Massa JSON-RPC API

Through the API documentation, you can find out how to make calls and handle responses.

Massa JSON-RPC API is splitted in two parts:

Private API: used for node management. Default port: 33034 e.g. http://localhost:33034
Public API: used for blockchain interactions. Default port: 33035 e.g. http://localhost:33035

Find the complete Massa OpenRPC specification here.

Note

We provide an Interactive API Specification which documents every available method and allows you to play with the API.

Warning

Massa has a new experimental API with both Http and WebSocket support: Default port: 33036

Http: used for node management and blockchain interactions. e.g. http://localhost:33036
WebSocket: used for streaming blockchain events. e.g. ws://localhost:33036

Integrations

JavaScript: see massa-web3.js.

Postman: is a tool for software developers to create, test and debug API requests. More details can be found in Postman learning center. Find all maintained Massa Postman collections in our official workspace.

Massa RPC enpoints

Here are the public RPC endpoints currently available.

Name	Address	Features
Massa	https://test.massa.net/api/v2	JsonRPC

Error codes

When a call to Massa API fails, it MUST return a valid JSON-RPC error object .

Code	Message	Meaning
-32600	Invalid request	The JSON sent is not a valid Request object
-32601	Method not found	The method does not exist / is not available
-32602	Invalid params	Invalid method parameter(s)
-32603	Internal error	Internal JSON-RPC error
-32700	Parse error	Invalid JSON, parsing issue
-32000	Bad request	Indicates that the server cannot or will not process the request due to something that is perceived to be a client error (for example, malformed request syntax, invalid request message framing, or deceptive request routing)
-32001	Internal server error	The server encountered an unexpected issue
-32003	Service Unavailable	Indicates that the server is not ready to handle the request
-32004	Not found	Indicates that the server cannot find the requested resource
-32005	Method not allowed	Indicates that the server knows the request method, but the target resource doesn’t support this method
-32006	Send channel error	Send channel error
-32007	Receive channel error	Receive channel error
-32008	Massa hash error	`massa_hash` error
-32009	Consensus error	Error from Consensus module
-32010	Execution error	Error from Execution module
-32012	Protocol error	Error from Protocol module
-32013	Models error	Error in Models
-32014	Time error	Error from Time module
-32015	Wallet error	Error from Wallet module
-32016	Inconsistency error	Inconsistency in the result of request
-32017	Missing command sender	Missing command sender
-32018	Missing config	Missing configuration
-32019	Wrong API	The wrong API (either Public or Private) was called

Error example:

{
"jsonrpc": "2.0",
"error": {
    "code": -32400,
    "message": "Bad request: too many arguments, maximum authorized 2 but found 3"
},
"id": 1
}

WebSockets support

In this section we’ll learn how to enable and subscribe to WebSockets via Postman client.

Warning

Experimental support for WebSocket is a feature that is subject to change in a future releases.

Available subscriptions:

subscribe_new_blocks/unsubscribe_new_blocks: subscribe/unsubscribe to/from new produced blocks.
subscribe_new_blocks_headers/unsubscribe_new_blocks_headers: subscribe/unsubscribe to/from new produced blocks headers.
subscribe_new_filled_blocks/unsubscribe_new_filled_blocks: subscribe/unsubscribe to/from new produced filled blocks with operations content.
subscribe_new_operations/unsubscribe_new_operations: subscribe/unsubscribe to/from new produced operations.

To enable WebSocket support in Massa node, edit file massa-node/config/config.toml (create it if absent) with the following contents:

[api]
    # whether to enable WS.
      {
    enable_ws = true

Postman brings support for WebSocket APIs, more information about it here.

run the massa node
connect to ws://localhost:33036

send the request message:

    "jsonrpc": "2.0",
    "id": 1,
    "method": "subscribe_new_filled_blocks",
    "params": []
}

If the request succeed, the response will contains a subscription id:

{
    "jsonrpc": "2.0",
    "result": 3508678639232691,
    "id": 1
}

Result:

{
    "jsonrpc": "2.0",
    "method": "new_filled_blocks",
    "params": {
        "subscription": 3508678639232691,
        "result": "FILLED_BLOCK_CONTENT_0"
    }
}

A message is received everytime a filled block is produced:

{
    "jsonrpc": "2.0",
    "method": "new_filled_blocks",
    "params": {
        "subscription": 3508678639232691,
        "result": "FILLED_BLOCK_CONTENT_N"
    }
}

unsubscribe and stop receiving new filled blocks:

{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "unsubscribe_new_filled_blocks",
    "params": [3508678639232691]
}

Result:

{
    "jsonrpc": "2.0",
    "result": true,
    "id": 1
}

TEST.23.0 .. note:

Multiple subscriptions are supported

Explore Massa Blockchain

In this section we’ll learn how to interact with Massa blockchain via curl commands which will create JSON-RPC request calls.

