diff --git a/bun.lockb b/bun.lockb
index 597a2e00..6b7c7f0d 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/package.json b/package.json
index e5a3f5c7..226b7077 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,7 @@
     "contracts/ReadBytesAt.sol"
   ],
   "devDependencies": {
-    "@adraffy/blocksmith": "^0.1.46",
+    "@adraffy/blocksmith": "^0.1.47",
     "@types/bun": "latest",
     "@typescript-eslint/eslint-plugin": "^6.7.4",
     "@typescript-eslint/parser": "^6.7.4",
diff --git a/src/GatewayProvider.ts b/src/GatewayProvider.ts
index 0c703059..9fba0bd6 100755
--- a/src/GatewayProvider.ts
+++ b/src/GatewayProvider.ts
@@ -25,7 +25,8 @@ export class GatewayProvider extends JsonRpcProvider {
         jsonrpc: '2.0',
       }),
     });
-    const { result } = await res.json();
+    const { result, error } = await res.json();
+    if (!res.ok || error) throw new Error(error?.message ?? 'expected rpc');
     return new this(new FetchRequest(url), BigInt(result));
   }
   constructor(
diff --git a/src/chains.ts b/src/chains.ts
index 25a4a5b8..e9671368 100755
--- a/src/chains.ts
+++ b/src/chains.ts
@@ -45,6 +45,9 @@ export const CHAINS = {
   WORLD: 480n,
   WORLD_SEPOLIA: 4801n,
   APE: 33139n,
+  ZERO: 543210n,
+  ZERO_SEPOLIA: 4457845n,
+  INK_SEPOLIA: 763373n,
 } as const satisfies Record<string, Chain>;
 
 export function chainName(chain: Chain): string {
diff --git a/src/op/OPFaultRollup.ts b/src/op/OPFaultRollup.ts
index 64d14a12..e80b0705 100755
--- a/src/op/OPFaultRollup.ts
+++ b/src/op/OPFaultRollup.ts
@@ -59,6 +59,14 @@ export class OPFaultRollup extends AbstractOPRollup {
     GameFinder: GAME_FINDER_SEPOLIA,
   };
 
+  // https://docs.inkonchain.com/build/useful-info/ink-contracts#l1-testnet-contracts-sepolia
+  static readonly inkSepoliaConfig: RollupDeployment<OPFaultConfig> = {
+    chain1: CHAINS.SEPOLIA,
+    chain2: CHAINS.INK_SEPOLIA,
+    OptimismPortal: '0x5c1d29C6c9C8b0800692acC95D700bcb4966A1d7',
+    GameFinder: GAME_FINDER_SEPOLIA,
+  };
+
   // 20240917: delayed constructor not needed
   readonly OptimismPortal: Contract;
   readonly GameFinder: Contract;
diff --git a/src/utils.ts b/src/utils.ts
index f62e28fb..f1200de5 100755
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -11,6 +11,7 @@ export const NULL_CODE_HASH = keccakStr('');
 
 export const EVM_BLOCKHASH_DEPTH = 256;
 
+// TODO: make this a function of Chain
 export const MAINNET_BLOCK_SEC = 12;
 
