diff --git a/open-sse/services/poolGeo.js b/open-sse/services/poolGeo.js
new file mode 100644
index 00000000..319934d3
--- /dev/null
+++ b/open-sse/services/poolGeo.js
@@ -0,0 +1,137 @@
+// Pool egress geo — engine layer, shared by the dashboard UI (Proxy Fitness /
+// Proxy Pools egress column) and any provider region policy that wants to
+// pre-mark pools unfit by egress region.
+//
+// The probe transport is provider-agnostic: it fetches ipinfo.io THROUGH the
+// pool itself (relay headers for vercel/cloudflare/deno, proxy URL for
+// socks/http), so it works for every pool type and every provider.
+
+// The probe transport is provider-agnostic: it fetches ipinfo.io THROUGH the
+// pool itself (relay headers for vercel/cloudflare/deno, proxy URL for
+// socks/http), so it works for every pool type and every provider.
+//
+// State lives on globalThis (same reason as proxyPoolFitness): the background
+// probe and the /api/proxy-pools reader must share ONE cache across Next dev
+// bundles.
+
+const GEO_STATE_KEY = "__9routerPoolGeo__";
+const geoCache = (globalThis[GEO_STATE_KEY] ??= new Map()); // poolId -> { ip, country, ..., ts, ipHistory }
+
+export const POOL_GEO_TTL_MS = 60 * 60 * 1000;
+// How many past egress IPs to remember for flapping detection.
+export const POOL_GEO_IP_HISTORY_MAX = 8;
+
+// Debounce probe-failure logs: one line per failing pool per hour — the probe
+// runs every 30 min, so a broken relay must not spam the log every pass.
+const probeFailLogs = new Map(); // proxyUrl -> lastLoggedAt
+const PROBE_FAIL_LOG_INTERVAL_MS = 60 * 60 * 1000;
+
+function logProbeFailure(kind, proxyUrl, detail) {
+  const key = String(proxyUrl || "");
+  const now = Date.now();
+  if (probeFailLogs.has(key) && now - probeFailLogs.get(key) < PROBE_FAIL_LOG_INTERVAL_MS) return;
+  probeFailLogs.set(key, now);
+  console.log(`[GeoProbe] ${kind} ${key.slice(0, 60)}${detail ? ` | ${detail.slice(0, 120)}` : ""}`);
+}
+
+// Test helper: drop all cached geo (module state is globalThis-backed).
+export function resetPoolGeo() {
+  geoCache.clear();
+}
+
+// Attach stability classification: >=2 distinct egress IPs observed = flapping
+// (typical for serverless relays — Vercel/Cloudflare egress varies per colo).
+function withStability(entry) {
+  const ips = new Set([entry?.ip, ...(entry?.ipHistory || []).map((h) => h.ip)]);
+  ips.delete("");
+  const ipCount = ips.size;
+  return { ...entry, ipCount, isUnstable: ipCount >= 2 };
+}
+
+export function getPoolGeo(poolId) {
+  const entry = geoCache.get(poolId);
+  if (!entry) return null;
+  if (entry.ts + POOL_GEO_TTL_MS < Date.now()) {
+    geoCache.delete(poolId);
+    return null;
+  }
+  return withStability(entry);
+}
+
+export function setPoolGeo(poolId, geo) {
+  if (!poolId || !geo?.ip) return;
+  const prev = geoCache.get(poolId);
+  const ipHistory = prev?.ipHistory ? [...prev.ipHistory] : [];
+  if (prev?.ip && prev.ip !== geo.ip) {
+    // Record the IP we are leaving — the history tracks past egress IPs.
