Spawn an agent for 1 USDC. It gets its own wallet, an on-chain ERC-8004 identity,
and pays for every tool it uses in USDC over x402. No API keys. No subscriptions.
Website ·
Docs ·
Fuci Risk ·
Market ·
X ·
DefiLlama ·
$FUCI
Why Fuci
Most "AI agents" still need a human with a credit card and an API key. Fuci agents pay for themselves. Each one is a frond in a kelp forest on Arc, Circle's USDC chain:
- 🌿 Its own wallet. USDC on Arc. You set a daily limit; the agent can't go past it.
- 🪪 Its own identity. Registered in Arc's ERC-8004 Identity Registry, with a public card, reputation and validation history.
- 💸 Pays per call. Every tool answers
402 Payment Required with a price. The agent signs a USDC payment through Circle Gateway (gas-free, batched) and gets the data.
- 🤖 Works while you sleep. Scheduled reports, launch scouting and an Argus trading autopilot with take-profit, stop-loss and "sell when the dev sells".
Fuci is the plural of Fucus, a brown seaweed. Every agent is a frond; every payment grows the forest.
Any agent holding USDC, on Arc, Base, Arbitrum, Ethereum, Optimism, Polygon, Avalanche, Unichain, World Chain, Sonic, Sei or HyperEVM, can call these. No account, no key: call, read the price in the 402, pay, get JSON.
| Tool | Endpoint | Price | What you get |
|---|
| 🛡️ Risk Rating | GET /api/x402/risk?target= | $0.002 | An A–F risk grade for any Arc token or DeFi protocol, every factor sourced |
| 🚀 Argus Launch Scout | GET /api/x402/argus/launches | $0.001 | The newest token launches on Argus: creator, pool, taxes |
| 📈 Bonding Watcher | GET /api/x402/argus/bonding?token= | $0.002 | Price, bonding progress and recent trades for one token |
| 🌊 Tide Oracle | GET /api/x402/fucus/oracle | $0.0005 | Net USDC flow and market mood across new launches, in one sentence |
| 🧠 Ask the Fucus Agent | POST /api/agent/run | $0.04 | A written brief: the agent buys the tools above and answers your question |
curl -i https://www.fuci.family/api/x402/risk?target=morpho-blue
Machine-readable: /openapi.json (OpenAPI 3.1) · /.well-known/x402 · /llms.txt · /.well-known/agent-card.json
How a payment works
sequenceDiagram
autonumber
participant A as Your agent
participant F as Fuci tool
participant G as Circle Gateway
A->>F: GET /api/x402/risk?target=morpho-blue
F-->>A: 402 Payment Required (price, 12 networks, input schema)
A->>A: Sign a USDC authorization (EIP-712, no gas)
A->>F: Same request + payment signature
F->>G: Verify
F-->>A: 200 OK + the report
F->>G: Settle (batched, only if the tool succeeded)
If a tool fails, the payment is never settled. You only pay for answers.
Fuci Risk: know the risk before you put money in
A free A–F rating for any token on Arc or DeFi protocol, built from on-chain and public data only, explained in plain words, with a link to every source. No LLM guessing: when data is missing it says Unknown.
| For DeFi protocols | For tokens on Arc |
|---|
| Audits · security history (every hack, weighted by recency) · track record · TVL depth & stability · governance · yield sustainability (real fees vs emitted rewards) | Contract control (owner, proxy, mint, pause, blacklist) · launch terms · liquidity · holder concentration (replayed from every transfer) · age & activity |
Hard rules cap the grade no matter how good the rest looks: a token under a week old can't score above C, an owner that can mint can't score above D, a hack in the last year caps a protocol at C. Our own token gets no special treatment. Free for people at fuci.family/risk; agents pay 0.002 USDC per check.
Use Fuci from Claude, Cursor or any MCP client
Fuci is on the official MCP Registry as family.fuci.www/fuci and on Smithery.