 export const LATEST_BLOCK_TAG = 'latest';
diff --git a/src/zksync/ZKSyncRollup.ts b/src/zksync/ZKSyncRollup.ts
index 686fbb06..eedaff9e 100755
--- a/src/zksync/ZKSyncRollup.ts
+++ b/src/zksync/ZKSyncRollup.ts
@@ -38,11 +38,22 @@ export class ZKSyncRollup extends AbstractRollup<ZKSyncCommit> {
     chain2: CHAINS.ZKSYNC,
     DiamondProxy: '0x32400084c286cf3e17e7b677ea9583e60a000324',
   };
-
   static readonly sepoliaConfig: RollupDeployment<ZKSyncConfig> = {
     chain1: CHAINS.SEPOLIA,
     chain2: CHAINS.ZKSYNC_SEPOLIA,
-    DiamondProxy: '0x9a6de0f62Aa270A8bCB1e2610078650D539B1Ef9',
+    DiamondProxy: '0x9A6DE0f62Aa270A8bCB1e2610078650D539B1Ef9',
+  };
+
+  // https://docs.zero.network/main-features/system-contracts#zer%CE%B8-network
+  static readonly zeroMainnetConfig: RollupDeployment<ZKSyncConfig> = {
+    chain1: CHAINS.MAINNET,
+    chain2: CHAINS.ZERO,
+    DiamondProxy: '0xdbD849acC6bA61F461CB8A41BBaeE2D673CA02d9',
+  };
+  static readonly zeroSepoliaConfig: RollupDeployment<ZKSyncConfig> = {
+    chain1: CHAINS.SEPOLIA,
+    chain2: CHAINS.ZERO_SEPOLIA,
+    DiamondProxy: '0x9A62B01fFa3bD358d03508ef60bB522ABA5d1bEb',
   };
 
