Grade A cathode copper (99.99% purity) from COMEX HG futures. Auto-updated every 15 minutes during trading hours, hourly after hours. On-chain on Base. Available via REST API.
Every tier includes access to all three copper price classes.
Grade A cathode copper. COMEX HG futures. 15-min updates.
Scrap yard call-arounds + COMEX reference. Weekly updates.
Alloys C2182, C180, C110. Verified invoices. 2x/week.
One subscription. All three classes included.
Try it out
For active shops
For manufacturers
Class A auto-updates based on COMEX trading hours.
| Period | Hours (ET) | Frequency | Updates/Day |
|---|---|---|---|
| Trading Hours | 6:00 AM - 8:00 PM | Every 15 min | 56 |
| After Hours | 8:00 PM - 6:00 AM | Every 60 min | 10 |
| Sunday Globex | 6:00 PM - midnight | Every 60 min | 6 |
| Saturday | All day | Paused | 0 |
~66 on-chain updates per weekday. ~$0.07/day in gas on Base.
Simple REST API. Real-time COMEX copper.
https://classa.mj41.me/api/v1Include your API key in the x-api-key header.
curl -H "x-api-key: YOUR_API_KEY" \
https://classa.mj41.me/api/v1/price/priceCurrent COMEX copper priceReturns the latest Class A COMEX spot copper price per pound.
Response:
{
"grade": "Class A",
"type": "COMEX Spot Copper",
"price_per_lb": 4.85,
"currency": "USD",
"updated_at": "2026-05-12T14:15:00Z",
"source": "COMEX HG futures",
"update_mode": "active",
"is_fresh": true,
"tier": "copper_standard",
"bundle": "This key works for Class A, B, and C oracles"
}/price/historyCopper Standard+ onlyReturns historical COMEX prices. Optional ?limit=100 parameter.
/statusNo auth requiredCheck oracle status, freshness, and current update mode. No API key needed.
Python
import requests
resp = requests.get(
"https://classa.mj41.me/api/v1/price",
headers={"x-api-key": "YOUR_API_KEY"}
)
price = resp.json()["price_per_lb"]
print(f"COMEX Copper: ${price}/lb")JavaScript
const resp = await fetch(
"https://classa.mj41.me/api/v1/price",
{ headers: { "x-api-key": "YOUR_API_KEY" } }
);
const { price_per_lb } = await resp.json();
console.log(`COMEX Copper: $${price_per_lb}/lb`);One key gives you access to all three copper price classes — A, B, and C.
Request API KeyFree tier includes 10 calls/month across all three classes with 1-update delay.