API

Introduction

The Stacks Blockchain API allows you to query the Stacks blockchain and interact with smart contracts. It was built to maintain pageable materialized views of the Stacks Blockchain.

Note that the Stacks Node RPC API and the Hiro Stacks API are two different things. The Hiro API is a centralized service run by Hiro, a developer tooling company, that makes it easy to get onboarded and begin interacting with the Stacks blockchain in a RESTful way. You can also run your own API server.

The Hiro Stacks API is a proxy for the Stacks Node API that makes it a bit easier to work with by providing additional functionality.

The RPC API is generated by every Stacks node and allows developers to self-host their own node and API for a more decentralized architecture.

The RPC API can be used without any authorization. The basepath for the API is:

# for mainnet, replace `testnet` with `mainnet`
https://api.testnet.hiro.so/

If you run a local node, it exposes an HTTP server on port 20443. The info endpoint would be localhost:20443/v2/info.

Stacks Node RPC API endpoints

The Stacks 2.0 Blockchain API (Hiro's API) is centrally hosted. However, every running Stacks node exposes an RPC API, which allows you to interact with the underlying blockchain. Instead of using a centrally hosted API, you can directly access the RPC API of a locally hosted Node.

Broadcast raw transaction

post

Broadcast raw transactions on the network. You can use the @stacks/transactions project to generate a raw transaction payload.

Body

string · binaryOptional

Responses

200

Transaction ID of successful post of a raw tx to the node's mempool

text/plain

ResponsestringExample: "e161978626f216b2141b156ade10501207ae535fa365a13ef5d7a7c9310a09f2"

400

Rejections result in a 400 error

application/json

post

HTTPcURLJavaScriptPython

POST /v2/transactions HTTP/1.1
Host: localhost:20443
Content-Type: application/octet-stream
Accept: */*
Content-Length: 379

"binary format of 00000000010400bed38c2aadffa348931bcb542880ff79d607afec000000000000000000000000000000c800012b0b1fff6cccd0974966dcd665835838f0985be508e1322e09fb3d751eca132c492bda720f9ef1768d14fdabed6127560ba52d5e3ac470dcb60b784e97dc88c9030200000000000516df0ba3e79792be7be5e50a370289accfc8c9e032000000000000303974657374206d656d6f00000000000000000000000000000000000000000000000000"

"e161978626f216b2141b156ade10501207ae535fa365a13ef5d7a7c9310a09f2"

Get contract interface

get

Get contract interface using a contract_address and contract name

Path parameters

contract_addressstringRequired

Stacks address

contract_namestringRequired

Contract name

Query parameters

tipstringOptional

The Stacks chain tip to query from. If tip == latest, the query will be run from the latest known tip (includes unconfirmed state).

Responses

200

Contract interface

application/json

get

HTTPcURLJavaScriptPython

GET /v2/contracts/interface/{contract_address}/{contract_name} HTTP/1.1
Host: localhost:20443
Accept: */*

200

Contract interface

{
  "functions": [
    {
      "name": "get-value",
      "access": "public",
      "args": [
        {
          "name": "key",
          "type": {
            "buffer": {
              "length": 32
            }
          }
        }
      ],
      "outputs": {
        "type": {
          "response": {
            "ok": {
              "buffer": {
                "length": 32
              }
            },
            "error": "int128"
          }
        }
      }
    },
    {
      "name": "set-value",
      "access": "public",
      "args": [
        {
          "name": "key",
          "type": {
            "buffer": {
              "length": 32
            }
          }
        },
        {
          "name": "value",
          "type": {
            "buffer": {
              "length": 32
            }
          }
        }
      ],
      "outputs": {
        "type": {
          "response": {
            "ok": "uint128",
            "error": "none"
          }
        }
      }
    },
    {
      "name": "test-emit-event",
      "access": "public",
      "args": [],
      "outputs": {
        "type": {
          "response": {
            "ok": "uint128",
            "error": "none"
          }
        }
      }
    },
    {
      "name": "test-event-types",
      "access": "public",
      "args": [],
      "outputs": {
        "type": {
          "response": {
            "ok": "uint128",
            "error": "none"
          }
        }
      }
    }
  ],
  "variables": [
    {
      "name": "recipient",
      "type": "principal",
      "access": "constant"
    },
    {
      "name": "sender",
      "type": "principal",
      "access": "constant"
    }
  ],
  "maps": [
    {
      "name": "store",
      "key": [
        {
          "name": "key",
          "type": {
            "buffer": {
              "length": 32
            }
          }
        }
      ],
      "value": [
        {
          "name": "value",
          "type": {
            "buffer": {
              "length": 32
            }
          }
        }
      ]
    }
  ],
  "fungible_tokens": [
    {
      "name": "novel-token-19"
    }
  ],
  "non_fungible_tokens": [
    {
      "name": "hello-nft",
      "type": "uint128"
    }
  ]
}

