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Event dispatching / observer interface

The stacks-node supports a configurable event observer interface. This is enabled by adding an entry to the node's config.toml file:

...
[[events_observer]]
endpoint = "listener:3700"
events_keys = [
  "*"
]
...

The stacks-node will then execute HTTP POSTs to the configured endpoint in two events:

  1. A new Stacks block is processed.
  2. New mempool transactions have been received.

These events are sent to the configured endpoint at two URLs:

POST /new_block

This payload includes data related to a newly processed block, and any events emitted from Stacks transactions during the block.

If the transaction originally comes from the parent microblock stream preceding this block, the microblock related fields will be filled in.

If the raw_tx field for a particular transaction is "0x00", that indicates that it is a burnchain operation. A burnchain operation is a transaction that is executed on the Stacks network, but was sent through the Bitcoin network. The Stacks network supports a few specific burnchain operations. You can read more about them here. The section below has example json encodings for each of the burnchain operations.

Example:

{
  "block_hash": "0x4eaabcd105865e471f697eff5dd5bd85d47ecb5a26a3379d74fae0ae87c40904",
  "block_height": 3,
  "burn_block_time": 1591301733,
  "events": [
    {
      "event_index": 1,
      "committed": true,
      "stx_transfer_event": {
        "amount": "1000",
        "recipient": "ST31DA6FTSJX2WGTZ69SFY11BH51NZMB0ZZ239N96",
        "sender": "ST3WM51TCWMJYGZS1QFMC28DH5YP86782YGR113C1"
      },
      "txid": "0x738e4d44636023efa08374033428e44eca490582bd39a6e61f3b6cf749b4214c",
      "type": "stx_transfer_event"
    }
  ],
  "index_block_hash": "0x329efcbcc6daf5ac3f264522e0df50eddb5be85df6ee8a9fc2384c54274d7afc",
  "parent_block_hash": "0xf5d4ce0efe1d42c963d615ce57f0d014f263a985175e4ece766eceff10e0a358",
  "parent_index_block_hash": "0x0c8b38d44d6af72703a4767ff4cea683ec965346d9e9a7ded2d773fb4f257c28",
  "parent_microblock": "0xedd15cf1e697c28df934e259f0f82970a7c9edc2d39bef04bdd0d422116235c6",
  "transactions": [
    {
      "contract_abi": null,
      "burnchain_op": null,
      "raw_result": "0x03",
      "raw_tx": "0x808000000004008bc5147525b8f477f0bc4522a88c8339b2494db50000000000000002000000000000000001015814daf929d8700af344987681f44e913890a12e38550abe8e40f149ef5269f40f4008083a0f2e0ddf65dcd05ecfc151c7ff8a5308ad04c77c0e87b5aeadad31010200000000040000000000000000000000000000000000000000000000000000000000000000",
      "status": "success",
      "tx_index": 0,
      "txid": "0x3e04ada5426332bfef446ba0a06d124aace4ade5c11840f541bf88e2e919faf6",
      "microblock_sequence": "None",
      "microblock_hash": "None",
      "microblock_parent_hash": "None"
    },
    {
      "contract_abi": null,
      "burnchain_op": null,
      "raw_result": "0x03",
      "raw_tx": "0x80800000000400f942874ce525e87f21bbe8c121b12fac831d02f4000000000000000000000000000003e800006ae29867aec4b0e4f776bebdcea7f6d9a24eeff370c8c739defadfcbb52659b30736ad4af021e8fb741520a6c65da419fdec01989fdf0032fc1838f427a9a36102010000000000051ac2d519faccba2e435f3272ff042b89435fd160ff00000000000003e800000000000000000000000000000000000000000000000000000000000000000000",
      "status": "success",
      "tx_index": 1,
      "txid": "0x738e4d44636023efa08374033428e44eca490582bd39a6e61f3b6cf749b4214c",
      "microblock_sequence": "3",
      "microblock_hash": "0x9304fcbcc6daf5ac3f264522e0df50eddb5be85df6ee8a9fc2384c54274daaac",
      "microblock_parent_hash": "0x4893ab44636023efa08374033428e44eca490582bd39a6e61f3b6cf749b474bd"
    },
    {
      "burnchain_op": {
        "transfer_stx": {
          "burn_block_height": 10,
          "burn_header_hash": "1410131010105914101010101013704010101010221010101010101010101010",
          "memo": "0x000102030405",
          "recipient": {
            "address": "SP24ZBZ8ZE6F48JE9G3F3HRTG9FK7E2H6K2QZ3Q1K",
            "address_hash_bytes": "0x89f5fd1f719e4449c980de38e3504be6770a2698",
            "address_version": 22
          },
          "sender": {
            "address": "ST2QKZ4FKHAH1NQKYKYAYZPY440FEPK7GZ1R5HBP2",
            "address_hash_bytes": "0xaf3f91f38aa21ade7e9f95efdbc4201eeb4cf0f8",
            "address_version": 26
          },
          "transfered_ustx": 10,
          "burn_txid": "85aa2106186723f3c4f1d8bb58e3a02746ca9be1be9f4be0c6557079e1f660e6",
          "vtxindex": 10
        }
      },
      "contract_abi": null,
      "execution_cost": {
        "read_count": 0,
        "read_length": 0,
        "runtime": 0,
        "write_count": 0,
        "write_length": 0
      },
      "microblock_hash": null,
      "microblock_parent_hash": null,
      "microblock_sequence": null,
      "raw_result": "0x0703",
      "raw_tx": "0x00",
      "status": "success",
      "tx_index": 2,
      "txid": "0x85aa2106186723f3c4f1d8bb58e3a02746ca9be1be9f4be0c6557079e1f660e6"
    }
  ],
   "matured_miner_rewards": [
    {
      "recipient": "ST31DA6FTSJX2WGTZ69SFY11BH51NZMB0ZZ239N96",
      "coinbase_amount": "1000",
      "tx_fees_anchored": "800",
      "tx_fees_streamed_confirmed": "0",
      "from_stacks_block_hash": "0xf5d4ce0efe1d42c963d615ce57f0d014f263a985175e4ece766eceff10e0a358",
      "from_index_block_hash": "0x329efcbcc6daf5ac3f264522e0df50eddb5be85df6ee8a9fc2384c54274d7afc",
    }
   ],
   "anchored_cost": {
    "runtime": 100,
    "read_count": 10,
    "write_count": 5,
    "read_length": 150,
    "write_length": 75
   },
   "confirmed_microblocks_cost": {
    "runtime": 100,
    "read_count": 10,
    "write_count": 5,
    "read_length": 150,
    "write_length": 75
   }
}

