Futuros de gás natural Henry Hub da NYMEX.
curl "https://metalapi.com/api/v1/latest?api_key=YOUR_API_KEY&base=USD¤cies=NATURALGAS"{
"success": true,
"base": "USD",
"rates": {
"NATURALGAS": 0.3278688525,
"USDNATURALGAS": 3.05
}
}