Get specific data-map inside a contract

post

Attempt to fetch data from a contract data map. The contract is identified with [Stacks Address] and [Contract Name] in the URL path. The map is identified with [Map Name].

The key to lookup in the map is supplied via the POST body. This should be supplied as the hex string serialization of the key (which should be a Clarity value). Note, this is a JSON string atom.

In the response, data is the hex serialization of the map response. Note that map responses are Clarity option types, for non-existent values, this is a serialized none, and for all other responses, it is a serialized (some ...) object.

Path parameters

contract_addressstringRequired

Stacks address

contract_namestringRequired

Contract name

map_namestringRequired

Map name

Query parameters

proofintegerOptional

Returns object without the proof field when set to 0

tipstringOptional

The Stacks chain tip to query from. If tip == latest, the query will be run from the latest known tip (includes unconfirmed state).

Body

stringOptional

Responses

200

Success

application/json

400

Failed loading data map

post

HTTPcURLJavaScriptPython

POST /v2/map_entry/{contract_address}/{contract_name}/{map_name} HTTP/1.1
Host: localhost:20443
Content-Type: application/json
Accept: */*
Content-Length: 6

"text"

{
  "data": "0x0a0c000000010a6d6f6e737465722d69640100000000000000000000000000000001",
  "proof": "0x123..."
}

Get contract source

get

Returns the Clarity source code of a given contract, along with the block height it was published in, and the MARF proof for the data

Path parameters

contract_addressstringRequired

Stacks address

contract_namestringRequired

Contract name

Query parameters

proofintegerOptional

Returns object without the proof field if set to 0

tipstringOptional

The Stacks chain tip to query from. If tip == latest, the query will be run from the latest known tip (includes unconfirmed state).

Responses

200

Success

application/json

get

HTTPcURLJavaScriptPython

GET /v2/contracts/source/{contract_address}/{contract_name} HTTP/1.1
Host: localhost:20443
Accept: */*

200

Success

{
  "source": "(define-constant sender 'SZ2J6ZY48GV1EZ5V2V5RB9MP66SW86PYKKQ9H6DPR)\n(define-constant recipient 'SM2J6ZY48GV1EZ5V2V5RB9MP66SW86PYKKQVX8X0G)\n\n(define-fungible-token novel-token-19)\n(begin (ft-mint? novel-token-19 u12 sender))\n(begin (ft-transfer? novel-token-19 u2 sender recipient))\n\n(define-non-fungible-token hello-nft uint)\n(begin (nft-mint? hello-nft u1 sender))\n(begin (nft-mint? hello-nft u2 sender))\n(begin (nft-transfer? hello-nft u1 sender recipient))\n\n(define-public (test-emit-event)\n    (begin\n        (print \"Event! Hello world\")\n        (ok u1)))\n(begin (test-emit-event))\n\n(define-public (test-event-types)\n    (begin\n        (unwrap-panic (ft-mint? novel-token-19 u3 recipient))\n        (unwrap-panic (nft-mint? hello-nft u2 recipient))\n        (unwrap-panic (stx-transfer? u60 tx-sender 'SZ2J6ZY48GV1EZ5V2V5RB9MP66SW86PYKKQ9H6DPR))\n        (unwrap-panic (stx-burn? u20 tx-sender))\n        (ok u1)))\n\n(define-map store ((key (buff 32))) ((value (buff 32))))\n(define-public (get-value (key (buff 32)))\n    (begin\n        (match (map-get? store ((key key)))\n            entry (ok (get value entry))\n            (err 0))))\n(define-public (set-value (key (buff 32)) (value (buff 32)))\n    (begin\n        (map-set store ((key key)) ((value value)))\n        (ok u1)))",
  "publish_height": 3196,
  "proof": "0000001104060000001ec4e..."
}

Call read-only function

post

Call a read-only public function on a given smart contract.

