> For the complete documentation index, see [llms.txt](https://docs.openmm.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openmm.io/api-reference/price-comparison/price-compare.md).

# GET /price/compare

Compare prices for a trading pair across multiple exchanges.

## Request

```
GET /api/v1/price/compare?symbol={symbol}&exchanges={exchanges}
```

### Parameters

| Parameter | Type   | Required | Default | Description                  |
| --------- | ------ | -------- | ------- | ---------------------------- |
| symbol    | string | ✅        | —       | Trading pair                 |
| exchanges | string | ❌        | all     | Comma-separated exchange IDs |

## Response

```json
{
  "symbol": "BTC/USDT",
  "prices": [
    {
      "exchange": "mexc",
      "price": 42150.00,
      "bid": 42148.00,
      "ask": 42152.00,
      "spread": 4.00,
      "spreadPercent": 0.0095,
      "timestamp": 1710000000000
    },
    {
      "exchange": "gateio",
      "price": 42145.00,
      "bid": 42143.00,
      "ask": 42147.00,
      "spread": 4.00,
      "spreadPercent": 0.0095,
      "timestamp": 1710000000000
    }
  ],
  "analysis": {
    "lowestAsk": {
      "exchange": "gateio",
      "price": 42147.00
    },
    "highestBid": {
      "exchange": "mexc",
      "price": 42148.00
    },
    "spread": 1.00,
    "spreadPercent": 0.0024,
    "arbitrageOpportunity": true
  },
  "timestamp": 1710000000000
}
```

### Analysis Fields

| Field                | Type    | Description                   |
| -------------------- | ------- | ----------------------------- |
| lowestAsk            | object  | Best exchange to buy          |
| highestBid           | object  | Best exchange to sell         |
| spread               | number  | Cross-exchange spread         |
| spreadPercent        | number  | Spread as percentage          |
| arbitrageOpportunity | boolean | True if profitable arb exists |

## Examples

```bash
# Compare across all exchanges
curl "http://localhost:3000/api/v1/price/compare?symbol=BTC/USDT"

# Compare specific exchanges
curl "http://localhost:3000/api/v1/price/compare?symbol=ETH/USDT&exchanges=mexc,kraken"
```

## Arbitrage Detection

When `arbitrageOpportunity` is `true`:

* Buy at `lowestAsk.exchange` at `lowestAsk.price`
* Sell at `highestBid.exchange` at `highestBid.price`
* Gross profit = `spread`

⚠️ Consider trading fees, withdrawal fees, and transfer times before executing.

## Errors

| Code | Error          | Description                  |
| ---- | -------------- | ---------------------------- |
| 400  | Invalid symbol | Symbol format incorrect      |
| 500  | Fetch failed   | One or more exchanges failed |


---

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