Solana Workflow Engine That Recovers From Every Failure

{
  "id": "yield_farm_entry",
  "blocks": [
    {
      "type": "step",
      "handler": "check_pool_conditions",
      "retry": { "max_attempts": 3, "backoff": "2s" }
    },
    {
      "type": "step",
      "handler": "swap_usdc_to_sol",
      "retry": { "max_attempts": 5, "backoff": "3s" },
      "compensation": "reverse_swap_sol_to_usdc",
      "rate_limit_key": "rpc:helius",
      "rate_limit": { "max": 50, "window_seconds": 1 }
    },
    {
      "type": "step",
      "handler": "swap_usdc_to_msol",
      "compensation": "reverse_swap_msol_to_usdc"
    },
    {
      "type": "step",
      "handler": "provide_liquidity_orca",
      "retry": { "max_attempts": 10, "backoff": "5s" },
      "compensation": "withdraw_liquidity_orca"
    },
    {
      "type": "step",
      "handler": "stake_lp_token"
    }
  ]
}

// TypeScript handler — Jupiter swap with priority fees
app.post('/workers/swap_usdc_to_sol', async (req, res) => {
  const { context } = req.body;
  const { amount, slippage } = context.data;

  // Get Jupiter quote
  const quote = await jupiter.getQuote({
    inputMint: USDC_MINT,
    outputMint: SOL_MINT,
    amount,
    slippageBps: slippage,
  });

  // Build transaction with priority fee
  const { transaction } = await jupiter.getSwapTransaction({
    quoteResponse: quote,
    userPublicKey: wallet.publicKey,
    prioritizationFeeLamports: 'auto',
  });

  // Sign and send
  const signature = await connection.sendTransaction(
    transaction, { skipPreflight: true }
  );

  // Confirm with timeout
  await connection.confirmTransaction(signature, 'confirmed');

  // Output is memoized — never re-executed on crash
  res.json({
    signature,
    amount_out: quote.outAmount,
    status: 'confirmed'
  });
});

POST /sequences/yield_farm_entry/instances
{
  "context": {
    "data": {
      "amount": 1000000000,
      "slippage": 50,
      "pool": "7XawhbbxtsRcQA8KTkHT9f9nc6d69UwqCDh6U5EEbEmX",
      "min_apy": 12.5
    }
  },
  "idempotency_key": "yield-farm-entry-2026-05-10-pool-7Xaw"
}