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The 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.

txpool_content

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 are 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.

Please note, there may be multiple transactions associated with the same account and nonce. This can happen if the user broadcast mutliple ones with varying gas allowances (or even complerely different transactions).

Example

> txpool.content
{
  pending: {
    0x0216d5032f356960cd3749c31ab34eeff21b3395: {
      806: {
        blockHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
        blockNumber: null,
        from: "0x0216d5032f356960cd3749c31ab34eeff21b3395",
        gas: "0x5208",
        gasPrice: "0xba43b7400",
        hash: "0xaf953a2d01f55cfe080c0c94150a60105e8ac3d51153058a1f03dd239dd08586",
        input: "0x",
        nonce: "0x326",
        to: "0x7f69a91a3cf4be60020fb58b893b7cbb65376db8",
        transactionIndex: null,
        value: "0x19a99f0cf456000"
      }
    },
    0x24d407e5a0b506e1cb2fae163100b5de01f5193c: {
      34: {
        blockHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
        blockNumber: null,
        from: "0x24d407e5a0b506e1cb2fae163100b5de01f5193c",
        gas: "0x44c72",
        gasPrice: "0x4a817c800",
        hash: "0xb5b8b853af32226755a65ba0602f7ed0e8be2211516153b75e9ed640a7d359fe",
        input: "0xb61d27f600000000000000000000000024d407e5a0b506e1cb2fae163100b5de01f5193c00000000000000000000000000000000000000000000000053444835ec580000000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
        nonce: "0x22",
        to: "0x7320785200f74861b69c49e4ab32399a71b34f1a",
        transactionIndex: null,
        value: "0x0"
      }
    }
  },
  queued: {
    0x976a3fc5d6f7d259ebfb4cc2ae75115475e9867c: {
      3: {
        blockHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
        blockNumber: null,
        from: "0x976a3fc5d6f7d259ebfb4cc2ae75115475e9867c",
        gas: "0x15f90",
        gasPrice: "0x4a817c800",
        hash: "0x57b30c59fc39a50e1cba90e3099286dfa5aaf60294a629240b5bbec6e2e66576",
        input: "0x",
        nonce: "0x3",
        to: "0x346fb27de7e7370008f5da379f74dd49f5f2f80f",
        transactionIndex: null,
        value: "0x1f161421c8e0000"
      }
    },
    0x9b11bf0459b0c4b2f87f8cebca4cfc26f294b63a: {
      2: {
        blockHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
        blockNumber: null,
        from: "0x9b11bf0459b0c4b2f87f8cebca4cfc26f294b63a",
        gas: "0x15f90",
        gasPrice: "0xba43b7400",
        hash: "0x3a3c0698552eec2455ed3190eac3996feccc806970a4a056106deaf6ceb1e5e3",
        input: "0x",
        nonce: "0x2",
        to: "0x24a461f25ee6a318bdef7f33de634a67bb67ac9d",
        transactionIndex: null,
        value: "0xebec21ee1da40000"
      },
      6: {
        blockHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
        blockNumber: null,
        from: "0x9b11bf0459b0c4b2f87f8cebca4cfc26f294b63a",
        gas: "0x15f90",
        gasPrice: "0x4a817c800",
        hash: "0xbbcd1e45eae3b859203a04be7d6e1d7b03b222ec1d66dfcc8011dd39794b147e",
        input: "0x",
        nonce: "0x6",
        to: "0x6368f3f8c2b42435d6c136757382e4a59436a681",
        transactionIndex: null,
        value: "0xf9a951af55470000"
      }
    }
  }
}

txpool_inspect

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 are 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.

Please note, there may be multiple transactions associated with the same account and nonce. This can happen if the user broadcast mutliple ones with varying gas allowances (or even complerely different transactions).