The smart contract and function are specified using the URL path. The arguments and the simulated tx-sender are supplied via the POST body in the following JSON format:

Path parameters

contract_addressstringRequired

Stacks address

contract_namestringRequired

Contract name

function_namestringRequired

Function name

Query parameters

tipstringOptional

The Stacks chain tip to query from. If tip == latest, the query will be run from the latest known tip (includes unconfirmed state).

Body

Describes representation of a Type-0 Stacks 2.0 transaction. https://github.com/stacksgov/sips/blob/main/sips/sip-005/sip-005-blocks-and-transactions.md#type-0-transferring-an-asset

senderstringRequired

The simulated tx-sender

argumentsstring[]Required

An array of hex serialized Clarity values

Responses

200

Success

application/json

post

HTTPcURLJavaScriptPython

POST /v2/contracts/call-read/{contract_address}/{contract_name}/{function_name} HTTP/1.1
Host: localhost:20443
Content-Type: application/json
Accept: */*
Content-Length: 102

{
  "sender": "SP31DA6FTSJX2WGTZ69SFY11BH51NZMB0ZW97B5P0.get-info",
  "arguments": [
    "0x0011...",
    "0x00231..."
  ]
}

200

Success

{
  "okay": true,
  "result": "0x111..."
}

Get account info

get

Get the account data for the provided principal

Where balance is the hex encoding of a unsigned 128-bit integer (big-endian), nonce is a unsigned 64-bit integer, and the proofs are provided as hex strings.

For non-existent accounts, this does not 404, rather it returns an object with balance and nonce of 0.

Path parameters

principalstringRequired

Stacks address or a Contract identifier (e.g. SP31DA6FTSJX2WGTZ69SFY11BH51NZMB0ZW97B5P0.get-info)

Query parameters

proofintegerOptional

Returns object without the proof field if set to 0

tipstringOptional

The Stacks chain tip to query from. If tip == latest, the query will be run from the latest known tip (includes unconfirmed state).

Responses

200

Success

application/json

get

HTTPcURLJavaScriptPython

GET /v2/accounts/{principal} HTTP/1.1
Host: localhost:20443
Accept: */*

200

Success

{
  "balance": "0x0000000000000000000000000007a120",
  "locked": "0x0000000000000000000000000007a120",
  "unlock_height": 126,
  "nonce": 2867,
  "balance_proof": "0xabce",
  "nonce_proof": "0xabcd"
}

Get approximate fees for the given transaction

post

Get an estimated fee for the supplied transaction. This estimates the execution cost of the transaction, the current fee rate of the network, and returns estimates for fee amounts.

• transaction_payload is a hex-encoded serialization of the TransactionPayload for the transaction.
• estimated_len is an optional argument that provides the endpoint with an estimation of the final length (in bytes) of the transaction, including any post-conditions and signatures

If the node cannot provide an estimate for the transaction (e.g., if the node has never seen a contract-call for the given contract and function) or if estimation is not configured on this node, a 400 response is returned. The 400 response will be a JSON error containing a reason field which can be one of the following:

• DatabaseError - this Stacks node has had an internal database error while trying to estimate the costs of the supplied transaction.
• NoEstimateAvailable - this Stacks node has not seen this kind of contract-call before, and it cannot provide an estimate yet.
• CostEstimationDisabled - this Stacks node does not perform fee or cost estimation, and it cannot respond on this endpoint.

