REST/JSON API giving institutional issuers and partners programmatic access to tZERO transfer-agent, tokenization and custody operations: investors and holdings, securities and cap tables, book-entry transfers, issuance requests, documents, dividends, corporate actions, voting proposals, settlement instructions, omnibus investor accounts, token deployments, custody vaults/whitelists, and HMAC-signed webhooks. Authenticated with an X-API-Key header carrying scoped permissions.
tZERO Institutional API is one of 3 APIs that tZERO publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include Transfer Agent, Tokenization, Custody, Corporate Actions, and Webhooks. The published artifact set on APIs.io includes an OpenAPI specification and an API reference.
This API exposes
102 operations
across 86 paths,
organized into 19 resource areas,
and defines 36 schemas.
It is described by OpenAPI 3.0.3, at version 1.1.0.
Requests are made against a single base URL, https://api.t0direct.com.
102 operations86 paths36 schemas3 DELETE57 GET3 PATCH36 POST3 PUT
Metadata
The identity and technical contract details declared by the specification.
tZERO Institutional API declares
1 security scheme
for authenticating requests.
An API key is passed in the header as X-API-Key (ApiKeyAuth).
By default, every request must be authenticated.
ApiKeyAuth — API key generated at app.t0kenizer.com/ta/api-keys
Paths & Operations 102
Across 86 paths, the API surfaces 102 operations — 3 DELETE, 57 GET, 3 PATCH, 36 POST, 3 PUT. They span 19 resource areas, including Investors, Securities, Transfers, Issuances, Documents, Webhooks, Settlements, InvestorAccounts, and 11 more. Each is listed below with its method, path, parameters, and response codes.
Investors 5
Investor KYC, accreditation, and holdings management
GET
/api/v1/investors/
List investors
6 params→ 200401403
POST
/api/v1/investors/
Create investor
body→ 201400401403500
GET
/api/v1/investors/{id}
Get investor
1 param→ 200401403404
PATCH
/api/v1/investors/{id}
Update investor
1 parambody→ 200400401403404
GET
/api/v1/investors/{id}/holdings
Get investor holdings
1 param→ 200401403404
Securities 4
Security and instrument definitions
GET
/api/v1/securities/
List securities
4 params→ 200401403
GET
/api/v1/securities/{id}
Get security
1 param→ 200401403404
GET
/api/v1/securities/{id}/captable
Get cap table
4 params→ 200401403404
GET
/api/v1/securities/{id}/holders
List security holders
4 params→ 200401403404
Transfers 5
Book-entry transfer requests (secondary)
GET
/api/v1/transfers/
List transfer requests
6 params→ 200401
POST
/api/v1/transfers/
Submit transfer request
body→ 201400401
GET
/api/v1/transfers/{id}
Get transfer request
1 param→ 200401404
POST
/api/v1/transfers/batch
Batch submit transfer requests
body→ 201400401
PATCH
/api/v1/transfers/{id}/status
Approve or reject transfer
1 parambody→ 200400401404
Issuances 5
Primary share issuance requests
GET
/api/v1/issuances/
List issuance requests
5 params→ 200401
POST
/api/v1/issuances/
Submit issuance request
body→ 201400401
GET
/api/v1/issuances/{id}
Get issuance request
1 param→ 200401404
POST
/api/v1/issuances/{id}/approve
Approve issuance request
1 parambody→ 200401404
POST
/api/v1/issuances/{id}/reject
Reject issuance request
1 parambody→ 200401404
Documents 6
Investor document upload and retrieval
GET
/api/v1/documents/
List documents
4 params→ 200
GET
/api/v1/documents/{id}
Get document
1 param→ 200404
DELETE
/api/v1/documents/{id}
Delete document
1 param→ 204404
GET
/api/v1/documents/{id}/download
Get short-lived download URL
1 param→ 200
POST
/api/v1/documents/upload-url
Request document upload URL
body→ 201400503
PUT
/api/v1/documents/upload/{uploadToken}
Confirm document upload
1 param→ 200400410
Webhooks 6
Webhook subscription management and event delivery
GET
/api/v1/webhooks/events
List available webhook events
→ 200
GET
/api/v1/webhooks/
List webhook subscriptions
2 params→ 200500
POST
/api/v1/webhooks/
Create webhook subscription
body→ 201400
PATCH
/api/v1/webhooks/{id}
Update webhook subscription
1 parambody→ 200404
DELETE
/api/v1/webhooks/{id}
Delete webhook subscription
1 param→ 204404
POST
/api/v1/webhooks/{id}/test
Send test webhook event
1 param→ 200404
Settlements 10
GET
/api/v1/settlements/
List settlement instructions
→ 200
POST
/api/v1/settlements/
Submit settlement instruction
→ 200
GET
/api/v1/settlements/{id}
Get settlement instruction