Warning

We’ll use only public API methods in testnet node.

Public API

a.k.a. user mode methods (running on https://test.massa.net/api/v2)

get_status

Summary of the current state: time, last final blocks (hash, thread, slot, timestamp), clique count, connected nodes count.

Query:

curl --location --request POST 'https://test.massa.net/api/v2' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "get_status",
    "params": []
}'

Result:

{
"jsonrpc": "2.0",
"result": {
    "node_id": "N1VRyXjUaHeJd4Rmr3waVmpZDFzzH5ARRi3f5ye5BYgxBmxHC7X",
    "node_ip": "141.94.218.103",
    "version": "TEST.23.0",
    "current_time": 1678095036319,
    "current_cycle": 201,
    "current_cycle_time": 1678094448000,
    "next_cycle_time": 1678096496000,
    "connected_nodes": {
        "N13Ykon8Zo73PTKMruLViMMtE2rEG646JQ4sCcee2DnopmVM3P5": [
            "51.75.60.228",
            false
        ],
        ...
        "N12v69D3R9DRQefDVMRuJv4nzkLTtvcoa42pWixZq3zJQPeSBGSh": [
            "46.4.76.149",
            true
        ]
    },
    "last_slot": {
        "period": 25764,
        "thread": 24
    },
    "next_slot": {
        "period": 25764,
        "thread": 25
    },
    "consensus_stats": {
        "start_timespan": 1678094976319,
        "end_timespan": 1678095036319,
        "final_block_count": 120,
        "stale_block_count": 0,
        "clique_count": 1
    },
    "pool_stats": [
        482673,
        1322
    ],
    "network_stats": {
        "in_connection_count": 18,
        "out_connection_count": 13,
        "known_peer_count": 10033,
        "banned_peer_count": 0,
        "active_node_count": 31
    },
    "execution_stats": {
        "time_window_start": 1678094976319,
        "time_window_end": 1678095036319,
        "final_block_count": 120,
        "final_executed_operations_count": 183229,
        "active_cursor": {
            "period": 25764,
            "thread": 20
        }
    },
    "config": {
        "genesis_timestamp": 1677682800000,
        "end_timestamp": 1680292800000,
        "thread_count": 32,
        "t0": 16000,
        "delta_f0": 1088,
        "operation_validity_periods": 10,
        "periods_per_cycle": 128,
        "block_reward": "0.30",
        "roll_price": "100",
        "max_block_size": 1000000
    }
},
"id": 1
}

get_cliques

Get information about the block cliques of the graph.

Query:

curl --location --request POST 'https://test.massa.net/api/v2' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "get_cliques",
    "params": []
}'

Result:

{
"jsonrpc": "2.0",
"result": [
    {
        "block_ids": [
            "B12RHJKyPx8DdGHMevdP8Uyxidcg3nThb9XEnHXEJR7cbBi6JrR9",
            ...
            "B12c7xPkmdy3qbAF1rWn7XeTBdum6VHbYJiW5MUuyBGnshrf5NW8"
        ],
        "fitness": 1117,
        "is_blockclique": true
    }
],
"id": 1
}

get_stakers

Get information about active stakers and their roll counts for the current cycle.

Query:

curl --location --request POST 'https://test.massa.net/api/v2' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "get_stakers",
    "params": [ {"offset": 0, "limit": 2 }]
}'

Result:

{
"jsonrpc": "2.0",
"result": [
    [
        "AU12gAkmGeozFceJD4tQmbVvihYdX2KyWZcYLL8xdYZeP4EuWYdex",
        145
    ],
    [
        "AU18A67vpbjHPq7KgFnMbezoJuGcjVLZsF4ybx4rEbnA3wZ1Gy7c",
        124
    ]
],

get_addresses

Get information about address (es) (balances, block creation, …).

