Add Arbitrum (ARBITRUM_WALLET) to Grid public API schema

.claude/skills/grid-api/SKILL.md

@@ -294,7 +294,7 @@ Returns:
 - `totalFee` — total cost in withdrawal currency (network fee converted + application fee)
 - `netAmount` — amount recipient receives after all fees
 
-Supported networks: `SOLANA`, `ETHEREUM`, `BASE`, `POLYGON`, `SPARK`, `LIGHTNING`, `BITCOIN`
+Supported networks: `SOLANA`, `ETHEREUM`, `BASE`, `POLYGON`, `ARBITRUM`, `SPARK`, `LIGHTNING`, `BITCOIN`
 
 ### Quotes (Cross-Currency Transfers)
 
@@ -567,7 +567,7 @@ Use this flow when the user asks for a "realtime quote" or "just in time" funded
 
 **Compatible instant methods:**
 
-- **Crypto:** BTC (Lightning, Spark), USDC (Solana, Base, Polygon, Ethereum), USDT (Tron, Ethereum, Plasma)
+- **Crypto:** BTC (Lightning, Spark), USDC (Solana, Base, Polygon, Ethereum, Arbitrum), USDT (Tron, Ethereum, Plasma, Arbitrum)
 - **Fiat:** RTP, SEPA Instant, and other instant payment rails
 
 **Flow:**

.claude/skills/grid-api/references/account-types.md

@@ -57,6 +57,7 @@ The **Available Rails** column lists the payment rails Grid may use for the crea
 | SOLANA_WALLET | USDC | Solana wallet address |
 | TRON_WALLET | USDT | TRON wallet address |
 | PLASMA_WALLET | USDT | Plasma wallet address (0x...) |
+| ARBITRUM_WALLET | USDC, USDT | Arbitrum wallet address (0x...) |
 | POLYGON_WALLET | USDC | Polygon wallet address (0x...) |
 | BASE_WALLET | USDC | Base wallet address (0x...) |
 

.stainless/stainless.yml

@@ -203,6 +203,7 @@ resources:
           solana_wallet_info: '#/components/schemas/SolanaWalletExternalAccountInfo'
           tron_wallet_info: '#/components/schemas/TronWalletExternalAccountInfo'
           plasma_wallet_info: '#/components/schemas/PlasmaWalletExternalAccountInfo'
+          arbitrum_wallet_info: '#/components/schemas/ArbitrumWalletExternalAccountInfo'
           polygon_wallet_info: '#/components/schemas/PolygonWalletExternalAccountInfo'
           lightning_wallet_info: '#/components/schemas/LightningExternalAccountInfo'
           base_wallet_info: '#/components/schemas/BaseWalletExternalAccountInfo'
@@ -893,6 +894,7 @@ openapi:
           - "$.components.schemas.PaymentSolanaWalletInfo.allOf[0]"
           - "$.components.schemas.PaymentTronWalletInfo.allOf[0]"
           - "$.components.schemas.PaymentPlasmaWalletInfo.allOf[0]"
+          - "$.components.schemas.PaymentArbitrumWalletInfo.allOf[0]"
           - "$.components.schemas.PaymentPolygonWalletInfo.allOf[0]"
           - "$.components.schemas.PaymentBaseWalletInfo.allOf[0]"
           - "$.components.schemas.PaymentEthereumWalletInfo.allOf[0]"
@@ -947,6 +949,7 @@ openapi:
           - "$.components.schemas.SolanaWalletExternalAccountInfo.allOf[0]"
           - "$.components.schemas.TronWalletExternalAccountInfo.allOf[0]"
           - "$.components.schemas.PlasmaWalletExternalAccountInfo.allOf[0]"
+          - "$.components.schemas.ArbitrumWalletExternalAccountInfo.allOf[0]"
           - "$.components.schemas.PolygonWalletExternalAccountInfo.allOf[0]"
           - "$.components.schemas.BaseWalletExternalAccountInfo.allOf[0]"
         keys: [ "$ref" ]

components/grid-visualizer/src/data/account-types.ts

@@ -271,6 +271,13 @@ export const accountTypeSpecs: Record<string, AccountTypeSpec> = {
     ],
     beneficiaryRequired: false,
   },
+  ARBITRUM_WALLET: {
+    accountType: 'ARBITRUM_WALLET',
+    fields: [
+      { name: 'address', example: '0xAbCDEF1234567890aBCdEf1234567890ABcDef12' },
+    ],
+    beneficiaryRequired: false,
+  },
   AED_ACCOUNT: {
     accountType: 'AED_ACCOUNT',
     fields: [