The 200 response contains the following data:

• estimated_cost - the estimated multi-dimensional cost of executing the Clarity VM on the provided transaction.
• estimated_cost_scalar - a unitless integer that the Stacks node uses to compare how much of the block limit is consumed by different transactions. This value incorporates the estimated length of the transaction and the estimated execution cost of the transaction. The range of this integer may vary between different Stacks nodes. In order to compute an estimate of total fee amount for the transaction, this value is multiplied by the same Stacks node's estimated fee rate.
• cost_scalar_change_by_byte - a float value that indicates how much the estimated_cost_scalar value would increase for every additional byte in the final transaction.
• estimations - an array of estimated fee rates and total fees to pay in microSTX for the transaction. This array provides a range of estimates (default: 3) that may be used. Each element of the array contains the following fields:
  • fee_rate - the estimated value for the current fee rates in the network
  • fee - the estimated value for the total fee in microSTX that the given transaction should pay. These values are the result of computing: fee_rate x estimated_cost_scalar. If the estimated fees are less than the minimum relay fee (1 ustx x estimated_len), then that minimum relay fee will be returned here instead.

Note: If the final transaction's byte size is larger than supplied to estimated_len, then applications should increase this fee amount by:

fee_rate x cost_scalar_change_by_byte x (final_size - estimated_size)

Body

POST request for estimated fee

transaction_payloadstringRequired

estimated_lenintegerOptional

Responses

200

Estimated fees for the transaction

application/json

post

HTTPcURLJavaScriptPython

POST /v2/fees/transaction HTTP/1.1
Host: localhost:20443
Content-Type: application/json
Accept: */*
Content-Length: 140

{
  "estimated_len": 350,
  "transaction_payload": "021af942874ce525e87f21bbe8c121b12fac831d02f4086765742d696e666f0b7570646174652d696e666f00000000"
}

200

Estimated fees for the transaction

{
  "$ref": "./api/core-node/post-fee-transaction-response.example.json"
}

Get estimated fee

get

Get an estimated fee rate for STX transfer transactions. This a a fee rate / byte, and is returned as a JSON integer

Responses

200

Success

application/json

Responseany

get

HTTPcURLJavaScriptPython

GET /v2/fees/transfer HTTP/1.1
Host: localhost:20443
Accept: */*

200

Success

{
  "$ref": "./api/core-node/get-fee-transfer.example.json"
}

Get Core API info

get

Get Core API information

Responses

200

Success

application/json

get

HTTPcURLJavaScriptPython

GET /v2/info HTTP/1.1
Host: localhost:20443
Accept: */*

200

Success

{
  "peer_version": 385875968,
  "pox_consensus": "17f76e597bab45646956f38dd39573085d72cbc0",
  "burn_block_height": 16,
  "stable_pox_consensus": "8e0561978fc5506b68a589c402dad97e862edb59",
  "stable_burn_block_height": 15,
  "server_version": "blockstack-core 0.0.1 => 23.0.0.0 (, release build, linux [x86_64])",
  "network_id": 2147483648,
  "parent_network_id": 3669344250,
  "stacks_tip_height": 15,
  "stacks_tip": "b1807a2d3f7f8c7922f7c1d60d7c34145ade05d789640dc7dc9ec1021e07bb54",
  "stacks_tip_consensus_hash": "17f76e597bab45646956f38dd39573085d72cbc0",
  "unanchored_tip": "0000000000000000000000000000000000000000000000000000000000000000",
  "tenure_height": 523,
  "exit_at_block_height": null,
  "is_fully_synced": false
}

Get PoX details

get

Get Proof of Transfer (PoX) information. Can be used for Stacking.

Query parameters

tipstringOptional

The Stacks chain tip to query from. If tip == latest, the query will be run from the latest known tip (includes unconfirmed state).