Query:

curl --location --request POST 'https://test.massa.net/api/v2' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "get_addresses",
    "params": [["AU12gAkmGeozFceJD4tQmbVvihYdX2KyWZcYLL8xdYZeP4EuWYdex"]]
}'

Result:

 {
"jsonrpc": "2.0",
"result": [
    {
        "address": "AU12gAkmGeozFceJD4tQmbVvihYdX2KyWZcYLL8xdYZeP4EuWYdex",
        "thread": 27,
        "final_balance": "153.519945908",
        "final_roll_count": 145,
        "final_datastore_keys": [],
        "candidate_balance": "153.755240036",
        "candidate_roll_count": 145,
        "candidate_datastore_keys": [],
        "deferred_credits": [],
        "next_block_draws": [
            {
                "period": 25784,
                "thread": 5
            },
            ...
            {
                "slot": {
                    "period": 25791,
                    "thread": 29
                },
                "index": 1
            }
        ],
        "created_blocks": [
            "B12Y4eqmeJ5uWakcgZXRqDxRzFstKt8KJd2MgMSysqcMX4eWoaw4",
            "B12CANhVvuBpXtjyVS5kkZBGmw5wanvEuuF34ct3GABHLLAMroxT",
            "B122nYsgcJ72Cor9RcZB6ZGduc4pFm97srfGEPiijeZq9k1VatBS",
            "B12TC646QjDoQWAPuAYhsy9i8f3qdzajFas25eJsRXaj1mbBhGRk",
            "B12aFhukUBCz8TXJK5SakyT6MW18GTFNiRoeUKqzXT6e2ePbutor"
        ],
        "created_operations": [],
        "created_endorsements": [
            "E12uK8JkAkMpC5gDXaa26Vxvu8nRL5ZvD61WFjToeyTDVexnzYcH",
            ...
            "E12XbfbSzPvVRyW1mGhxBpkrDBzVdGdZvRkaYpDbrUP96fCZteSy"
        ],
        "cycle_infos": [
            {
                "cycle": 197,
                "is_final": true,
                "ok_count": 48,
                "nok_count": 0,
                "active_rolls": null
            },
            ...
            {
                "cycle": 201,
                "is_final": false,
                "ok_count": 11,
                "nok_count": 0,
                "active_rolls": 145
            }
        ]
    }
],
"id": 1
}

get_graph_interval

Get information about block graph within the specified time interval.

Query:

curl --location --request POST 'https://test.massa.net/api/v2' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "get_graph_interval",
    "params": [{"start": 1678095527706, "end": 1678095529706}]
}'

Result:

{
"jsonrpc": "2.0",
"result": [
    {
        "id": "B1pd4hCpPnHM8QMvKp9uGM5sdUZoq6s9wERwk7z9ANoo8FSTJ7j",
        "is_final": false,
        "is_stale": false,
        "is_in_blockclique": true,
        "slot": {
            "period": 25795,
            "thread": 17
        },
        "creator": "AU12tr8pSnamJRQEdm4K9DaogpdANXF636XNV13iNHAL6bLpKxooR",
        "parents": [
            "B12echxHFVHsCsWaRxL5pxPmYtefjhuJDNtd7TX6iseF6jxdyZnS",
            ...
            "B12WQuyYopKPLkK9HF2eRaJDRbnE2cAhqT19XpGT2gMh9o4E2BrL"
        ]
    },
    {
        "id": "B12G3GVLNct669ZiAQQDsXW9Mbo5PHtmwrEKNAvnBVa11kqqps5n",
        "is_final": false,
        "is_stale": false,
        "is_in_blockclique": true,
        "slot": {
            "period": 25795,
            "thread": 16
        },
        "creator": "AU1LJYrJQiQZYqiktgrbb5MWgSnd1FuUQqhQsw48PPdrAB3uqLCS",
        "parents": [
            "B12echxHFVHsCsWaRxL5pxPmYtefjhuJDNtd7TX6iseF6jxdyZnS",
            ...
            "B12WQuyYopKPLkK9HF2eRaJDRbnE2cAhqT19XpGT2gMh9o4E2BrL"
        ]
    },
    {
        "id": "B12RYZz9S8PuqWvQUFStxmTDb4j3UqfVEkNqeBwYDvwCrnzBMJ8J",
        "is_final": false,
        "is_stale": false,
        "is_in_blockclique": true,
        "slot": {
            "period": 25795,
            "thread": 18
        },
        "creator": "AU1vWZXTD4YdfdbqWS3RRgnH5DBdJSfgwVi9vJztH2V3iNMakzKo",
        "parents": [
            "B12echxHFVHsCsWaRxL5pxPmYtefjhuJDNtd7TX6iseF6jxdyZnS",
            ...
            "B12WQuyYopKPLkK9HF2eRaJDRbnE2cAhqT19XpGT2gMh9o4E2BrL"
        ]
    }
],
"id": 1
}

