The Digital Legacy API
NEXTKIN is the REST + webhook layer for inactivity monitoring, verified ownership transfer, and end-of-life account succession.
Authentication
Per-app API keys and HMAC-signed webhook secrets. Rotate without downtime.
REST API (v1)
Register monitored users, send activity pings, manage beneficiaries, and resolve claims.
Webhook events
Reliable, signed deliveries with retries: user.*, verification.*, claim.*, transfer.*.
Compliance
RLS-backed storage for sensitive documents. Audit log on every state change.
What YOU build, by industry
NEXTKIN handles the backend. You build the user interface inside your own product.
Social Media
YouTube, TikTok, Instagram, Facebook
Digital Legacy Settings page
User-facingSection inside the user's account settings where they manage inheritance.
Beneficiary Registration Form
User-facingUser designates who inherits their account.
Beneficiary Management List
User-facingView, edit, or remove existing beneficiaries with a primary indicator.
Confirmation Screen
User-facingAfter saving, show "Beneficiary saved successfully".
- Inactivity warning email sent from your domain
- Claim submission page for beneficiaries to upload a death certificate
- Push notifications when a claim is filed against the account
Important
NEXTKIN never shows UI to your end users. You must build all of these components inside your own application — NEXTKIN only provides the backend API and webhook events.
Coming soon
- · Full OpenAPI 3.1 spec
- · Interactive request explorer
- · Official SDKs (Node, Python, Go)
- · Webhook event reference
- · Migration guide from legacy endpoints
- · Sandbox environment
Full reference docs are rolling out. Sign up for early access to the developer console and OpenAPI spec.