Responses

200

Success

application/json

get

HTTPcURLJavaScriptPython

GET /v2/pox HTTP/1.1
Host: localhost:20443
Accept: */*

200

Success

{
  "contract_id": "SP000000000000000000002Q6VF78.pox",
  "pox_activation_threshold_ustx": 52329761604388,
  "first_burnchain_block_height": 666050,
  "current_burnchain_block_height": 812345,
  "prepare_phase_block_length": 100,
  "reward_phase_block_length": 2000,
  "reward_slots": 4000,
  "rejection_fraction": 25,
  "total_liquid_supply_ustx": 1046595232087772,
  "current_cycle": {
    "id": 2,
    "min_threshold_ustx": 70000000000,
    "stacked_ustx": 202157971547640,
    "is_pox_active": true
  },
  "next_cycle": {
    "id": 3,
    "min_threshold_ustx": 70000000000,
    "min_increment_ustx": 52329761604,
    "stacked_ustx": 162057034977640,
    "prepare_phase_start_block_height": 672250,
    "blocks_until_prepare_phase": 407,
    "reward_phase_start_block_height": 672350,
    "blocks_until_reward_phase": 507,
    "ustx_until_pox_rejection": 261648808021925
  },
  "min_amount_ustx": 70000000000,
  "prepare_cycle_length": 100,
  "reward_cycle_id": 2,
  "reward_cycle_length": 2100,
  "rejection_votes_left_required": 261648808021925,
  "next_reward_cycle_in": 507,
  "contract_versions": [
    {
      "contract_id": "SP000000000000000000002Q6VF78.pox",
      "activation_burnchain_block_height": 666050,
      "first_reward_cycle_id": 0
    },
    {
      "contract_id": "SP000000000000000000002Q6VF78.pox-2",
      "activation_burnchain_block_height": 712345,
      "first_reward_cycle_id": 123
    }
  ]
}

Get trait implementation details

get

Determine whether or not a specified trait is implemented (either explicitly or implicitly) within a given contract.

Path parameters

contract_addressstringRequired

Stacks address

contract_namestringRequired

Contract name

trait_contract_addressstringRequired

Trait Stacks address

trait_contract_namestringRequired

Trait contract name

trait_namestringRequired

Trait name

Query parameters

tipstringOptional

The Stacks chain tip to query from. If tip == "latest", the query will be run from the latest known tip (includes unconfirmed state). If the tip is left unspecified, the stacks chain tip will be selected (only includes confirmed state).

Responses

200

Success

application/json

get

HTTPcURLJavaScriptPython

GET /v2/traits/{contract_address}/{contract_name}/{trait_contract_address}/{trait_contract_name}/{trait_name} HTTP/1.1
Host: localhost:20443
Accept: */*

200

Success

{
  "$ref": "./api/trait/get-is-trait-implemented.example.json"
}

Get the MARF value for a given key

post

Attempt to fetch the value of a MARF key.

In the response, data is the hex serialization of the value.

Path parameters

clarity_marf_keystringRequired

MARF key

Query parameters

proofintegerOptional

Returns object without the proof field when set to 0

tipstringOptional

The Stacks chain tip to query from. If tip == latest, the query will be run from the latest known tip (includes unconfirmed state).

Responses

200

Success

application/json

400

Failed to retrieve MARF key

post

HTTPcURLJavaScriptPython

POST /v2/clarity/marf/{clarity_marf_key} HTTP/1.1
Host: localhost:20443
Accept: */*

{
  "data": "0x0a0c000000010a6d6f6e737465722d69640100000000000000000000000000000001",
  "proof": "0x123..."
}

Get the contract metadata for the metadata key

post

Attempt to fetch the metadata of a contract. The contract is identified with [Contract Address] and [Contract Name] in the URL path. The metadata key is identified with [Clarity Metadata Key].

In the response, data is formatted as JSON.

Path parameters

contract_addressstringRequired

Stacks address

contract_namestringRequired

Contract name

clarity_metadata_keystringRequired

Metadata key

Query parameters

tipstringOptional

The Stacks chain tip to query from. If tip == latest, the query will be run from the latest known tip (includes unconfirmed state).

Responses

200

Success

application/json

400

Failed to retrieve constant value from contract

post

HTTPcURLJavaScriptPython

POST /v2/clarity/metadata/{contract_address}/{contract_name}/{clarity_metadata_key} HTTP/1.1
Host: localhost:20443
Accept: */*

{
  "data": "'{\"contract_identifier\":{...}, \"private_function_types\":{...}'"
}

Get the value of a constant inside a contract

post

Attempt to fetch the value of a constant inside a contract. The contract is identified with [Stacks Address] and [Contract Name] in the URL path. The constant is identified with [Constant Name].

In the response, data is the hex serialization of the constant value.

Path parameters

contract_addressstringRequired

Stacks address

contract_namestringRequired

Contract name

constant_namestringRequired

Constant name

Query parameters

tipstringOptional

The Stacks chain tip to query from. If tip == latest, the query will be run from the latest known tip (includes unconfirmed state).

