tZERO

tZERO Technologies is a US financial-technology company building regulated infrastructure for tokenized real-world assets and digital securities. Through its SEC- and FINRA-regulated broker-dealer, Alternative Trading System (tZERO ATS, continuously operating since 2019), special purpose broker-dealer for digital custody, and SEC-registered transfer agent, tZERO covers the full lifecycle: capital formation and token issuance, secondary trading and market data, clearance and settlement, cap-table recordkeeping, corporate actions, dividends and proxy voting. Its developer surface — marketed as tZERO Connect — publishes two public OpenAPI 3.0.3 contracts (an Issuance & Secondary Markets REST API on gateway-web-api.tzero.com and an Institutional transfer-agent / tokenization / custody API on api.t0direct.com) alongside FIX 4.2 / 4.4 specifications for order entry, drop copy and market data.

tZERO publishes 2 APIs on the APIs.io network: Issuance & Secondary Markets API and Institutional API. Tagged areas include Company, Digital Securities, Tokenization, Capital Markets, and Trading.

The tZERO catalog on APIs.io includes 1 event-driven AsyncAPI specification.

tZERO’s developer surface includes authentication, documentation, API reference, getting-started guide, support, engineering blog, signup flow, and 30 more developer resources.

🌐 Visit website 📡 Source on GitHub

50.3/100 developing ▬ flat Agent 43/100 agent native Full breakdown ↓
scored 2026-09-02 · rubric v0.18.0

AccessSelf serve

3 APIs

Company Digital Securities Tokenization Capital Markets Trading Alternative Trading SystemTransfer AgentCustody BlockchainFinancial ServicesSecurities Market Data FIX Protocol

Kin Score

Kin Score How this is scored →
scored 2026-09-02 · rubric v0.18.0

Composite quality — 50.3/100 · developing

Contract Quality 11.9 / 21

Developer Ergonomics 10.0 / 17

Access Clarity 7.2 / 17

Operational Transparency 3.2 / 11

Contract Governance 1.9 / 10

Discoverability 5.5 / 9

Regulatory Posture 9.0 / 15

Agent readiness — 43/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Surface 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/tzero: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

ErrorCatalog

ErrorCodes

Lifecycle

Conformance

DataModel

Webhooks

Scroll for all 8

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Compliance

Compliance

Operate 3

Status, limits, changes, and where to get help

Support

Support

ChangeLog

ChangeLog

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

TermsOfService

PrivacyPolicy

LegalHub

Plans

Company 4

The organization behind the API

Website

Website

Blog

Blog

Careers

Careers

LinkedIn

Other 4

Properties that don't map to a standard resource type

Company

Company

Overlay

Overlay

Overlay

Overlay

Source (apis.yml)

