diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9af27799..080fb2b8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -68,6 +68,10 @@ doesn't describe endpoints the released server lacks.
 - `CONTRIBUTING.md`, expanded `.env.example`, and per-component READMEs.
 
 ### Fixed
+- `POST /new_account` no longer intermittently returns a 500
+  (`NoAccountAccess`) when the RPC provider serves the follow-up wallet
+  registration's dry-run from a node that hasn't executed the just-mined
+  `newAccount` block; the propagation window is now retried with backoff.
 - Release builds no longer report a spurious `-modified` version suffix
   (`.dockerignore` excluded a tracked file, dirtying `git describe` inside the
   image build).
diff --git a/k6/correctness/integration.spec.ts b/k6/correctness/integration.spec.ts
index 91b0010f..c70296f1 100644
--- a/k6/correctness/integration.spec.ts
+++ b/k6/correctness/integration.spec.ts
@@ -6,6 +6,7 @@
  *   k6 run k6/integration.spec.ts
  *   BASE_URL=https://your-instance.phala.network/core/v1 k6 run k6/integration.spec.ts
  */
+import { sleep } from "k6";
 import { checkAndLog, warnOnHttpFailures } from "../helpers.ts";
 import { LitApiServerClient } from "../litApiServer.ts";
 import { PRECREATED_ACCOUNTS } from "../setup.ts";
@@ -206,10 +207,41 @@ export default function (data: IntegrationSetupData) {
   }, "addActionToGroup");
 
   // ── 10a. listActions (account-level, no group_id) ────────────────────────
-  const listActionsAccountRes = client.listActions(
+  // The action metadata + group membership were written on-chain moments ago;
+  // list reads can briefly lag the write (the RPC can serve the read from a
+  // node that hasn't executed those blocks yet). Poll until the action is
+  // visible with a real id so propagation lag doesn't fail the deploy gate —
+  // a genuinely missing action still fails the checks after the retries, and
+  // a stale group listing would otherwise send hash 0x0 to
+  // update_action_metadata below.
+  const LIST_ACTIONS_ATTEMPTS = 5;
+  const findHelloWorld = (body: unknown): { id: string; name: string } | undefined => {
+    try {
+      const items = JSON.parse(body as string) as { id: string; name: string }[];
+      const item = Array.isArray(items) ? items.find((a) => a.name === "hello-world") : undefined;
+      // An all-zero id means the membership row landed but the metadata read
+      // is still stale — treat as not-yet-visible and keep polling.
+      return item && item.id && !/^(0x)?0*$/.test(item.id) ? item : undefined;
+    } catch {
+      return undefined;
+    }
+  };
+
+  let listActionsAccountRes = client.listActions(
     { page_number: 0, page_size: 10 },
     authHeaders,
   );
+  for (
+    let i = 1;
+    i < LIST_ACTIONS_ATTEMPTS && !findHelloWorld(listActionsAccountRes.response.body);
+    i++
+  ) {
+    sleep(2);
+    listActionsAccountRes = client.listActions(
+      { page_number: 0, page_size: 10 },
+      authHeaders,
+    );
+  }
   if (!assertOk("listActionsAccount", "GET /list_actions (account)", listActionsAccountRes)) return;
   checkAndLog(listActionsAccountRes.response, {
     "listActionsAccount returns array": (r) => {
@@ -229,11 +261,22 @@ export default function (data: IntegrationSetupData) {
     },
   }, "listActionsAccount");
 
