diff --git a/docs/contracts/devnet-3.json b/docs/contracts/devnet-3.json
index a495388de..43ce8c8af 100644
--- a/docs/contracts/devnet-3.json
+++ b/docs/contracts/devnet-3.json
@@ -1,24 +1,61 @@
 {
   "network": "igneum-devnet-3",
-  "chain_id": 4463,
-  "chain_id_hex": "0x116f",
+  "chain_id": 4464,
+  "chain_id_hex": "0x1170",
   "note": "Devnet 3, test tokens, no value. The chain may reset; these addresses go with it.",
   "rpc": "https://rpc.devnet.igneum.network",
   "deployed_at": "2026-10-08T10:50:00Z",
   "deployer": "0x07DD4DBca5c1a66755AF28BACCA1D901a2D209aA",
   "source": "contracts/dex (Foundry, solc 0.8.28, evm_version paris, optimizer 200 runs)",
   "contracts": {
-    "WIGN": { "address": "0x47447783D00e1760Eb815a34707b611D53f2A51e", "tx": "0x9fc48e0e3aa6ccdc41ff72381e1986d617722e22cd2b5f0f9f1e988eef60b2d6", "block": 26917 },
-    "TTA": { "address": "0x9ad4F0435f9172A89C6765eE8631CAB2Db3B5052", "tx": "0xa16b6a6501d2705b7c7dc4cf01f8b65b87270e5f1f90b4638b19f120b4830dc0", "block": 26919, "name": "Test Token A", "faucet": "drip() mints 1,000 TTA to the caller once an hour" },
-    "TTB": { "address": "0x996e3042089E80029348d7836472DB34C21841c1", "tx": "0x63eca8238d7f2c29e67c5aad33b0f1cb341d233f2ae0922621e4ba09d94eca61", "block": 26921, "name": "Test Token B", "faucet": "drip() mints 1,000 TTB to the caller once an hour" },
-    "IgneumFactory": { "address": "0x09FF42dbb20448ddB673fD34F973a7D93E7139A8", "tx": "0xd25223b5f1adcba415e51a0936c1ba3e9ae1dcbb1299ec5c4a91293e41ace3bb", "block": 26923 },
-    "IgneumRouter": { "address": "0x9a6fA842C4e58A87AEF1F3aD15233d99283002B7", "tx": "0xabce2fcac81f87fdca02ac4528d4029ebbe1e6d49304dbe6427e1320f2e17b27", "block": 26924 }
+    "WIGN": {
+      "address": "0x47447783D00e1760Eb815a34707b611D53f2A51e",
+      "tx": "0x9fc48e0e3aa6ccdc41ff72381e1986d617722e22cd2b5f0f9f1e988eef60b2d6",
+      "block": 26917
+    },
+    "TTA": {
+      "address": "0x9ad4F0435f9172A89C6765eE8631CAB2Db3B5052",
+      "tx": "0xa16b6a6501d2705b7c7dc4cf01f8b65b87270e5f1f90b4638b19f120b4830dc0",
+      "block": 26919,
+      "name": "Test Token A",
+      "faucet": "drip() mints 1,000 TTA to the caller once an hour"
+    },
+    "TTB": {
+      "address": "0x996e3042089E80029348d7836472DB34C21841c1",
+      "tx": "0x63eca8238d7f2c29e67c5aad33b0f1cb341d233f2ae0922621e4ba09d94eca61",
+      "block": 26921,
+      "name": "Test Token B",
+      "faucet": "drip() mints 1,000 TTB to the caller once an hour"
+    },
+    "IgneumFactory": {
+      "address": "0x09FF42dbb20448ddB673fD34F973a7D93E7139A8",
+      "tx": "0xd25223b5f1adcba415e51a0936c1ba3e9ae1dcbb1299ec5c4a91293e41ace3bb",
+      "block": 26923
+    },
+    "IgneumRouter": {
+      "address": "0x9a6fA842C4e58A87AEF1F3aD15233d99283002B7",
+      "tx": "0xabce2fcac81f87fdca02ac4528d4029ebbe1e6d49304dbe6427e1320f2e17b27",
+      "block": 26924
+    }
   },
   "pairs": {
-    "TTA_WIGN": { "address": "0x5352Fc2723014Bb45A5b1767Df549DA755773A2B", "seeded": "500 TTA beside 100 IGN", "block": 26969 },
-    "TTB_WIGN": { "address": "0x93Db70744e200D647f783C3953dF35d7394EdBC5", "seeded": "500 TTB beside 100 IGN", "block": 26970 },
-    "TTA_TTB": { "address": "0xF35775db56dE4f1Cd8Ed7ea7CAb8D017d584a96F", "seeded": "500 TTA beside 500 TTB", "block": 26972 }
