The Open Agent API is the backend for openagent.to, a transfer agency platform. It exposes the registrar of record for digital securities: who holds what, how holdings moved, and the compliance reports drawn from both.
All requests go to https://api.openagent.to. Every path in this reference is versioned under /api/v1.

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What you can do

Investors

Look up investor records and the securities each one holds.

Securities & issuers

Read the security master and the issuers behind it.

Transactions

The journal ledger, transfers, holder positions and registrar journal.

Reports

Control book, MSHF and turnaround reports, including the monthly roll-up.

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Before you start

1

Get credentials

Staff and customer integrations authenticate with a JWT. Server-to-server callers use an issuer API key. See Authentication.
2

Learn the envelope

Every response — success or failure — is wrapped in a standard envelope, and every list endpoint pages the same way. See Conventions.
3

Make a call

GET /api/v1/health needs no credentials and confirms you can reach the API.

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Receiving events

The issuer platform pushes reconciliation events to POST /api/v1/webhook/sync. That endpoint is signed with an HMAC and rejects replayed requests — read Webhooks before integrating against it.

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Keeping up

Behaviour changes are published in the changelog, which has an RSS feed at /rss.xml.