You can read about setting up applications for displaying in trades here. To display trades of a single application, select it from the list:

Horzine Supply Crate | Series #13
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Killing Floor 2
Horzine Supply Crate | Series #13
Type: Accessory Supply Crate
Market price: ~0.03 USD
Requires a Series #13 Horzine Supply Crate Key to open.

Contains one rare or better of the following:
Insectoid Helmet Closed
Robo Scully
Insectoid Helmet Open
Insectoid Helmet Goggles Up
Demon Slayer Helmet
Insectoid Helmet Goggles Down
Minotaur Helmet
or an Exceedingly Rare Precious Accessory!
Emote Crate | Series #1
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Killing Floor 2
Emote Crate | Series #1
Type: Emote Crate
Market price: ~0.04 USD
Requires a Series #1 Emote Crate Key to open.

Contains one rare or better of the following:
Lets Get Crazy
Thunder Clap
Uncle Charlie
Wacky Wavy
Its Raining Dosh
Lion Uppercut
Mating Ritual
Kickin It
Fire Ball
Make It Rain
or an Exceedingly Rare Deluxe Emote!
Horzine Supply Crate | Series #14
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Killing Floor 2
Horzine Supply Crate | Series #14
Type: Accessory Supply Crate
Market price: ~0.03 USD
Requires a Series #14 Horzine Supply Crate Key to open.

Contains one rare or better of the following:
Firefighter Helmet
Firefighter Helmet Mask Down
Firefighter Helmet Mask Up
Firefighter Gasmask
Firefighter Helmet
Firefighter Helmet Mask Down
Firefighter Helmet Mask Up
Firefighter Gasmask
Firefighter Oxygen Tank
Firefighter Oxygen Tank
or an Exceedingly Rare Precious Accessory!
AR15 | Stories of War | Battle-Scarred
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Killing Floor 2
AR15 | Stories of War | Battle-Scarred
Type: Uncommon Weapon Skin
Market price: ~0.09 USD
Exterior: Battle-Scarred | This is for Zeds, not 'varmints'.
Horzine Supply Crate | Series #10
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Killing Floor 2
Horzine Supply Crate | Series #10
Type: Accessory Supply Crate
Market price: ~0.03 USD
Requires a Series #10 Horzine Supply Crate Key to open.

Contains one rare or better of the following:
Rebel Helmet
Rebel Mask
Rebel Neck Warmer
Rebel Helmet Goggles Down
Rebel Helmet Goggles Up
Steampunk Gas Mask Basic
Steampunk Gas Mask Open
Steampunk Gas Mask Closed
Steampunk Gas Mask Filtered
Steampunk Gas Mask Open Filtered
Steampunk Gas Mask Closed Filtered
or an Exceedingly Rare Precious Accessory!
Horzine Supply Crate | Series #11
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Killing Floor 2
Horzine Supply Crate | Series #11
Type: Accessory Supply Crate
Market price: ~0.03 USD
Requires a Series #11 Horzine Supply Crate Key to open.

Contains one rare or better of the following:
Reaper Face Armor
Reaper Dead Eyes
Reaper Dead Hood
Reaper Dead Mask
Reaper Jaw
Reaper Eyes
Reaper Hat
Reaper Raven Jaw
Reaper Raven Eyes
Reaper Raven Hat
or an Exceedingly Rare Precious Accessory!
Vietnam Encrypted USB
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Killing Floor 2
Vietnam Encrypted USB
Type: Encrypted Weapon Skin Blueprint
Market price: ~0.03 USD
Requires a Vietnam Blueprint Key to open.

Contains one of the following rare or better weapon skins:
Winchester 1894 | Vietnam
RPG-7 | Vietnam
M1911 | Vietnam
L85A2 | Vietnam
M4 | Vietnam
AK12 | Vietnam
M14EBR | Vietnam
M16 M203 | Vietnam
or an Exceedingly Rare Precious Skin!
L85A2 | Woodland | Battle-Scarred
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Killing Floor 2
L85A2 | Woodland | Battle-Scarred
Type: Common Weapon Skin
Market price: ~0.04 USD
Exterior: Battle-Scarred | The SA80 was the British Army's standard weapon, before the Army was, well, eaten.
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Headband | Dark Purple
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Killing Floor 2
Headband | Dark Purple
Type: Common Player Accessory
Market price: ~0.04 USD
Equipable from the gear menu; Compatible with DJ Scully, PC Rob Briar, Mr. Foster, Donovan Neal, Reverend Alberts, Lt. Bill Masterson, Hayato Tanaka, Ana Larive, Classic Briar, Classic Masterson, Anton Strasser, Tom Banner, Rae Higgins
Deepstrike Helmet | Olive
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Killing Floor 2
Deepstrike Helmet | Olive
Type: Rare Player Accessory
Market price: ~0.89 USD
Equipable from the gear menu; Compatible with Oisten Jägerhorn, DJ Scully, PC Rob Briar, Mr. Foster, Donovan Neal, Reverend Alberts, Lt. Bill Masterson, Hayato Tanaka, Ana Larive, Classic Briar, Classic Masterson, Anton Strasser, Tom Banner, Rae Higgins
Medic Encrypted USB
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Killing Floor 2
Medic Encrypted USB
Type: Encrypted Weapon Skin Blueprint
Market price: ~0.03 USD
Requires a Medic Blueprint Key to open.

