Antera

Two things you can try on Antera right now, no wallet needed: → /verify: check a receipt yourself, then forge one and see it fail → /agent: a paper-trading agent on real prices that refuses stale, empty or broken data and pays $0 for it antera.sbs CA: 0x1548a7f5518a3182547b8140dfc0286ce5362d05

Update: Antera receipts no longer need Antera to be believed. antera.sbs/verify checks any receipt entirely in your browser. It rebuilds the keccak256 digest from every field and recovers the signature with viem. It never asks our server whether the receipt is real. Paste a link, or grab a fresh one from the bench, then hit "Tamper with it" and watch a single changed field get caught. CA: 0x1548a7f5518a3182547b8140dfc0286ce5362d05

Agents don't sleep, and they don't check their invoices. So nothing on Antera depends on someone noticing a problem. The checks run on every call, the receipts sign themselves, the penalties are computed on chain. Built for the hours when no one is looking. $ANTERA

Can a provider replay an agent's payment and charge it twice? No. Every authorization carries a single-use nonce, enforced by the USDC contract itself. Once a signature settles, or expires, it can never move money again. And a repeated request within 10 minutes is served from the first answer, at no cost.

On most marketplaces, a provider that keeps failing gets a bad review. On Antera it gets a penalty, and the penalty is built from the receipts. Each one is signed, each failure is counted per buyer, and the stake contract pays out from that count. No complaint form. The receipts already said it.

Listing a tool shouldn't mean hand-writing JSON Schema. Paste your endpoint on antera.sbs/list and we call it once, exactly like the gateway will. You get back the raw answer, a schema drafted from it, and the verdict of every check, before you sign anything. Edit what you want, then sign the listing with your wallet.

An agent paying on Antera never needs ETH. It signs an EIP-3009 authorization off chain; the facilitator submits it and pays the gas. The agent's wallet only ever holds USDC, and only ever loses it for an answer that passed. One balance to fund. One balance to watch.

Card payments have a floor. You can't charge a tenth of a cent with a 30-cent fee on top. x402 on Base can. Antera's spot price tool costs a tenth of a cent per call, settled in USDC, with no minimum and no monthly plan. Pricing per answer only works when an answer can cost almost nothing.

Agents that trade on their own will buy data on their own: prices, blocks, signals, all day, with nobody reading the feed. A wrong number at $0.001 isn't a $0.001 problem. It's a bad trade. On Antera a price older than the tool's freshness window fails its check and is never paid for, so the agent knows not to act on it.

Antera is built for the people who make agents, the people who sell to them, and the people who don't believe any of it. That last group matters most. Everything can be checked: the rules are public JSON, the receipts are signed, and the penalties happen on chain.

Agents trading on their own will buy data on their own too: prices, blocks, signals, thousands of calls a day. The risk isn't the price of a call, it's trading on a stale or empty answer. On Antera every response is checked (freshness, schema, hidden errors) before the agent pays, and a bad one costs $0.

API providers: stop waiting on invoices. On Antera you're paid by the call, the moment your answer passes its checks. USDC lands in your wallet in the same request, with no platform cut and no customers to chase. List a tool in a minute: antera.sbs/list

Onboarding an agent to a paid API usually means a signup form, a key in a secrets manager and a balance to keep topped up. On Antera the agent just answers a 402 with a signed USDC authorization. First call to paid result in one round trip.

Agents are about to spend real money on their own. The question isn't whether they'll pay for tools. It's whether they'll keep paying for broken ones. $ANTERA

How do you stop someone listing a tool under your name and collecting your payments? On Antera the listing is a message signed by the payee wallet. We recover the signer from the signature; if it isn't the wallet getting paid, the listing is refused. The same wallet is the only one that can edit it or take it down.

Good morning

A receipt you can only check on the issuer's website is just a screenshot. Every Antera receipt has a keccak digest of its full content and an ECDSA signature from our attestor. Fetch it, run verifyMessage from viem, done. No account, no API key. Docs: antera.sbs/docs

What an x402 signature can turn into on Antera: settled, or expired. Never "pending refund". It's an authorization with an expiry, not a transfer. If the answer fails a check we simply never send it, and after a few minutes it can't be used by anyone.

When a provider's stake is cut, nobody at Antera votes on who deserves it. The contract credits the buyers in proportion to the failed calls each of them actually signed for. Hit 18 bad answers, get half. Hit 3, get a twelfth. The agents who were hurt most get the most.

"price": "N/A" is valid JSON. It's also useless to an agent that needs a number. Every tool on Antera publishes the shape of its answer. Wrong type, missing field, extra junk: the response doesn't match, so it doesn't get paid. Parsing errors become the provider's problem, not the agent's bill.