diff --git a/09 - Audits/Activity Log.md b/09 - Audits/Activity Log.md
index 3bf55bd..fc282a7 100644
--- a/09 - Audits/Activity Log.md	
+++ b/09 - Audits/Activity Log.md	
@@ -11,6 +11,16 @@ entries on top. Maintained by agents per the rule in `../AGENTS.md`.
 
 ---
 
+### 2026-06-06 — backend@ca2b1c4, frontend@aac3304 — Marketplace E2E notification smoke runner
+
+**Commits:** `ca2b1c4` `aac3304`
+**Touched:** backend `scripts/smoke/marketplace-e2e-notifications.mjs`, `scripts/smoke/marketplace-e2e-notifications.sh`, `package.json`, `package-lock.json`; frontend `package.json`, `Dockerfile`; docs `11 - Testing/Marketplace E2E Smoke Runner.md`, testing procedure pages.
+**Why:** Implement the requested buyer/seller marketplace E2E runner with at least two sellers, notification assertions after every state-changing step, report generation, concurrency ramp controls, and BSC Testnet live-payment support. Rebased on newer Forgejo `main` and bumped backend/frontend to `2.9.2`.
+**Verification:** backend `node --check scripts/smoke/marketplace-e2e-notifications.mjs`, `npm run typecheck`, `git diff --check`; frontend `git diff --check` and version/Dockerfile sanity; nick-doc `git diff --check`. Dev two-round `PAYMENT_MODE=record` report exposed HTTP 500 on legacy `POST /api/marketplace/payments` and missing selected-seller accepted notification. Direct-backend one-round `PAYMENT_MODE=status` reached final request status `delivered` with notification gaps recorded. Woodpecker build pending after push.
+**Linked docs updated:** [[11 - Testing/Marketplace E2E Smoke Runner]], [[11 - Testing/Escrow Marketplace E2E Procedure]], [[11 - Testing/Smoke and Regression Procedure]], [[11 - Testing/Concurrency and Performance Profile]], [[11 - Testing/Testing Expansion Backlog]]
+
+---
+
 ### 2026-06-06 — backend@31b285f, frontend@2a3e5c9 — BSC Testnet checkout UI support
 
 **Commits:** `31b285f` `2a3e5c9`
diff --git a/11 - Testing/Concurrency and Performance Profile.md b/11 - Testing/Concurrency and Performance Profile.md
index b09f2e6..74b3339 100644
--- a/11 - Testing/Concurrency and Performance Profile.md	
+++ b/11 - Testing/Concurrency and Performance Profile.md	
@@ -36,6 +36,21 @@ Each worker must use unique:
 Notifications are mandatory inside every worker. See
 [[Notification Assertion Procedure]].
 
+Implemented runner:
+
+```bash
+cd ~/CascadeProjects/escrow/backend
+BASE_URL=https://dev.amn.gg \
+PAYMENT_MODE=status \
+CONCURRENCY_LEVELS=1,2,4,8,16,32 \
+ROUNDS=1 \
+bash scripts/smoke/marketplace-e2e-notifications.sh
+```
+
+Use `PAYMENT_MODE=live` for low-concurrency BSC Testnet tUSDT confirmation.
+Use `PAYMENT_MODE=status` for high-concurrency marketplace/notification
+profiling without consuming gas.
+
 ## Ramp Plan
 
 Start with one simultaneous worker and double until a stop condition is reached:
@@ -59,6 +74,7 @@ stage.
 | Mode | Payment behavior | Use |
 |---|---|---|
 | Live-chain mode | Real BSC Testnet tUSDT transfers | Final confidence at low concurrency; expensive/slower; consumes gas. |
+| Status-only smoke mode | Moves accepted request to `payment` through the status route | Implemented high-concurrency marketplace/notification profiling without chain variables. |
 | Scanner fixture mode | Deterministic scanner/balance fixture or controlled test endpoint | High concurrency without chain bottleneck. Must not be enabled in production. |
 | API-only dry run | Runs request/offer/delivery and skips payment finalization | Marketplace/notification profiling without chain variables. |
 
