feat(x402): Added x402 Base blockchain support

examples/08-x402-client.js

@@ -0,0 +1,55 @@
+import axios from 'axios'
+import { withPaymentInterceptor } from 'x402-axios'
+import { mnemonicToAccount } from 'viem/accounts'
+import { baseSepolia } from 'viem/chains'
+import { createWalletClient, http } from 'viem'
+
+const baseURL = 'http://localhost:5942'
+const endpointPath = '/v6/full-node/blockchain/getBlockchainInfo'
+const mnemonic = process.env.MNEMONIC || ''
+
+if (!mnemonic) throw new Error('MNEMONIC env required!')
+
+// Create a wallet client
+const account = mnemonicToAccount(mnemonic)
+const client = createWalletClient({
+  account,
+  transport: http(),
+  chain: baseSepolia
+})
+
+const api = withPaymentInterceptor(
+  axios.create({
+    baseURL
+  }),
+  client
+)
+
+const request = async () => {
+  console.log('\n\nStep 1: Making first call, expecting a 402 error returned.')
+  try {
+    const response = await axios.get(baseURL + endpointPath)
+    console.log(response.data)
+    console.log('Step 1 failed. Expected a 402 error.')
+  } catch (err) {
+    console.log(`Status code: ${err?.response?.status}`)
+    console.log(`Error data: ${JSON.stringify(err.response.data, null, 2)}`)
+    console.log('\n\n')
+  }
+
+  console.log('\n\nStep 2: Making second call with a payment.')
+
+  try {
+    // Call the same endpoint path with a payment.
+    const paidRes = await api.get(endpointPath)
+    console.log('Data returned after payment: ', paidRes.data)
+  } catch (err) {
+    console.log('Step 2 failed. Expected a 200 success status code.')
+    console.log(`Status code: ${err?.response?.status}`)
+    console.log(`Error data: ${JSON.stringify(err.response.data, null, 2)}`)
+
+    process.exit(1)
+  }
+}
+
+request()