Interact from apps

dApps talk to contracts via smart queries (read) and MsgExecuteContract (write).

Web (CosmJS)

import { MsgExecuteContract } from 'cosmjs-types/cosmwasm/wasm/v1/tx';

const msg = {
  typeUrl: '/cosmwasm.wasm.v1.MsgExecuteContract',
  value: MsgExecuteContract.fromPartial({
    sender: address,
    contract: contractAddr,
    msg: new TextEncoder().encode(JSON.stringify({ transfer: { recipient, amount } })),
    funds: [],
  }),
};

const result = await client.signAndBroadcast(address, [msg], 'auto');

Smart query via REST:

curl -s "$REST/cosmwasm/wasm/v1/contract/$ADDR/smart/$QUERY_B64"

React Native

Same MsgExecuteContract structure as web. Encode JSON msg with TextEncoder (available in RN).

For SafHandle resolve, call smart query then pass address to sendTokens.

Flutter (CosmJS)

import { MsgExecuteContract } from 'cosmjs-types/cosmwasm/wasm/v1/tx';

const msg = {
  typeUrl: '/cosmwasm.wasm.v1.MsgExecuteContract',
  value: MsgExecuteContract.fromPartial({
    sender: address,
    contract: contractAddr,
    msg: new TextEncoder().encode(JSON.stringify({ resolve: { name: 'john' } })),
    funds: [],
  }),
};

const result = await client.signAndBroadcast(address, [msg], 'auto');

Same CosmJS MsgExecuteContract shape as web. Smart queries use REST or StargateClient helpers.

SafHandle example

1. Resolve @john via getAddress or smart query
2. Use returned addr_safro in MsgSend
3. To register: Register names
4. See Payments flow

Next

• Local dev and testing
• wasm module (CLI reference)