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Each API is a product of its own, with its own credentials, sandbox and changelog, and is documented end to end: an overview, guides, concepts and a reference you can try against sandbox. Your Securitize contact arranges sandbox access and production keys. Your coding agent reads every API through the MCP server.

Investor onboarding

Bring the investors you have already verified to Securitize.
SecId API

Onboard investors you have already verified. Securitize relies on your KYC and screens every investor against sanctions and PEP lists.

ProtocolREST
AuthenticationOAuth 2.0 client credentials
Overview API referencePostmanChangelog

Trading

Trade tokenized stocks, and the shares behind them.
Stocks APIBeta

Offer tokenized US-listed stocks, ISTs and CETs, to the investors you onboard. The investor signs each order in their own wallet.

ProtocolREST
AuthenticationAPI key
Overview API referenceChangelog
CET Underlying API

Buy and sell the shares underlying CETs over one WebSocket. Securitize mints and burns the CETs as your orders fill.

ProtocolWebSocket
AuthenticationEd25519-signed messages
Overview API referenceChangelog

Asset servicing

Follow what happens to tokenized assets after they are issued.
Corporate Actions APIBeta

Corporate actions on the CETs you list and the trading status of each token, pushed to your webhook, replayable and queryable.

ProtocolREST and webhooks
AuthenticationOAuth 2.0 client credentials
Overview API referenceChangelog
Investor Activity API

The activity of your investor account in tokenized funds: subscriptions, redemptions, reinvested distributions and holdings, pushed to your webhook and readable on request.

ProtocolREST and webhooks
AuthenticationOAuth 2.0 client credentials
Overview API referenceChangelog

Using more than one

  • The Stocks API trades for investors you onboard with the SecId API: an investor needs a verified status and suitability there first. See Prepare an investor to trade.
  • Each API documents its own base URL and credentials on its Sandbox and authentication page.