{ "mcpServers": { "fuci": { "type": "http", "url": "https://www.fuci.family/api/mcp" } } }
Want the assistant to pay from your own wallet, with caps it can't change? Use the local client in mcp/:
{
"mcpServers": {
"fuci": {
"command": "npx",
"args": ["-y", "https://www.fuci.family/fuci-mcp.tgz"],
"env": { "FUCI_PRIVATE_KEY": "0x…", "FUCI_MAX_CALL": "0.01", "FUCI_DAILY": "1" }
}
}
}
An open market for paid APIs
 |  |
| Market. Every x402 API on Arc we can find, from every seller, checked live: it must answer 402 with an Arc price before it shows up. | Stats. Every number is read from Arc or from settled payments, with links to check it. Also as JSON at /api/stats/public. |
On-chain
The factory source is in contracts/FuciAgentFactory.sol. Fuci earns the 1 USDC creation fee and 1% of each autopilot trade, paid to the treasury; the fees are tracked on DefiLlama with the adapter in defillama/.
Everything inside
| Feature |
|---|
| 🌱 | Spawn wizard: an agent with a wallet, a strategy and an ERC-8004 identity in about a minute, plus a shareable card with its own OG image |
| 💳 | Card or bank onramp for people without crypto |
| 🧪 | Pay-per-prompt playground: watch 402 → sign → settle, step by step |
| ⏱️ | Automation: scheduled runs from the agent's own wallet, with a daily cap and auto-pause |
| 📊 | Trading autopilot on Argus through Uniswap V4: new launches after the snipe tax, bondings, limits, TP/SL, dev-sell exit |
| ⭐ | On-chain reputation and validation: visitors rate agents from their wallet; the Tide checker re-reads every claim from Arc at the recorded block |
| 🗂️ | Arc agent directory: every ERC-8004 agent on Arc, read live from the registry |
| 🛡️ | Fuci Risk, Fuci Market and Stats, as above |
| 🌗 | Bioluminescent (dark) and Tidepool (light) themes, mobile first |
Stack: Next.js 16 · Tailwind 4 · viem · @x402/next · @x402/extensions (Bazaar) · @circle-fin/x402-batching (Circle Gateway) · Circle Wallets · Upstash Redis · Claude (optional) · Remotion for the videos.
Run it yourself
git clone https://github.com/fucidotfamily/fuci_family.git && cd fuci_family
npm install
cp .env.example .env.local
npm run dev
Then open /setup to connect a wallet and create the house agent. Deploying is one click on Vercel: import your fork, then follow the steps below.
Configure it (Arc Mainnet, real USDC)
Everything on the site is real: Argus launches are read straight from Arc Mainnet, x402 payments use real USDC through Circle Gateway, and stats only count real payments. There is no sample data.
Circle Gateway nanopayments are permissionless: the house agent is a plain wallet key, and payments go to your own wallet, so no Circle account or API key is needed.
-
Open https://www.fuci.family/setup.
- Step 1: connect your wallet (e.g. Rabby) and add its address in Vercel as
FUCI_SELLER_ADDRESS. It receives payments and signs you in to /setup.
- Step 2: click Generate agent key (generated in your browser) and add it in Vercel as
AGENT_PRIVATE_KEY.
-
Make sure Upstash Redis is connected (Vercel → Storage).
-
Redeploy.
-
Back on /setup, Sign in with wallet. Send a little USDC on Arc to the agent address (USDC is Arc's gas too), then click Deposit to Gateway. x402 payments are drawn from the Gateway balance.
-
Check https://www.fuci.family/api/health. When every check is ok: true, the site is live.
-
On /setup, Step 4: Register house agent mints its ERC-8004 identity (a little USDC gas from the agent wallet), and Send 0.05 USDC to validator funds the Tide checker. For the job board, send the agent address free testnet USDC from faucet.circle.com (network: Arc Testnet).
Circle Wallets (CIRCLE_API_KEY + CIRCLE_ENTITY_SECRET) are still supported as an alternative agent wallet once your Circle account has mainnet access.