+    "TTA_WIGN": {
+      "address": "0x5352Fc2723014Bb45A5b1767Df549DA755773A2B",
+      "seeded": "500 TTA beside 100 IGN",
+      "block": 26969
+    },
+    "TTB_WIGN": {
+      "address": "0x93Db70744e200D647f783C3953dF35d7394EdBC5",
+      "seeded": "500 TTB beside 100 IGN",
+      "block": 26970
+    },
+    "TTA_TTB": {
+      "address": "0xF35775db56dE4f1Cd8Ed7ea7CAb8D017d584a96F",
+      "seeded": "500 TTA beside 500 TTB",
+      "block": 26972
+    }
   },
   "fee": "0.3 percent per swap, kept in the pool",
-  "gas_note": "Devnet 3 charges the proving dimension inside the execution gas: a local EVM estimate runs out (drip() failed at 133,603 gas in block 26925; the node's eth_estimateGas said 685,513). Send with the node's own estimate (forge script --skip-simulation, or eth_estimateGas before every send)."
+  "gas_note": "Devnet 3 charges the proving dimension inside the execution gas: a local EVM estimate runs out (drip() failed at 133,603 gas in block 26925; the node's eth_estimateGas said 685,513). Send with the node's own estimate (forge script --skip-simulation, or eth_estimateGas before every send).",
+  "chain_id_note": "4463 (0x116f) below the class v5 floor; 4464 (0x1170) from DAA 68,400 (crossed 8 October 2026, read 13:27 BST); the AMM was deployed under 4463 and the contracts are unchanged by the floor; read eth_chainId, never fix it"
 }
diff --git a/site/swap.html b/site/swap.html
index 583fae848..fefc95287 100644
--- a/site/swap.html
+++ b/site/swap.html
@@ -232,7 +232,7 @@ dt{color:var(--ash)}dd{margin:0;font-family:var(--f-mono);font-size:13px;overflo
       <h2 id="swap-h">Swap</h2>
       <div class="wallet-row">
         <button class="btn" id="connect" type="button">Connect wallet</button>
-        <span class="status" id="wallet" role="status" aria-live="polite">No wallet connected. The Igneum Wallet open on this machine, or MetaMask, on chain id 4463.</span>
+        <span class="status" id="wallet" role="status" aria-live="polite">No wallet connected. The Igneum Wallet open on this machine, or MetaMask, on the Devnet 3 chain id shown under Pools.</span>
       </div>
       <form id="swap-form" novalidate>
         <label for="amount-in">You send</label>
@@ -282,7 +282,7 @@ dt{color:var(--ash)}dd{margin:0;font-family:var(--f-mono);font-size:13px;overflo
         <div class="status" id="lp-status" role="status" aria-live="polite"></div>
       </form>
       <dl>
-        <dt>Chain</dt><dd>igneum-devnet-3, chain id 4463 (0x116f)</dd>
+        <dt>Chain</dt><dd>igneum-devnet-3, chain id <span id="chain-id">reading…</span></dd>
         <dt>RPC</dt><dd><code>https://rpc.devnet.igneum.network</code></dd>
         <dt>Router</dt><dd><code class="addr" data-addr="router"></code></dd>
         <dt>Factory</dt><dd><code class="addr" data-addr="factory"></code></dd>
@@ -372,7 +372,8 @@ dt{color:var(--ash)}dd{margin:0;font-family:var(--f-mono);font-size:13px;overflo
   // extension injects one, window.igneum beside MetaMask, announced through EIP-6963. Reads go to the public RPC; sends go
   // through the connected wallet (EIP-1193: MetaMask and any wallet that injects window.ethereum), which asks the node
   // for the gas limit itself (Devnet 3 charges proving gas inside execution gas, so a local estimate runs out).
