Events and WebSockets

CometBFT exposes a WebSocket at /websocket on the RPC host.

Web / Node

npm i -g wscat
wscat -c wss://rpc.testnet.safrochain.com/websocket

Subscribe to new blocks:

{
  "jsonrpc": "2.0",
  "method": "subscribe",
  "id": 1,
  "params": { "query": "tm.event='NewBlock'" }
}

Subscribe to transactions:

{
  "jsonrpc": "2.0",
  "method": "subscribe",
  "id": 2,
  "params": { "query": "tm.event='Tx'" }
}

Filter wasm events:

tm.event='Tx' AND wasm._contract_address='addr_safro1...'

React Native

WebSocket drains battery on mobile. Prefer:

1. Poll GET /cosmos/tx/v1beta1/txs?events=... after broadcast
2. Short-lived WS only on active "waiting for confirmation" screens

Flutter (CosmJS)

// Prefer polling after broadcast (battery-friendly)
const txRes = await fetch(
  `https://rest.testnet.safrochain.com/cosmos/tx/v1beta1/txs/${txHash}`,
);
const tx = await txRes.json();

Optional: short-lived WebSocket only on a "waiting for confirmation" screen.

Related

• Query the chain
• Broadcast modes