# Proof of Stock

> Is a token the issuer's tokenized stock, and how far does the chain trade from the issuer's price? Base (Coinbase registry) and Robinhood Chain (Robinhood registry). Public read-only MCP server: https://proofofstock.xyz/mcp. Version 0.5.0.

Contact: hello@proofofstock.xyz. Read-only: nothing here trades, signs or holds a key. Not investment advice.

## Start here

- [MCP server](https://proofofstock.xyz/mcp): Streamable HTTP, POST one JSON-RPC message, no key or account; tools: https://proofofstock.xyz/docs/reference/tools.md
- [HTTP API](https://proofofstock.xyz/docs/reference/http-api.md): read-only JSON routes, e.g. https://proofofstock.xyz/verify?chain=base&address=0x…
- [Passport JSON Schema](https://proofofstock.xyz/docs/reference/passport.schema.json): the shape of one passport answer
- [Pre-trade guard for agents](https://proofofstock.xyz/docs/how-to/check-before-listing.md): the @proofofstock/guard package, beforeBuy() refuses a token the issuer did not list (fails closed; not on npm yet)
- [Every page in one file](https://proofofstock.xyz/llms-full.txt)

## Tutorials

- [Connect an agent and read your first passport](https://proofofstock.xyz/docs/tutorials/connect-an-agent.md): In five minutes you will connect an AI agent to the public Proof of Stock server and read the passport of one

## How-to guides

- [Alert when the on-chain price drifts from the issuer's reference](https://proofofstock.xyz/docs/how-to/alert-on-gap.md): Use this when you want to know that a tokenized stock's deepest pool trades more than 0.5% away from its issuer's
- [Check a contract before listing or buying it](https://proofofstock.xyz/docs/how-to/check-before-listing.md): Use this when you are about to list a tokenized stock on a venue, show it in a wallet, or let an agent buy it, and you
- [Compare one stock across Base and Robinhood Chain](https://proofofstock.xyz/docs/how-to/compare-venues.md): Use this when the same share is tokenized on both chains (Coinbase's token on Base, Robinhood's on Robinhood Chain)

## Reference

- [HTTP API](https://proofofstock.xyz/docs/reference/http-api.md): Read-only JSON routes on `https://proofofstock.xyz`. No key, no account, no cookies. (`GET /api/hit` is the site's
- [The passport answer](https://proofofstock.xyz/docs/reference/passport.md): The passport is the answer to "what can be said, with its time and source, about this one token?". It is the body of
- [MCP tools](https://proofofstock.xyz/docs/reference/tools.md): Six read-only tools on a public MCP server. None of them trades, signs or holds a key.

## Explanation

- [Methodology: where the data comes from and what counts as issuer-listed](https://proofofstock.xyz/docs/explanation/methodology.md): This page explains why each of those layers works the way it does. The field-by-field description is in

## More

- [Legal](https://proofofstock.xyz/docs/legal.md): This is the one canonical text for Proof of Stock: the site at proofofstock.xyz, its HTTP API, its MCP
- [Changelog](https://proofofstock.xyz/docs/changelog.md): All notable changes to Proof of Stock. Format: [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).