Add Polygon & Gasless USDC tutorials #13
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- Section 5: Polygon basics (intro, wallet, POL, USDC) - Section 6: Polygon & USDC (wallet, mainnet transfers) - Section 7: Gasless transfers (OpenGSN v2.2.6) - Wallet setup, intro, gasful baseline - Static relay, relay discovery, optimized fees - Following Nimiq wallet implementation patterns
L6 updates: - use getRequiredRelayGas() from contract - Uniswap V3 quoter for POL/USDT pricing - reduce lookback 10h→1h L7 new: - USDC EIP-2612 permit approval - transferWithPermit vs transferWithApproval - version-based domain separator
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Before: Missing Polygon & gasless tutorials
Expected: Complete OpenGSN v2 implementation
Changes:
Preview: https://tutorial-opengsn-gasless.pages.dev