   readonly DiamondProxy: Contract;
diff --git a/test/gateway/common.ts b/test/gateway/common.ts
index 155e3eb8..af19594b 100755
--- a/test/gateway/common.ts
+++ b/test/gateway/common.ts
@@ -20,6 +20,10 @@ import {
   ScrollRollup,
 } from '../../src/scroll/ScrollRollup.js';
 import { type LineaConfig, LineaRollup } from '../../src/linea/LineaRollup.js';
+import {
+  type ZKSyncConfig,
+  ZKSyncRollup,
+} from '../../src/zksync/ZKSyncRollup.js';
 import { EthSelfRollup } from '../../src/eth/EthSelfRollup.js';
 import { TrustedRollup } from '../../src/TrustedRollup.js';
 import { EthProver } from '../../src/eth/EthProver.js';
@@ -271,3 +275,33 @@ export function testLinea(
     await setupTests(verifier, opts);
   });
 }
+
+export function testZKSync(
+  config: RollupDeployment<ZKSyncConfig>,
+  opts: TestOptions
+) {
+  describe.skipIf(shouldSkip(opts))(testName(config), async () => {
+    const rollup = new ZKSyncRollup(createProviderPair(config), config);
+    const foundry = await Foundry.launch({
+      fork: providerURL(config.chain1),
+      infoLog: !!opts.log,
+      infiniteCallGas: true, // Blake2s is ~12m gas per proof!
+    });
+    afterAll(foundry.shutdown);
+    const gateway = new Gateway(rollup);
+    const ccip = await serve(gateway, { protocol: 'raw', log: !!opts.log });
+    afterAll(ccip.shutdown);
+    const GatewayVM = await foundry.deploy({ file: 'GatewayVM' });
+    const ZKSyncSMT = await foundry.deploy({ file: 'ZKSyncSMT' });
+    const hooks = await foundry.deploy({
+      file: 'ZKSyncVerifierHooks',
+      args: [ZKSyncSMT],
+    });
+    const verifier = await foundry.deploy({
+      file: 'ZKSyncVerifier',
+      args: [[ccip.endpoint], rollup.defaultWindow, hooks, rollup.DiamondProxy],
+      libs: { GatewayVM },
+    });
+    await setupTests(verifier, opts);
+  });
+}
diff --git a/test/gateway/ink-sepolia.test.ts b/test/gateway/ink-sepolia.test.ts
new file mode 100755
index 00000000..01436c7d
--- /dev/null
+++ b/test/gateway/ink-sepolia.test.ts
@@ -0,0 +1,10 @@
+import { OPFaultRollup } from '../../src/op/OPFaultRollup.js';
+import { testOPFault } from './common.js';
+
+testOPFault(OPFaultRollup.inkSepoliaConfig, {
+  // https://explorer-sepolia.inkonchain.com/address/0x0d3e01829E8364DeC0e7475ca06B5c73dbA33ef6?tab=contract
+  slotDataContract: '0x0d3e01829E8364DeC0e7475ca06B5c73dbA33ef6',
+  // https://explorer-sepolia.inkonchain.com/address/0x57C2F437E0a5E155ced91a7A17bfc372C0aF7B05?tab=contract
+  slotDataPointer: '0x57C2F437E0a5E155ced91a7A17bfc372C0aF7B05',
+  skipCI: true,
+});
diff --git a/test/gateway/zero.test.ts b/test/gateway/zero.test.ts
new file mode 100755
index 00000000..b9afdfda
--- /dev/null
+++ b/test/gateway/zero.test.ts
@@ -0,0 +1,8 @@
+import { ZKSyncRollup } from '../../src/zksync/ZKSyncRollup.js';
+import { testZKSync } from './common.js';
+
+testZKSync(ZKSyncRollup.zeroMainnetConfig, {
+  // https://zerion-explorer.vercel.app/address/0x1Cd42904e173EA9f7BA05BbB685882Ea46969dEc#contract
+  slotDataContract: '0x1Cd42904e173EA9f7BA05BbB685882Ea46969dEc',
+  skipCI: true,
+});
diff --git a/test/gateway/zksync-sepolia.test.ts b/test/gateway/zksync-sepolia.test.ts
new file mode 100755
index 00000000..09103982
--- /dev/null
+++ b/test/gateway/zksync-sepolia.test.ts
@@ -0,0 +1,10 @@
+import { ZKSyncRollup } from '../../src/zksync/ZKSyncRollup.js';
+import { testZKSync } from './common.js';
+
+testZKSync(ZKSyncRollup.sepoliaConfig, {
+  // https://sepolia.explorer.zksync.io/address/0x1Cd42904e173EA9f7BA05BbB685882Ea46969dEc#contract
+  slotDataContract: '0x1Cd42904e173EA9f7BA05BbB685882Ea46969dEc',
+  // https://sepolia.explorer.zksync.io/address/0x8D42501ADE3d0D02033B7FB6FfEa338828a1A467
+  slotDataPointer: '0x8D42501ADE3d0D02033B7FB6FfEa338828a1A467',
+  skipCI: true,
+});
diff --git a/test/gateway/zksync.test.ts b/test/gateway/zksync.test.ts
index 592479f6..4076ad91 100755
--- a/test/gateway/zksync.test.ts
+++ b/test/gateway/zksync.test.ts
@@ -1,37 +1,10 @@
 import { ZKSyncRollup } from '../../src/zksync/ZKSyncRollup.js';
-import { Gateway } from '../../src/gateway.js';
-import { serve } from '@resolverworks/ezccip/serve';
-import { Foundry } from '@adraffy/blocksmith';
-import { createProviderPair, providerURL } from '../providers.js';
-import { setupTests, testName } from './common.js';
-import { describe } from '../bun-describe-fix.js';
-import { afterAll } from 'bun:test';
+import { testZKSync } from './common.js';
 