components/grid-visualizer/src/data/crypto.ts

@@ -34,6 +34,7 @@ export const cryptoAssets: CryptoAsset[] = [
       { type: 'POLYGON_WALLET', label: 'Wallet', network: 'Polygon' },
       { type: 'BASE_WALLET', label: 'Wallet', network: 'Base' },
       { type: 'ETHEREUM_WALLET', label: 'Wallet', network: 'Ethereum' },
+      { type: 'ARBITRUM_WALLET', label: 'Wallet', network: 'Arbitrum' },
     ],
     examplePerson: { fullName: 'Alex Rivera', nationality: 'US' },
   },
@@ -44,6 +45,7 @@ export const cryptoAssets: CryptoAsset[] = [
       { type: 'TRON_WALLET', label: 'Wallet', network: 'Tron' },
       { type: 'ETHEREUM_WALLET', label: 'Wallet', network: 'Ethereum' },
       { type: 'PLASMA_WALLET', label: 'Wallet', network: 'Plasma' },
+      { type: 'ARBITRUM_WALLET', label: 'Wallet', network: 'Arbitrum' },
     ],
     examplePerson: { fullName: 'Sam Chen', nationality: 'US' },
   },

mintlify/snippets/external-accounts.mdx

@@ -1838,6 +1838,38 @@ curl -X POST 'https://api.lightspark.com/grid/2025-10-13/customers/external-acco
     }'
 ```
 
+**Arbitrum**
+
+Supported assets: USDC, USDT.
+
+```bash cURL USDC
+curl -X POST 'https://api.lightspark.com/grid/2025-10-13/customers/external-accounts' \
+  -u "$GRID_CLIENT_ID:$GRID_CLIENT_SECRET" \
+  -H 'Content-Type: application/json' \
+  -d '{
+      "currency": "USDC",
+      "platformAccountId": "arbitrum_usdc_001",
+      "accountInfo": {
+        "accountType": "ARBITRUM_WALLET",
+        "address": "0xAbCDEF1234567890aBCdEf1234567890ABcDef12"
+      }
+    }'
+```
+
+```bash cURL USDT
+curl -X POST 'https://api.lightspark.com/grid/2025-10-13/customers/external-accounts' \
+  -u "$GRID_CLIENT_ID:$GRID_CLIENT_SECRET" \
+  -H 'Content-Type: application/json' \
+  -d '{
+      "currency": "USDT",
+      "platformAccountId": "arbitrum_usdt_001",
+      "accountInfo": {
+        "accountType": "ARBITRUM_WALLET",
+        "address": "0xAbCDEF1234567890aBCdEf1234567890ABcDef12"
+      }
+    }'
+```
+
 **Lightning**
 
 Exactly one of `lightningAddress`, `invoice` (a single-use BOLT11 invoice) or `bolt12`
@@ -1858,8 +1890,8 @@ curl -X POST 'https://api.lightspark.com/grid/2025-10-13/customers/external-acco
 ```
 <Note>
   Crypto wallets don't require beneficiary information. Send only assets on the
-  named network — EVM addresses look identical across Ethereum, Base, Polygon and
-  Plasma, and funds sent on the wrong network are unrecoverable.
+  named network — EVM addresses look identical across Ethereum, Base, Polygon,
+  Plasma, and Arbitrum, and funds sent on the wrong network are unrecoverable.
 </Note>
 </Tab>
 </Tabs>

mintlify/snippets/internal-accounts.mdx

@@ -249,6 +249,20 @@ Each internal account includes `fundingPaymentInstructions` that tell your custo
     ```
   </Accordion>
 
+  <Accordion title="Arbitrum Stablecoin Funding">
+    For Arbitrum wallet accounts, using an Arbitrum wallet as the funding source (USDC or USDT):
+
+    ```json
+    {
+      "accountOrWalletInfo": {
+        "accountType": "ARBITRUM_WALLET",
+        "assetType": "USDC",
+        "address": "0xAbCDEF1234567890aBCdEf1234567890ABcDef12"
+      }
+    }
+    ```
+  </Accordion>
+
   <Accordion title="Polygon Stablecoin Funding">
     For Polygon wallet accounts, using a Polygon wallet as the funding source:
 

mintlify/snippets/sending/crypto-funding.mdx

@@ -11,6 +11,8 @@ Transfers can be funded via USDC and BTC on popular blockchains including Solana
 | Tron | USDT |
 | Polygon | USDC |
 | Ethereum | USDC, USDT |
+| Plasma | USDT |
+| Arbitrum | USDC, USDT |
 | Lightning | BTC |
 | Spark | BTC |