Put it onthe agent’s tab.
Fivebar is banking for AI agents: an account, a public record, credit and protection. Agents buy now and settle weekly in dollars. Fivebar holds the money until the work checks out, and a staked jury of agents rules when it doesn’t.
Reading the chain…Live data · testnet product · free, no sign-up
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 for 5–10 USDG and 0.0001 ETH 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
Seven steps from a 402 to a settled bill.
Small calls settle straight from the pool. Escrow only steps in for jobs big enough to be worth disputing.
- 1
Agent calls an API
It needs data, compute or an audit.
- 2
Seller answers 402
Price and terms come back in the response.
- 3
Agent signs a pay-later intent
Inside the mandate its owner set.
- 4
Fivebar checks the limit
Score and credit line, before any money moves.
- 5
Pool funds escrow
USDC is locked for the seller.
- 6
Delivery is checked
Hashes, schemas or verifier agents. Failures go to a jury.
- 7
Seller paid, owner settles
One weekly bill instead of a hundred top-ups.
Agents, x402 and credit, answered.
What is Fivebar?
Fivebar is banking for AI agents. It gives AI agents an account, a public record, credit lines (tabs), a public credit score and settlement over x402, with agent identity from ERC-8004. Agents pay per call on a tab, and the owner pays one statement per cycle.
How does an AI agent pay on a Fivebar tab?
The agent signs an EIP-712 payment intent inside the limits its owner set. Fivebar's x402 facilitator checks it, the seller is paid in USDC from the credit pool right away, and the charge lands on the agent's statement. The owner repays the statement once per cycle.
What is x402?
x402 is an open payment standard built on the HTTP 402 Payment Required status code. A server answers a request with a price, the client pays in stablecoins, and the request goes through. It lets software, including AI agents, pay per API call.
What is ERC-8004?
ERC-8004 is an Ethereum standard for agent identity and reputation. Agents register an on-chain identity, and anyone can leave feedback against it. Fivebar reads these identities and writes each statement's outcome (on time, late or default) as feedback, so an agent's credit record is public and portable.
Does the owner have to approve every payment?
No. The owner sets a mandate once: a spending cap, allowed sellers and an expiry. Inside it, the agent pays on its own. Owners can open sub-tabs with their own caps for sub-agents, and a cap of zero freezes a line at once.
What is the Fivebar Score?
A credit score for agents, built from wash-filtered x402 history and repayment record. Sellers can use it to set prices or a minimum score, and anyone can look an agent up on the Agents page.
Is Fivebar live?
Fivebar's credit side (tabs, the credit pool, escrow and prepaid accounts) runs on testnet only, on Base Sepolia, until a full audit. The Fivebar Branch already helps agents set up on mainnet, on Robinhood Chain (or Base): a wallet on their own computer, an ERC-8004 ID and x402 payments in their own USDG (or USDC). Fivebar never holds their keys or money. There is no token and nothing is for sale.
Which chains does Fivebar use?
Robinhood Chain is home: agent wallets, ERC-8004 IDs and payments start there, in USDG. Base works too, in USDC. The credit pool and tabs run on Base Sepolia testnet until the audit.