@@ -267,4 +283,3 @@ These are the expectations to validate:
 - Scanner live-chain checks are likely bounded by BSC Testnet RPC latency and should be separated from API-only profiling.
 - Payment intent creation may become slower if destination derivation, token registry lookup, and scanner registration are serial.
 - Socket fanout should be watched at C16+ because each worker has multiple actors and multiple tabs/devices may multiply room membership.
-
diff --git a/11 - Testing/Escrow Marketplace E2E Procedure.md b/11 - Testing/Escrow Marketplace E2E Procedure.md
index 375c4b2..4275309 100644
--- a/11 - Testing/Escrow Marketplace E2E Procedure.md	
+++ b/11 - Testing/Escrow Marketplace E2E Procedure.md	
@@ -30,6 +30,20 @@ or scanner changes.
 
 ## High-Level Procedure
 
+Use the implemented backend runner for repeatable execution:
+
+```bash
+BASE_URL=https://dev.amn.gg \
+PAYMENT_MODE=status \
+CONCURRENCY_LEVELS=1 \
+ROUNDS=2 \
+bash scripts/smoke/marketplace-e2e-notifications.sh
+```
+
+Use `PAYMENT_MODE=live` for the funded BSC Testnet tUSDT rail and
+`PAYMENT_MODE=record` only when explicitly testing the legacy marketplace
+payment-record route. See [[Marketplace E2E Smoke Runner]].
+
 1. Generate a run id.
 2. Admin creates one buyer and at least two sellers.
 3. Assert initial notification baselines for buyer and sellers.
diff --git a/11 - Testing/Marketplace E2E Smoke Runner.md b/11 - Testing/Marketplace E2E Smoke Runner.md
new file mode 100644
index 0000000..5501c71
--- /dev/null
+++ b/11 - Testing/Marketplace E2E Smoke Runner.md	
@@ -0,0 +1,185 @@
+---
+title: Marketplace E2E Smoke Runner
+tags: [testing, smoke, e2e, notifications, performance]
+created: 2026-06-06
+---
+
+# Marketplace E2E Smoke Runner
+
+The backend repo has a committed marketplace runner:
+
+```bash
+backend/scripts/smoke/marketplace-e2e-notifications.sh
+```
+
+It creates isolated test actors, runs buyer/seller marketplace flows, checks
+persisted notifications after every business mutation, and writes JSON/Markdown
+reports under ignored `backend/tmp/e2e-reports/`.
+
+## Required Environment
+
+Do not put secrets in command history or docs. Load these from an ignored local
+env file or a secure shell session:
+
+| Variable | Purpose |
+|---|---|
+| `BASE_URL` | Target API, for example `https://dev.amn.gg`. Defaults to local `http://127.0.0.1:5001`. |
+| `ADMIN_EMAIL` | Admin account email used only to create test users. |
+| `ADMIN_PASSWORD` | Admin account password, never committed or printed. |
+| `PAYMENT_MODE` | `status`, `record`, or `live`. Defaults to `status`. |
+| `CONCURRENCY_LEVELS` | Comma-separated worker ramp, for example `1,2,4,8`. |
+| `ROUNDS` | Rounds per worker. Use `2` for the basic two-round requirement. |
+| `SELLERS_PER_WORKER` | Sellers per flow. Minimum enforced by runner is `2`; default is `3`. |
+| `SKIP_WRONG_RECIPIENT_CHECK` | Optional escape hatch for rate-limited environments. Defaults to `false`. |
+
+## Payment Modes
+
+| Mode | Use | Notes |
+|---|---|---|
