RPC

Tendermint supports the following RPC protocols:

URI over HTTP
JSONRPC over HTTP
JSONRPC over websockets

Tendermint RPC is build using our own RPC library. Documentation and tests for that library could be found at tendermint/rpc/lib directory.

Configuration

Set the laddr config parameter under [rpc] table in the $TMHOME/config.toml file or the --rpc.laddr command-line flag to the desired protocol://host:port setting. Default: tcp://0.0.0.0:46657.

Arguments

Arguments which expect strings or byte arrays may be passed as quoted strings, like "abc" or as 0x-prefixed strings, like 0x616263.

URI/HTTP

Example request:

curl -s 'http://localhost:46657/broadcast_tx_sync?tx="abc"' | jq .

Response:

{
  "error": "",
  "result": {
    "hash": "2B8EC32BA2579B3B8606E42C06DE2F7AFA2556EF",
    "log": "",
    "data": "",
    "code": 0
  },
  "id": "",
  "jsonrpc": "2.0"
}

The first entry in the result-array (96) is the method this response correlates with. 96 refers to "ResultTypeBroadcastTx", see responses.go for a complete overview.

JSONRPC/HTTP

JSONRPC requests can be POST'd to the root RPC endpoint via HTTP (e.g. http://localhost:46657/).

Example request:

{
  "method": "broadcast_tx_sync",
  "jsonrpc": "2.0",
  "params": [ "abc" ],
  "id": "dontcare"
}

JSONRPC/websockets

JSONRPC requests can be made via websocket. The websocket endpoint is at /websocket, e.g. http://localhost:46657/websocket. Asynchronous RPC functions like event subscribe and unsubscribe are only available via websockets.

Endpoints

An HTTP Get request to the root RPC endpoint (e.g. http://localhost:46657) shows a list of available endpoints.

Available endpoints:
http://localhost:46657/abci_info
http://localhost:46657/dump_consensus_state
http://localhost:46657/genesis
http://localhost:46657/net_info
http://localhost:46657/num_unconfirmed_txs
http://localhost:46657/status
http://localhost:46657/unconfirmed_txs
http://localhost:46657/unsafe_flush_mempool
http://localhost:46657/unsafe_stop_cpu_profiler
http://localhost:46657/validators

Endpoints that require arguments:
http://localhost:46657/abci_query?path=_&data=_&prove=_
http://localhost:46657/block?height=_
http://localhost:46657/blockchain?minHeight=_&maxHeight=_
http://localhost:46657/broadcast_tx_async?tx=_
http://localhost:46657/broadcast_tx_commit?tx=_
http://localhost:46657/broadcast_tx_sync?tx=_
http://localhost:46657/commit?height=_
http://localhost:46657/dial_seeds?seeds=_
http://localhost:46657/subscribe?event=_
http://localhost:46657/tx?hash=_&prove=_
http://localhost:46657/unsafe_start_cpu_profiler?filename=_
http://localhost:46657/unsafe_write_heap_profile?filename=_
http://localhost:46657/unsubscribe?event=_

tx

Returns a transaction matching the given transaction hash.

Parameters

hash - the transaction hash
prove - include a proof of the transaction inclusion in the block in the result (optional, default: false)

Returns

proof: the types.TxProof object
tx: []byte - the transaction
tx_result: the abci.Result object
index: int - index of the transaction
height: int - height of the block where this transaction was in

Example

curl -s 'http://localhost:46657/broadcast_tx_commit?tx="abc"' | jq .
# {
#   "error": "",
#   "result": {
#     "hash": "2B8EC32BA2579B3B8606E42C06DE2F7AFA2556EF",
#     "log": "",
#     "data": "",
#     "code": 0
#   },
#   "id": "",
#   "jsonrpc": "2.0"
# }

curl -s 'http://localhost:46657/tx?hash=0x2B8EC32BA2579B3B8606E42C06DE2F7AFA2556EF' | jq .
# {
#   "error": "",
#   "result": {
#     "proof": {
#       "Proof": {
#         "aunts": []
#       },
#       "Data": "YWJjZA==",
#       "RootHash": "2B8EC32BA2579B3B8606E42C06DE2F7AFA2556EF",
#       "Total": 1,
#       "Index": 0
#     },
#     "tx": "YWJjZA==",
#     "tx_result": {
#       "log": "",
#       "data": "",
#       "code": 0
#     },
#     "index": 0,
#     "height": 52
#   },
#   "id": "",
#   "jsonrpc": "2.0"
# }

More Examples

See the various bash tests using curl in test/, and examples using the Go API in rpc/client/.

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RPC