Example

> txpool.inspect
{
  pending: {
    0x26588a9301b0428d95e6fc3a5024fce8bec12d51: {
      31813: "0x3375ee30428b2a71c428afa5e89e427905f95f7e: 0 wei + 500000 × 20000000000 wei"
    },
    0x2a65aca4d5fc5b5c859090a6c34d164135398226: {
      563662: "0x958c1fa64b34db746925c6f8a3dd81128e40355e: 1051546810000000000 wei + 90000 gas × 20000000000 wei",
      563663: "0x77517b1491a0299a44d668473411676f94e97e34: 1051190740000000000 wei + 90000 gas × 20000000000 wei",
      563664: "0x3e2a7fe169c8f8eee251bb00d9fb6d304ce07d3a: 1050828950000000000 wei + 90000 gas × 20000000000 wei",
      563665: "0xaf6c4695da477f8c663ea2d8b768ad82cb6a8522: 1050544770000000000 wei + 90000 gas × 20000000000 wei",
      563666: "0x139b148094c50f4d20b01caf21b85edb711574db: 1048598530000000000 wei + 90000 gas × 20000000000 wei",
      563667: "0x48b3bd66770b0d1eecefce090dafee36257538ae: 1048367260000000000 wei + 90000 gas × 20000000000 wei",
      563668: "0x468569500925d53e06dd0993014ad166fd7dd381: 1048126690000000000 wei + 90000 gas × 20000000000 wei",
      563669: "0x3dcb4c90477a4b8ff7190b79b524773cbe3be661: 1047965690000000000 wei + 90000 gas × 20000000000 wei",
      563670: "0x6dfef5bc94b031407ffe71ae8076ca0fbf190963: 1047859050000000000 wei + 90000 gas × 20000000000 wei"
    },
    0x9174e688d7de157c5c0583df424eaab2676ac162: {
      3: "0xbb9bc244d798123fde783fcc1c72d3bb8c189413: 30000000000000000000 wei + 85000 gas × 21000000000 wei"
    },
    0xb18f9d01323e150096650ab989cfecd39d757aec: {
      777: "0xcd79c72690750f079ae6ab6ccd7e7aedc03c7720: 0 wei + 1000000 gas × 20000000000 wei"
    },
    0xb2916c870cf66967b6510b76c07e9d13a5d23514: {
      2: "0x576f25199d60982a8f31a8dff4da8acb982e6aba: 26000000000000000000 wei + 90000 gas × 20000000000 wei"
    },
    0xbc0ca4f217e052753614d6b019948824d0d8688b: {
      0: "0x2910543af39aba0cd09dbb2d50200b3e800a63d2: 1000000000000000000 wei + 50000 gas × 1171602790622 wei"
    },
    0xea674fdde714fd979de3edf0f56aa9716b898ec8: {
      70148: "0xe39c55ead9f997f7fa20ebe40fb4649943d7db66: 1000767667434026200 wei + 90000 gas × 20000000000 wei"
    }
  },
  queued: {
    0x0f6000de1578619320aba5e392706b131fb1de6f: {
      6: "0x8383534d0bcd0186d326c993031311c0ac0d9b2d: 9000000000000000000 wei + 21000 gas × 20000000000 wei"
    },
    0x5b30608c678e1ac464a8994c3b33e5cdf3497112: {
      6: "0x9773547e27f8303c87089dc42d9288aa2b9d8f06: 50000000000000000000 wei + 90000 gas × 50000000000 wei"
    },
    0x976a3fc5d6f7d259ebfb4cc2ae75115475e9867c: {
      3: "0x346fb27de7e7370008f5da379f74dd49f5f2f80f: 140000000000000000 wei + 90000 gas × 20000000000 wei"
    },
    0x9b11bf0459b0c4b2f87f8cebca4cfc26f294b63a: {
      2: "0x24a461f25ee6a318bdef7f33de634a67bb67ac9d: 17000000000000000000 wei + 90000 gas × 50000000000 wei",
      6: "0x6368f3f8c2b42435d6c136757382e4a59436a681: 17990000000000000000 wei + 90000 gas × 20000000000 wei",
      7: "0x6368f3f8c2b42435d6c136757382e4a59436a681: 17900000000000000000 wei + 90000 gas × 20000000000 wei"
    }
  }
}

txpool_status

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.

Example

> txpool.status
{
  pending: 10,
  queued: 7
}