diff --git a/packages/ethereum-viewer/src/explorer/networks.ts b/packages/ethereum-viewer/src/explorer/networks.ts
index 466bb68..2dac5cc 100644
--- a/packages/ethereum-viewer/src/explorer/networks.ts
+++ b/packages/ethereum-viewer/src/explorer/networks.ts
@@ -2,33 +2,33 @@
  * mapping from DethCode subdomain to Etherscan-like API URL
  */
 export const explorerApiUrls = {
-  etherscan: "https://api.etherscan.io/api",
+  etherscan: "https://api.etherscan.io/v2/api?chainid=1",
   "sepolia.etherscan": "https://api-sepolia.etherscan.io/api",
   "holesky.etherscan": "https://api-holesky.etherscan.io/api",
-  bscscan: "https://api.bscscan.com/api",
+  bscscan: "https://api.etherscan.io/v2/api?chainid=56",
   "testnet.bscscan": "https://api-testnet.bscscan.com/api",
   hecoinfo: "https://api.hecoinfo.com/api",
   "testnet.hecoinfo": "https://api-testnet.hecoinfo.com/api",
   ftmscan: "https://api.ftmscan.com/api",
   "testnet.ftmscan": "https://api-testnet.ftmscan.com/api",
-  "optimistic.etherscan": "https://api-optimistic.etherscan.io/api",
+  "optimistic.etherscan": "https://api.etherscan.io/v2/api?chainid=10",
   "sepolia-optimistic.etherscan":
     "https://api-sepolia-optimistic.etherscan.io/api",
-  polygonscan: "https://api.polygonscan.com/api",
+  polygonscan: "https://api.etherscan.io/v2/api?chainid=137",
   "testnet.polygonscan": "https://api-testnet.polygonscan.com/api",
-  arbiscan: "https://api.arbiscan.io/api",
+  arbiscan: "https://api.etherscan.io/v2/api?chainid=42161",
   "sepolia.arbiscan": "https://api-sepolia.arbiscan.io/api",
   snowtrace: "https://api.snowtrace.io/api",
   "testnet.snowtrace": "https://api-testnet.snowtrace.io/api",
   cronoscan: "https://api.cronoscan.com/api",
-  basescan: "https://api.basescan.org/api",
+  basescan: "https://api.etherscan.io/v2/api?chainid=8453",
   "sepolia.basescan": "https://api-sepolia.basescan.org/api",
-  gnosisscan: "https://api.gnosisscan.io/api",
-  fraxscan: "https://api.fraxscan.com/api",
+  gnosisscan: "https://api.etherscan.io/v2/api?chainid=100",
+  fraxscan: "https://api.etherscan.io/v2/api?chainid=252",
   "holesky.fraxscan": "https://api-holesky.fraxscan.com/api",
-  blastscan: "https://api.blastscan.io/api",
+  blastscan: "https://api.etherscan.io/v2/api?chainid=81457",
   "sepolia.blastscan": "https://api-sepolia.blastscan.io/api",
-  sonicscan: "https://api.sonicscan.org/api",
+  sonicscan: "https://api.etherscan.io/v2/api?chainid=146",
   "testnet.sonicscan": "https://api-testnet.sonicscan.org/api",
 };
 
@@ -80,7 +80,6 @@ const ARBISCAN_KEY = "X3ZWJBXC14HTIR3B9DNYGEUICEIKKZ9ENZ";
 const POLYGONSCAN_KEY = "RV4YXDXEMIHXMC7ZXB8T82G4F56FRZ1SZQ";
 const CRONOSCAN_KEY = "BGAN1CWT8E1A2XRS3FU61UP7XXFMHBWNSY";
 const BASESCAN_KEY = "ICQQDUA1C8R2EZY6M4QIIV7WUEZM8INNA7";
-const GNOSISSCAN_KEY = "7PWN1FIPXW6WDSGH3PIHRW1EEU4A882QSQ";
 const FRAXSCAN_KEY = "TEUJWRCAKIXQCUR7XZRKCFRH3QHH344PAM";
 const BLASTSCAN_KEY = "G6DR1ZFYP54GG49SJ9GID37SFQPV96H77E";
 const SONICSCAN_KEY = "QTH3YA3WFHJH76EV6KWN2PQTDJKA85PN4D";
@@ -91,13 +90,13 @@ export const explorerApiKeys: Record<ApiName, string> = {
   "sepolia.etherscan": ETHERSCAN_KEY,
   "holesky.etherscan": ETHERSCAN_KEY,
 
-  "optimistic.etherscan": OPTIMISM_KEY,
+  "optimistic.etherscan": ETHERSCAN_KEY,
   "sepolia-optimistic.etherscan": OPTIMISM_KEY,
 
-  arbiscan: ARBISCAN_KEY,
+  arbiscan: ETHERSCAN_KEY,
   "sepolia.arbiscan": ARBISCAN_KEY,
 
-  bscscan: BSCSCAN_KEY,
+  bscscan: ETHERSCAN_KEY,
   "testnet.bscscan": BSCSCAN_KEY,
 
   ftmscan: FTMSCAN_KEY,
@@ -106,7 +105,7 @@ export const explorerApiKeys: Record<ApiName, string> = {
   hecoinfo: HECOINFO_KEY,
   "testnet.hecoinfo": HECOINFO_KEY,
 
-  polygonscan: POLYGONSCAN_KEY,
+  polygonscan: ETHERSCAN_KEY,
   "testnet.polygonscan": POLYGONSCAN_KEY,
 
   snowtrace: SNOWTRACE_KEY,
@@ -114,17 +113,17 @@ export const explorerApiKeys: Record<ApiName, string> = {
 
   cronoscan: CRONOSCAN_KEY,
 
-  basescan: BASESCAN_KEY,
+  basescan: ETHERSCAN_KEY,
   "sepolia.basescan": BASESCAN_KEY,
 
-  gnosisscan: GNOSISSCAN_KEY,
+  gnosisscan: ETHERSCAN_KEY,
 
-  fraxscan: FRAXSCAN_KEY,
+  fraxscan: ETHERSCAN_KEY,
   "holesky.fraxscan": FRAXSCAN_KEY,
 
-  blastscan: BLASTSCAN_KEY,
+  blastscan: ETHERSCAN_KEY,
   "sepolia.blastscan": BLASTSCAN_KEY,
 
-  sonicscan: SONICSCAN_KEY,
+  sonicscan: ETHERSCAN_KEY,
   "testnet.sonicscan": SONICSCAN_KEY,
 };