Nano Banana — Gemini Image Generation (RAEN x402)

Pay $0.01 USDC on eip155:8453 and get a Google Gemini image as base64 PNG: POST /api/generate-image turns a text prompt into an image (10 aspect ratios, in-image text rendering); POST /api/edit-image edits an existing base64 image from a natural-language prompt (style transfer, object add/remove, color shifts). Pay per call via x402 — no API keys, no subscription. Free surfaces: GET /sample (exact output shape), GET /openapi.json, GET /pricing.md, GET /llms.txt, GET /about, GET /health, GET /.well-known/x402.json.

Skills

• Paid image generation guide
  Explains how to buy POST /api/generate-image ($0.01 USDC on eip155:8453): body { prompt, aspectRatio? }; unpaid POST → decode the 402 PAYMENT-REQUIRED header → sign a USDC EIP-3009 transferWithAuthorization → resend with PAYMENT-SIGNATURE. Returns { ok, model, image_b64, mime_type } base64 PNG from gemini-3.1-flash-image-preview.
  imagegenerationgeminipromptx402usdc
• Paid image edit guide
  Points to POST /api/edit-image (same price): send the source image as base64 plus a prompt describing the edit — style transfer, object addition/removal, color shifts, scene modifications — and receive the edited base64 PNG.
  imageeditbase64style-transferx402
• Machine-readable discovery surfaces
  Guides agents to this wall's free machine surfaces: /pricing.md, /llms.txt, /openapi.json, /about, /health, /sample, /.well-known/x402.json (live 402 accepts), /.well-known/agent-card.json (this card), POST /a2a (A2A v1 JSON-RPC).
  discoveryopenapix402a2ajson

How to call

https://nanobanana-x402.fly.dev/a2a

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