diff --git a/docs/agents/agentic-transactions.page.tsx b/docs/agents/agentic-transactions.page.tsx
index 9a4d41cbc7..c9b51fd647 100644
--- a/docs/agents/agentic-transactions.page.tsx
+++ b/docs/agents/agentic-transactions.page.tsx
@@ -236,6 +236,11 @@ export default function AgenticTransactions() {
           color: #7c1fff;
         }
 
+        /* Agentic payment loop diagram — swap to dark SVG in dark mode */
+        html:not(.light) .agentic-loop-diagram {
+          content: url(${require('../../static/img/xrpl-agentic-payment-loop.svg')});
+        }
+
         /* Benefit cards: 3-col grid */
         .benefit-card-grid {
           display: grid;
@@ -340,18 +345,11 @@ export default function AgenticTransactions() {
           )}
         </p>
 
-        {/* Dark/light diagram variants */}
-        <picture>
-          <source
-            srcSet={require('../../static/img/xrpl-agentic-payment-loop.svg')}
-            media="(prefers-color-scheme: dark)"
-          />
-          <img
-            src={require('../../static/img/xrpl-agentic-payment-loop-light.svg')}
-            alt="The Agentic Payment Loop: five steps — Trigger, Decision, Transaction, XRP Ledger Validation (tesSUCCESS or clean expiry), and Logging."
-            className="mw-100"
-          />
-        </picture>
+        <img
+          src={require('../../static/img/xrpl-agentic-payment-loop-light.svg')}
+          alt="The Agentic Payment Loop: five steps — Trigger, Decision, Transaction, XRP Ledger Validation (tesSUCCESS or clean expiry), and Logging."
+          className="mw-100 agentic-loop-diagram"
+        />
       </section>
 
       {/* ── SEE IT FIRST ─────────────────────────────────────────────────── */}
diff --git a/docs/img/x402-sequence-light.svg b/docs/img/x402-sequence-light.svg
index 4c4f927242..d2e453de57 100644
--- a/docs/img/x402-sequence-light.svg
+++ b/docs/img/x402-sequence-light.svg
@@ -67,12 +67,13 @@
   <text x="917" y="630" text-anchor="middle" fill="#5A6888" font-size="7">200 OK</text>
 
   <!-- ════════════════════════════════════════════════════
-       STEP 1 — Agent → Merchant: GET /hello
+       STEP 1 — Agent → Merchant: GET /hello + X-PAYMENT header
   ═════════════════════════════════════════════════════ -->
-  <text x="194" y="128" text-anchor="middle" fill="#0076A8" font-size="10.5" font-weight="600">GET /hello</text>
-  <line x1="92" y1="140" x2="295" y2="140" stroke="#0094C4" stroke-width="1.5" marker-end="url(#ab)"/>
-  <circle cx="32" cy="140" r="8" fill="#EDF6FC" stroke="#0094C4" stroke-width="1"/>
-  <text x="32" y="144" text-anchor="middle" fill="#0076A8" font-size="8" font-weight="700">1</text>
+  <text x="194" y="125" text-anchor="middle" fill="#0076A8" font-size="10.5" font-weight="600">GET /hello  +  X-PAYMENT header</text>
+  <line x1="92" y1="137" x2="295" y2="137" stroke="#0094C4" stroke-width="1.5" marker-end="url(#ab)"/>
+  <text x="194" y="151" text-anchor="middle" fill="#4A8AAE" font-size="9">X-PAYMENT: — (no prior payment)</text>
+  <circle cx="32" cy="137" r="8" fill="#EDF6FC" stroke="#0094C4" stroke-width="1"/>
+  <text x="32" y="141" text-anchor="middle" fill="#0076A8" font-size="8" font-weight="700">1</text>
 
   <!-- ════════════════════════════════════════════════════
        STEP 2 — Merchant → Agent: 402 Payment Required
@@ -88,7 +89,7 @@
   ═════════════════════════════════════════════════════ -->
   <text x="316" y="242" text-anchor="middle" fill="#16A34A" font-size="10.5" font-weight="700">Payment Transaction</text>
   <line x1="92" y1="254" x2="539" y2="254" stroke="#16A34A" stroke-width="2" marker-end="url(#ag)"/>
-  <text x="316" y="268" text-anchor="middle" fill="#3A8058" font-size="9">amount: 1000 drops · destination: payTo</text>
+  <text x="316" y="268" text-anchor="middle" fill="#3A8058" font-size="9">amount: 1000 drops · destination: payTo · Memo: { requestId, payTo }</text>
   <circle cx="32" cy="254" r="8" fill="#F0FDF4" stroke="#16A34A" stroke-width="1"/>
   <text x="32" y="258" text-anchor="middle" fill="#16A34A" font-size="8" font-weight="700">3</text>