Robinhood Chain KOL Signals in Your AI Agent: Pay Per Call with x402 and USDG

A working walkthrough: have an AI agent buy live Robinhood Chain KOL trade signals per call, paying in USDG via x402 — no API key, no signup. About 30 lines with viem and fetch.

MadeOnSol·July 22, 2026· 4 min read

Robinhood Chain KOL Signals in Your AI Agent: Pay Per Call with x402 and USDG

Building a product on Solana data?

Skip the Geyser pipeline — embed KOL flow, deployer reputation, and the all-DEX firehose over REST, WebSocket, or webhooks. The Business tier (€400/mo) is the self-serve embed license at 500k calls/day — Enterprise adds white-label & redistribution.

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Capital-efficient Solana DEX with weighted and stable AMM pools

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Peer-to-peer perpetual futures DEX on Solana with customizable trading pairs

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import { MadeOnSol } from "madeonsol";

// Get a free API key at madeonsol.com/pricing
const client = new MadeOnSol({ apiKey: "msk_your_key" });

const { trades } = await client.kol.feed({ limit: 10 });
const { alerts } = await client.deployer.alerts({ limit: 5 });
const { tools } = await client.tools.search({ q: "trading" });

npm install madeonsolFull API docs

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Guides

Robinhood Chain x402 Starter: Clone, Run, and Pay for RHC Data in USDG

A minimal starter repo that pays a MadeOnSol Robinhood Chain endpoint per call in USDG via x402 — clone it, drop in a wallet key, and you're querying live KOL data in a minute. No API key.

2 minJuly 22, 2026

Guides

Does x402 Only Work with USDC? USDG, EIP-3009 and Robinhood Chain Explained

A common myth says x402 payments only work with USDC. They don't. USDG (Global Dollar) implements EIP-3009, so it works with x402 today — and it settles natively on Robinhood Chain. Here's why, with the on-chain details.

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The flow

Every MadeOnSol Robinhood Chain endpoint answers an unpaid request with 402 Payment Required and a challenge listing its payment options. To pay the USDG leg, you sign an EIP-3009 transferWithAuthorization — an off-chain signature — and retry the request with it attached. The facilitator settles it on-chain and returns the data.

The code

import { privateKeyToAccount } from "viem/accounts"; import { getAddress } from "viem"; const account = privateKeyToAccount(process.env.PRIVATE_KEY); const BASE = "https://madeonsol.com"; const EP = "/api/x402/rhc/kol/feed?limit=5"; // USDG on Robinhood Chain — the EIP-712 domain the payer signs against. const domain = { name: "Global Dollar", version: "1", chainId: 4663, verifyingContract: "0x5fc5360d0400a0fd4f2af552add042d716f1d168" }; const types = { TransferWithAuthorization: [ { name: "from", type: "address" }, { name: "to", type: "address" }, { name: "value", type: "uint256" }, { name: "validAfter", type: "uint256" }, { name: "validBefore", type: "uint256" }, { name: "nonce", type: "bytes32" } ] }; // 1. Unpaid request -> 402 challenge const challenge = await (await fetch(BASE + EP)).json(); const leg = challenge.accepts.find((a) => a.network === "eip155:4663"); // 2. Sign the EIP-3009 authorization for the USDG leg const now = Math.floor(Date.now() / 1000); const nonce = "0x" + Buffer.from(crypto.getRandomValues(new Uint8Array(32))).toString("hex"); const message = { from: account.address, to: getAddress(leg.payTo), value: BigInt(leg.amount), validAfter: 0n, validBefore: BigInt(now + 300), nonce }; const signature = await account.signTypedData({ domain, types, primaryType: "TransferWithAuthorization", message }); // 3. Retry with the payment -> data const payload = { x402Version: 2, scheme: "exact", network: "eip155:4663", payload: { signature, authorization: { ...message, value: String(leg.amount), validAfter: "0", validBefore: String(now + 300) } } }; const res = await fetch(BASE + EP, { headers: { "PAYMENT-SIGNATURE": Buffer.from(JSON.stringify(payload)).toString("base64") } }); console.log(await res.json()); // live Robinhood Chain KOL trades

Run it and you get the live feed back — real trades from tracked Robinhood Chain KOL wallets, each enriched with market cap and deployer tier, exactly as the keyed /api/v1/rhc/kol/feed returns it. The PAYMENT-RESPONSE header carries the on-chain settlement transaction.

Robinhood Chain KOL Signals in Your AI Agent: Pay Per Call with x402 and USDG

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What you need

The flow

The code

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