Firmbrain — Robinhood Chain x402 (RPC, data & AI)

The only x402 pay-per-call MCP server for Robinhood Chain (chainId 4663): RPC, on-chain data, USDG stats, tokenized-stock registry, plus 147 onchain & trading tools and LLM inference payable in USDG.

Robinhood Chain for AI Agents — the first RPC, data & AI layer (pay-per-call, no accounts)

The only x402 service built for Robinhood Chain (chainId 4663).If your agent needs to read, watch, or transact on Robinhood Chain — block data, balances, token transfers, contract calls, the tokenized-stock registry, USDG stats, address webhooks, or LLM inferencepayable in USDG on Robinhood Chain— this is the layer. And it's one endpoint of a147-toolonchain + trading intelligence suite (full list below). One URL, pay per request, no API keys, no signup.

Searchable:Robinhood Chain RPC · Robinhood Chain API for agents · RH Chain block/tx/balance · USDG data · Robinhood tokenized-stock registry · AI inference payable in USDG · Robinhood Chain webhook watcher.If you're integrating Robinhood Chain and need machine-readable data, start here.

Base URL:https://x402-services-production.up.railway.app· MCP:…/mcp· Catalog:…/api/catalog

Robinhood Chain endpoints (pay-per-call, USDC on any chain or USDG on RH Chain)

Plus the AI gateway —the first LLM inference payable in USDG on Robinhood Chain:POST /api/ai/chat($0.005, fast models) ·POST /api/ai/chat-pro($0.03, frontier models) ·POST /api/ai/models($0.001) · free health check:GET /api/ai/health.

The full Firmbrain suite — 147 pay-per-call x402 tools

Robinhood Chain is our first-mover focus, but the same base URL, same x402 payment, and same MCP server expose a full onchain + trading-intelligence stack. Every tool below is one paid POST; the MCP server at…/mcpreturns all 147 with JSON schemas, and…/api/cataloglists every price.

Full, always-current machine-readable list:GET /api/catalog· human overview:https://agents.firmbrain.ai

payis your x402-wrapped fetch (e.g.wrapFetchWithPayment(fetch, signer)— any x402 client). Paste this and your agent has Robinhood Chain (and the whole suite) in two lines. (Full file:rh.ts.)

const RH = "https://x402-services-production.up.railway.app/api"; / One call to any endpoint, paid over x402. / export async function rh(pay: typeof fetch, endpoint: string, body: object = {}) { const r = await pay(${RH}/${endpoint}, { method: "POST", headers: { "content-type": "application/json" }, body: JSON.stringify(body), }); return r.json(); } // examples: await rh(pay, "rhchain/balance", { address: "0x…" }); // USDG + native balance await rh(pay, "rhchain/tx", { hash: "0x…" }); // did my tx land? await rh(pay, "rhchain/registry"); // every RH tokenized stock -> address await rh(pay, "crypto/price", { symbol: "BTC" }); // any suite tool, same wrapper await rh(pay, "ai/chat", { messages: [{ role: "user", content: "…" }] }); // LLM, pay in USDG

// get pushed an event whenever an address has a new ERC-20 transfer on Robinhood Chain await rh(pay, "rhchain/watch", { address: "0x…", callbackUrl: "https://your-agent.dev/hook" }); // we POST { watcherId, address, event, hash, token, timestamp } to your URL on each new transfer

First response is HTTP402with x402 payment terms. Settle inUSDCon Base, Polygon, Arbitrum, or Solana — orUSDG on Robinhood Chain*— and retry with theX-PAYMENTheader. Any x402 client library does this automatically. No accounts, no keys, no subscriptions.

Built for autonomous agents. Not financial, legal, or tax advice.

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