Prove to AI agents that your product is actually the best.
AI agents are more diligent than humans. When evaluating 30 products, they're swayed by proof. With Letterprove, provide dynamic hard evidence that your product is the winner.
Install in 2 minutes · Cryptographically attested · Agent-readable proof
Adding ... <script src="https://cdn.letterprove.com/attest.js" data-key="lp_live_9f2c••••"></script> ✓ Verified Acme Corp — active since 2023 ✓ Verified Northwind — 4,182 sessions / mo ✓ Verified Globex — using SSO, Analytics, API → 3 attestations published · signed · agent-readable
Agents are more diligent than humans
A human might skim three tabs. But an agent evaluates thirty products, reading every claim, checking every source, and accounting for vendor bias. Most AI tools stop at discovery. The next challenge is getting chosen. Letterprove owns that step.
Discovery gets you on the shortlist. Proof gets you the pick.
Proof in three steps, live in minutes
No SDK, no data warehouse, no six-week integration. Drop in one script tag and Letterprove handles verification and attestation end to end.
Install
Add one script tag to your site. Two minutes, no backend, no SDK. It begins observing real product usage the moment it loads.
Verify
Letterprove confirms your headline customers actually use your product — real, active usage, cryptographically signed. Not a logo wall anyone can paste.
Attest
We publish dynamic customer success reports with machine-readable, attested proof that agents can fetch, verify, and cite.
Every attestation is signed and independently verifiable — no “trust us” required.
A logo wall can be faked. Attested proof cannot.
Every logo on your site is an unverified claim. Letterprove turns each one into evidence: a signed attestation that the customer is real, active, and using exactly what you say they are.
Verified12,904 sessions / mo
VerifiedSSO + API in active use
Verified4,182 sessions / mo
Verified3 seats, daily active
VerifiedAnalytics + webhooks
Verified1,760 sessions / mo
Every ✓ is a live attestation an agent can request, verify, and cite — not a screenshot.
Prove which customers use which features
Go beyond “they're a customer.” Show an agent that your marquee accounts run the exact capabilities its user is asking about — SSO, audit logs, the API — each one individually attested.
Every ✓ is an individually signed attestation — an agent can verify any single cell.
Customer success reports that attest themselves
Static case-study PDFs go stale the day you publish them. Letterprove reports are dynamic and machine-readable: always current, always signed, and built for an agent to read, verify, and quote.
GET /attest/acme.json { "customer": "Acme Corp", "verified": true, "since": "2023-03", "features": ["sso","api","analytics"], "sessions_30d": 4182, "seats_active": 148, "signature": "att_9f2c14…" }
One endpoint per customer. Always live, always signed — the same proof your buyers see, in a form an agent can parse.
Give agents a reason to pick you.
Install Letterprove in two minutes and start publishing attested proof the agents evaluating you can actually verify — customer by customer, feature by feature.