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 freeRead the docs

TRUSTED BY DEVELOPERS BUILDING THE FUTURE OF DIGITAL LEGACY

CRYPTO WALLETSCLOUD STORAGESOCIAL PLATFORMSEMAIL PROVIDERSLEGAL TECHFINTECH

Everything you need

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

Webhook First

Real-time notifications for inactivity, claims, and transfers. HMAC-signed for security.

Enterprise Security

PII encryption, audit logs, RLS policies, and private storage for death certificates.

Inactivity Monitoring

Configurable timeouts, warning windows, and automated ownership transfers.

Multi-Party Workflows

Beneficiaries, trusted contacts, admins, and owners – all with clear state machines.

Global Scale

Built on Supabase, deployed to edge. Ready for millions of users.

Developer First

REST API, API keys, detailed docs, and SDKs for every popular language.

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.

  • End-to-end encryption for PII
  • Audit logs for every action
  • SOC 2 Type II compliant (in progress)
  • GDPR ready
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://..."
  }'

Start building with NEXTKIN today

Join developers who are building the future of digital inheritance.

Get your API keys – freeExplore documentation