Optional:
| Variable | Purpose |
|---|
NEXT_PUBLIC_CIRCLE_CLIENT_KEY | Passkey login on /spawn (Circle console → Modular Wallets). Browser wallets (MetaMask/Rabby) always work |
FUCI_SELLER_ADDRESS | Your own wallet to receive payments. Empty = the automatic treasury wallet |
NEXT_PUBLIC_FUCI_TOKEN | Override the $FUCI token address (defaults to the live Argus token) |
NEXT_PUBLIC_TITHE_ADDRESS | Kelp restoration tithe wallet (5%) |
PLAYGROUND_DAILY_USDC | USDC per day the house agent spends sponsoring the playground (default 0.25) |
QSTASH_TOKEN | One-click scheduler for agent automation (every 5 min) |
AGENT_WALLET_SECRET | Encrypts agent wallets (defaults to a key derived from AGENT_PRIVATE_KEY) |
CRON_SECRET | Lets Vercel's daily cron call the automation tick |
X_CLIENT_ID / X_CLIENT_SECRET | "Connect X" on agent cards. Create an app at developer.x.com: OAuth 2.0, type "Web App" (confidential), callback https://www.fuci.family/api/x/callback, scopes users.read tweet.read |
ANTHROPIC_API_KEY | Optional. When set, Claude writes the agent's answers; otherwise they are built from the data |
ARGUS_RPC_URL | Private Arc Mainnet RPC, if the public ones rate-limit you (FOCI_RPC_URL still works) |
NEXT_PUBLIC_ARC_NETWORK=testnet | Switch to Arc Testnet for trials |
Check it: once the agent is set up, curl -i localhost:3000/api/x402/argus/launches returns 402 Payment Required with real Arc payment requirements.
Automation: agents that run and pay by themselves
An agent's owner can switch on Automation on the agent page: pick how often (5 min to 1 day), what to do (Launch Scout, Graduation Watcher, Tide Oracle), an optional focus and a max USDC per day. Every change is signed by the owner's wallet, once; after that the agent runs with no further signatures.
- Its own wallet. Switching automation on creates a wallet for that agent. The key is generated on the server and stored encrypted (AES-256-GCM) in Redis, derived from
AGENT_WALLET_SECRET or, if unset, AGENT_PRIVATE_KEY. Changing that secret makes existing agent wallets unreadable, so withdraw first. This is custodial: meant for small balances.
- Funding. The owner clicks Fund (USDC on Arc from their wallet to the agent's). Before a run, the agent moves what it needs into Circle Gateway itself, then pays each tool over x402 with its own key.
- Limits. Never above the daily max; an empty wallet just waits; three failed runs in a row pause it.
- Withdraw sends the Gateway balance and the wallet's USDC (minus a little gas) back to the owner.
- Results go to the agent's History with tx links.
Scheduler (Vercel Hobby runs its own cron only once a day): the tick is POST /api/automation/tick with Authorization: Bearer <tick secret> (both shown on /setup, step 5). Either add QSTASH_TOKEN (Upstash console → QStash) and click Start scheduler, or paste the URL and header into any cron service to call it every 5 minutes. vercel.json also runs it once a day; set CRON_SECRET in Vercel for that call to be accepted.
Repo map
| Folder | What it holds |
|---|
app/ | Next.js pages and API routes: x402 tools, MCP, risk, market, setup, agents |
components/ | React UI |
lib/ | Arc, Argus, x402, ERC-8004, risk engine, wallets, trading, storage |
contracts/ | FuciAgentFactory.sol (npm run contracts:build) |
mcp/ | MCP client that pays from your own wallet (npm run mcp:pack) |
defillama/ | DefiLlama fees adapter |
video/ | Remotion launch videos (see video/README.md) |
listings/ | MCP Registry and directory metadata |
public/ | Brand assets |
Notes
- Everything is real: Argus launches are read from Arc Mainnet, payments are real USDC, and stats only count settled payments. There is no sample data.
- Argus addresses and events come from Argus' docs and are checked against mainnet (
lib/argus.ts).
- The Tide checker is Fuci's own validator, so treat its scores as Fuci checking its own work in public: anyone can re-run the checks from
/api/runs/<hash>.
- Agent outputs and risk grades describe measurable signals. They are not financial advice.
Contributing and security
Issues and pull requests are welcome: see CONTRIBUTING.md. Found a vulnerability? Please follow SECURITY.md instead of opening a public issue. Never commit .env files or keys.
MIT © 2026 Fuci · built on Arc with Circle Gateway · fuci.family