Example json values for burnchain operations

  • TransferStx
{
  "transfer_stx": {
    "burn_block_height": 10,
    "burn_header_hash": "1410131010105914101010101013704010101010221010101010101010101010",
    "memo": "0x000102030405",
    "recipient": {
      "address": "SP24ZBZ8ZE6F48JE9G3F3HRTG9FK7E2H6K2QZ3Q1K",
      "address_hash_bytes": "0x89f5fd1f719e4449c980de38e3504be6770a2698",
      "address_version": 22
    },
    "sender": {
      "address": "ST2QKZ4FKHAH1NQKYKYAYZPY440FEPK7GZ1R5HBP2",
      "address_hash_bytes": "0xaf3f91f38aa21ade7e9f95efdbc4201eeb4cf0f8",
      "address_version": 26
    },
    "transfered_ustx": 10,
    "burn_txid": "85aa2106186723f3c4f1d8bb58e3a02746ca9be1be9f4be0c6557079e1f660e6",
    "vtxindex": 10
  }
}
  • StackStx
{
  "stack_stx": {
    "burn_block_height": 10,
    "burn_header_hash": "1010101010101010101010101010101010101010101010101010101010101010",
    "num_cycles": 10,
    "reward_addr": "16Jswqk47s9PUcyCc88MMVwzgvHPvtEpf",
    "sender": {
      "address": "ST2QKZ4FKHAH1NQKYKYAYZPY440FEPK7GZ1R5HBP2",
      "address_hash_bytes": "0xaf3f91f38aa21ade7e9f95efdbc4201eeb4cf0f8",
      "address_version": 26
    },
    "stacked_ustx": 10,
    "burn_txid": "0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a",
    "vtxindex": 10
  }
}
  • DelegateStx
{
  "delegate_stx": {
    "burn_block_height": 10,
    "burn_header_hash": "1010101010101010101010101010101010101010101010101010101010101010",
    "delegate_to": {
      "address": "SP24ZBZ8ZE6F48JE9G3F3HRTG9FK7E2H6K2QZ3Q1K",
      "address_hash_bytes": "0x89f5fd1f719e4449c980de38e3504be6770a2698",
      "address_version": 22
    },
    "delegated_ustx": 10,
    "sender": {
      "address": "ST2QKZ4FKHAH1NQKYKYAYZPY440FEPK7GZ1R5HBP2",
      "address_hash_bytes": "0xaf3f91f38aa21ade7e9f95efdbc4201eeb4cf0f8",
      "address_version": 26
    },
    "reward_addr": [10, "16Jswqk47s9PUcyCc88MMVwzgvHPvtEpf"],
    "burn_txid": "0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a",
    "until_burn_height": null,
    "vtxindex": 10
  }
}

POST /new_burn_block

This payload includes information about burn blocks as their sortitions are processed. In the event of PoX forks, a new_burn_block event may be triggered for a burn block previously processed.