+    ipHistory.push({ ip: prev.ip, ts: Date.now() });
+    if (ipHistory.length > POOL_GEO_IP_HISTORY_MAX) ipHistory.shift();
+  }
+  geoCache.set(poolId, { ...geo, ts: Date.now(), ipHistory });
+}
+
+export function poolGeoSnapshot(now = Date.now()) {
+  const out = {};
+  for (const [poolId, entry] of geoCache) {
+    if (entry.ts + POOL_GEO_TTL_MS <= now) {
+      geoCache.delete(poolId);
+      continue;
+    }
+    out[poolId] = withStability(entry);
+  }
+  return out;
+}
+
+// Sweep geo entries past their TTL (ipHistory rides along with the entry).
+// Returns how many entries were removed.
+export function pruneStaleGeo(now = Date.now()) {
+  let removed = 0;
+  for (const [poolId, entry] of geoCache) {
+    if (entry.ts + POOL_GEO_TTL_MS <= now) {
+      geoCache.delete(poolId);
+      removed += 1;
+    }
+  }
+  return removed;
+}
+
+// Probe the egress geo of one pool via ipinfo through the pool. Fail-open:
+// returns null on any error/timeout. `pool` shape: { proxyUrl, type }.
+export async function probePoolGeo(pool, timeoutMs = 15000) {
+  const proxyUrl = pool?.proxyUrl;
+  if (!proxyUrl) return null;
+  const { proxyAwareFetch } = await import("../utils/proxyFetch.js");
+  const isRelay = ["vercel", "cloudflare", "deno"].includes(pool?.type);
+  const proxyOptions = isRelay
+    ? { vercelRelayUrl: proxyUrl }
+    : { connectionProxyEnabled: true, connectionProxyUrl: proxyUrl };
+
+  const ctrl = new AbortController();
+  const timer = setTimeout(() => ctrl.abort(new Error("geo probe timeout")), timeoutMs);
+  try {
+    const res = await proxyAwareFetch("https://ipinfo.io/json", { signal: ctrl.signal }, proxyOptions);
+    if (!res.ok) {
+      const txt = await res.text().catch(() => "");
+      logProbeFailure(`http ${res.status}`, proxyUrl, txt);
+      return null;
+    }
+    const data = await res.json().catch(() => null);
+    if (!data?.ip) {
+      logProbeFailure("no-ip", proxyUrl, "");
+      return null;
+    }
+    return {
+      ip: data.ip || "",
+      country: data.country || "",
+      region: data.region || "",
+      city: data.city || "",
+      org: data.org || "",
+      isDatacenter: /(cloudflare|vercel|amazon|aws|google|microsoft|azure|digitalocean|hetzner|ovh|contabo|leaseweb)/i.test(String(data.org || "")),
+    };
+  } catch (error) {
+    logProbeFailure("fail", proxyUrl, `${error?.name}: ${error?.message}`);
+    return null;
+  } finally {
+    clearTimeout(timer);
+  }
+}
diff --git a/src/lib/network/poolEgressProbe.js b/src/lib/network/poolEgressProbe.js
new file mode 100644
index 00000000..cd76ec15
--- /dev/null
+++ b/src/lib/network/poolEgressProbe.js
@@ -0,0 +1,75 @@
+// Background pool egress geo probe — fills the poolGeo cache so the Proxy
+// Fitness / Proxy Pools UI can show each pool's egress IP + country, and
+// future provider region policies can pre-mark pools unfit.
+// Fail-open everywhere; never blocks startup or requests.
+
+import { getProxyPools } from "@/models";
+import { probePoolGeo, setPoolGeo, getPoolGeo } from "open-sse/services/poolGeo.js";
+import { isNonServerRuntime } from "@/sse/services/backgroundTokenRefresh.js";
+
+const PROBE_INTERVAL_MS = 30 * 60 * 1000;
+const INITIAL_DELAY_MS = 15 * 1000;
+const CONCURRENCY = 4;
+// Re-probe a pool when its last sample is older than this — multiple samples
+// per pool are what let us flag flapping (changing egress) relays.
+const GEO_REPROBE_MS = 15 * 60 * 1000;
+
+let started = false;
+let intervalHandle = null;
+let initialTimeoutHandle = null;
+let probing = false;
+
+// probe with bounded concurrency; re-probes pools whose sample is stale enough.
