diff --git a/src/components/EndpointPopover.tsx b/src/components/EndpointPopover.tsx
index cb32350..3054373 100644
--- a/src/components/EndpointPopover.tsx
+++ b/src/components/EndpointPopover.tsx
@@ -1,4 +1,4 @@
-import { useState } from 'react';
+import { useState, useEffect } from 'react';
 import { createPortal } from 'react-dom';
 import {
   KNOWN_SUBSQUID_NODES,
@@ -8,6 +8,7 @@ import {
   setSubsquidUrl,
   setCesiumUrl,
 } from '../services/EndpointConfig';
+import { discoverSquidNodes, clearPeerCache } from '../services/PeerDiscovery';
 import { testEndpoint } from '../hooks/useServiceStatus';
 
 interface Props {
@@ -30,8 +31,11 @@ export function EndpointPopover({ service, onClose, onSaved }: Props) {
 
   const [inputUrl, setInputUrl] = useState(currentUrl);
   const [testResults, setTestResults] = useState<Map<string, TestResult>>(new Map());
+  const [discoveredUrls, setDiscoveredUrls] = useState<string[]>([]);
+  const [discovering, setDiscovering] = useState(false);
+  const [discoverVersion, setDiscoverVersion] = useState(0);
 
-  const runTest = async (url: string) => {
+  const testUrl = async (url: string) => {
     setTestResults((prev) => new Map(prev).set(url, { url, state: 'testing', latencyMs: null }));
     try {
       const ms = await testEndpoint(service, url);
@@ -43,6 +47,23 @@ export function EndpointPopover({ service, onClose, onSaved }: Props) {
     }
   };
 
+  // Découverte des nœuds réseau (SubSquid uniquement)
+  useEffect(() => {
+    if (service !== 'subsquid') return;
+    setDiscovering(true);
+    setDiscoveredUrls([]);
+    discoverSquidNodes().then((urls) => {
+      setDiscoveredUrls(urls);
+      setDiscovering(false);
+      urls.forEach((url) => testUrl(url));
+    });
+  }, [discoverVersion]); // eslint-disable-line react-hooks/exhaustive-deps
+
+  const refreshDiscovery = () => {
+    clearPeerCache();
+    setDiscoverVersion((v) => v + 1);
+  };
+
   const handleSave = () => {
     const trimmed = inputUrl.trim();
     if (!trimmed) return;
@@ -59,12 +80,47 @@ export function EndpointPopover({ service, onClose, onSaved }: Props) {
     return <span className="text-red-500">●</span>;
   };
 
+  const NodeRow = ({ url, label }: { url: string; label?: string }) => {
+    const result = testResults.get(url);
+    const isActive = inputUrl === url;
+    const hostname = label ?? (() => { try { return new URL(url).hostname; } catch { return url; } })();
+    return (
+      <div
+        className={`flex items-center justify-between rounded-xl border px-3 py-2.5 cursor-pointer transition-colors ${
+          isActive
+            ? 'border-[#d4a843]/60 bg-[#d4a843]/5'
+            : 'border-[#1e1f2a] hover:border-[#2e2f3a]'
+        }`}
+        onClick={() => setInputUrl(url)}
+      >
+        <div className="min-w-0">
+          <p className="text-white text-sm font-medium truncate">{hostname}</p>
+          <p className="text-[#4b5563] text-xs font-mono truncate">{url}</p>
+        </div>
+        <div className="flex items-center gap-2 ml-3 shrink-0">
+          {result && (
+            <span className="text-xs font-mono text-[#6b7280]">
+              {dot(result.state)}
+              {result.latencyMs !== null && ` ${result.latencyMs} ms`}
+            </span>
+          )}
+          <button
+            onClick={(e) => { e.stopPropagation(); testUrl(url); }}
+            className="text-xs text-[#4b5563] hover:text-[#d4a843] transition-colors px-2 py-1 border border-[#2e2f3a] rounded-lg"
+          >
+            Tester
+          </button>
+        </div>
+      </div>
+    );
+  };
+
   return createPortal(
     <div
       className="fixed inset-0 z-[9999] flex items-center justify-center bg-black/60 backdrop-blur-sm"
       onClick={(e) => { if (e.target === e.currentTarget) onClose(); }}
     >
-      <div className="bg-[#0f1016] border border-[#2e2f3a] rounded-2xl shadow-2xl w-full max-w-md mx-4 p-6 space-y-5">
+      <div className="bg-[#0f1016] border border-[#2e2f3a] rounded-2xl shadow-2xl w-full max-w-md mx-4 p-6 space-y-5 max-h-[85vh] overflow-y-auto">
 
