Simulate gas and fees

Safrochain uses globalfee with a typical minimum of 0.05 usaf per gas unit. Always simulate before broadcasting high-value txs.

REST simulate

REST="https://rest.testnet.safrochain.com"
# POST /cosmos/tx/v1beta1/simulate with encoded tx bytes

CosmJS "auto" gas calls simulate under the hood.

Web (CosmJS)

// MsgSend with auto gas
await client.sendTokens(from, to, [{ denom: 'usaf', amount: '1000' }], 'auto');

// MsgExecuteContract with explicit fee after simulate
const fee = await client.simulate(address, [executeMsg], '');
const gasUsed = Math.ceil(Number(fee) * 1.3);
const result = await client.signAndBroadcast(address, [executeMsg], {
  amount: [{ denom: 'usaf', amount: String(Math.ceil(gasUsed * 0.05)) }],
  gas: String(gasUsed),
});

React Native

Same simulate and 'auto' patterns as web CosmJS. Show the estimated fee on your confirm screen before calling signAndBroadcast.

Flutter (CosmJS)

await client.sendTokens(from, to, [{ denom: 'usaf', amount: '1000' }], 'auto');

const fee = await client.simulate(address, [executeMsg], '');
const gasUsed = Math.ceil(Number(fee) * 1.3);
await client.signAndBroadcast(address, [executeMsg], {
  amount: [{ denom: 'usaf', amount: String(Math.ceil(gasUsed * 0.05)) }],
  gas: String(gasUsed),
});

CLI

safrochaind tx bank send dev "$ADDR" 1usaf \
  --chain-id safro-testnet-1 \
  --node https://rpc.testnet.safrochain.com:443 \
  --gas auto --gas-adjustment 1.3 \
  --gas-prices 0.05usaf \
  --dry-run

CLI flags (reference)

Flag	Role
--gas auto	Simulate and set gas limit
--gas-adjustment 1.3	Safety margin on simulated gas
--gas-prices 0.05usaf	Fee rate per gas unit

See globalfee module for chain-wide minimums.

Next

• Broadcast modes