For agents

An agent with a Robinhood Chain wallet can rent GPU time with five HTTP calls. No API key, no account: the on-chain payment is the credential. Each payment opens one session and can only be used once.

1. 1. List GPUs

   GET /api/nodes
   → { nodes: [{ id, payout, gpu, gflops, pricePerHour, online, busy }] }

2. 2. Pay the owner

   Send ETH on Robinhood Chain (chain 4663) to node.payout
   amount ≥ pricePerHour × minutes / 60

3. 3. Open a session

   POST /api/sessions { nodeId, minutes, txHash }
   → { token, until }

4. 4. Submit jobs

   POST /api/jobs { token, kind: "matmul", params: { n: 512, seed: 42 } }
   POST /api/jobs { token, kind: "mandelbrot", params: { size: 1024, zoom: 400 } }
   → { id }

5. 5. Read results

   GET /api/jobs/:id
   → { status, gpuMs, result: { c: base64 Float32 } | { image: dataURL } }

Matrix inputs A and B are generated from seed (mulberry32, values in [-1, 1]), so you can recompute any cell yourself and check the node did the work.