diff --git a/.changeset/fix-validate-network.md b/.changeset/fix-validate-network.md
new file mode 100644
index 0000000..8030da2
--- /dev/null
+++ b/.changeset/fix-validate-network.md
@@ -0,0 +1,5 @@
+---
+"@satoshai/abi-cli": patch
+---
+
+Validate network parameter before fetch loop for fail-fast behavior
diff --git a/src/commands/fetch.ts b/src/commands/fetch.ts
index cd7c64c..d03a7a0 100644
--- a/src/commands/fetch.ts
+++ b/src/commands/fetch.ts
@@ -1,6 +1,7 @@
 import { defineCommand } from 'citty';
 import { parseContractId, fetchContractAbi } from '../fetcher.js';
 import { generateTypescript, generateJson, defaultFilename } from '../codegen.js';
+import { resolveNetwork } from '../network.js';
 import { writeFile } from 'node:fs/promises';
 import { resolve } from 'node:path';
 
@@ -44,6 +45,9 @@ export const fetchCommand = defineCommand({
       throw new Error(`Invalid format "${format}". Use "ts" or "json".`);
     }
 
+    // Validate network early to fail fast before fetching any contracts
+    resolveNetwork(args.network);
+
     const contractIds = args.contract.split(',').map((s) => s.trim());
 
     for (const contractId of contractIds) {