+| `status` | Cheap full-flow smoke without wallet funds. | Moves the request to `payment` through the status route, then exercises seller delivery and buyer confirmation. |
+| `record` | Tests legacy `POST /api/marketplace/payments`. | Current dev run shows this route returns HTTP 500 with generated buyer/seller ids. Keep this mode for regression coverage. |
+| `live` | Tests BSC Testnet tUSDT direct-balance scanner rail. | Requires `E2E_PAYMENT_PRIVATE_KEY` or `E2E_PAYMENT_MNEMONIC`, gas, and tUSDT. Sends ERC-20 transfer and calls direct-balance check. |
+
+Live mode also reads:
+
+| Variable | Default |
+|---|---|
+| `E2E_NETWORK` | `bsc-testnet` |
+| `E2E_CHAIN_ID` | `97` |
+| `E2E_TOKEN_SYMBOL` | `USDT` |
+| `RPC_URL_CHAIN_97` / `BSC_TESTNET_RPC_URL` | public BSC Testnet RPC fallback |
+
+## Example Commands
+
+Two-round full-flow smoke without wallet funds:
+
+```bash
+BASE_URL=https://dev.amn.gg \
+PAYMENT_MODE=status \
+CONCURRENCY_LEVELS=1 \
+ROUNDS=2 \
+bash scripts/smoke/marketplace-e2e-notifications.sh
+```
+
+Concurrency profile starting at one worker:
+
+```bash
+BASE_URL=https://dev.amn.gg \
+PAYMENT_MODE=status \
+CONCURRENCY_LEVELS=1,2,4,8,16,32 \
+ROUNDS=1 \
+bash scripts/smoke/marketplace-e2e-notifications.sh
+```
+
+Live BSC Testnet tUSDT smoke:
+
+```bash
+BASE_URL=https://dev.amn.gg \
+PAYMENT_MODE=live \
+CONCURRENCY_LEVELS=1 \
+ROUNDS=1 \
+bash scripts/smoke/marketplace-e2e-notifications.sh
+```
+
+## Notification Behavior
+
+The runner treats each state-changing business step as a notification checkpoint.
+Each checkpoint records:
+
+- actor and role;
+- expected related id;
+- whether a persisted notification was found;
+- whether the missing notification is a known gap;
+- unread count from the notification list response.
+
+By default, known gaps do not abort the flow. Set `STRICT_NOTIFICATIONS=true`
+to make known gaps fail the run. Set `ABORT_ON_NOTIFICATION_FAILURE=true` to
+stop at the first missing notification.
+
+## Output
+
+Reports are ignored by Git:
+
+```text
+backend/tmp/e2e-reports/marketplace-e2e-<runId>.json
+backend/tmp/e2e-reports/marketplace-e2e-<runId>.md
+```
+
+The report includes:
+
+- flow pass/fail counts;
+- notification found/missing/known-gap counts;
+- wrong-recipient notification count;
+- API p50/p95/p99/max timings;
+- request, offer, payment, token, and transaction ids where applicable.
+
+Actor tokens and admin credentials are never written to the report.
+
+## Reference Dev Run - 2026-06-06
+
+Command shape:
+
+```bash
+BASE_URL=https://dev.amn.gg PAYMENT_MODE=record CONCURRENCY_LEVELS=1 ROUNDS=2 ...
+```
+
+Result:
+
+| Metric | Value |
+|---|---:|
+| flows passed | `0/2` |
+| request-created notifications found | `8/8` |
+| buyer new-offer notifications found | `6/6` |
+| rejected-seller notifications found | `4/4` |
+| selected-seller accepted notifications by related id | `0/2` |
+| wrong-recipient notifications | `0` |
+| legacy marketplace payment records | `0/2`, HTTP 500 |
+
+Observed defects:
+
+1. Selected-seller accepted notification is not discoverable by the selected
