Here is a list of emini futures and trading margins at the time of this posting.  Margins will be different from broker to broker and over time.  This data is from Global Futures.com

Name | Symbol | Overnight Margin | Intraday Margin

miNY Crude Oil QM NYMEX $2475 $1,500
miNY Heating Oil QH NYMEX $2365 $1,700
miNY Natural Gas QG NYMEX $578 $578
miNY RBOB Gasoline QU NYMEX $2500 $1800
E-Mini Euro FX E7 CME $1238 $500
E-mini Japanese Yen J7 CME $1705 $500
Euro FX Currencies 6E CME $2475 $900
E-Mini NASDAQ NQ CME $2200 $400*
E-Mini S&P ES CME $3850 $400*
E-mini S&P MIDCAP 400 EMD CME $4400 $500
Mini Russell 2000 TF ICE $4400 $500*
Mini Gold YG NLI $2970 $500
Mini Silver YI NLI $2750 $1,000

Now just because a future is an ’emini’ doesn’t mean that other contracts don’t have even smaller margin requirements such as:

 

Australian Dollar 6A CME $1650 $675
British Pound 6B CME $1320 $900
Canadian Dollar 6C CME $1100 $500
E-Mini Euro FX E7 CME $1238 $500
E-mini Japanese Yen J7 CME $1705 $500
Euro FX Currencies 6E CME $2475 $900
Japanese Yen 6J CME $3410 $900
Swiss Franc 6S CME $2200 $400

Of course you can also trade the Forex versions of currency futures as well as spot gold and spot euro gold as well.

10 Yr US T-Note ZN CME $1485 $400
2 Yr T-Note ZT CME $304 $304
30 Yr US T-Bonds ZB CME $3375 $500
5 Yr T-Note ZF CME $742 $300
Euro Dollar GE CME $742 $500
Euro Bobl FGBM EUREX € 1590 $350
Euro Bund FGBL EUREX € 3360 $300
Long Gilt GLTL LIFFE $3000 $500
Euro Schatz FGBS EUREX € 450 $350
Short Sterling STERL LIFFE £ 350 $622
Three-Month Euribor FEU3 LIFFE € 500 $600

Then you also have the Micro contracts which have en even small margin requirement:

E-Micro AUD/USD M6A CME $165 $150
E-Micro GBP/USD M6B CME $132 $132
E-Micro USD/CAD M6C CME $187 $150
E-Micro Euro/USD M6E CME $341 $150
E-Micro USD/JPY M6J CME ¥16500 $150
Micro Swiss Franc M6S CME CHF. 363 $150

 

Corn ZC CME $2700 $500
Hard Red Winter Wheat KE KCBT $3,125 $950
Mini Corn YC CME $405 $135
Mini Soybeans YB CME $918 $250
Mini Wheat YW CME $310 $250
Oats ZO CME $1350 $500
Rough Rice ZR CME $1350 $900
Soybean Oil ZL CME $1688 $425
Soybeans ZS CME $4590 $500
Soymeal ZM CME $2700 $746
Wheat ZW CME $3240 $500