{"id":"9c62abbe-2186-487c-b77a-620ed8769006","shortId":"Udga6e","kind":"x402","title":"Extract the 4-byte function selector from calldata hex — call when reading the 4-byte selector from calldata","tagline":"Extract the 4-byte function selector from calldata hex — call when reading the 4-byte selector from calldata. Use for ch","description":"Extract the 4-byte function selector from calldata hex — call when reading the 4-byte selector from calldata. Use for chain input hygiene without live RPC—adjacent to OneSource-class small chain reads, but static/local only so rights and margin stay clear. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. 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