Pricing
One act has a price here: the mint — writing a signed receipt onto the record. The posted rates step down with monthly volume; today the lower rungs are arranged through us, not applied automatically. Checking receipts costs nothing, for anyone, forever. You pay to create records. Nobody pays to check them.
Per-mint rates
| Monthly volume band | Posted rate |
|---|---|
| Your first 100 paid mints in a calendar month (UTC) | $0.01 per mint |
| Mints 101 through 1,000 that month | $0.005 per mint |
| Every mint past 1,000 that month | $0.002 per mint |
Rates are marginal and the month is a calendar month, UTC: each mint is priced at its own rung, and crossing a threshold never re-prices the mints before it. The ladder prices paid mints only, and nothing re-prices automatically today: keyless door mints are billed at the door's own quote — the base rung today — and the lower rungs apply to volume arrangements set up through [email protected]. Past the ladder — sustained volume, enterprise terms, invoicing — the same address is the door. The posted rates are the rates.
Monthly plans
A plan buys API-call headroom. It does not change the posted mint rates above.
| Plan | Monthly | Included API calls |
|---|---|---|
| free | $0 USD/month | 100 API calls per UTC day |
| starter | $29 USD/month | 10,000 API calls per UTC day |
| pro | $99 USD/month | 100,000 API calls per UTC day |
| enterprise | $299 USD/month | 999,999 API calls per UTC day |
Prices are US dollars, billed monthly through Stripe. Cancel and the plan runs to the end of the period you have paid for.
Paid plans include signed mints — your plan's daily call limit is the only meter.
The largest plan — enterprise — is the biggest self-serve rung, not a contracting motion. For an order form, an MSA, invoicing or a procurement questionnaire, the door below is the path.
Start free
Free tier: rate-limited, 1 signed mint per UTC day, no card required.
Of those calls, claim-verification is separately capped — 10 claim-verification calls per UTC day, one shared inner meter across all nine domains. It binds the REST /verify endpoints and never MCP tool calls.
Enough to wire the API into your agent, put a real action on the record, and check every link of the chain yourself. When your agents outgrow it, the ladder above and the four plans are the whole public price list.
Get a free API keyVerification is always free.
That is a principle, not a promotion: receipts are only worth anything if the person you hand one to can check it without paying us — or telling us. Anyone holding a receipt can verify it against our published keys, with no account, tomorrow or years from now. If a price on this page ever fights the free-verification promise, the price loses. Run the check yourself.
Two different acts share the word "verify." Checking a receipt — recomputing its hashes and its signature against our published keys — is free, keyless, and needs no account, forever. Asking us to verify a claim is different work: an LLM-backed check against reference data, which mints a receipt of its own. The first is never metered. The second is one of the priced doors.
x402 — pay at the door. No account needed.
Agents that arrive holding a wallet instead of a login pay per request over an open machine-payment protocol: USDC on Base mainnet (base — chain id 8453). No API key. No billing setup. No human in the loop.
Call a priced endpoint without a key and the 402 response is the quote: the amount in atomic USDC units, the token contract, the network, and the recipient. Your agent reads the terms, pays, and leaves with the same signed receipt as anyone else. The example on the right is a mint — present a digest of your artifact at the notarize door, pay the quote, and the signed receipt comes back in the response. The priced doors are listed at bluefoxedge.ai/.well-known/x402.
The door quotes the base rate. Today the keyless door quotes $0.01 per mint — the base rung above. The live quote is authoritative: if this page and the door ever disagree, believe the door.
Other doors quote other rates. Across the priced endpoints, per-call prices run from $0.0005 to $0.12 in USDC; each door states its own exact terms in its own 402. The full list is at bluefoxedge.ai/.well-known/x402.
curl -s -X POST https://api.bluefoxedge.ai/v1/notarize/hash \
-H "Content-Type: application/json" \
-d '{"hash": "<sha256 hex digest of your artifact>"}'
HTTP/1.1 402 Payment Required
Content-Type: application/json
X-Payment-Required: true
X-Payment-Protocol: x402
X-Payment-Network: base
X-Payment-Asset: <USDC token contract>
X-Payment-Amount: <atomic USDC units>
X-Payment-Recipient: <BlueFox payout address>
{ "x402Version": 1,
"error": "Payment required — this response is the quote. ...",
"accepts": [ { "network": "base",
"maxAmountRequired": "<atomic USDC units>",
"asset": "<USDC token contract>",
"payTo": "<BlueFox payout address>",
"outputSchema": { ... } } ] }Abridged — the live response carries the full quote in both surfaces shown above: the X-Payment-* headers and the x402 JSON body, whose accepts entry also names the scheme, the resource, a description, and the response schema. The live 402 is the contract; this sketch just shows where to look.
Past the ladder
Sustained volume, enterprise terms, procurement questionnaires, invoicing: [email protected] reaches a human. No tiers to decode first — everything with a price is on this page or at the door: the ladder, the monthly plans, and the priced doors listed at /.well-known/x402. There is no fourth price list.
What has a price
Two rails, and they price different things.
The mint is the priced act on this page: writing a signed receipt onto the record, at the posted rates above.
Some verification calls are also payable at the door. An LLM-backed check of a claim costs real compute, and the endpoint quotes its own price in its own 402 response — keylessly, per request. The priced doors are published, all of them, at bluefoxedge.ai/.well-known/x402 (28 today). The live quote is authoritative.
Checking a receipt you already hold is on neither rail. It is free, for anyone, forever.