         {/* Header */}
         <div className="flex items-center justify-between">
@@ -74,45 +130,40 @@ export function EndpointPopover({ service, onClose, onSaved }: Props) {
           <button onClick={onClose} className="text-[#4b5563] hover:text-white transition-colors text-xl leading-none">×</button>
         </div>
 
-        {/* Nœuds connus */}
+        {/* Nœuds connus (statiques) */}
         <div className="space-y-2">
           <p className="text-[#4b5563] text-xs uppercase tracking-widest">Nœuds connus</p>
-          {knownNodes.map((node) => {
-            const result = testResults.get(node.url);
-            const isActive = inputUrl === node.url;
-            return (
-              <div
-                key={node.url}
-                className={`flex items-center justify-between rounded-xl border px-3 py-2.5 cursor-pointer transition-colors ${
-                  isActive
-                    ? 'border-[#d4a843]/60 bg-[#d4a843]/5'
-                    : 'border-[#1e1f2a] hover:border-[#2e2f3a]'
-                }`}
-                onClick={() => setInputUrl(node.url)}
-              >
-                <div className="min-w-0">
-                  <p className="text-white text-sm font-medium truncate">{node.label}</p>
-                  <p className="text-[#4b5563] text-xs font-mono truncate">{node.url}</p>
-                </div>
-                <div className="flex items-center gap-2 ml-3 shrink-0">
-                  {result && (
-                    <span className="text-xs font-mono text-[#6b7280]">
-                      {dot(result.state)}
-                      {result.latencyMs !== null && ` ${result.latencyMs} ms`}
-                    </span>
-                  )}
-                  <button
-                    onClick={(e) => { e.stopPropagation(); runTest(node.url); }}
-                    className="text-xs text-[#4b5563] hover:text-[#d4a843] transition-colors px-2 py-1 border border-[#2e2f3a] rounded-lg"
-                  >
-                    Tester
-                  </button>
-                </div>
-              </div>
-            );
-          })}
+          {knownNodes.map((node) => (
+            <NodeRow key={node.url} url={node.url} label={node.label} />
+          ))}
         </div>
 
