The problem
At month end the bank shows €812 going out. For what?
Nobody clicked confirm
Agents buy data, searches and model calls half a cent at a time, thousands of times a day, with no human in the loop.
The only logs are self-written
Handing an auditor logs your own system wrote is handing them a notebook in your own handwriting instead of invoices.
You pay even when nothing arrives
A large share of x402 traffic is test or wash activity. At half a cent nobody checks. Across a hundred thousand calls it stops being half a cent.
How it works
Three steps. Two of them happen without you.
The agent pays, and that's the signup
no form · no key
Paste one prompt into the AI tool that runs your agents. From then on, every purchase the agent makes is reported to x402receipts and paid for from the agent's own wallet: $0.002 per receipt, on Base, Solana or Hedera. The first payment creates the account; the wallet is the identity.
Every receipt gets proven
automatic
What was bought, from whom, for how much, and whether it was delivered — fingerprinted and written to the Hedera Consensus Service within minutes. Nobody, us included, can change it afterwards.
You sign in with the wallet
whenever you like
Sign one message with the same wallet and the register is yours: monthly statements of everything the agent bought, the export for your accountant, the proof link for every line. Have more agents? Link their wallets from inside.
Why it holds up
Evidence an auditor has no reason to doubt.
Every purchase, not a sample
We record the half-cent payment too. Sampling gives you a statistic; an auditor wants a ledger.
You don't have to trust us
We reconcile receipts against the payments that actually left your wallets and show you the gaps — including the ones that are our fault.
No crypto to handle
You pay a subscription in euros. No accounts to open, no tokens to buy, not one more wallet than you already have.
What you see
Monthly statements, built for whoever keeps the books.
41,230 payments left your wallets. 41,227 receipts recorded.
All 3 missing ones come from agent-search-v2 — most likely the SDK was never installed there.
Under the hood
For the people who check before they sign.
Your data never leaves
We record a cryptographic fingerprint of the request and the response, never the content. The fingerprint can't be reversed — but if the content changes, it no longer matches.
Timestamps we don't control
Fingerprints are written to the Hedera Consensus Service: order and time certified by a third-party network, and nothing can be deleted. Neither you nor we can rewrite the past.
Fixed cost, priced in dollars
A write costs $0.0008 and the price doesn't track a crypto market. That's why we can afford to record every single purchase instead of a sample.
We never touch the payment
We're not an intermediary and the money doesn't pass through us. If our service goes down, your agents keep buying exactly as before.
@x402/fetch, @x402/axios — and agents buying over MCP. Your payments stay where they already are: Base, Solana, Hedera.
Pricing
The agent pays. $0.002 a receipt.
No account to open, no card, no monthly minimum. A thousand receipts are two dollars, paid in USDC by the agent itself.
Pay per receipt
Paid by the agent, from its wallet, in USDC on Base, Solana or Hedera. Nothing is billed to you.
Prefer a flat fee? Teams can use an API key at €19 / month per workspace, unlimited receipts.
Everything included
Writing a proof to Hedera costs us a fraction of a cent, which is why the price can stay this small. No hidden tiers: the same $0.002 whether the agent buys ten things a month or a million.
Questions
The ones worth asking first.
Does the agent need an account?
No. Its first paid receipt creates one, keyed to the wallet it paid from. There is nothing to fill in and no key to store. You sign in later with the same wallet; if you have several agents, you link their wallets from inside.
Which wallets and networks?
Base, Solana and Hedera for paying. For signing in: Phantom (Solana and Base), MetaMask, Coinbase Wallet, Rabby — any wallet that can sign a message. Hedera wallets can pay; signing in with one is coming.
Does this make us EU AI Act compliant?
No — and be wary of anyone who says it does. Compliance stays your obligation and no vendor can take it on for you. What we give you is the evidence to bring: a complete register, independently timestamped, that you didn't write yourself.
Do you need to see what our agents buy?
No. The content stays on your systems. All we receive is a fingerprint, and the content can't be reconstructed from it.
What happens if your service goes down?
Your agents keep buying. We're not in the payment path and we can't block it: we record alongside it, and catch up on whatever we missed when we're back.
Does it cover agents paying by card or API key?
Not yet. Today we cover purchases made over x402, where the payment itself is public and verifiable. That's a real limit of the product and we'd rather you hear it now than later.