NEXTKIN
NEXTKINDigital Legacy
Introducing NEXTKIN · API-first digital inheritance

Digital Wills for the
API Era

The infrastructure platform for digital inheritance. Add wills, beneficiaries, inactivity monitoring, and automated transfers to any app with a simple API.

Start building for free5-minute quickstartRead the docs →
40+
REST endpoints
12
Webhook events
HMAC-SHA256
Verified webhook signing
Edge
Runs on

BUILT FOR TEAMS SHIPPING DIGITAL LEGACY

Crypto custodiansCloud storagePassword managersFintech & neobanksLegal techEstate planning

Everything you need

A complete API platform to manage wills, beneficiaries, and automated transfers.

Signed Webhooks

HMAC-SHA256 signed events for inactivity, claims, verifications, and transfers, with automatic retries and dispatch monitoring.

Death Verification

Private storage for death certificates, admin review queue, evidence pack generation, and signed audit trails.

Inactivity Monitoring

Configurable ping windows, warning emails, and automated ownership transfer cron jobs running at the edge.

Beneficiaries & Roles

Next of kin, trusted contacts, admins, owners, all with RLS-enforced roles via a separate user_roles table.

Audit Logs

Every action, every actor, every IP, immutable, searchable audit logs across apps, users, and admin operations.

Evidence Pack

Single-click bundle of certificates, identity checks, timestamps, and webhook receipts, ready for legal handoff.

Early Claims & Emergency Access

Beneficiary-initiated claims with owner reject windows, admin verification, contestation, and emergency-access webhooks.

Rate Limits & PII Guard

Per-app rate limiting plus a PII guard that rejects raw SSN/EIN at the edge, last-four or tokenized refs only.

HIPAA BAA & Encryption

Field-level PII encryption, private buckets, signed URLs, HIPAA BAA tracking, and SOC 2-ready controls.

Integrate this morning

Simple, elegant API that fits right into your code. SDKs for your favorite languages.

api.nextkin.dev
curl -X POST https://api.nextkin.dev/v1/users/usr_123/early-claim \
  -H "Authorization: Bearer {api_key}" \
  -H "X-App-Id: {app_id}" \
  -d '{
    "claimant_email": "beneficiary@example.com",
    "death_certificate_url": "https://..."
  }'
Claim Workflow

Secure ownership transfer

Beneficiary submits an early claim → Owner receives a 24h reject window → Admin reviews identity → Ownership is securely transferred.

  • 24h owner reject window
  • Signed HMAC webhooks
  • Audit log on every action
  1. 1

    Claim Submitted

    Beneficiary files early claim with evidence

  2. 2

    Owner Notification

    Email sent with 24h reject link

  3. 3

    Identity Verification

    Admin reviews death certificate

  4. 4

    Ownership Transferred

    Webhook sent, beneficiary gains access

Real-time webhook delivery

Every state change triggers a signed webhook. Reliable delivery with automatic retries.

POST https://your-app.com/webhooks/nextkinSigned (HMAC-SHA256)
{
  "event": "early_claim.submitted",
  "timestamp": "2026-06-03T10:00:00Z",
  "data": {
    "claim_id": "clm_abc123",
    "user_id": "usr_123",
    "claimant_email": "beneficiary@example.com",
    "status": "pending_owner_action"
  }
}
Enterprise Grade

Built for trust and compliance

NEXTKIN is built for legal, financial, and high-trust workloads.

  • Field-level PII encryption at rest
  • Immutable audit logs for every action
  • HIPAA BAA available for covered entities
  • GDPR-ready data export & deletion
  • PII guard blocks raw SSN / EIN at the edge
  • HMAC-SHA256 signed webhook delivery
api.nextkin.dev
curl -X POST https://api.nextkin.dev/v1/users/usr_123/early-claim \
  -H "Authorization: Bearer {api_key}" \
  -H "X-App-Id: {app_id}" \
  -d '{
    "claimant_email": "beneficiary@example.com",
    "death_certificate_url": "https://..."
  }'

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