+        {/* Nœuds découverts via duniter_peerings (SubSquid uniquement) */}
+        {service === 'subsquid' && (
+          <div className="space-y-2">
+            <div className="flex items-center justify-between">
+              <p className="text-[#4b5563] text-xs uppercase tracking-widest">Réseau Ğ1</p>
+              <button
+                onClick={refreshDiscovery}
+                disabled={discovering}
+                className="text-xs text-[#4b5563] hover:text-[#d4a843] disabled:opacity-40 transition-colors"
+                title="Actualiser la liste des nœuds"
+              >
+                {discovering ? <span className="animate-spin inline-block">↻</span> : '↻ Actualiser'}
+              </button>
+            </div>
+            {discovering && discoveredUrls.length === 0 && (
+              <p className="text-xs text-[#4b5563] pl-1">Découverte en cours…</p>
+            )}
+            {!discovering && discoveredUrls.length === 0 && (
+              <p className="text-xs text-[#4b5563] pl-1">Aucun nœud trouvé</p>
+            )}
+            {discoveredUrls.map((url) => (
+              <NodeRow key={url} url={url} />
+            ))}
+          </div>
+        )}
+
         {/* URL personnalisée */}
         <div className="space-y-2">
           <p className="text-[#4b5563] text-xs uppercase tracking-widest">URL personnalisée</p>
@@ -125,7 +176,7 @@ export function EndpointPopover({ service, onClose, onSaved }: Props) {
               className="flex-1 bg-[#0a0b0f] border border-[#2e2f3a] rounded-xl px-3 py-2 text-white text-sm font-mono placeholder-[#2e2f3a] focus:outline-none focus:border-[#d4a843]/60 transition-colors"
             />
             <button
-              onClick={() => runTest(inputUrl.trim())}
+              onClick={() => testUrl(inputUrl.trim())}
               disabled={!inputUrl.trim()}
               className="text-xs text-[#4b5563] hover:text-[#d4a843] disabled:opacity-30 transition-colors px-3 py-2 border border-[#2e2f3a] rounded-xl"
             >
@@ -134,7 +185,10 @@ export function EndpointPopover({ service, onClose, onSaved }: Props) {
           </div>
           {(() => {
             const result = testResults.get(inputUrl.trim());
-            if (!result || knownNodes.some((n) => n.url === inputUrl.trim())) return null;
+            const isKnown = [...knownNodes, ...discoveredUrls.map((u) => ({ url: u }))].some(
+              (n) => n.url === inputUrl.trim()
+            );
+            if (!result || isKnown) return null;
             return (
               <p className="text-xs font-mono text-[#6b7280] pl-1">
                 {dot(result.state)}
diff --git a/src/components/FlowMap.tsx b/src/components/FlowMap.tsx
index 37feaf5..f4fe62a 100644
--- a/src/components/FlowMap.tsx
+++ b/src/components/FlowMap.tsx
@@ -330,7 +330,7 @@ export function FlowMap({ arcs, focusCity, onCityClick }: FlowMapProps) {
                 style={{ cursor: 'default' }}
               >
                 {/* Zone de hit invisible plus large */}
-                <path d={a.path} fill="none" stroke="transparent" strokeWidth={Math.max(12, a.strokeW + 8)} />
+                <path d={a.path} fill="none" stroke="transparent" strokeWidth={Math.max(4, a.strokeW + 2)} />
                 <path d={a.path} fill="none" stroke={a.stroke} strokeWidth={a.strokeW} strokeLinecap="round" />
                 <polygon points={a.arrowPts} fill={a.arrowFill} />
               </g>
diff --git a/src/services/PeerDiscovery.ts b/src/services/PeerDiscovery.ts
new file mode 100644
index 0000000..e9c02d5
--- /dev/null
+++ b/src/services/PeerDiscovery.ts
@@ -0,0 +1,62 @@
+const DUNITER_RPC = 'https://rpc.duniter.org';
+const CACHE_KEY = 'geoflux-peers-v1';
+const CACHE_TTL_MS = 24 * 60 * 60 * 1000;
+
+interface PeerCache {
+  urls: string[];
+  fetchedAt: number;
+}
+
+function normalizeSquidUrl(raw: string): string {
+  const url = raw.replace(/\/$/, '');
+  return url.endsWith('/v1/graphql') ? url : `${url}/v1/graphql`;
+}
+
+export async function discoverSquidNodes(): Promise<string[]> {
+  try {
+    const cached = localStorage.getItem(CACHE_KEY);
+    if (cached) {
+      const parsed: PeerCache = JSON.parse(cached);
+      if (Date.now() - parsed.fetchedAt < CACHE_TTL_MS) return parsed.urls;
+    }
+  } catch { /* ignore */ }
+
+  const controller = new AbortController();
+  const timer = setTimeout(() => controller.abort(), 8_000);
+  try {
+    const res = await fetch(DUNITER_RPC, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ jsonrpc: '2.0', method: 'duniter_peerings', params: [], id: 1 }),
+      signal: controller.signal,
+    });
+    const data = await res.json();
+    const peers: { peer_id: string; endpoints: { protocol: string; address: string }[] }[] =
+      data?.result?.peerings ?? [];
+
+    const seen = new Set<string>();
+    const urls: string[] = [];
+    for (const peer of peers) {
+      for (const ep of peer.endpoints ?? []) {
+        if (ep.protocol === 'squid' && ep.address) {
+          const normalized = normalizeSquidUrl(ep.address);
+          if (!seen.has(normalized)) {
+            seen.add(normalized);
+            urls.push(normalized);
+          }
+        }
+      }
+    }
+
+    localStorage.setItem(CACHE_KEY, JSON.stringify({ urls, fetchedAt: Date.now() }));
+    return urls;
+  } catch {
+    return [];
+  } finally {
+    clearTimeout(timer);
+  }
+}
+
+export function clearPeerCache(): void {
+  localStorage.removeItem(CACHE_KEY);
+}