# Cardano Top of Order Book

> Cardano Top of Order Book is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Returns the best bid and ask prices (top of book) from the Cardano (ADA-USD) order book on Coinbase Exchange

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/demand-market-cardano-orderbook-top?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cardano-top-of-order-book-4eb90db7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Mg-FGozwrBozZT6vdvayk

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 cardano-top-of-order-book-4eb90db7 -d '<json body>'
```

Example prompt: What's the current best bid and ask for Cardano (ADA-USD) on Coinbase right now? I want to see the top of the order book.

## When to prefer this

Use this endpoint when you need a real-time, point-in-time snapshot of the best bid and ask for Cardano (ADA-USD) specifically from Coinbase Exchange. Prefer this over full order book endpoints when you only need the top-of-book quote, not full depth. Ideal for trading bots, price alerting, spread monitoring, and portfolio mark-to-market workflows where low latency and Coinbase-sourced data is required.

## Known failure modes

- Invalid product ID returns an error — only valid Coinbase USD product IDs (default: ADA-USD) are accepted
- Coinbase Exchange API downtime or rate limiting may cause failed responses
- Stale or delayed data during periods of extreme market volatility
- Network timeout if the upstream Coinbase feed is unavailable

## How this service works

Cardano Top of order book: Return the best bid and ask levels from the public order book. Coinbase Exchange public USD market data; not investment advice.

## Output

Returns the best bid price and best ask price from the live Cardano (ADA-USD) order book on Coinbase Exchange, representing the highest price a buyer will pay and the lowest price a seller will accept at the moment of the query.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "product": {
   "type": "string",
   "default": "ADA-USD",
   "description": "Coinbase USD product ID; defaults to ADA-USD."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cardano-top-of-order-book-4eb90db7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)