fix: add maxfeepergas buffer on intents, set failure receipts

tools/preconf-rpc/fastswap/fastswap.go

@@ -224,12 +224,12 @@ func (s *Service) callBarter(ctx context.Context, reqBody barterRequest, logDesc
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", s.barterAPIKey))
 
-	s.logger.Debug("calling Barter API",
+	s.logger.Info("calling Barter API",
 		"type", logDescription,
-		"url", s.barterBaseURL+"/swap",
-		"source", reqBody.Source,
-		"target", reqBody.Target,
-		"sellAmount", reqBody.SellAmount,
+		"inputToken", reqBody.Source,
+		"outputToken", reqBody.Target,
+		"inputAmount", reqBody.SellAmount,
+		"outputAmount", reqBody.MinReturn,
 	)
 
 	resp, err := s.httpClient.Do(req)
@@ -384,7 +384,8 @@ func (s *Service) HandleSwap(ctx context.Context, req SwapRequest) (*SwapResult,
 		nextBaseFee = big.NewInt(30_000_000_000) // 30 gwei fallback
 	}
 	gasTipCap := big.NewInt(0) // No priority fee - mev-commit bid handles inclusion
-	gasFeeCap := nextBaseFee   // GasFeeCap = BaseFee (tip is 0)
+	// add buffer to fee cap to account for changes
+	gasFeeCap := new(big.Int).Mul(nextBaseFee, big.NewInt(2))
 
 	// 6. Build the transaction
 	chainID := big.NewInt(int64(s.chainID))

tools/preconf-rpc/sender/sender.go

@@ -111,6 +111,7 @@ type Store interface {
 	DeductBalance(ctx context.Context, account common.Address, amount *big.Int) error
 	StoreTransaction(ctx context.Context, txn *Transaction, commitments []*bidderapiv1.Commitment, logs []*types.Log) error
 	GetTransactionByHash(ctx context.Context, txnHash common.Hash) (*Transaction, error)
+	StoreReceipt(ctx context.Context, receipt *types.Receipt) error
 }
 
 type Bidder interface {
@@ -579,6 +580,23 @@ func (t *TxSender) processQueuedTransactions(ctx context.Context) {
 					txn.Status = TxStatusFailed
 					txn.Details = err.Error()
 					t.clearBlockAttemptHistory(txn, time.Now())
+
+					// Store a failed receipt to unblock the user's wallet
+					receipt := &types.Receipt{
+						Type:              txn.Transaction.Type(),
+						Status:            types.ReceiptStatusFailed,
+						TxHash:            txn.Hash(),
+						ContractAddress:   common.Address{},
+						GasUsed:           0, // 0 since no execution happened
+						CumulativeGasUsed: 0,
+						BlockHash:         common.Hash{}, // Pending/Unknown
+						BlockNumber:       big.NewInt(0), // Pending/Unknown
+						TransactionIndex:  0,
+					}
+					if storeErr := t.store.StoreReceipt(ctx, receipt); storeErr != nil {
+						t.logger.Error("Failed to store failed receipt", "error", storeErr)
+					}
+
 					defer t.signalReceiptAvailable(txn.Hash())
 					return t.store.StoreTransaction(ctx, txn, nil, nil)
 				}

tools/preconf-rpc/sender/sender_test.go

@@ -162,6 +162,13 @@ func (m *mockStore) GetTransactionByHash(
 	return txn, nil
 }
 
+func (m *mockStore) StoreReceipt(
+	ctx context.Context,
+	receipt *types.Receipt,
+) error {
+	return nil
+}
+
 type bidOp struct {
 	bidAmount   *big.Int
 	slashAmount *big.Int