get_blocks

Get information about block(s) <https://docs.massa.net/en/latest/general-doc/architecture/archi-intro.html#block>__ associated to a given hash(s). - Query:

curl --location --request POST 'https://test.massa.net/api/v2' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "get_blocks",
    "params": [["B122ByHzPVJ3QFwmuYcZ4vZYzq6rfkqx7BJSJdFNHWp9j2o5Fpxv"]]
}'

Result:

{
"jsonrpc": "2.0",
"result": [
    {
        "id": "B122ByHzPVJ3QFwmuYcZ4vZYzq6rfkqx7BJSJdFNHWp9j2o5Fpxv",
        "content": {
            "is_final": true,
            "is_in_blockclique": false,
            "is_candidate": false,
            "is_discarded": false,
            "block": {
                "header": {
                    "content": {
                        "slot": {
                            "period": 25787,
                            "thread": 4
                        },
                        "parents": [
                            "B12L3Cvj8EZiX6sCryti4fqZ3nZ4tbDiYjtyAxVoYfJUxfPuN2Lm",
                            ...
                            "B1xMgVk5hcp8qdFzvCeG3SqS3AA4i52fAXw7kZn4DzJWnXGgZDW"
                        ],
                        "operation_merkle_root": "8uJok77DvcHgdzqzMQ62yu6nV9tKqTU6JhsCtvWxBK6VsabSZ",
                        "endorsements": [
                            {
                                "content": {
                                    "slot": {
                                        "period": 25787,
                                        "thread": 4
                                    },
                                    "index": 0,
                                    "endorsed_block": "B1PF5E4D3LKa6soJ8BXv6nveHFHRPzBYtqysVWhLZT5fmnedc6T"
                                },
                                "signature": "V21cLHbr5mUzpRrRHc66EkvsDh5KZHvWKfFhFo2B2ni9qVK9p8nhPuE14btaWXAN7ru4d7q7jm9TcW55McXd2smhd6NbP",
                                "content_creator_pub_key": "P1bi78ormwmdSYuvmk77ZbQsyz4VDqEZZGKnXVWyksJYitx6nwJ",
                                "content_creator_address": "AU12ta1W4CcLrQmBAYEc7BPCopj8zqyJzBmFncYcXQQw2N2M5SC6U",
                                "id": "E1KLYEDm4qBUxi1SDHo3tf3dCGJ5kDYL3w8N766KgnYZV6A7omy"
                            },
                            ...
                            {
                                "content": {
                                    "slot": {
                                        "period": 25787,
                                        "thread": 4
                                    },
                                    "index": 15,
                                    "endorsed_block": "B1PF5E4D3LKa6soJ8BXv6nveHFHRPzBYtqysVWhLZT5fmnedc6T"
                                },
                                "signature": "E3HGbZvJEPVZcRUYDUpnk4R8t9p941MKZTK3awTXTMpG1pufThBu9CpNd7YDW1mkEc4ZJB31Hcvp8cKVPe57MBUJutu1c",
                                "content_creator_pub_key": "P123qyM3ZzUw5Mi7uxj8mKYNHo7H7ybTQWZy53cR7BHhXbTxrT8z",
                                "content_creator_address": "AU1Xr8m6utu6DBXyRCFGrD2jPCa62tnwNwkkJSCnh4iWQG3M63za",
                                "id": "E12rQSKKLw1wXBXajvjGS9PB8NYEhuDf2TxKgQ7PfAccEff51QyM"
                            }
                        ]
                    },
                    "signature": "4vKvfytWkgv5YjTQQiVwADpBMpvAF6W79KBHzAs1iybLswUZ2VhWPh6dMTnifVeiBYXVJuvgcMkKkRH8VjL2izkRVTAxs",
                    "content_creator_pub_key": "P1snABBASHQQuCDERNdUBzg2kJ37LLFK8L7sgBoBd32mRU38ev9",
                    "content_creator_address": "AU1WqP6GTsR8w4eyRPHQkrQhujmRb3hmLaQt3HZfeTVHWVZade48",
                    "id": "B122ByHzPVJ3QFwmuYcZ4vZYzq6rfkqx7BJSJdFNHWp9j2o5Fpxv"
                },
                "operations": [
                    "O116jye7zBAttWHfCufcMVQEQaa9JMTqv6To5mE2CzmzBs7cZ7W",
                    ...
                    "O12we35pSQhP8i31B2i9wXRNgfkFMCN7CUGgF2HCoRj1XB3LXUNw"
                ]
            }
        }
    }
],
"id": 1
}

