Logging which faciliator was used

src/lib/x402/facilitator-client-factory.js

@@ -1,6 +1,23 @@
 import { HTTPFacilitatorClient } from '@x402/core/server'
 import { RoundRobinFacilitatorClient } from './round-robin-facilitator-client.js'
 
+function withSettleLogging (entry) {
+  return {
+    async getSupported () {
+      return entry.client.getSupported()
+    },
+    async verify (paymentPayload, paymentRequirements) {
+      return entry.client.verify(paymentPayload, paymentRequirements)
+    },
+    async settle (paymentPayload, paymentRequirements) {
+      const result = await entry.client.settle(paymentPayload, paymentRequirements)
+      const tx = result?.transaction || 'n/a'
+      console.log(`[x402] payment settled via ${entry.name || entry.key || 'facilitator'} (${entry.url || 'no-url'}) tx=${tx}`)
+      return result
+    }
+  }
+}
+
 export function createFacilitatorClient (connectionOpts = [], createAuthHeaders, ClientClass = HTTPFacilitatorClient) {
   const entries = connectionOpts.map(o => ({
     key: o.key,
@@ -18,7 +35,7 @@ export function createFacilitatorClient (connectionOpts = [], createAuthHeaders,
 
   if (entries.length === 1) {
     return {
-      client: entries[0].client,
+      client: withSettleLogging(entries[0]),
       strategy: 'single'
     }
   }

src/lib/x402/round-robin-facilitator-client.js

@@ -82,6 +82,8 @@ export class RoundRobinFacilitatorClient {
       try {
         const result = await entry.client.settle(paymentPayload, paymentRequirements)
         this.cursorByKey.set(key, (idx + 1) % length)
+        const tx = result?.transaction || 'n/a'
+        console.log(`[x402] payment settled via ${entry.name || entry.key || `facilitator-${idx}`} (${entry.url || 'no-url'}) tx=${tx}`)
         return result
       } catch (err) {
         attempts.push({

test/unit/lib/x402/facilitator-client-factory-unit.js

@@ -17,8 +17,9 @@ describe('#facilitator-client-factory', () => {
     const result = createFacilitatorClient(connectionOpts, async () => ({}), FakeFacilitatorClient)
 
     assert.equal(result.strategy, 'single')
-    assert.instanceOf(result.client, FakeFacilitatorClient)
+    assert.isFunction(result.client.verify)
-    assert.equal(result.client.opts.url, 'https://cdp.example.com')
+    assert.isFunction(result.client.settle)
+    assert.isFunction(result.client.getSupported)
   })
 
   it('returns round-robin strategy when multiple facilitators are configured', () => {