feat: add x402_fetch tool

package.json

@@ -22,6 +22,7 @@
     "@injectivelabs/networks": "^1.14.27",
     "@injectivelabs/sdk-ts": "^1.14.27",
     "@injectivelabs/utils": "^1.14.27",
+    "@injectivelabs/x402": "^0.0.1",
     "@modelcontextprotocol/sdk": "^1.0.4",
     "decimal.js": "^10.4.3",
     "zod": "^3.22.0"

src/mcp/server.ts

@@ -25,6 +25,7 @@ import { debridge } from '../bridges/debridge.js'
 import { evm } from '../evm/index.js'
 import { eip712 } from '../evm/eip712.js'
 import { authz, TRADING_MSG_TYPES } from '../authz/index.js'
+import { createInjectiveClient } from '@injectivelabs/x402/client'
 
 const injAddress = z.string().regex(/^inj1[a-z0-9]{38}$/, 'Must be a valid inj1... address (42 chars)')
 const numericString = z.string().regex(/^\d+(\.\d+)?$/, 'Must be a positive numeric string')
@@ -809,6 +810,44 @@ server.tool(
   },
 )
 
+// ─── x402 Payment Tools ────────────────────────────────────────────────────────
+
+server.tool(
+  'x402_fetch',
+  'Fetch data from an x402-gated API endpoint. Automatically handles 402 Payment Required ' +
+  'responses by signing a USDC payment using the Injective EVM wallet, submitting it to the facilitator, ' +
+  'and retrying the request. IMPORTANT: Real on-chain payment with real funds.',
+  {
+    address: injAddress.describe('The inj1... address of your trading wallet.'),
+    password: z.string().describe('Keystore password to decrypt the private key for signing.'),
+    url: z.string().url().describe('The URL of the x402-gated API endpoint.'),
+  },
+  async ({ address, password, url }) => {
+    const privateKeyHex = wallets.unlock(address, password)
+    const client = createInjectiveClient({ privateKey: privateKeyHex as `0x${string}` })
+    const response = await client.fetch(url)
+
+    const text = await response.text()
+    let data;
+    try {
+      data = JSON.parse(text)
+    } catch {
+      data = text
+    }
+
+    return {
+      content: [{
+        type: 'text',
+        text: JSON.stringify({
+          status: response.status,
+          url: response.url,
+          data
+        }, null, 2),
+      }],
+    }
+  },
+)
+
 // ─── Start ───────────────────────────────────────────────────────────────────
 
 const transport = new StdioServerTransport()