# Public

**Canonical:** https://apis.io/providers/public/  
**Website:** https://public.com  
**APIs profiled:** 1

Public (Public Holdings, Inc.) is a multi-asset investing platform where people can trade stocks, ETFs, options, index options, crypto, bonds, and treasuries, and hold IRAs, direct indexing, high-yield cash, and margin in one account. Public positions itself as an "agentic brokerage" and ships a public Trading API (api.public.com) that lets developers programmatically manage accounts, pull market data, and place equity, crypto, and options orders with commission-free execution and options rebates. It also operates a hosted, OAuth-secured MCP server (mcp.public.com) so AI assistants like Claude and ChatGPT can query portfolios and trade on a user's behalf, alongside an official Python SDK, command-line interface, and Postman collection. Backed by Accel.

## Kin Score — 39.5 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 39.5).

| Facet | Score |
|---|---|
| Discoverability | 87.0 |
| Contract Quality | 0.0 |
| Governance | 18.2 |
| Contract Governance | 18.2 |
| Operational Transparency | 18.4 |
| Developer Ergonomics | 69.0 |
| Commercial Clarity | 44.7 |
| Access Clarity | 44.7 |

Regulatory layer — **Securities & Market Data**: 58.3 (matched via tags).

## Agent readiness — 18.8 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | verified |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (1)

- **Public Trading API** — REST API for programmatic trading on Public — manage brokerage accounts, pull portfolio and transaction history, retrieve market data (quotes, bars, option chains, greeks), and ...

## MCP servers (1)

- **Public MCP Server** — Public's hosted, remote MCP server — described by Public as part of "the world's first agentic brokerage." Lets AI assistants query portfolios and place trades on a connected Pu...

## Security (2)

- **Public Authentication** — http/oauth2 · 2 schemes
- **Public Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Company, Consumer, Investing, Brokerage, Trading, Fintech, Stocks, Options, Crypto, Market Data, Agentic, MCP

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/public/). Scores are computed from the provider's own public artifacts under a published rubric.