Wallet compatibility matrix
MetaMask, Rabby, WC
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Case Study
Wallet and RPC Compatibility: EVM edge cases
MetaMask, Rabby, signing flows, JSON-RPC correctness. One broken edge breaks the product.
8Wallet providers supported
0Support tickets after launch
8
Wallet providers supported
0
Support tickets after launch
Year: 2025Industry: Web3 / DeFiTimeline: 5 weeks
Problem
EVM dApp failed for a significant share of users: MetaMask worked, Rabby and others threw silent failures or wrong signing results. RPC responses differed by provider. No single test suite covered wallet + RPC matrix.
Constraints
- •Support MetaMask, Rabby, WalletConnect, injected wallets
- •Correct handling of eth_sign vs personal_sign vs EIP-712
- •JSON-RPC must match spec (chainId, gas, nonce edge cases)
- •No user-facing errors on unsupported chains
Solution
Built a wallet compatibility matrix and RPC correctness checklist. Wrapped signing in a single abstraction with fallbacks per wallet type. Added provider-agnostic JSON-RPC tests (including error payloads). Documented edge cases and added E2E for MetaMask + Rabby on two chains.
Deliverables
- Wallet abstraction layer (sign, send, switchChain)
- RPC correctness test suite (request/response + errors)
- Compatibility matrix: MetaMask, Rabby, WalletConnect
- E2E scenarios for main wallets on testnet/mainnet
- Runbook for new wallet onboarding
Artifacts
Documents and deliverables from the project
RPC correctness suite
JSON-RPC tests
Onboarding runbook
New wallets
Verification / Quality gates
6-phase checklist before release
01Build
02Wallet abstraction tests
03RPC correctness suite
04MetaMask E2E
05Rabby E2E
06WalletConnect E2E
All gates passed
6/6
Tech stack
TypeScriptethers.jsviemPlaywrightHardhat
Outcome
Zero wallet-related support tickets after rollout. Rabby and MetaMask both pass full flow. New wallet added in 1 day using runbook.
Hard parts we solved
Signing method divergence
eth_sign deprecated, personal_sign and EIP-712 differ by wallet. We normalized to a single API and mapped per wallet under the hood.
JSON-RPC correctness
Some providers return extra fields or wrong error codes. We asserted on a minimal compliant subset and documented known deviations. Built a normalization layer that strips non-standard fields, coerces hex values to consistent casing, and maps provider-specific error codes to our internal error taxonomy — so the application layer never sees raw provider quirks.
Automated Cross-Wallet Regression Suite
Manual testing across 8 wallets × 3 networks × 4 signing methods = 96 combinations per release. We built a Playwright-based test harness that automates wallet interactions via browser extension injection: MetaMask and Rabby are installed as unpacked extensions, test scripts programmatically approve transactions and sign messages, and assertion checks verify the on-chain result matches the expected state. The suite runs in CI on every PR and catches regressions that manual QA would miss — like Rabby silently changing its EIP-712 domain separator encoding in a minor update, which would have broken typed data signing for 15% of users.
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