+   offer `relatedId`. The service path appears to create the accepted-offer
+   notification with an incomplete related id.
+2. `POST /api/marketplace/payments` returned HTTP 500 after offer selection
+   with generated test actors. This blocks `PAYMENT_MODE=record`; use
+   `PAYMENT_MODE=status` for flow-only smoke or `PAYMENT_MODE=live` for scanner
+   verification.
+3. Dev API rate limiting is `100` requests per `900s`; concurrency runs must
+   use a fresh window or a non-rate-limited test environment.
+
+## Reference Direct-Backend Run - 2026-06-06
+
+Command shape:
+
+```bash
+BASE_URL=http://127.0.0.1:15001 PAYMENT_MODE=status CONCURRENCY_LEVELS=1 ROUNDS=1 ...
+```
+
+This used a temporary SSH tunnel to the dev backend container to avoid the
+public edge rate-limit window.
+
+Result:
+
+| Metric | Value |
+|---|---:|
+| flows passed | `1/1` |
+| final request status | `delivered` |
+| wrong-recipient notifications | `0` |
+| required notification missing | `1` |
+| known notification gaps | `2` |
+
+Key ids:
+
+| Field | Value |
+|---|---|
+| purchaseRequestId | `dc6ec076-9c15-46a1-ab6b-1d9d17604614` |
+| selectedOfferId | `9f56dd00-8b08-4c9f-b91c-5875e1949113` |
+
+Observed notification result:
+
+- request-created notifications passed for buyer and three targeted sellers;
+- buyer new-offer notifications passed for all three seller bids;
+- rejected-seller notifications passed;
+- selected-seller accepted notification still failed by selected offer `relatedId`;
+- payment-confirmed notification was found in `PAYMENT_MODE=status`;
+- seller delivery and buyer delivery confirmation notifications are known gaps.
diff --git a/11 - Testing/Smoke and Regression Procedure.md b/11 - Testing/Smoke and Regression Procedure.md
index 327161a..4cfcda1 100644
--- a/11 - Testing/Smoke and Regression Procedure.md	
+++ b/11 - Testing/Smoke and Regression Procedure.md	
@@ -39,6 +39,7 @@ Current scripts:
 | `bsc-testnet-payment-registry.sh` | Chain 97 token/RPC registry sanity. |
 | `confirmation-thresholds.sh` | Confirmation threshold APIs/settings. |
 | `funds-ledger-repo.sh` | Funds ledger repository behavior. |
+| `marketplace-e2e-notifications.sh` | Buyer/seller E2E smoke with notification assertions, concurrency levels, and reports. |
 | `marketplace-request-budget.sh` | Purchase request budget validation. |
 | `rn-intent.sh` | Request Network / in-house intent creation smoke. |
 | `rn-webhook.sh` | Webhook shape/signature flow. |
@@ -52,6 +53,21 @@ cd ~/CascadeProjects/escrow/backend
 BASE_URL=https://dev.amn.gg bash scripts/smoke/bsc-testnet-payment-registry.sh
 ```
 
+Two-round marketplace smoke:
+
+```bash
+cd ~/CascadeProjects/escrow/backend
+BASE_URL=https://dev.amn.gg \
+PAYMENT_MODE=status \
+CONCURRENCY_LEVELS=1 \
+ROUNDS=2 \
+bash scripts/smoke/marketplace-e2e-notifications.sh
+```
+
+Use `PAYMENT_MODE=live` when the BSC Testnet wallet has gas and canonical
+tUSDT. The runner writes reports to ignored `backend/tmp/e2e-reports/`; see
+[[Marketplace E2E Smoke Runner]].
+
 Run against local:
 
