Add P2P quote destinations

mintlify/global-accounts/index.mdx

@@ -25,7 +25,7 @@ import Concepts from '/snippets/global-accounts/concepts.mdx';
     Give each customer a branded account experience backed by Grid account infrastructure.
   </FeatureCard>
   <FeatureCard icon="/images/icons/coins.svg" title="Stablecoin balances">
-    Hold dollar-denominated value and use Grid quotes to move between account balances and supported rails.
+    Hold dollar-denominated value and use Grid quotes to move between account balances, other Global Accounts, Spark addresses, and supported rails.
   </FeatureCard>
   <FeatureCard icon="/images/icons/globe.svg" title="Local off-ramps">
     Let customers move value to supported local bank rails, including corridors such as PIX, UPI, SEPA, FPS, and more.

mintlify/snippets/global-accounts/walkthrough.mdx

@@ -360,6 +360,64 @@ curl -X POST "$GRID_BASE_URL/quotes/Quote:019542f5-b3e7-1d02-0000-000000000006/e
 
 The transaction is on its way. You'll receive standard transaction webhooks (`OUTGOING_PAYMENT`) as it settles — see [Transaction lifecycle](/platform-overview/core-concepts/transaction-lifecycle).
 
+## Send to another Global Account or Spark address
+
+Use the same quote and signature flow to send USDB without converting it. Set
+the source to the sender's Embedded Wallet account and choose one of these
+destinations:
+
+- `ACCOUNT` with another Embedded Wallet's internal account ID.
+- `CUSTOMER` with a customer ID on your platform. Grid resolves that
+  customer's Embedded Wallet account in the source currency.
+- `SPARK_ADDRESS` with any compatible Spark address, including a wallet outside
+  your platform.
+
+The quote returns `payloadToSign` as shown above. Embedded Wallet sources do not
+support `immediatelyExecute`; stamp the payload and call
+`POST /quotes/{quoteId}/execute`.
+
+<CodeGroup>
+```bash Customer ID
+curl -X POST "$GRID_BASE_URL/quotes" \
+  -u "$GRID_CLIENT_ID:$GRID_CLIENT_SECRET" \
+  -H "Content-Type: application/json" \
+  -H "Idempotency-Key: 33d31868-f45f-4f02-bda0-f57b147e1695" \
+  -d '{
+    "source": {
+      "sourceType": "ACCOUNT",
+      "accountId": "InternalAccount:019542f5-b3e7-1d02-0000-000000000002"
+    },
+    "destination": {
+      "destinationType": "CUSTOMER",
+      "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000003"
+    },
+    "lockedCurrencySide": "SENDING",
+    "lockedCurrencyAmount": 10000000,
+    "description": "Dinner"
+  }'
+```
+
+```bash Spark address
+curl -X POST "$GRID_BASE_URL/quotes" \
+  -u "$GRID_CLIENT_ID:$GRID_CLIENT_SECRET" \
+  -H "Content-Type: application/json" \
+  -H "Idempotency-Key: d7da1014-6130-43b4-a338-b8f705efdb43" \
+  -d '{
+    "source": {
+      "sourceType": "ACCOUNT",
+      "accountId": "InternalAccount:019542f5-b3e7-1d02-0000-000000000002"
+    },
+    "destination": {
+      "destinationType": "SPARK_ADDRESS",
+      "sparkAddress": "spark1pgssyuuuhnrrdjswal5c3s3rafw9w3y5dd4cjy3duxlf7hjzkp0rqx6dj6mrhu"
+    },
+    "lockedCurrencySide": "SENDING",
+    "lockedCurrencyAmount": 10000000,
+    "description": "Wallet transfer"
+  }'
+```
+</CodeGroup>
+
 ## Where to next
 
 <CardGroup cols={2}>