fix: check btc balance before start order

Signed-off-by: Gregory Hill <gregorydhill@outlook.com>

Author: gregdhill

sdk/src/gateway/client.ts

@@ -755,6 +755,14 @@ export class GatewayApiClient {
             const { onrampQuote, params } = executeQuoteParams;
             const quote = onrampQuote!;
 
+            const esploraClient = new EsploraClient(this.chain.id === bob.id ? Network.mainnet : Network.signet);
+
+            // TODO: refactor to construct the PSBT instead since it may fund from other inputs
+            const availableBtcBalance = await esploraClient.getBalance(quote.bitcoinAddress);
+            if (availableBtcBalance.total < BigInt(quote.satoshis)) {
+                throw new Error(`Insufficient BTC balance in address ${quote.bitcoinAddress}. Required: ${formatBtc(BigInt(quote.satoshis))}`);
+            }
+
             const { uuid, psbtBase64, bitcoinAddress, satoshis, opReturnHash } = await this.startOnrampOrder(
                 quote,
                 params
@@ -1001,8 +1009,8 @@ export class GatewayApiClient {
                             : (base as NonNullable<typeof base>) // failed
                         : (base as NonNullable<typeof base>) // success
                     : order.strategyAddress // pending
-                      ? (output as NonNullable<typeof output>)
-                      : (base as NonNullable<typeof base>);
+                        ? (output as NonNullable<typeof output>)
+                        : (base as NonNullable<typeof base>);
             }
             const getTokenAddress = (): string => {
                 return getFinal(order.baseTokenAddress, order.outputTokenAddress);
@@ -1046,12 +1054,12 @@ export class GatewayApiClient {
                     return !hasEnoughConfirmations
                         ? { confirmed: false, data }
                         : order.status
-                          ? order.strategyAddress
-                              ? order.outputTokenAddress
-                                  ? { success: true, data }
-                                  : { success: false, data }
-                              : { success: true, data }
-                          : { pending: true, data };
+                            ? order.strategyAddress
+                                ? order.outputTokenAddress
+                                    ? { success: true, data }
+                                    : { success: false, data }
+                                : { success: true, data }
+                            : { pending: true, data };
                 },
             };
         });
@@ -1111,12 +1119,12 @@ export class GatewayApiClient {
                 },
                 outputToken: outputToken
                     ? {
-                          symbol: outputToken.symbol,
-                          address: outputToken.address,
-                          logo: outputToken.logoURI,
-                          decimals: outputToken.decimals,
-                          chain: chainName,
-                      }
+                        symbol: outputToken.symbol,
+                        address: outputToken.address,
+                        logo: outputToken.logoURI,
+                        decimals: outputToken.decimals,
+                        chain: chainName,
+                    }
                     : null,
             };
         });