74a",
type: "TxTypeLegacyTransaction",
value: "0x2"
},
}
}
}
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"txpool_content","id":1}' https://api.baobab.klaytn.net:8651
{"jsonrpc":"2.0","id":1,"result":{"pending":{},"queued":{}}}
#There is no pending transaction nor queued transaction.

The inspect inspection property can be queried to list a textual summary of all the transactions currently pending for inclusion in the next block(s), as well as the ones that are being scheduled for future execution only. This is a method specifically tailored to developers to quickly see the transactions in the pool and find any potential issues.
The result is an object with two fields pending and queued. Each of these fields is associative arrays, in which each entry maps an origin-address to a batch of scheduled transactions. These batches themselves are maps associating nonces with transactions summary strings.
Client
Method invocation
Console
txpool.inspect
RPC
{"method": "txpool_inspect"}
Parameters
None
Return Value
Type
Description
JSON string
A list of pending and queued transactions.
Example
Console
> txpool.inspect
{
pending: {
0x26588a9301b0428d95e6fc3a5024fce8bec12d51: {
31813: "0x3375ee30428b2a71c428afa5e89e427905f95f7e: 0 peb + 500000 gas × 25000000000 peb"
},
0x2a65aca4d5fc5b5c859090a6c34d164135398226: {
563662: "0x958c1fa64b34db746925c6f8a3dd81128e40355e: 1051546810000000000 peb + 90000 gas × 25000000000 peb",
563663: "0x77517b1491a0299a44d668473411676f94e97e34: 1051190740000000000 peb + 90000 gas × 25000000000 peb",
563664: "0x3e2a7fe169c8f8eee251bb00d9fb6d304ce07d3a: 1050828950000000000 peb + 90000 gas × 25000000000 peb",
563665: "0xaf6c4695da477f8c663ea2d8b768ad82cb6a8522: 1050544770000000000 peb + 90000 gas × 25000000000 peb",
563666: "0x139b148094c50f4d20b01caf21b85edb711574db: 1048598530000000000 peb + 90000 gas × 25000000000 peb",
563667: "0x48b3bd66770b0d1eecefce090dafee36257538ae: 1048367260000000000 peb + 90000 gas × 25000000000 peb"
},
0x9174e688d7de157c5c0583df424eaab2676ac162: {
3: "0xbb9bc244d798123fde783fcc1c72d3bb8c189413: 30000000000000000000 peb + 85000 gas × 25000000000 peb"
},
0xb18f9d01323e150096650ab989cfecd39d757aec: {
777: "0xcd79c72690750f079ae6ab6ccd7e7aedc03c7720: 0 peb + 1000000 gas × 25000000000 peb"
},
0xb2916c870cf66967b6510b76c07e9d13a5d23514: {
2: "0x576f25199d60982a8f31a8dff4da8acb982e6aba: 26000000000000000000 peb + 90000 gas × 25000000000 peb"
},
0xbc0ca4f217e052753614d6b019948824d0d8688b: {
0: "0x2910543af39aba0cd09dbb2d50200b3e800a63d2: 1000000000000000000 peb + 50000 gas × 25000000000 peb"
},
0xea674fdde714fd979de3edf0f56aa9716b898ec8: {
70148: "0xe39c55ead9f997f7fa20ebe40fb4649943d7db66: 1000767667434026200 peb + 90000 gas × 25000000000 peb"
}
},
queued: {
0x0f6000de1578619320aba5e392706b131fb1de6f: {
6: "0x8383534d0bcd0186d326c993031311c0ac0d9b2d: 9000000000000000000 peb + 21000 gas × 25000000000 peb"
},
0x5b30608c678e1ac464a8994c3b33e5cdf3497112: {
6: "0x9773547e27f8303c87089dc42d9288aa2b9d8f06: 50000000000000000000 peb + 90000 gas × 25000000000 peb"
},
0x976a3fc5d6f7d259ebfb4cc2ae75115475e9867c: {
3: "0x346fb27de7e7370008f5da379f74dd49f5f2f80f: 140000000000000000 peb + 90000 gas × 25000000000 peb"
},
0x9b11bf0459b0c4b2f87f8cebca4cfc26f294b63a: {
2: "0x24a461f25ee6a318bdef7f33de634a67bb67ac9d: 17000000000000000000 peb + 90000 gas × 25000000000 peb",
6: "0x6368f3f8c2b42435d6c136757382e4a59436a681: 17990000000000000000 peb + 90000 gas × 25000000000 peb",
7: "0x6368f3f8c2b42435d6c136757382e4a59436a681: 17900000000000000000 peb + 90000 gas × 25000000000 peb"
}
}
}
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"txpool_inspect","id":1}' https://api.baobab.klaytn.net:8651
{"jsonrpc":"2.0","id":1,"result":{"pending":{"0x1A789E38cD567a00b7Fb8e1D39100ac395fa463B":{"0":"0x87AC99835e67168d4f9a40580f8F5C33550bA88b: 0 peb + 99000000 gas × 25000000000 peb"},"0xAb552FC3d76de919c74435A4C6B04576a9763934":{"0":"0x87AC99835e67168d4f9a40580f8F5C33550bA88b: 0 peb + 99000000 gas × 25000000000 peb"}},"queued":{}}}

The status inspection property can be queried for the number of transactions currently pending for inclusion in the next block(s), as well as the ones that are being scheduled for future execution only.
The result is an object with two fields pending and queued, each of which is a counter representing the number of transactions in that particular state.
Client
Method invocation
Console
txpool.status
RPC
{"method": "txpool_status"}
Parameters
None
Return Value
Name
Type
Description
pending
int
The number of pending transactions.
queued
int
The number of queued transactions.
Example
Console
> txpool.status
{
pending: 10,
queued: 7
}
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"txpool_status","id":1}' https://api.baobab.klaytn.net:8651
{"jsonrpc":"2.0","id":1,"result":{"pending":"0x0","queued":"0x0"}}
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txpool_content
txpool_inspect
txpool_status