aid: tzero
name: tZERO
description: 'tZERO Technologies is a US financial-technology company building regulated infrastructure for tokenized real-world
  assets and digital securities. Through its SEC- and FINRA-regulated broker-dealer, Alternative Trading System (tZERO ATS,
  continuously operating since 2019), special purpose broker-dealer for digital custody, and SEC-registered transfer agent,
  tZERO covers the full lifecycle: capital formation and token issuance, secondary trading and market data, clearance and
  settlement, cap-table recordkeeping, corporate actions, dividends and proxy voting. Its developer surface — marketed as
  tZERO Connect — publishes two public OpenAPI 3.0.3 contracts (an Issuance & Secondary Markets REST API on gateway-web-api.tzero.com
  and an Institutional transfer-agent / tokenization / custody API on api.t0direct.com) alongside FIX 4.2 / 4.4 specifications
  for order entry, drop copy and market data.'
url: https://raw.githubusercontent.com/api-evangelist/tzero/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  - rate-limits
  - security
  generated: '2026-09-02'
  method: derived
image: https://tzero.com/api/sanity-assets/images/jpd7ydtd/pre-prod/bcb9e8e2a5c5bf41d9938781a368d92635b0923a-595x156.svg?w=1200&h=627&fit=crop&auto=format
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-09-01'
modified: '2026-09-01'
tags:
- Company
- Digital Securities
- Tokenization
- Capital Markets
- Trading
- Alternative Trading System
- Transfer Agent
- Custody
- Blockchain
- Financial Services
- Securities
- Market Data
- FIX Protocol
apis:
- aid: tzero:issuance-secondary-markets
  name: tZERO Issuance & Secondary Markets API
  description: REST/JSON API for creating individual broker-dealer accounts, triggering and reviewing KYC on investors, browsing
    primary offerings and managing investments, linking bank accounts and moving funds, reading balances, retrieving market
    schedules and public price history/snapshots, and placing, listing and cancelling orders on the tZERO ATS. Authenticated
    with an x-apikey header plus a bearer JWT obtained from POST /auth/v1/api/token.
  humanURL: https://apidocs.tzero.com/docs/explorer
  baseURL: https://gateway-web-api.tzero.com/app
  tags:
  - Trading
  - Onboarding
  - KYC
  - Investments
  - Market Data
  properties:
  - type: OpenAPI
    url: openapi/tzero-issuance-secondary-markets-openapi.json
  - type: Documentation
    url: https://apidocs.tzero.com/docs
  - type: APIReference
    url: https://apidocs.tzero.com/docs/explorer
- aid: tzero:institutional
  name: tZERO Institutional API
  description: '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.'
  humanURL: https://apidocs.tzero.com/docs/institutional
  baseURL: https://api.t0direct.com/api/v1
  tags:
  - Transfer Agent
  - Tokenization
  - Custody
  - Corporate Actions
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/tzero-institutional-openapi.json
  - type: APIReference
    url: https://api.t0direct.com/api/v1/docs/
- aid: tzero:fix
  name: tZERO FIX API
  description: FIX 4.2 / 4.4 protocol surface for low-latency order entry, drop-copy execution reports, market data (snapshot
    and incremental refresh, trading session status, security status) and Indication of Interest (IOI) market data against
    the tZERO ATS. Message-by-message specifications are published on the tZERO API docs site; session credentials and connectivity
    are arranged with tZERO.
  humanURL: https://apidocs.tzero.com/docs/fix
  tags:
  - FIX Protocol
  - Order Entry
  - Market Data
  - Drop Copy
  properties:
  - type: Documentation
    url: https://apidocs.tzero.com/docs/fix
  x-transport: FIX 4.2 / 4.4 over TCP; session host, port, CompIDs and credentials are arranged with tZERO and are not published
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/tzero-agentic-access.yml
- type: DomainSecurity
  url: security/tzero-domain-security.yml
- type: Authentication
  url: authentication/tzero-authentication.yml
- type: Website
  url: https://www.tzero.com/
- type: DeveloperPortal
  url: https://apidocs.tzero.com/docs
- type: Documentation
  url: https://apidocs.tzero.com/docs
- type: APIReference
  url: https://apidocs.tzero.com/docs/explorer
- type: GettingStarted
  url: https://apidocs.tzero.com/docs
- type: Support
  url: https://www.tzero.com/contact
- type: Blog
  url: https://www.tzero.com/content-hub
- type: GitHubOrganization
  url: https://github.com/tZERO-dev
- type: SignUp
  url: https://platform.tzero.com/tzero/register
- type: Login
  url: https://platform.tzero.com/tzero/auth
- type: TermsOfService
  url: https://storage.googleapis.com/public-disclosures.tzero.com/tZERO_MasterTermsofUse.pdf
- type: PrivacyPolicy
  url: https://storage.googleapis.com/public-disclosures.tzero.com/Privacy-Policy-and-Privacy-Notices-(TDAS-and-tZERO-Securities).pdf
- type: LegalHub
  url: https://www.tzero.com/legal
- type: Company
  url: https://www.tzero.com/company
- type: Careers
  url: https://www.tzero.com/careers
- type: LinkedIn
  url: https://www.linkedin.com/company/tzero/
- type: X
  url: https://x.com/tZERO
- type: Conventions
  url: conventions/tzero-conventions.yml
- type: Idempotency
  url: conventions/tzero-conventions.yml
- type: ErrorCatalog
  url: errors/tzero-problem-types.yml
- type: ErrorCodes
  url: errors/tzero-error-codes.yml
- type: Lifecycle
  url: lifecycle/tzero-lifecycle.yml
- type: ChangeLog
  url: changelog/tzero-changelog.yml
- type: Conformance
  url: conformance/tzero-conformance.yml
- type: Compliance
  url: https://www.tzero.com/legal
- type: DataModel
  url: data-model/tzero-data-model.yml
- type: Webhooks
  url: asyncapi/tzero-institutional-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/tzero-llms.txt
- type: Packages
  url: packages/tzero-packages.yml
- type: Plans
  url: plans/tzero-plans-pricing.yml
- type: RateLimits
  url: rate-limits/tzero-rate-limits.yml
- type: Overlay
  url: overlays/tzero-issuance-secondary-markets-overlay.yaml
- type: Overlay
  url: overlays/tzero-institutional-overlay.yaml
x-enrichment:
  date: '2026-09-01'
  status: enriched
  artifacts_added: 27
  pass: local-v1

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/tzero"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/tzero/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/tzero/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

tZERO

Kin Score

APIs 3

tZERO Issuance & Secondary Markets API

tZERO Institutional API

tZERO FIX API

Pricing Plans 1

Tzero Plans Pricing

Rate Limits 1

Tzero Rate Limits

Event Specifications 1

Tzero Institutional Webhooks

Security Posture 2

Tzero Authentication

Tzero Domain Security

Agentic Access 1

Tzero Agentic Access