Responses

200

Success

application/json

400

Failed to retrieve constant value from contract

post

HTTPcURLJavaScriptPython

POST /v2/constant_val/{contract_address}/{contract_name}/{constant_name} HTTP/1.1
Host: localhost:20443
Accept: */*

{
  "data": "0x01ce..."
}

Validate a proposed Stacks block

post

Used by stackers to validate a proposed Stacks block from a miner.

This API endpoint requires a basic Authorization header.

Body

anyOptional

Responses

202

Block proposal has been accepted for processing. The result will be returned via the event observer.

application/json

400

Endpoint not enabled.

401

Unauthorized.

429

There is an ongoing proposal validation being processed, the new request cannot be accepted until the prior request has been processed.

application/json

post

HTTPcURLJavaScriptPython

POST /v3/block_proposal HTTP/1.1
Host: localhost:20443
Content-Type: application/json
Accept: */*
Content-Length: 63

{
  "$ref": "./api/core-node/post-block-proposal-req.example.json"
}

{
  "message": "Block proposal is processing, result will be returned via the event observer",
  "result": "Accepted"
}

Fetch the stacker and signer set information for a given cycle.

get

Used to get stacker and signer set information for a given cycle.

This will only return information for cycles started in Epoch-2.5 where PoX-4 was active and subsequent cycles.

Path parameters

cycle_numberintegerRequired

reward cycle number

Responses

200

Information for the given reward cycle

application/json

400

Could not fetch the given reward set

application/json

get

HTTPcURLJavaScriptPython

GET /v3/stacker_set/{cycle_number} HTTP/1.1
Host: localhost:20443
Accept: */*

{
  "stacker_set": {
    "rewarded_addresses": [
      {
        "Standard": [
          {
            "bytes": "dc5f18421006ee2b98ab972edfa7268a981e3f00",
            "version": 26
          },
          "SerializeP2PKH"
        ]
      }
    ],
    "signers": [
      {
        "signing_key": "02d0a27e4f1bf186b4391eecfcc4d4a0d403684ad089b477b8548a69dd6378bf26",
        "slots": 1,
        "stacked_amt": 2143020000000000
      }
    ],
    "start_cycle_state": {
      "missed_reward_slots": []
    }
  }
}

Fetch a Nakamoto block

get

Fetch a Nakamoto block by its index block hash.

Path parameters

block_idstringRequired

The block's ID hash

Responses

200

The raw SIP-003-encoded block will be returned.

application/octet-stream

Responsestring · binary

404

The block could not be found

application/text-plain

get

HTTPcURLJavaScriptPython

GET /v3/blocks/{block_id} HTTP/1.1
Host: localhost:20443
Accept: */*

binary

Fetch a Nakamoto block by its height and optional tip

get

Fetch a Nakamoto block by its height and optional tip.

Path parameters

block_heightintegerRequired

The block's height

Query parameters

tipstringOptional

The Stacks chain tip to query from. If tip == latest or empty, the query will be run from the latest known tip.

Responses

200

The raw SIP-003-encoded block will be returned.

application/octet-stream

Responsestring · binary

404

The block could not be found

application/text-plain

get

HTTPcURLJavaScriptPython

GET /v3/blocks/height/{block_height} HTTP/1.1
Host: localhost:20443
Accept: */*

binary

Fetch metadata about the ongoing Nakamoto tenure

get

Fetch metadata about the ongoing Nakamoto tenure. This information is sufficient to obtain and authenticate the highest complete tenure, as well as obtain new tenure blocks.

