# Ozmium Tokenized U.S. Stocks on Base (B20) Directory

> Ozmium Tokenized U.S. Stocks on Base (B20) Directory is a paid API for AI agents from ozmium.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-16).

Returns the full list of Coinbase-issued tokenized U.S. stocks on Base, including each token's contract address, underlying ticker, live Chainlink USD price with timestamp, and minted supply.

## Facts

- Endpoint: GET https://ozmium.org/v1/stocks
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ozmium-tokenized-u-s-stocks-on-base-b20-directory-5d6e6dd1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nAwEdl6GTLfWm3ySTaAKz

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ozmium-tokenized-u-s-stocks-on-base-b20-directory-5d6e6dd1
```

Example prompt: Can you pull up the full list of Coinbase tokenized U.S. stocks on Base — I want to see which tickers are available, their current on-chain USD prices from Chainlink, contract addresses, and how much has been minted so far?

## When to prefer this

Choose this endpoint when you need a single authoritative directory of all Coinbase-issued tokenized U.S. equities on Base, including live Chainlink prices and contract addresses — ideal for pre-trade research, DeFi integration, portfolio valuation, or arbitrage discovery involving on-chain real-world assets. Prefer this over generic DEX price APIs when you specifically need the official B20 contract registry or Chainlink-sourced prices for tokenized stocks.

## Known failure modes

- API returns 402 Payment Required if x402 USDC micropayment is not attached
- Price data may be stale outside 24/5 market hours (Chainlink feeds pause on weekends/holidays)
- Minted supply of 0 does not imply the token is unavailable — it means no secondary liquidity exists yet
- Network errors or Base RPC timeouts may result in incomplete or cached data
- Regulation S compliance: the endpoint does not serve U.S. persons; agents operating in restricted jurisdictions may be blocked or data may be withheld

## How this service works

Coinbase's tokenized U.S. stocks on Base (B20): each token's contract, underlying ticker, live Chainlink 24/5 price (USD) with updatedAt, and minted supply (0 = no secondary liquidity yet; the quote decides). GET /v1/stocks. Secondary trading is permissionless on-chain; Regulation S, not for U.S. persons or other restricted jurisdictions.

## Output

A JSON list of all Coinbase-issued tokenized U.S. stock tokens on Base (B20 program), each entry containing: the ERC-20 contract address on Base, the underlying stock ticker symbol (e.g. AAPL, TSLA), the live Chainlink USD price and the timestamp it was last updated (24/5 trading hours), and the current minted supply (0 indicates no secondary market liquidity yet).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "data": {
       "type": "object",
       "properties": {
        "ok": {
         "type": "boolean"
        }
       }
      },
      "network": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ozmium-tokenized-u-s-stocks-on-base-b20-directory-5d6e6dd1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ozmium.org](https://www.zero.xyz/host/ozmium.org/llms.txt)