+async function probeAll() {
+  if (probing) return;
+  probing = true;
+  try {
+    const pools = await getProxyPools({ isActive: true });
+    const now = Date.now();
+    const targets = (pools || []).filter((p) => {
+      if (!p?.proxyUrl) return false;
+      const geo = getPoolGeo(p.id);
+      return !geo || now - geo.ts >= GEO_REPROBE_MS;
+    });
+    if (targets.length === 0) return;
+    console.log(`[PoolEgressProbe] probing ${targets.length}/${(pools || []).length} active pools`);
+    let next = 0;
+    const workers = Array.from({ length: Math.min(CONCURRENCY, Math.max(targets.length, 1)) }, async () => {
+      while (next < targets.length) {
+        const pool = targets[next++];
+        const geo = await probePoolGeo(pool);
+        if (geo) setPoolGeo(pool.id, geo);
+      }
+    });
+    await Promise.allSettled(workers);
+    const filled = (pools || []).filter((p) => getPoolGeo(p.id)).length;
+    console.log(`[PoolEgressProbe] pass done — geo cached for ${filled}/${(pools || []).length} pools`);
+  } catch (e) {
+    console.log(`[PoolEgressProbe] pass failed: ${e?.message || e}`);
+  } finally {
+    probing = false;
+  }
+}
+
+export function startPoolEgressProbe({ intervalMs } = {}) {
+  if (started) return false;
+  if (isNonServerRuntime()) return false;
+  started = true;
+  const period = Number.isFinite(intervalMs) && intervalMs > 0 ? intervalMs : PROBE_INTERVAL_MS;
+  console.log("[PoolEgressProbe] Scheduler started", { intervalMs: period, initialDelayMs: INITIAL_DELAY_MS });
+  initialTimeoutHandle = setTimeout(() => { probeAll().catch(() => {}); }, INITIAL_DELAY_MS);
+  if (initialTimeoutHandle.unref) initialTimeoutHandle.unref();
+  intervalHandle = setInterval(() => { probeAll().catch(() => {}); }, period);
+  if (intervalHandle.unref) intervalHandle.unref();
+  return true;
+}
+
+export function stopPoolEgressProbe() {
+  if (initialTimeoutHandle) clearTimeout(initialTimeoutHandle);
+  if (intervalHandle) clearInterval(intervalHandle);
+  initialTimeoutHandle = null;
+  intervalHandle = null;
+  started = false;
+}
+
+export const __test__ = { probeAll };
diff --git a/src/lib/network/stateSweeper.js b/src/lib/network/stateSweeper.js
new file mode 100644
index 00000000..df33c673
--- /dev/null
+++ b/src/lib/network/stateSweeper.js
@@ -0,0 +1,47 @@
+// Periodic in-memory state sweeper — a cron-like job that prunes expired data
+// so here long-running servers never accumulate stale entries:
+//   • pool fitness marks (proxyPoolFitness.pruneExpired)
+//   • pool egress geo cache incl. ipHistory (poolGeo.pruneStaleGeo)
+//   • freebuff session cache + cooldowns (freebuff.pruneSessionState)
+// Fail-open everywhere; never blocks startup or requests.