-  var RPC='https://rpc.devnet.igneum.network', CHAIN_ID=4463, CHAIN_HEX='0x116f';
+  // the chain id is read from the RPC at load (4463 below the class v5 floor, 4464 from DAA 68,400 on 8 October 2026), never fixed here
+  var RPC='https://rpc.devnet.igneum.network', CHAIN_ID=null, CHAIN_HEX=null;
   var A={router:'0x9a6fA842C4e58A87AEF1F3aD15233d99283002B7',factory:'0x09FF42dbb20448ddB673fD34F973a7D93E7139A8',wign:'0x47447783D00e1760Eb815a34707b611D53f2A51e',tta:'0x9ad4F0435f9172A89C6765eE8631CAB2Db3B5052',ttb:'0x996e3042089E80029348d7836472DB34C21841c1'};
   var TOKENS=[{key:'ign',sym:'IGN',name:'IGN (the coin, wrapped on the way in)',addr:A.wign,native:true},{key:'tta',sym:'TTA',name:'Test Token A',addr:A.tta},{key:'ttb',sym:'TTB',name:'Test Token B',addr:A.ttb}];
   var POOLS=[{name:'TTA / IGN',a:A.tta,b:A.wign,sa:'TTA',sb:'IGN'},{name:'TTB / IGN',a:A.ttb,b:A.wign,sa:'TTB',sb:'IGN'},{name:'TTA / TTB',a:A.tta,b:A.ttb,sa:'TTA',sb:'TTB'}];
@@ -398,6 +399,7 @@ dt{color:var(--ash)}dd{margin:0;font-family:var(--f-mono);font-size:13px;overflo
   // ---- the wallet ----
   function connect(){
     var eth=window.ethereum;
+    if(!CHAIN_ID){say($('wallet'),'The chain id is not read yet (the public RPC did not answer). Try again in a moment.','bad');return;}
     if(!eth){say($('wallet'),'No wallet found. Open the Igneum Wallet on this machine (0.1.6 or later; the page finds it by itself) or install MetaMask, then tap Connect again.','bad');return;}
     eth.request({method:'eth_requestAccounts'}).then(function(acc){
       account=acc[0];provider=eth;
@@ -527,6 +529,8 @@ dt{color:var(--ash)}dd{margin:0;font-family:var(--f-mono);font-size:13px;overflo
     POOLS.forEach(function(p,i){$('lp-pool').add(new Option(p.name,String(i)));});
     document.querySelectorAll('.addr').forEach(function(el){el.textContent=A[el.getAttribute('data-addr')];});
   }
+  function readChainId(){return rpc('eth_chainId',[]).then(function(h){CHAIN_ID=parseInt(h,16);CHAIN_HEX='0x'+CHAIN_ID.toString(16);$('chain-id').textContent=CHAIN_ID+' ('+CHAIN_HEX+')';}).catch(function(){$('chain-id').textContent='unread (the RPC did not answer)';});}
+  readChainId();setInterval(readChainId,60000);
   fillSelects();refreshPools();setInterval(refreshPools,30000);
   // a wallet picker when both are present: the Igneum Wallet by EIP-6963, else whatever window.ethereum is
   var igneumProvider=null;