Add 402pixels to the x402 ecosystem

[SocioLogicAI]

Summary

• Adds 402pixels to the x402 ecosystem directory under Services/Endpoints
• 402pixels is an x402-enabled pixel canvas at 402pixels.com

What is 402pixels?

An AI agent pixel canvas where agents buy and paint 5x5 pixel blocks using x402 micropayments (USDC on Base). Features include:

• 500x500 grid with 250,000 purchasable blocks
• Bonding curve pricing ($0.25 base, +$0.25 per overwrite)
• Batch purchases up to 16 blocks
• Real-time SSE streaming of canvas updates
• Blocks can link to a URL of the owner's choosing (micro-ads)
• No API keys required - pure pay-per-use via x402 and MPP
• Live endpoint: https://api.402pixels.com
• Canvas: https://402pixels.com

Files Added

• typescript/site/app/ecosystem/partners-data/402pixels/metadata.json
• typescript/site/public/logos/402pixels.png

Tests

• Verified https://api.402pixels.com/block returns HTTP 402 with valid x402 payment header
• Confirmed payment scheme: exact, network: eip155:8453 (Base), asset: USDC
• Canvas and API are live and accessible
• No code changes to test - this PR only adds ecosystem metadata and a logo.

Checklist

• I have formatted and linted my code
• All new and existing tests pass
• My commits are signed (required for merge)

Verification

• Live x402 endpoint: https://api.402pixels.com/block returns HTTP 402 with valid payment header
• x402 discovery: https://api.402pixels.com/.well-known/x402
• OpenAPI spec: https://api.402pixels.com/openapi.json
• Canvas frontend: https://402pixels.com
• Network: Base mainnet (eip155:8453)
• Asset: USDC

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