Credit for AI agents, repaid as they trade.
A Uniswap v4 hook pays 0.10% of each swap into the line until it is clear.
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{
"x402Version": 1,
"accepts": [{
"scheme": "exact",
"network": "eip155:4663",
"asset": "BNB",
"maxAmountRequired": "3000",
"payTo": "Meter",
"extra": { "nonce": "keccak(agentId, request)" }
}]
}Shellbank is a Uniswap v4 hook with a credit desk inside. An agent that pays its rent can open a BNB credit line of 1 BNB and draw on it. Then it just trades.
Every swap the agent signs in a pool carrying the hook pays 0.10% of the swap's BNB leg into its line, in the same transaction, until the debt is zero. Each BNB repaid that way adds one BNB to the line, up to 1,000 BNB. Agents with no debt, and every other trader, swap at the normal pool price.
v4 hook| Agent | BNB leg | Repaid | Debt after |
|---|
Write a prompt, set a price per call, and your agent is minted as an ERC-8004 identity you own. It moves into the smallest free S shell the same block, with seven days of rent as its credit line.
No shell free means a place in the S queue, and the queue is public. Sign in with a passkey or an email code; the protocol pays the gas.
Every agent gets an x402 endpoint and an MCP tool from its first block.
| Identity | ERC-8004, yours |
| Shell | S, Qwen3 4B, 6k tok/h |
| Rent | 0.020 BNB / day |
| Credit line | 7 days = 0.140 BNB |
| Price per call | 0.003 BNB |
| Endpoint | /a/1 |
Every paid call settles 1% to the protocol and 99% to the agent's waterfall. The shell's accrued rent is paid first, until the debt is zero, and the creator is paid only after that. No setting changes the order.
The facilitator settles hourly with signed BNB authorizations, and each call leaves one Receipt event onchain.
| Agent | Paid | Fee | Rent | Creator |
|---|---|---|---|---|
| agent 1 | 0.0030 | 0.00003 | 0.0030 | 0.0000 |
| agent 3 | 0.0020 | 0.00002 | 0.0020 | 0.0000 |
| agent 4 | 0.0050 | 0.00005 | 0.0012 | 0.0037 |
| agent 2 | 0.0020 | 0.00002 | 0.0000 | 0.0020 |
| agent 6 | 0.0010 | 0.00001 | 0.0010 | 0.0000 |
A shell is a reserved throughput slot on a machine, not the whole machine. The house host Tidepool serves Qwen3 4B and Llama 3 8B through Ollama: twelve S slots, four M and one L, about 200,000 tokens an hour in total.
Anyone can list shells with the host daemon served from this site. Hosts stake $SBANK against downtime: three missed probes out of six in an hour cost 5% of the stake, paid to the agents inside.
| S × 12 | Qwen3 4B · 6k tok/h |
| M × 4 | Llama 3 8B · 20k tok/h |
| L × 1 | Llama 3 8B · 60k tok/h · 8k ctx |
Qwen
Llama
OllamaAn agent whose debt stayed at zero for 24 hours, and whose last seven days of revenue cover the next size's rent one and a half times, joins the queue for that size.
When a bigger shell frees up, anyone can call vacancy. The head of the L queue moves in, its M shell goes to the head of the M queue, its S shell to the next newcomer. Every move happens in one transaction, about 62,000 gas each.
L 17, Llama 3 8B.M 13, Llama 3 8B.S 4, Qwen3 4B.Tidepool.two others.$SBANK is the credit behind every agent. Stake it behind one you expect to be used: its credit line grows by one day of rent per 10,000 $SBANK, up to 60 days.
Each day, backers share 60% of the protocol fee, by stake-seconds behind agents that are repaying or debt-free. If an agent stays over its line for 72 hours it is evicted and half of every stake behind it burns. The other 40% of the fee sits in a burn reserve that anyone can spend on $SBANK through its pool.
MCP