get_operations

Get information about operation (s) information associated to a given operation(s) ID(s).

Query:

curl --location --request POST 'https://test.massa.net/api/v2' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "get_operations",
    "params": [["O1LMr9xyL9fVSbUvZao4jy6t2Pj5UPtLG8x1fxvS6SD7dPb5S52"]]
}'

Result:

{
"jsonrpc": "2.0",
"result": [
    {
        "id": "O1LMr9xyL9fVSbUvZao4jy6t2Pj5UPtLG8x1fxvS6SD7dPb5S52",
        "in_pool": true,
        "in_blocks": [
            "B1CM6E6CcSvFtXD1VHhVezt9CvpUGsB7TcSh3Z9k1HW6J3zLDyP"
        ],
        "is_operation_final": false,
        "thread": 8,
        "operation": {
            "content": {
                "fee": "0",
                "expire_period": 25824,
                "op": {
                    "Transaction": {
                        "recipient_address": "AU12WQRoxQJKMjNG8hVjkyh4YgBwaYeUH4BsqJEEdTUJda37GhSx9",
                        "amount": "0.000600754"
                    }
                }
            },
            "signature": "D3JUUhPiQTDvdYKa4Gv38xUNSpfHbYUU9qsw3rLypwZdjbniVdmHn15VnaF1NDrmSqUPf6UFs5xpDmid3xzmMqoXBV83",
            "content_creator_pub_key": "P1YSCrgzD8QXQCmMUEqrGvroBsu9UMCbWJUgCUnW3txDyFajBW5",
            "content_creator_address": "AU1Y6Zhw2GWt2ETWxyym3GnJSv4ZW3rXRQVxcLUDprB3ybr5LKAq",
            "id": "O1LMr9xyL9fVSbUvZao4jy6t2Pj5UPtLG8x1fxvS6SD7dPb5S52"
        },
        "op_exec_status": true
    }
],
"id": 1
}

get_endorsements

Get information about endorsement (s) (content, finality …)

Query:

curl --location --request POST 'https://test.massa.net/api/v2' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "get_endorsements",
    "params": [["E12kB72Jz4iMWkVkckS2e6cUBm4e5XEW77biDjSysAWmQkNrvuJr"]]
}'

Result:

{
"jsonrpc": "2.0",
"result": [
    {
        "id": "E12kB72Jz4iMWkVkckS2e6cUBm4e5XEW77biDjSysAWmQkNrvuJr",
        "in_pool": false,
        "in_blocks": [
            "B1CM6E6CcSvFtXD1VHhVezt9CvpUGsB7TcSh3Z9k1HW6J3zLDyP"
        ],
        "is_final": true,
        "endorsement": {
            "content": {
                "slot": {
                    "period": 25817,
                    "thread": 8
                },
                "index": 6,
                "endorsed_block": "B17nShoffS6PVyB1qZQSgLmgWvczzPDinhkcHWUxWP2q9fg646A"
            },
            "signature": "H6bsbwfUwkyMYdKU7vdWdft61bCacYPv77Gsxmp9rng7wTZSRYjuqXi6uy5eFwh8qM9iggRAabumbv4ZT9ChC42ZVYeuK",
            "content_creator_pub_key": "P12KNCqp2tSrQtFBF8wUxDJ1aSdrvyqg6UPShhXUVSWA9udJFcfV",
            "content_creator_address": "AU1AZf2B9Cn3V7zSvoCm7Egdi5ZUx5m35sADYHcPujHsb2fLPQXs",
            "id": "E12kB72Jz4iMWkVkckS2e6cUBm4e5XEW77biDjSysAWmQkNrvuJr"
        }
    }
],
"id": 1
}