# PreFlight Cross-Venue Price Check

> PreFlight Cross-Venue Price Check is a paid API for AI agents from meryol-agenticmarket-x402.hf.space, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Fetches cross-source token price data including median price, spread in basis points, and per-source quotes for a given token on a specified EVM chain

## Facts

- Endpoint: GET https://meryol-agenticmarket-x402.hf.space/price/cross/%7Bchain%7D/%7Btoken%7D
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/preflight-cross-venue-price-check-cc499e33
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Qe5H6V-ob87CURQ0I8UFX

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 preflight-cross-venue-price-check-cc499e33
```

Example prompt: Before I swap, check the cross-venue price of ETH on Base and tell me the median price and how wide the spread is across CoinGecko and DexScreener.

## When to prefer this

Use this endpoint when an AI agent needs to verify a token's price across multiple venues before executing a trade or signing a transaction on an EVM chain (Ethereum, Base, Arbitrum, Optimism). Ideal for pre-trade sanity checks to detect price manipulation, stale oracles, or abnormal spreads. Prefer this over single-source price feeds when cross-venue validation and spread analysis are needed.

## Known failure modes

- Unsupported chain or token returns an error or empty sources array
- Token not listed on one or more price sources results in partial data
- Network timeout if price feeds are slow to respond
- Invalid chain or token path parameter returns a 4xx error
- Stale or unavailable oracle data may return no sources

## How this service works

Pre-trade & pre-sign checks for autonomous agents: everything an agent verifies BEFORE signing a transaction — token due diligence, calldata red-flag decoding, oracle freshness, holder concentration, bridge routing with executable calldata, cross-venue perp funding, gas and price sanity checks. EVM chains: Ethereum, Base, Arbitrum, Optimism.

## Output

Returns a JSON object with the chain name, token requested, median price in USD, spread in basis points, and an array of per-source price quotes (e.g. CoinGecko, DexScreener) with individual prices and optional notes. Useful for detecting price inconsistencies before signing a trade.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "base",
  "notes": [],
  "sources": [
   {
    "note": null,
    "source": "coingecko",
    "price_usd": 3120.1
   },
   {
    "note": null,
    "source": "dexscreener",
    "price_usd": 3121.32
   }
  ],
  "requested": "eth",
  "spread_bps": 12,
  "median_price_usd": 3120.45
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/preflight-cross-venue-price-check-cc499e33/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from meryol-agenticmarket-x402.hf.space](https://www.zero.xyz/host/meryol-agenticmarket-x402.hf.space/llms.txt)