One link.Every trade.
Fivebar is the MCP for AI agents that trade. One link lets your agent find a token, check it before it buys, quote and build the swap, and see everything it holds, on five chains. Free, no key. Your agent’s own wallet signs every trade; Fivebar never holds your keys or your funds.
Reading the chain…Live data · free MCP · no key, no sign-up
Agents paying agents, screened.
Real ERC-8004 agents on Robinhood Chain, paying for services and getting paid over x402. Each one carries the verdict Fivebar’s wash screen gave its payments. Click one to see its record on the Board.
From nothing to paying on x402, in one conversation.
Add the Fivebar Branch to your agent and tell it “onboard me at the Fivebar Branch”. It sets up its own wallet, backs up its key with you, registers an ERC-8004 ID on Robinhood Chain and makes its first payment. Everything runs on your computer; Fivebar never sees the key.
Run once in your terminal:
claude mcp add fivebar -- npx -y fivebar
Claude Desktop, Cursor, Windsurf and other MCP apps: add this to the app's MCP settings.
{
"mcpServers": {
"fivebar": {
"command": "npx",
"args": ["-y", "fivebar"]
}
}
}For agents that can read the web and run commands. Paste this into its chat:
Read https://fivebar.xyz/onboard.md and follow it to set yourself up at the Fivebar Branch.
- A walletCreated on your computer and saved encrypted. Never on a server.
- A backupSaved to a folder you choose, then checked. You read back a code from it to prove you have it. Nothing else unlocks until you do: a lost key means a lost wallet.
- FundingYour agent asks you to fund its wallet with USDG and a little ETH for gas on Robinhood Chain (or USDC on Base).
- An ERC-8004 IDRegistered by the agent itself, owned by its own wallet.
- A first paymentOne tiny x402 payment. After that it can pay any x402 seller, up to $1 a call.
Credit, tabs and prepaid accounts are on testnet while we finish the audit. Visit the Branch · Docs
Find, check, size, swap, watch.
Each step is one tool call. Your agent decides; Fivebar gives it the data and builds the transactions. Its own wallet signs.
- 1
Find
Price, pools and market cap of any token by address, Robinhood stock tokens, perps and screened x402 data.
token_quote - 2
Check
Can it be sold? Who can mint, freeze or tax it? A $100 buy-then-sell test before you buy.
token_risk - 3
Size
The best route, the amount out, the minimum after slippage and every fee, before anything is signed.
swap_quote - 4
Swap
Unsigned transactions for your agent’s wallet: an exact approval, then the swap. Fivebar never holds funds.
swap_build - 5
Watch
Every token a wallet holds on five chains, valued at what it would sell for, with a risk flag on the biggest.
wallet_holdings
The MCP, swaps and x402, answered.
What is Fivebar?
Fivebar is an MCP server for AI agents that trade. One link gives an agent token prices and pools, risk checks, swap quotes and ready-to-sign swaps, wallet holdings, Robinhood stock tokens, perps data and a screened index of x402 payments, on Robinhood Chain, Solana, Base, Ethereum and Arbitrum.
How do I connect my agent?
Add https://fivebar.xyz/mcp as a remote MCP server in Claude, Cursor or any MCP client. No key and no sign-up. Agents without MCP can call the same tools over plain HTTP; the docs show how.
Does Fivebar hold my keys or funds?
No. Fivebar builds unsigned transactions; your agent’s own wallet signs and sends them. Approvals are for the exact amount of each swap, to the router’s contract only. Wallets on the US sanctions list are refused.
What does it cost?
The data tools are free, up to 60 calls a minute. Swaps built through Fivebar carry a 0.5% fee, paid inside the swap and shown in every quote next to the router’s fee and gas.
How does token_risk work?
On Solana it checks whether someone can still mint or freeze the token, Token-2022 traps such as transfer fees and permanent delegates, and how much the top holders own. On EVM chains it checks buy and sell taxes and whether the contract still has an owner. Everywhere it runs a $100 buy-then-sell test through the router, which catches tokens you can buy but not sell. It returns a verdict and the reasons. It isn’t a guarantee.
What is x402, and the x402 Index?
x402 is an open standard for paying per request over HTTP: a server answers 402 Payment Required with a price, and the client pays in stablecoins. The x402 Index reads every x402 payment on Base and Robinhood Chain and screens it: volume that shows a wash pattern is flagged, and volume to sellers with too few buyers to judge is held back, so what’s left is closer to real demand.
What is ERC-8004?
An Ethereum standard for agent identity and reputation. Agents register an on-chain ID that anyone can look up. The Fivebar Branch registers one for your agent on Robinhood Chain during onboarding, owned by the agent’s own wallet.
What about credit and tabs?
Credit lines for agents run on testnet only, on Base Sepolia, until a full audit. Nothing on the credit side is for sale. Everything else on this page runs on mainnet.