# Chainlink Bid-Ask Spread Check

> Chainlink Bid-Ask Spread Check 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).

Calculates the latest absolute and percentage bid-ask spread for LINK-USD (or another Coinbase Exchange USD market) using real-time public order book data.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/demand-market-chainlink-spread-check?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/chainlink-bid-ask-spread-check-afd5632f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__XUrdV3WnMgaafu-F6kZx

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 chainlink-bid-ask-spread-check-afd5632f -d '<json body>'
```

Example prompt: What's the current bid-ask spread for Chainlink on Coinbase — give me both the absolute dollar spread and the percentage spread for LINK-USD.

## When to prefer this

Choose this endpoint when you need a quick, cheap real-time snapshot of market tightness for Chainlink (LINK-USD) or another Coinbase USD pair. It is ideal for pre-trade cost estimation, liquidity monitoring, or comparing spread quality across assets. Prefer it over full order book endpoints when you only need the top-of-book spread metric without deeper level-2 data.

## Known failure modes

- Invalid or unsupported product ID returns an error — only Coinbase USD market pairs are supported
- Stale or missing order book data if Coinbase public feed is temporarily unavailable
- No response if the x402 payment of $0.01 USDC fails or is rejected
- Rate limiting if called too rapidly without proper payment headers

## How this service works

Chainlink Bid-ask spread check: Calculate the latest absolute and percentage bid-ask spread. Coinbase Exchange public USD market data; not investment advice.

## Output

Returns the latest absolute bid-ask spread (in USD) and the percentage spread calculated from Coinbase Exchange public order book data for the requested USD trading pair, along with the best bid and ask prices used in the calculation.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chainlink-bid-ask-spread-check-afd5632f/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)