Penrose docs.

A triangle is one coin launched on flap (BNB Chain), Pons (Robinhood Chain) and pump.fun (Solana) in the same minute. The engine keeps stock of the coin on every chain. When one chain trades more than 3% above another, it sells there and buys on the cheap chain, then spends the profit buying the corner with the smallest market cap. No bridging per trade; stock is rebalanced across chains from time to time through Relay.

Launch and trading costs are shown in the flow before you sign. Your keys stay in your wallets: one EVM wallet for BNB Chain and Robinhood Chain, one Solana wallet for the third corner.

API

JSON over HTTPS at https://api.penrose-triangle.xyz. Reads are open; launches are signed by the creator's wallet.

curl https://api.penrose-triangle.xyz/triangles/tess

{
  "id": "tess", "ticker": "TESS", "spread": 2.6, "band": 3,
  "legs": {
    "bsc": { "pad": "flap",     "price": 0.001652, "mcap": 1652000 },
    "rh":  { "pad": "pons",     "price": 0.001611, "mcap": 1611000 },
    "sol": { "pad": "pump.fun", "price": 0.001598, "mcap": 1598000 }
  },
  "weakest": "sol"
}

MCP

Give any agent the triangle. Add the server, then ask in plain words: "launch Tess on all three chains" or "which corner is cheapest right now".

{
  "mcpServers": {
    "penrose": { "url": "https://api.penrose-triangle.xyz/mcp" }
  }
}

tools: list_triangles, get_triangle, quote,
       launch_triangle, list_arbs, list_contracts

SDK

One file, no install. Works in Node and the browser.

import { penrose } from 'https://api.penrose-triangle.xyz/sdk.mjs';

const t = await penrose.triangle('tess');
console.log(t.spread, t.weakest);       // 2.6 'sol'

for await (const arb of penrose.arbs('tess')) {
  console.log(arb.sell, '->', arb.buy, arb.profit);
}