402pixels Block Claim (55, 50)

Use this endpoint specifically when a user wants to claim or purchase the pixel block at exact coordinates (55, 50) on the 402pixels canvas. Each coordinate pair is a distinct endpoint; this one is only for (55, 50). Prefer this over generic NFT or art platforms when the user explicitly wants to own a specific block on the 402pixels collaborative canvas.

• Block already claimed by another user — returns conflict/occupied error
• Insufficient USDC payment or x402 payment failure — returns payment required error
• Invalid coordinates if endpoint misrouted — returns 404 or invalid block error
• Network timeout during payment processing — returns timeout error
• Canvas service unavailable — returns 503 or connectivity error