diff --git a/.changeset/fuzzy-foxes-serve.md b/.changeset/fuzzy-foxes-serve.md
new file mode 100644
index 00000000..c4ebe9ac
--- /dev/null
+++ b/.changeset/fuzzy-foxes-serve.md
@@ -0,0 +1,5 @@
+---
+'@api3/chains': patch
+---
+
+Fix sonic-testnet rpcUrl and browserUrl
diff --git a/.changeset/late-shirts-jog.md b/.changeset/late-shirts-jog.md
new file mode 100644
index 00000000..5549e4e3
--- /dev/null
+++ b/.changeset/late-shirts-jog.md
@@ -0,0 +1,5 @@
+---
+'@api3/chains': patch
+---
+
+Fix zircuit and zircuit-sepolia-testnet browserUrl
diff --git a/chains/sonic-testnet.json b/chains/sonic-testnet.json
index 9aad1229..6ee9ec36 100644
--- a/chains/sonic-testnet.json
+++ b/chains/sonic-testnet.json
@@ -2,14 +2,14 @@
   "alias": "sonic-testnet",
   "decimals": 18,
   "explorer": {
-    "browserUrl": "https://public-sonic.fantom.network/"
+    "browserUrl": "https://testnet.soniclabs.com/"
   },
   "id": "64165",
   "name": "Sonic testnet",
   "providers": [
     {
       "alias": "default",
-      "rpcUrl": "https://rpc.sonic.fantom.network"
+      "rpcUrl": "https://rpc.testnet.soniclabs.com"
     }
   ],
   "symbol": "S",
diff --git a/chains/zircuit-sepolia-testnet.json b/chains/zircuit-sepolia-testnet.json
index 2e18c9b6..14ee8183 100644
--- a/chains/zircuit-sepolia-testnet.json
+++ b/chains/zircuit-sepolia-testnet.json
@@ -6,9 +6,9 @@
       "key": {
         "required": true
       },
-      "url": "https://explorer.zircuit.com/api/contractVerifyHardhat"
+      "url": "https://explorer.testnet.zircuit.com/api/contractVerifyHardhat"
     },
-    "browserUrl": "https://explorer.zircuit.com/"
+    "browserUrl": "https://explorer.testnet.zircuit.com/"
   },
   "id": "48899",
   "name": "Zircuit testnet",
diff --git a/chains/zircuit.json b/chains/zircuit.json
index c98ecc65..54017b24 100644
--- a/chains/zircuit.json
+++ b/chains/zircuit.json
@@ -2,7 +2,13 @@
   "alias": "zircuit",
   "decimals": 18,
   "explorer": {
-    "browserUrl": "https://explorermainnet.zircuit.com/"
+    "api": {
+      "key": {
+        "required": true
+      },
+      "url": "https://explorer.zircuit.com/api/contractVerifyHardhat"
+    },
+    "browserUrl": "https://explorer.zircuit.com/"
   },
   "id": "48900",
   "name": "Zircuit",
diff --git a/src/generated/chains.ts b/src/generated/chains.ts
index c4c70a34..799f076e 100644
--- a/src/generated/chains.ts
+++ b/src/generated/chains.ts
@@ -1533,10 +1533,10 @@ export const CHAINS: Chain[] = [
   {
     alias: 'sonic-testnet',
     decimals: 18,
-    explorer: { browserUrl: 'https://public-sonic.fantom.network/' },
+    explorer: { browserUrl: 'https://testnet.soniclabs.com/' },
     id: '64165',
     name: 'Sonic testnet',
-    providers: [{ alias: 'default', rpcUrl: 'https://rpc.sonic.fantom.network' }],
+    providers: [{ alias: 'default', rpcUrl: 'https://rpc.testnet.soniclabs.com' }],
     symbol: 'S',
     testnet: true,
   },
@@ -1628,8 +1628,8 @@ export const CHAINS: Chain[] = [
     alias: 'zircuit-sepolia-testnet',
     decimals: 18,
     explorer: {
-      api: { key: { required: true }, url: 'https://explorer.zircuit.com/api/contractVerifyHardhat' },
-      browserUrl: 'https://explorer.zircuit.com/',
+      api: { key: { required: true }, url: 'https://explorer.testnet.zircuit.com/api/contractVerifyHardhat' },
+      browserUrl: 'https://explorer.testnet.zircuit.com/',
     },
     id: '48899',
     name: 'Zircuit testnet',
@@ -1640,7 +1640,10 @@ export const CHAINS: Chain[] = [
   {
     alias: 'zircuit',
     decimals: 18,
-    explorer: { browserUrl: 'https://explorermainnet.zircuit.com/' },
+    explorer: {
+      api: { key: { required: true }, url: 'https://explorer.zircuit.com/api/contractVerifyHardhat' },
+      browserUrl: 'https://explorer.zircuit.com/',
+    },
     id: '48900',
     name: 'Zircuit',
     providers: [