feat(worker): add Etherscan API proxy for free contract verification#330
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AugustoL merged 2 commits intoopenscan-explorer:devfrom Mar 19, 2026
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Add /etherscan/verify route to the Cloudflare Worker that proxies contract verification requests to Etherscan V2 API using a shared API key. Frontend now uses the worker proxy as default fallback when no user key is configured, making verification free for all users. Closes openscan-explorer#322
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Remove hasEtherscanKey gate from useContractVerification so that Etherscan verification runs for all users via the worker proxy, not just those with a configured API key.
MatiasOS
approved these changes
Mar 19, 2026
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Description
Add an Etherscan V2 API proxy to the existing Cloudflare Worker so that contract verification lookups work for all users out of the box, without requiring them to configure their own API key.
Related Issue
Closes #322
Type of Change
Changes Made
Worker (
worker/)POST /etherscan/verify— Proxies contract verification requests to Etherscan V2 API using a shared API key stored as a Worker secretchainId(positive integer) andaddress(0x + 40 hex chars)ETHERSCAN_API_KEYsecret — Set viawrangler secret put ETHERSCAN_API_KEYFrontend (
src/)contractLookup.ts— Etherscan fallback now always runs: uses user key if configured, otherwise proxies through the OpenScan WorkeruseEtherscan.ts— Same logic: no longer requiresapiKeyto activate, uses worker proxy as defaultScreenshots (if applicable)
N/A — backend change, verification results appear in existing contract UI
Checklist
npm run format:fixandnpm run lint:fixnpm run typecheckwith no errorsAdditional Notes
wrangler secret put ETHERSCAN_API_KEY