-const config = ZKSyncRollup.mainnetConfig;
-describe(testName(config), async () => {
-  const rollup = new ZKSyncRollup(createProviderPair(config), config);
-  const foundry = await Foundry.launch({
-    fork: providerURL(config.chain1),
-    infoLog: false,
-    infiniteCallGas: true, // Blake2s is ~12m gas per proof!
-  });
-  afterAll(foundry.shutdown);
-  const gateway = new Gateway(rollup);
-  const ccip = await serve(gateway, { protocol: 'raw', log: false });
-  afterAll(ccip.shutdown);
-  const GatewayVM = await foundry.deploy({ file: 'GatewayVM' });
-  const ZKSyncSMT = await foundry.deploy({ file: 'ZKSyncSMT' });
-  const hooks = await foundry.deploy({
-    file: 'ZKSyncVerifierHooks',
-    args: [ZKSyncSMT],
-  });
-  const verifier = await foundry.deploy({
-    file: 'ZKSyncVerifier',
-    args: [[ccip.endpoint], rollup.defaultWindow, hooks, rollup.DiamondProxy],
-    libs: { GatewayVM },
-  });
-  await setupTests(verifier, {
-    // https://explorer.zksync.io/address/0x1Cd42904e173EA9f7BA05BbB685882Ea46969dEc#contract
-    slotDataContract: '0x1Cd42904e173EA9f7BA05BbB685882Ea46969dEc',
-  });
+testZKSync(ZKSyncRollup.mainnetConfig, {
+  // https://explorer.zksync.io/address/0x1Cd42904e173EA9f7BA05BbB685882Ea46969dEc#contract
+  slotDataContract: '0x1Cd42904e173EA9f7BA05BbB685882Ea46969dEc',
+  // https://explorer.zksync.io/address/0x8D42501ADE3d0D02033B7FB6FfEa338828a1A467#contract
+  // TODO: enable this after batch 494047 is finalized
+  //slotDataPointer: '0x8D42501ADE3d0D02033B7FB6FfEa338828a1A467',
 });
diff --git a/test/providers.ts b/test/providers.ts
index 62102088..c263e39d 100755
--- a/test/providers.ts
+++ b/test/providers.ts
@@ -264,6 +264,20 @@ export const RPC_INFO = new Map<Chain, RPCInfo>(
         // wss://rpc.apechain.com/ws
         // https://apechain.calderachain.xyz/http
       },
+      // https://docs.zero.network/build-on-zero/network-information#zer%CE%B8-network
+      {
+        chain: CHAINS.ZERO,
+        rpc: 'https://rpc.zerion.io/v1/zero',
+      },
+      {
+        chain: CHAINS.ZERO_SEPOLIA,
+        rpc: 'https://rpc.zerion.io/v1/zero-sepolia',
+      },
+      // https://docs.inkonchain.com/quick-start/get-connected
+      {
+        chain: CHAINS.INK_SEPOLIA,
+        rpc: 'https://rpc-qnd-sepolia.inkonchain.com', // wss://rpc-qnd-sepolia.inkonchain.com
+      },
     ] satisfies RPCInfo[]
   ).map((x) => [x.chain, x])
 );
diff --git a/test/rollup/trusted.ts b/test/rollup/trusted.ts
index 86244c9b..4d7be3d9 100755
--- a/test/rollup/trusted.ts
+++ b/test/rollup/trusted.ts
@@ -1,7 +1,7 @@
 import { randomBytes, SigningKey } from 'ethers/crypto';
 import { CHAINS } from '../../src/chains.js';
 import { TrustedRollup } from '../../src/TrustedRollup.js';
-import { EthProver } from '../../src/index.js';
+import { EthProver } from '../../src/eth/EthProver.js';
 import { createProvider } from '../providers.js';
 
 const rollup = new TrustedRollup(
@@ -16,7 +16,7 @@ console.log({
   cacheMs: rollup.latest.cacheMs,
 });
 
-// there is only 1 commit, always index 0
+// there is only 1 commit
 const { prover: _, ...commit } = await rollup.fetchCommit(0n);
 
 console.log(commit);
diff --git a/test/workarounds/polygon-proof-retry.test.ts b/test/workarounds/polygon-proof-retry.test.ts
index 9c655ed5..b8743ce4 100755
--- a/test/workarounds/polygon-proof-retry.test.ts
+++ b/test/workarounds/polygon-proof-retry.test.ts
@@ -4,7 +4,7 @@ import { toPaddedHex } from '../../src/utils.js';
 import { test, expect, afterAll } from 'bun:test';
 import { describe } from '../bun-describe-fix.js';
 import { CHAINS } from '../../src/chains.js';
-import { EthProver } from '../../src/index.js';
+import { EthProver } from '../../src/eth/EthProver.js';
 import { Provider } from '../../src/types.js';
 
 describe.skipIf(!!process.env.IS_CI)('polygon eth_getProof retry', async () => {