 ```bash
@@ -165,4 +181,3 @@ Stop or roll back if any P0 condition fails:
 - backend/frontend/scanner registry mismatch exists;
 - CI deploy reports success but live containers are not healthy;
 - secrets appear in git status, logs, docs, or CI output.
-
diff --git a/11 - Testing/Testing Expansion Backlog.md b/11 - Testing/Testing Expansion Backlog.md
index 6dd4f2e..44ec6b8 100644
--- a/11 - Testing/Testing Expansion Backlog.md	
+++ b/11 - Testing/Testing Expansion Backlog.md	
@@ -104,7 +104,8 @@ Add Playwright tests for:
 
 ## P1 - Notification Assertions
 
-Turn [[Notification Assertion Procedure]] into reusable E2E helpers:
+Initial reusable E2E helpers are implemented in
+`backend/scripts/smoke/marketplace-e2e-notifications.mjs`. Remaining work:
 
 - capture per-user notification baseline;
 - poll `GET /api/notifications` and `GET /api/notifications/unread-count`;
@@ -113,6 +114,13 @@ Turn [[Notification Assertion Procedure]] into reusable E2E helpers:
 - record known notification gaps with route/action and expected recipient;
 - include notification latency in every E2E report.
 
+Current dev findings from the first two-round runner report:
+
+- `NOTIF-E2E-001` passes for buyer new-offer notifications.
+- Seller new-request fanout passes for privately targeted sellers.
+- Rejected-seller notifications pass by rejected offer `relatedId`.
+- `NOTIF-E2E-002` fails by selected offer `relatedId`; accepted-offer notification is not discoverable with the selected offer id.
+
 Acceptance tests:
 
 | ID | Expected |
@@ -125,8 +133,8 @@ Acceptance tests:
 
 ## P1 - Concurrency and Performance Profile
 
-Implement [[Concurrency and Performance Profile]] as an executable runner and
-report generator:
+Initial executable runner and report generator are implemented in
+`backend/scripts/smoke/marketplace-e2e-notifications.mjs`. Remaining work:
 
 - worker abstraction for one isolated buyer/sellers/payment/delivery flow;
 - barrier start for simultaneous workers;
@@ -136,6 +144,13 @@ report generator:
 - infrastructure snapshots before/during/after each stage;
 - stop-condition enforcement.
 
+Current dev blocker:
+
+- Dev API rate limiting is `100` requests per `900s`, so C2+ ramp runs need a
+  fresh window, a lower-polling profile, or a non-rate-limited test environment.
+- `PAYMENT_MODE=record` currently fails because `POST /api/marketplace/payments`
+  returns HTTP 500 after offer selection with generated test actors.
+
 Acceptance tests:
 
 | ID | Expected |
@@ -179,10 +194,13 @@ Add dashboards/log queries for:
 
 ## Suggested Next Automation Order
 
-1. Convert the two-round BSC Testnet E2E procedure into a committed smoke script.
-2. Add non-buyer delivery confirmation regression test.
-3. Add scanner negative tests for wrong token and underpayment.
-4. Implement physical vs digital release policy.
-5. Add release-policy tests.
-6. Resolve dispute route/policy gaps.
-7. Add dispute-to-release/refund E2E tests.
+1. Fix selected-seller accepted notification related id.
+2. Fix or retire the legacy `POST /api/marketplace/payments` record path.
+3. Run `PAYMENT_MODE=status` through delivery after the dev rate-limit window resets.
+4. Run `PAYMENT_MODE=live` once wallet gas/tUSDT and rate-limit headroom are available.
+5. Add non-buyer delivery confirmation regression test.
+6. Add scanner negative tests for wrong token and underpayment.
+7. Implement physical vs digital release policy.
+8. Add release-policy tests.
+9. Resolve dispute route/policy gaps.
+10. Add dispute-to-release/refund E2E tests.
diff --git a/11 - Testing/Testing Overview.md b/11 - Testing/Testing Overview.md
index b96ae55..6ece65a 100644
--- a/11 - Testing/Testing Overview.md	
+++ b/11 - Testing/Testing Overview.md	
@@ -23,6 +23,7 @@ seller, payment scanner, delivery, payout, dispute, and deployment behavior.
 | [[Scanner BSC Testnet Payment Procedure]] | BSC Testnet tUSDT scanner payment procedure and failure modes. |
 | [[Notification Assertion Procedure]] | Required notification checks after every E2E business step. |
 | [[Concurrency and Performance Profile]] | Ramp test design, profiling targets, metrics, and report template. |
+| [[Marketplace E2E Smoke Runner]] | Implemented backend smoke runner, modes, commands, reports, and current dev findings. |
 | [[Smoke and Regression Procedure]] | CLI, CI, and post-deploy smoke checks. |
 | [[Testing Expansion Backlog]] | Gaps to cover before broader release confidence. |
 
@@ -74,3 +75,4 @@ The current live tested version of this path is documented in
 - Record enough evidence to reproduce a failure: request id, offer id, payment id, tx hash, chain id, token address, HTTP status, and CI build number.
 - Treat a passing local test as necessary but not sufficient for scanner/payment work. Payment changes must also be verified against dev after deploy.
 - Every live-dev test should state what remains untested or blocked.
+- Use `backend/scripts/smoke/marketplace-e2e-notifications.sh` for implemented buyer/seller smoke runs before extending scenarios manually.