Feature request: Add example for testing contracts that interact with external APIs (DeDust, STON.fi)

[spendollars]

Feature Request

When building TON smart contracts or agents that interact with DeFi protocols (DeDust, STON.fi), there is no clear guide on how to:

1. Mock external API calls in sandbox tests
2. Test price oracle interactions
3. Simulate DEX swap flows in a local environment

Use Case

Many real-world TON contracts query external APIs for price data or trigger swaps. Currently developers have to either:

• Skip testing these integrations entirely
• Run tests against real mainnet/testnet (slow, costs gas)

Proposed Addition

An example in the examples/ directory showing:

// Example: Testing a price monitor contract with mocked DeDust prices
import { Blockchain, SandboxContract } from '@ton/sandbox';
import { PriceMonitorContract } from '../build/PriceMonitor';

describe('PriceMonitor', () => {
  let blockchain: Blockchain;
  let contract: SandboxContract<PriceMonitorContract>;

  beforeEach(async () => {
    blockchain = await Blockchain.create();
    // How to mock external price feeds?
    contract = blockchain.openContract(PriceMonitorContract.createFromConfig({
      targetPrice: toNano('6.0'), // 6 USDT per TON
    }));
  });

  it('should trigger alert when price exceeds target', async () => {
    // ...
  });
});

Context

Built TON Agent Platform which creates AI agents for TON DeFi — this was a real gap we encountered during development.