Responses

200

Metadata about the ongoing tenure

application/json

get

HTTPcURLJavaScriptPython

GET /v3/tenures/info HTTP/1.1
Host: localhost:20443
Accept: */*

200

Metadata about the ongoing tenure

{
  "consensus_hash": "4c5a49be0e34dc603b66f090fd07d28a2f76a2ad",
  "parent_consensus_hash": "fa8a04af41957499afdd4082b9b702ffca9a4370",
  "parent_tenure_start_block_id": "0cfec8433849d353ad6b2fe1173da143e3d4a3ab452588a14eb074d0181ac202",
  "reward_cycle": 8,
  "tenure_start_block_id": "0425099d51547c714df6a7864c040c1a605b198ff07f71d19a823139c88a35f8",
  "tip_block_id": "52d64f5e47abc7666c4fed3fe850f381f93f2d588ee2a92a4e07b44f14588d5e",
  "tip_height": 416
}

Fetch a sequence of Nakamoto blocks in a tenure

get

Fetch a sequence of Nakamoto blocks in a tenure. The blocks will be served in order from highest to lowest. The blocks will be encoded in their SIP-003 wire format, and concatenated together.

Path parameters

block_idstringRequired

The tenure-start block ID of the tenure to query

Query parameters

stopstringOptional

The block ID hash of the highest block in this tenure that is already known to the caller. Neither the corresponding block nor any of its ancestors will be served. This is used to fetch tenure blocks that the caller does not have.

Responses

200

SIP-003-encoded Nakamoto blocks, concatenated together

application/octet-stream

Responsestring · binary

get

HTTPcURLJavaScriptPython

GET /v3/tenures/{block_id} HTTP/1.1
Host: localhost:20443
Accept: */*

200

SIP-003-encoded Nakamoto blocks, concatenated together

binary

Fetch information about evaluated burnchain blocks (i.e., sortitions).

get

Fetch sortition information about a burnchain block. If the lookup_kind and lookup parameters are empty, it will return information about the latest burn block.

Path parameters

lookup_kindstringOptional

The style of lookup that should be performed. If not given, the most recent burn block processed will be returned. Otherwise, the lookup_kind should be one of the following strings:

• consensus - find the burn block using the consensus hash supplied in the lookup field.
• burn_height - find the burn block using the burn block height supplied in the lookup field.
• burn - find the burn block using the burn block hash supplied in the lookup field.
• latest_and_last - return information about the latest burn block with a winning miner and the previous such burn block

lookupstringOptional

The value to use for the lookup if lookup_kind is consensus, burn_height, or burn

Responses

200

Information for the burn block or in the case of `latest_and_last`, multiple burn blocks

application/json

get

HTTPcURLJavaScriptPython

GET /v3/sortitions/{lookup_kind}/{lookup} HTTP/1.1
Host: localhost:20443
Accept: */*

200

Information for the burn block or in the case of latest_and_last, multiple burn blocks

{
  "0": {
    "burn_block_hash": "0x046f54cd1924a5d80fc3b8186d0334b7521acae90f9e136e2bee680c720d0e83",
    "burn_block_height": 231,
    "burn_header_timestamp": 1726797570,
    "sortition_id": "0x8a5116b7b4306dc4f6db290d1adfff9e1347f3e921bb793fc4c33e2ff05056e2",
    "parent_sortition_id": "0xdaf479110cf859e58c56b6ae941f8a14e7c7992c57027183dfbda4a4b820897c",
    "consensus_hash": "0x8d2c51db737597a93191f49bcdc9c7bb44b90892",
    "was_sortition": true,
    "miner_pk_hash160": "0x6bc51b33e9f3626944eb879147e18111581f8f9b",
    "stacks_parent_ch": "0x697357c72da55b759b1d6b721676c92c69f0b490",
    "last_sortition_ch": "0x697357c72da55b759b1d6b721676c92c69f0b490",
    "committed_block_hash": "0xeea47d6d639c565027110e192e308fb11656183d5c077bcd718d830652800183",
    "vrf_seed": "0x48b754acc291a5bfad1354ee19bbc471f14af2b21dc7eccc0f929bd16798defe"
  }
}

Get number of blocks signed by signer during a given reward cycle

get

Get number of blocks signed by signer during a given reward cycle

Path parameters

signerstringRequired

Hex-encoded compressed Secp256k1 public key of signer

cycle_numberintegerRequired

Reward cycle number

Responses

200

Number of blocks signed

text/plain

ResponseintegerExample: 7

get

HTTPcURLJavaScriptPython

GET /v3/signer/{signer}/{cycle_number} HTTP/1.1
Host: localhost:20443
Accept: */*

200

Number of blocks signed

7