Example:

{
  "burn_block_hash": "0x4eaabcd105865e471f697eff5dd5bd85d47ecb5a26a3379d74fae0ae87c40904",
  "burn_block_height": 331,
  "reward_recipients": [
    {
      "recipient": "1C56LYirKa3PFXFsvhSESgDy2acEHVAEt6",
      "amt": 5000
    }
  ],
  "reward_slot_holders": [
    "1C56LYirKa3PFXFsvhSESgDy2acEHVAEt6",
    "1C56LYirKa3PFXFsvhSESgDy2acEHVAEt6"
  ],
  "burn_amount": 12000
}
  • reward_recipients is an array of all the rewards received during this burn block. It may include recipients who did not have reward slots during the block. This could happen if a miner's commitment was included a block or two later than intended. Such commitments would not be valid, but the reward recipient would still receive the burn amt.
  • reward_slot_holders is an array of the Bitcoin addresses that would validly receive PoX commitments during this block. These addresses may not actually receive rewards during this block if the block is faster than miners have an opportunity to commit.

POST /new_microblocks

This payload includes data related to one or more microblocks that are either emmitted by the node itself, or received through the network.

Example:

{
  "parent_index_block_hash": "0x999b38d44d6af72703a476dde4cea683ec965346d9e9a7ded2d773fb4f257a3b",
  "events": [
    {
      "event_index": 1,
      "committed": true,
      "stx_transfer_event": {
        "amount": "1000",
        "recipient": "ST31DA6FTSJX2WGTZ69SFY11BH51NZMB0ZZ239N96",
        "sender": "ST3WM51TCWMJYGZS1QFMC28DH5YP86782YGR113C1"
      },
      "txid": "0x738e4d44636023efa08374033428e44eca490582bd39a6e61f3b6cf749b4214c",
      "type": "stx_transfer_event"
    }
  ],
  "transactions": [
    {
      "contract_abi": null,
      "burnchain_op": null,
      "raw_result": "0x03",
      "raw_tx": "0x808000000004008bc5147525b8f477f0bc4522a88c8339b2494db50000000000000002000000000000000001015814daf929d8700af344987681f44e913890a12e38550abe8e40f149ef5269f40f4008083a0f2e0ddf65dcd05ecfc151c7ff8a5308ad04c77c0e87b5aeadad31010200000000040000000000000000000000000000000000000000000000000000000000000000",
      "status": "success",
      "tx_index": 0,
      "txid": "0x3e04ada5426332bfef446ba0a06d124aace4ade5c11840f541bf88e2e919faf6",
      "microblock_sequence": "3",
      "microblock_hash": "0x9304fcbcc6daf5ac3f264522e0df50eddb5be85df6ee8a9fc2384c54274daaac",
      "microblock_parent_hash": "0x4893ab44636023efa08374033428e44eca490582bd39a6e61f3b6cf749b474bd"
    },
    {
      "contract_abi": null,
      "burnchain_op": null,
      "raw_result": "0x03",
      "raw_tx": "0x80800000000400f942874ce525e87f21bbe8c121b12fac831d02f4000000000000000000000000000003e800006ae29867aec4b0e4f776bebdcea7f6d9a24eeff370c8c739defadfcbb52659b30736ad4af021e8fb741520a6c65da419fdec01989fdf0032fc1838f427a9a36102010000000000051ac2d519faccba2e435f3272ff042b89435fd160ff00000000000003e800000000000000000000000000000000000000000000000000000000000000000000",
      "status": "success",
      "tx_index": 1,
      "txid": "0x738e4d44636023efa08374033428e44eca490582bd39a6e61f3b6cf749b4214c",
      "microblock_sequence": "4",
      "microblock_hash": "0xfcd4fc34c6daf5ac3f264522e0df50eddb5be85df6ee8a9fc2384c5427459e43",
      "microblock_parent_hash": "0x9304fcbcc6daf5ac3f264522e0df50eddb5be85df6ee8a9fc2384c54274daaac"
    }
  ],
  "burn_block_hash": "0x4eaabcd105865e471f697eff5dd5bd85d47ecb5a26a3379d74fae0ae87c40904",
  "burn_block_height": 331,
  "burn_block_timestamp": 1651301734
}
  • burn_block_{} are the stats related to the burn block that is associated with the stacks block that precedes this microblock stream.
  • Each transaction json object includes information about the microblock the transaction was packaged into.

POST /new_mempool_tx

This payload includes raw transactions newly received in the node's mempool.

Example:

[
  "0x80800000000400f942874ce525e87f21bbe8c121b12fac831d02f4000000000000000000000000000003e800006ae29867aec4b0e4f776bebdcea7f6d9a24eeff370c8c739defadfcbb52659b30736ad4af021e8fb741520a6c65da419fdec01989fdf0032fc1838f427a9a36102010000000000051ac2d519faccba2e435f3272ff042b89435fd160ff00000000000003e800000000000000000000000000000000000000000000000000000000000000000000"
]

POST /drop_mempool_tx

This payload includes raw transactions newly received in the node's mempool.