1 param→ 200
POST
/api/v1/settlements/{id}/approve
Approve settlement instruction
1 param→ 200
POST
/api/v1/settlements/{id}/reject
Reject settlement instruction
1 param→ 200
POST
/api/v1/settlements/{id}/cancel
Cancel settlement instruction
1 param→ 200
POST
/api/v1/settlements/{id}/execute
Manually execute approved settlement
1 param→ 200
POST
/api/v1/settlements/{id}/reverse
Create reversal of an executed settlement
1 param→ 200
GET
/api/v1/settlements/configs
List settlement configs (issuer + per-security)
→ 200
PUT
/api/v1/settlements/configs
Upsert settlement config (issuer default or per-security override)
→ 200
InvestorAccounts 3
GET
/api/v1/investor-accounts/
List investor accounts
→ 200
POST
/api/v1/investor-accounts/
Create investor account (omnibus parent or sub-account)
→ 200
POST
/api/v1/investor-accounts/{id}/reconcile
Run omnibus reconciliation snapshot (parent vs Σ(children))
1 param→ 200
Dividends 7
Dividend declarations (cash & stock) — review-gated; on-chain execution via the dividend claim contract
GET
/api/v1/dividends/
List dividends
→ 200
POST
/api/v1/dividends/
Declare a dividend (enters tZERO review)
→ 200
GET
/api/v1/dividends/{id}
Get a dividend with payment rollups
1 param→ 200
GET
/api/v1/dividends/{id}/funding
Get USDC funding deposit instructions for a CASH dividend
1 param→ 200
GET
/api/v1/dividends/{id}/reconciliation
Reconcile a dividend: declared vs distributed
1 param→ 200
GET
/api/v1/dividends/payment-tokens
List approved payment tokens for a security
→ 200
POST
/api/v1/dividends/{id}/cancel
Cancel a dividend
1 param→ 200
Corporate Actions 4
Splits, mergers and other corporate actions — review-gated; on-chain splits broadcast via Fireblocks
GET
/api/v1/corporate-actions/
List corporate actions
→ 200
POST
/api/v1/corporate-actions/
Declare a corporate action (enters tZERO review)
→ 200
GET
/api/v1/corporate-actions/{id}
Get a corporate action
1 param→ 200
POST
/api/v1/corporate-actions/{id}/cancel
Cancel a corporate action
1 param→ 200
Proposals 5
Shareholder voting — proposal creation and results; off-chain or on-chain (anchored) voting modes
The contract defines 36 schemas that model the data the API accepts and returns. The most detailed are def-2 (22 properties), TokenConfig (22 properties), Investor (18 properties), def-10 (18 properties). Each schema is shown below with its type and property counts.
PaginationMeta
object
4 properties
ErrorResponse
object
2 properties
TokenConfig
object
A token configuration (the blueprint). Deployments are its on-chain instances.
22 properties
Deployment
object
An on-chain instance of a token configuration on a specific chain/network.
10 properties
Operation
object
A logged on-chain operation against a deployment (MINT, BURN, TRANSFER, …).
7 properties
CustodyWallet
object
An asset wallet inside a custody vault.
5 properties
CustodyVault
object
A Fireblocks-backed custody vault owned by the issuer.
6 properties
CustodyTransfer
object
A transfer of assets out of a custody vault.
11 properties
WhitelistedAddressAsset
object
4 properties
WhitelistedAddress
object
An external address approved to receive transfers from custody.
9 properties
Investor
object
18 properties
InvestorHolding
object
7 properties
Security
object
18 properties
SecurityHolder
object
7 properties
TransferRequest
object
8 properties
IssuanceRequest
object
17 properties
Document
object
13 properties
WebhookSubscription
object
6 properties
def-0
object
4 properties
def-1
object
2 properties
def-2
object
A token configuration (the blueprint). Deployments are its on-chain instances.
22 properties
def-3
object
An on-chain instance of a token configuration on a specific chain/network.
10 properties
def-4
object
A logged on-chain operation against a deployment (MINT, BURN, TRANSFER, …).
7 properties
def-5
object
An asset wallet inside a custody vault.
5 properties
def-6
object
A Fireblocks-backed custody vault owned by the issuer.
6 properties
def-7
object
A transfer of assets out of a custody vault.
11 properties
def-8
object
4 properties
def-9
object
An external address approved to receive transfers from custody.
9 properties
def-10
object
18 properties
def-11
object
7 properties
def-12
object
18 properties
def-13
object
7 properties
def-14
object
8 properties
def-15
object
17 properties
def-16
object
13 properties
def-17
object
6 properties
Specification
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