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
Deploying with
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| Status | Name | Latest Commit | Updated (UTC) |
|---|---|---|---|
| 🔵 In progress View logs |
tutorials | f4b9177 | Dec 16 2025, 04:36 PM |
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todo 
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- remove @cashlink references - update relay URL to polygon-relay.fastspot.io - fix imports and lint errors
- TypedRequestData: use chainId as number, clean EIP712Domain - Buffer: 20% mainnet (not 10%), remove double-buffer on fee - LOOKBACK_BLOCKS: 1800 (matches ~1hr at 30 blocks/min) - Gas limit: 300000 (from cash.link) - USDC ABI: transferWithPermit 5th param is value not deadline - Sync _files scaffolds with solution fixes
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Before: Missing Polygon & gasless tutorials
Expected: Complete OpenGSN v2 implementation
Changes:
Preview: https://tutorial-opengsn-gasless.pages.dev
TODO
@cashlink