Example:

{
  "dropped_txids": ["d7b667bb93898b1d3eba4fee86617b06b95772b192f3643256dd0821b476e36f"],
  "reason": "ReplaceByFee"
}

Reason can be one of:

  • ReplaceByFee - replaced by a transaction with the same nonce, but a higher fee
  • ReplaceAcrossFork - replaced by a transaction with the same nonce but in the canonical fork
  • TooExpensive - the transaction is too expensive to include in a block
  • StaleGarbageCollect - transaction was dropped because it became stale

POST /mined_block

This payload includes data related to block mined by this Stacks node. This will never be invoked if the node is configured only as a follower. This is invoked when the miner assembles the block; this block may or may not win the sortition.

This endpoint will only broadcast events to observers that explicitly register for MinedBlocks events, AnyEvent observers will not receive the events by default.

Example:

{
  "block_hash": "0x4eaabcd105865e471f697eff5dd5bd85d47ecb5a26a3379d74fae0ae87c40904",
  "stacks_height": 3,
  "target_burn_height": 745000,
  "block_size": 145000,
  "anchored_cost": {
    "runtime": 100,
    "read_count": 10,
    "write_count": 5,
    "read_length": 150,
    "write_length": 75
  },
  "confirmed_microblocks_cost": {
    "runtime": 100,
    "read_count": 10,
    "write_count": 5,
    "read_length": 150,
    "write_length": 75
  },
  "tx_events": [
    {
      "Success": {
        "txid": "3e04ada5426332bfef446ba0a06d124aace4ade5c11840f541bf88e2e919faf6", 
        "fee": 0, 
        "execution_cost": { 
          "write_length": 0, 
          "write_count": 0, 
          "read_length": 0, 
          "read_count": 0, 
          "runtime": 0
        }, 
        "result": {
          "ResponseData": 
          {
            "committed": true,
            "data": true
          }
        }
    }}, 
    {
      "ProcessingError": {
        "txid": "eef9f46b20fb637bd07ec92ad3ec175a5a4bdf3e8799259fc5b16a272090d4de",
        "error": "Duplicate contract 'ST3BMYNT1DW2QSRZWB6M4S183NK1BXGJ41TEBCCH8.example'"
      }
    }
  ]
}

POST /mined_microblock

This payload includes data related to microblocks mined by this Stacks node. This will never be invoked if the node is configured only as a follower. This is invoked when the miner assembles the microblock; this microblock may or may be incorporated into the canonical chain.

This endpoint will only broadcast events to observers that explicitly register for MinedMicroblocks events, AnyEvent observers will not receive the events by default.

Example:

{
  "block_hash": "0x4eaabcd105865e471f697eff5dd5bd85d47ecb5a26a3379d74fae0ae87c40904",
  "sequence": 3,
  "anchor_block_consensus_hash": "53c166a709a9abd64a92a57f928a8b26aad08992",
  "anchor_block": "43dbf6095c7622db6607d9584c3f65e908ca4eb77d86ee8cc1352aafec5d68b5",
  "tx_events": [
    {
      "Success": {
        "txid": "3e04ada5426332bfef446ba0a06d124aace4ade5c11840f541bf88e2e919faf6", 
        "fee": 0, 
        "execution_cost": { 
          "write_length": 10, 
          "write_count": 10, 
          "read_length": 20, 
          "read_count": 10, 
          "runtime": 1290
        }, 
        "result": {
          "ResponseData": 
          {
            "committed": true,
            "data": true
          }
        }
    }}, 
    {
      "Skipped": {
        "txid": "eef9f46b20fb637bd07ec92ad3ec175a5a4bdf3e8799259fc5b16a272090d4de",
        "reason": "tx.anchor_mode does not support microblocks, anchor_mode=OnChainOnly."
      }
    }
  ]
}

POST /stackerdb_chunks

This payload includes data related to a single mutation to a StackerDB replica that this node subscribes to. The data will only get sent here if the corresponding chunk has already been successfully stored. The data includes the chunk ID, chunk version, smart contract ID, signature, and data.

This endpoint broadcasts events to AnyEvent observers, as well as to StackerDBChunks observers.

Example:

{
   "contract_id": "STVN97YYA10MY5F6KQJHKNYJNM24C4A1AT39WRW.hello-world",
   "modified_slots": [
      {
         "slot_id": 4,
         "slot_version": 1,
         "signature": "0073feb0a3b8794c95042ac23734eb0db226049665a52a4f7402499256c83d43dd4edf6eb2cb039d7f204b4c4076afde96aca143ea285ff40f10ed68cc6e5fcbc2",
         "data": "68656c6c6f20776f726c64"
      }
   ]
}