Free
€0
10,000 entries per month
- The complete cryptographic pipeline — nothing is held back
- Writes stop when you reach 10,000; nothing is billed
- Agents can provision their own free-tier account over the API, no browser required
Pricing
Priced per log entry, capped by design
Every plan includes the full cryptographic pipeline — signed receipts, Merkle batching, Bitcoin anchoring, and offline verification. The plan only changes how many entries you write each month.
Plans
Choose an included volume
Most common
Pro
€49/ month
100,000 entries per month
- Everything in Free
- Optional metered overage at €0.0005 per entry
- Hard cap at 500,000 entries — a stop, not a surcharge
Business
€249/ month
1,000,000 entries per month
- Everything in Pro
- Optional metered overage at €0.0005 per entry
- Hard cap at 5,000,000 entries
Enterprise
Let's talk
Unlimited included volume
- Everything in Business
- Volume and terms agreed with you, not read off a page
- Custom included volume set per account
Prices are in EUR. The amount shown is the amount charged — no VAT or other tax is added at checkout.
Billing runs on calendar months. Your first charge is prorated from signup to the 1st of the next month; the full monthly price starts then.
Beyond the included volume
Overage is off until you turn it on
An audit log that silently bills you for a runaway agent is not a feature. Overage is opt-in per account and capped in every case.
| Plan | Included | Overage | Hard cap |
|---|---|---|---|
| Free | 10,000 | Not available | 10,000 |
| Pro | 100,000 | €0.0005 / entry | 500,000 (5×) |
| Business | 1,000,000 | €0.0005 / entry | 5,000,000 (5×) |
| Enterprise | Unlimited | Agreed with you | Agreed with you |
Overage is disabled by default on every plan. You enable it yourself from your dashboard; until you do, writes stop at your included volume rather than continuing at a cost. Overage is metered by TrustNotch and billed in arrears at the end of the month, and the hard cap is a genuine stop — writes are refused past it, they are not billed at a higher rate. We email you at 80% and 100% of your included volume, and again as you approach the cap.
In every plan
The proof pipeline is not a paid tier
A cheaper plan does not get weaker evidence. Free and Enterprise entries are cryptographically identical.
- Ed25519-signed receipt for every entry Returned on write, over the RFC 6962 leaf hash.
- RFC 6962 Merkle tree batching The same append-only structure used by Certificate Transparency.
- Batch roots anchored to Bitcoin Via OpenTimestamps, which aggregates many roots into a single on-chain commitment — there is no Bitcoin transaction per entry, and none is needed.
- Independent open-source verifier Anyone can check your logs with the published
trustnotchpackage, offline, with no TrustNotch server involved. - MCP server Agents log and verify through the Model Context Protocol.
- Built and hosted in the EU Aimed at EU AI Act Article 12 record-keeping for high-risk AI systems.
Before you sign up
Two things worth knowing
Changing plans. You can move between plans or cancel at any time from your dashboard. Cancelling takes effect at the end of the billing period you have already paid for, so your logging is never cut off mid-month.
What an entry is. One entry is one logged action. You send the action and its metadata; TrustNotch returns a signed receipt and includes the entry in the next batch.
Get started
Start on the free tier
10,000 entries a month, the full proof pipeline, no card required. Move up when your volume does.