Every transaction
in your app,
legally verifiable.
One API call generates a cryptographic certificate for any event in your app — agreements, payments, deliveries, app installs. No lawyers. No complexity. Just proof.
// Request
await taas.certify({
type: "payment_confirmed",
payload: { amount: 499.00, currency: "USD" },
meta: { app_id: "com.acme.marketplace" }
});
// Certificate returned
{
cert_id: "cert_5f3a8c2d-...",
hash: "a3f4b2c1e9...", // SHA-256
timestamp: "2026-06-01T14:30:01Z", // RFC 3161
signature: "RSA-PSS-SHA256",
valid: true
}100 free certifications/day on sandbox. No credit card required.
Trusted by teams building on trust
The problem
Your app handles money and agreements.
What happens when someone denies it?
One unproven dispute can cost more than a year of TaaS. Most teams realize this only after the first incident.
Disputes without evidence
A buyer claims they never confirmed the delivery. A seller says payment was authorized. Without cryptographic proof, you rely on screenshots and he-said-she-said — costing $10k+ per legal dispute.
No API built for in-app events
DocuSign is for documents. AWS handles files. Neither was designed to certify what happens *inside* a mobile app — a tap, a payment confirmation, an app install. You end up building it yourself.
Enterprise pricing kills small teams
DocuSign starts at $25/user/month. Building trust infrastructure in-house costs $5k–$20k in dev time before the first certificate. Startups just starting out can't justify either.
The math is simple.
1 legal dispute averages $10,000+ in the US. TaaS starts at $49/month.
The only API that certifies what happens inside your app
Most trust services certify documents. TaaS certifies actions — including what happens inside your mobile app before, during, and after any critical moment.
POST /v1/certify
{
"type": "app_install",
"payload": {
"app_id": "com.acme.enterprise",
"version": "2.1.4",
"platform": "android",
"distribution": "direct_apk",
"device_id": "uuid-device-f3a9"
}
}How it works
From event to certificate in <200ms
No infrastructure to manage. No PKI to configure. Just an API key and four steps.
Send the event
POST any payload to /v1/certify — a payment, an install, an agreement. No schema required.
fetch('https://api.taas.io/v1/certify', {
method: 'POST',
headers: { 'X-API-Key': key },
body: JSON.stringify({ type, payload })
})We hash & timestamp it
TaaS generates a SHA-256 hash of your payload and anchors it with an RFC 3161 timestamp.
hash = SHA256(canonical_payload)
timestamp = RFC3161.stamp(hash)
// Tamper-proof — not even TaaS can backdateCertificate returned
You receive a signed certificate (JSON + PDF) in milliseconds. Store it or let TaaS handle storage.
{
"cert_id": "cert_5f3a...",
"hash": "a3f4b2c1...",
"timestamp": "2026-06-01T14:30:01Z",
"signature": "RSA-PSS-SHA256",
"valid": true
}Verify anytime, anywhere
Anyone — judges, auditors, your users — can verify a certificate via our public API, forever.
GET /v1/verify/{cert_id}
// 200 OK → { valid: true, issued_at: "..." }
// Works without TaaS credentialsUse cases
Built for teams that can't afford doubt
Any event that matters to your business can be certified. Here's where teams start.
Marketplaces & Escrow
Certify buyer confirmations, seller acceptances, and fund releases. Non-repudiable proof when a party later claims "I never agreed."
event: escrow_releaseLogistics & Delivery
Proof of delivery with GPS coordinates, recipient signature, and timestamp. Eliminates fraudulent "I never received it" claims.
event: delivery_completeApp Install Certification
Certify installs of enterprise APKs, TestFlight builds, and PWAs outside official stores. Prove which version, which device, when.
event: app_installFintech & Payments
Transaction authorization proof at the moment of user intent. Combat chargebacks with irrefutable cryptographic evidence.
event: payment_authorizedFreelance Platforms
Certify project approvals, milestone acceptances, and contract signatures. Remove ambiguity from remote work agreements.
event: work_acceptedLegal & Compliance
CCPA-compliant ToS acceptance certificates. Audit trails for KYC steps. Evidence that holds in US courts and arbitration.
event: tos_acceptanceWhy TaaS
Better than the alternatives
DocuSign isn't built for app events. Building in-house costs a quarter of engineering time. TaaS closes the gap.
Pricing
Simple, usage-based pricing
Start with a free sandbox — 100 certs/day, no card required. Pay only when you scale.
Development sandbox: 100 free certifications/day. No credit card.
Starter
10,000 certs/month
For apps just starting to add trust.
- POST /v1/certify
- GET /v1/verify (public)
- JSON + PDF certificates
- Dashboard access
- Email support
Pro
100,000 certs/month
For growing apps with real transaction volume.
- Everything in Starter
- Webhook notifications
- CSV + API export
- Custom certificate branding
- Priority support
Enterprise
Unlimited
SLA, dedicated support, and custom integrations.
- Everything in Pro
- 99.9% SLA
- Dedicated account manager
- Blockchain anchoring (opt-in)
- Custom integrations
All plans include: SHA-256, RFC 3161, RSA-PSS signing, public verification API, 99% uptime.
Add legal-grade trust to your app
in under an hour.
Start with 100 free certifications/day on sandbox. No credit card. Upgrade when your users depend on it.
B2B API · RFC 3161 · SHA-256 · RSA-PSS · CCPA compliant · Cews Investments Corp, USA