-  // ── 10b. listActions (in group) ─────────────────────────────────────────
-  const listActionsRes = client.listActions(
+  // ── 10b. listActions (in group) — same propagation-lag polling as 10a ────
+  let listActionsRes = client.listActions(
     { group_id: parseInt(groupId), page_number: 0, page_size: 10 },
     authHeaders,
   );
+  for (
+    let i = 1;
+    i < LIST_ACTIONS_ATTEMPTS && !findHelloWorld(listActionsRes.response.body);
+    i++
+  ) {
+    sleep(2);
+    listActionsRes = client.listActions(
+      { group_id: parseInt(groupId), page_number: 0, page_size: 10 },
+      authHeaders,
+    );
+  }
   if (!assertOk("listActions", "GET /list_actions", listActionsRes)) return;
   checkAndLog(listActionsRes.response, {
     "listActions returns array": (r) => {
@@ -244,8 +287,14 @@ export default function (data: IntegrationSetupData) {
       }
     },
   }, "listActions");
-  const listActionsBody = JSON.parse(listActionsRes.response.body as string) as { id: string; name: string }[];
-  const actionItem = listActionsBody.find((a) => a.name === "hello-world");
+  const actionItem = findHelloWorld(listActionsRes.response.body);
+  if (
+    !checkAndLog(listActionsRes.response, {
+      "listActions group contains added action with non-zero id": () => actionItem !== undefined,
+    }, "listActions")
+  ) {
+    return;
+  }
   const hashedCid = actionItem?.id ?? "";
   // ── 10. addPkpToGroup ─────────────────────────────────────────────────────
   const addPkpRes = client.addPkpToGroup(
diff --git a/lit-api-server/src/core/account_management.rs b/lit-api-server/src/core/account_management.rs
index 94015ed6..9c8ecf64 100644
--- a/lit-api-server/src/core/account_management.rs
+++ b/lit-api-server/src/core/account_management.rs
@@ -42,6 +42,11 @@ use rocket::serde::json::Json;
 /// to include the NotAllowedTo* error types. Track as follow-up.
 const PERMISSION_ERROR_PATTERNS: &[&str] = &["NotAllowedTo", "NotMasterAccount", "NoAccountAccess"];
 
+/// Attempts for the registerWalletDerivation follow-up write inside `new_account`
+/// (1 initial + 3 retries, exponential backoff from 250ms). Only the stale-read
+/// NoAccountAccess revert is retried — see the comment at the call site.
+const REGISTER_WALLET_DERIVATION_ATTEMPTS: u32 = 4;
+
 fn map_contract_error(e: anyhow::Error, context: &str) -> ApiStatus {
     let msg = format!("{}", e);
     if PERMISSION_ERROR_PATTERNS
@@ -125,15 +130,42 @@ pub async fn new_account(
     }
 
     // technically this is NOT a derivaton path at all, but it's a stand-in for now
-    accounts::register_wallet_derivation(
-        signer_pool,
-        &api_key,
-        wallet_address,
-        derivation_path,
-        "AMW",
-        "Account Master Wallet",
-    )
-    .await?;
+    //
+    // The newAccount receipt above proves the account exists on-chain, but
+    // send_transaction dry-runs this follow-up write via eth_call, and the RPC
+    // provider can serve that call from a node that hasn't executed the
+    // newAccount block yet — reverting NoAccountAccess for an account that was
+    // just mined. That stale-read window is the only way NoAccountAccess can
+    // occur here, so retry it briefly; any other error fails immediately.
+    let mut attempt = 0u32;
+    loop {
+        attempt += 1;
+        match accounts::register_wallet_derivation(
+            signer_pool.clone(),
+            &api_key,
+            wallet_address,
+            derivation_path,
+            "AMW",
+            "Account Master Wallet",
+        )
+        .await
+        {
+            Ok(_) => break,
+            Err(e)
+                if attempt < REGISTER_WALLET_DERIVATION_ATTEMPTS
+                    && e.to_string().contains("NoAccountAccess") =>
+            {
+                let backoff_ms = 250u64 << (attempt - 1);
+                tracing::warn!(
+                    "new_account: registerWalletDerivation simulation hit stale-read \
+                     NoAccountAccess (attempt {attempt}/{REGISTER_WALLET_DERIVATION_ATTEMPTS}); \
+                     retrying in {backoff_ms}ms"
+                );
+                tokio::time::sleep(std::time::Duration::from_millis(backoff_ms)).await;
+            }
+            Err(e) => return Err(e.into()),
+        }
+    }
 
     // Best-effort: eagerly create the Stripe customer (with $0 balance), set the email
     // if provided, and grant starter credits when STARTER_CREDITS_CENTS is configured.