+
+import { pruneExpired } from "open-sse/services/proxyPoolFitness.js";
+import { pruneStaleGeo } from "open-sse/services/poolGeo.js";
+import { isNonServerRuntime } from "@/sse/services/backgroundTokenRefresh.js";
+
+const SWEEP_INTERVAL_MS = 10 * 60 * 1000;
+
+let started = false;
+let handle = null;
+
+async function sweep() {
+  try {
+    const fitness = pruneExpired();
+    const geo = pruneStaleGeo();
+    const { pruneSessionState } = await import("open-sse/executors/freebuff.js");
+    const sessions = pruneSessionState();
+    if (fitness || geo || sessions) {
+      console.log(`[StateSweeper] pruned ${fitness} fitness, ${geo} geo, ${sessions} session/cooldown entries`);
+    }
+  } catch {
+    // fail-open: next tick retries
+  }
+}
+
+export function startStateSweeper({ intervalMs } = {}) {
+  if (started) return false;
+  if (isNonServerRuntime()) return false;
+  started = true;
+  const period = Number.isFinite(intervalMs) && intervalMs > 0 ? intervalMs : SWEEP_INTERVAL_MS;
+  handle = setInterval(() => { sweep().catch(() => {}); }, period);
+  if (handle.unref) handle.unref();
+  return true;
+}
+
+export function stopStateSweeper() {
+  if (handle) clearInterval(handle);
+  handle = null;
+  started = false;
+}
+
+export const __test__ = { sweep };
\ No newline at end of file
diff --git a/src/shared/services/initializeApp.js b/src/shared/services/initializeApp.js
index 5b27f774..e627c560 100644
--- a/src/shared/services/initializeApp.js
+++ b/src/shared/services/initializeApp.js
@@ -118,6 +118,16 @@ async function runHeavyStartup() {
   import("@/sse/services/backgroundTokenRefresh.js")
     .then(({ startBackgroundTokenRefresh }) => startBackgroundTokenRefresh())
     .catch((e) => console.log("[BackgroundTokenRefresh] scheduler start failed:", e.message));
+
+  // Pool egress geo probe — fills the Proxy Fitness / Proxy Pools egress column.
+  import("@/lib/network/poolEgressProbe.js")
+    .then(({ startPoolEgressProbe }) => startPoolEgressProbe())
+    .catch((e) => console.log("[PoolEgressProbe] scheduler start failed:", e.message));
+
+  // Periodic in-memory state sweeper — prunes expired fitness/geo/session state.
+  import("@/lib/network/stateSweeper.js")
+    .then(({ startStateSweeper }) => startStateSweeper())
+    .catch((e) => console.log("[StateSweeper] scheduler start failed:", e.message));
 }
 
 function hasQuotaAutoPingEnabled(settings) {
diff --git a/tests/unit/pool-geo.test.js b/tests/unit/pool-geo.test.js
new file mode 100644
index 00000000..71f4eef2
--- /dev/null
+++ b/tests/unit/pool-geo.test.js
@@ -0,0 +1,26 @@
+import { describe, it, expect, beforeEach } from "vitest";
+import { setPoolGeo, getPoolGeo, poolGeoSnapshot, pruneStaleGeo, resetPoolGeo } from "open-sse/services/poolGeo.js";
+
+describe("pool egress geo cache", () => {
+  beforeEach(() => resetPoolGeo());
+
+  it("stores geo and classifies stability from egress changes", () => {
+    setPoolGeo("p1", { ip: "1.1.1.1", country: "US" });
+    setPoolGeo("p1", { ip: "1.1.1.1", country: "US" }); // same IP twice
+    expect(getPoolGeo("p1").isUnstable).toBe(false);
+    expect(getPoolGeo("p1").ipCount).toBe(1);
+
+    setPoolGeo("p1", { ip: "2.2.2.2", country: "US" }); // changed
+    expect(getPoolGeo("p1").isUnstable).toBe(true);
+    expect(getPoolGeo("p1").ipCount).toBe(2);
+  });
+
+  it("prunes TTL-stale entries (ipHistory rides along)", () => {
+    setPoolGeo("p1", { ip: "1.1.1.1", country: "US" });
+    setPoolGeo("p1", { ip: "2.2.2.2", country: "US" });
+    const cache = globalThis["__9routerPoolGeo__"];
+    cache.get("p1").ts = Date.now() - 2 * 60 * 60 * 1000;
+    expect(pruneStaleGeo()).toBe(1);
+    expect(poolGeoSnapshot()).toEqual({});
+  });
+});
\ No newline at end of file