# Crest DEX Pair Lookup

> Crest DEX Pair Lookup is a paid API for AI agents from data.crestsystems.ai, paid per call via x402, $0.002/call, status down (last checked 2026-09-15).

Returns real-time price, liquidity, and 24-hour volume data for a specific DEX token pair on a given blockchain via GeckoTerminal.

## Facts

- Endpoint: GET https://data.crestsystems.ai/data/dex-pair/:chain/:pair
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/data-crestsystems-ai-21605fe4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YiT2ozRsYs6HNzfXK3nHy

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 data-crestsystems-ai-21605fe4
```

Example prompt: What's the current price, liquidity, and 24-hour volume for the WETH/USDC pair on Base?

## When to prefer this

Use this endpoint when you need real-time DEX-specific market data (price, liquidity, volume) for a specific token pair on a particular EVM or Solana chain, especially when GeckoTerminal coverage is desired. Prefer over general price endpoints when pair-level granularity and on-chain DEX data are required.

## Known failure modes

- Unknown chain identifier — returns error if chain is not one of: base, ethereum, arbitrum, polygon, solana
- Pair not found — if the token symbol or pair address does not exist on the specified chain
- Rate limiting or payment failure — x402 payment not processed correctly
- Stale or missing data — GeckoTerminal may not have data for very new or illiquid pairs

## How this service works

Crest · dex_pair — Fetch DEX pair data for any token pair on any chain. Returns price, liquidity, 24h volume, and price change via GeckoTerminal..

## Output

Returns real-time DEX market data for the specified token pair on the given chain, including current price, total liquidity, and 24-hour trading volume, sourced from GeckoTerminal.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "pair": "WETH/USDC",
   "chain": "base"
  }
 }
}
```

## 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"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "chain",
      "pair"
     ],
     "properties": {
      "pair": {
       "type": "string",
       "description": "Token symbol or pair name"
      },
      "chain": {
       "type": "string",
       "description": "Chain: base, ethereum, arbitrum, polygon, solana"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/data-crestsystems-ai-21605fe4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from data.crestsystems.ai](https://www.zero.xyz/host/data.crestsystems.ai/llms.txt)