Contains one of the following rare or better weapon skins:
HMTech-101 Pistol | Elite Unit
HMTech-201 SMG | Elite Unit
HMTech-301 Shotgun | Elite Unit
HMTech-401 Assault Rifle | Elite Unit
HMTech-001 Scapel | Elite Unit
HMTech Healer | Elite Unit
HMTech-101 Pistol | Elite Unit Green
HMTech-201 SMG | Elite Unit Green
HMTech-301 Shotgun | Elite Unit Red
HMTech-401 Assault Rifle | Elite Unit Red
or an Exceedingly Rare Precious Medic Skin!
Kevlar Helmet | Camo
Killing Floor 2
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Kevlar Helmet | Camo
Type: Rare Player Accessory
Market price: ~1.08 USD
Foster's Classic Suit
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Killing Floor 2
Foster's Classic Suit
Type: Player Uniform Variant
Kill zeds and look classy doing it! Compatible with Mr. Foster. Not tradeable or marketable.
Foster's Classic Tie
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Killing Floor 2
Foster's Classic Tie
Type: Player Accessory
Nice straight tie. Only compatible with Classic Foster Suit. Not tradeable or marketable.
Foster's Bow Tie
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Killing Floor 2
Foster's Bow Tie
Type: Player Accessory
Nice bow tie. Only compatible with Classic Foster Suit. Not tradeable or marketable.
Boomstick | Heat | Battle-Scarred
Killing Floor 2
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Boomstick | Heat | Battle-Scarred
Type: Master Crafted Weapon Skin
Market price: ~4.14 USD
Make It Rain Deluxe | Emote
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Killing Floor 2
Make It Rain Deluxe | Emote
Type: Deluxe Emote
Market price: ~7.77 USD
Make'n it rain, make'n it rain! Can be recycled into an exceptional cosmetic material.
RAF Goggles | Black Glow Blue
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Killing Floor 2
RAF Goggles | Black Glow Blue
Type: Rare Player Accessory
Market price: ~2.47 USD
Equipable from the gear menu; Compatible with Oisten Jägerhorn, DJ Scully, PC Rob Briar, Donovan Neal, Reverend Alberts, Lt. Bill Masterson, Hayato Tanaka, Ana Larive, Classic Briar, Classic Masterson, Anton Strasser, Tom Banner
Sideshow Human Canon | Horzine
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Killing Floor 2
Sideshow Human Canon | Horzine
Type: Summer Sideshow Player Accesosory
Market price: ~0.24 USD
Equipable from the gear menu; Compatible with most characters. This is an exclusive item from the "Summer Sideshow" seasonal event.
Sideshow Human Canon | Dummy
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Killing Floor 2
Sideshow Human Canon | Dummy
Type: Summer Sideshow Player Accesosory
Market price: ~0.28 USD
Equipable from the gear menu; Compatible with most characters. This is an exclusive item from the "Summer Sideshow" seasonal event.
Headband | Blue
Killing Floor 2
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Headband | Blue
Type: Uncommon Player Accessory
Market price: ~0.1 USD
Horzine Supply Crate | Series #10
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Killing Floor 2
Horzine Supply Crate | Series #10
Type: Accessory Supply Crate
Market price: ~0.03 USD
Requires a Series #10 Horzine Supply Crate Key to open.

Contains one rare or better of the following:
Rebel Helmet
Rebel Mask
Rebel Neck Warmer
Rebel Helmet Goggles Down
Rebel Helmet Goggles Up
Steampunk Gas Mask Basic
Steampunk Gas Mask Open
Steampunk Gas Mask Closed
Steampunk Gas Mask Filtered
Steampunk Gas Mask Open Filtered
Steampunk Gas Mask Closed Filtered
or an Exceedingly Rare Precious Accessory!
Wasteland Goggles | Red
Killing Floor 2
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Wasteland Goggles | Red
Type: Exceptional Player Accessory
Market price: ~2.96 USD
Steampunk Gas Mask Open | Black
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Killing Floor 2
Steampunk Gas Mask Open | Black
Type: Master Crafted Player Accessory
Market price: ~9 USD
Equipable from the gear menu; Compatible with DJ Scully, PC Rob Briar, Donovan Neal, Reverend Alberts, Lt. Bill Masterson, Hayato Tanaka, Ana Larive, Classic Briar, Classic Masterson, Anton Strasser, Tom Banner, Rae Higgins
Cyberbone USB Key
Killing Floor 2
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Cyberbone USB Key
Type: Weapon Skin Blueprint Decryption Key
Market price: ~3.41 USD
Deepstrike USB Key
Killing Floor 2
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Deepstrike USB Key
Type: Weapon Skin Blueprint Decryption Key
Market price: ~4.44 USD
High Voltage USB Key
Killing Floor 2
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High Voltage USB Key
Type: Weapon Skin Blueprint Decryption Key
Market price: ~3.12 USD
Horzine First Encounter USB Key
Killing Floor 2
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Horzine First Encounter USB Key
Type: Weapon Skin Blueprint Decryption Key
Market price: ~3.33 USD
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Scar | Woodland | Battle-Scarred
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Killing Floor 2
Scar | Woodland | Battle-Scarred
Type: Common Weapon Skin
Market price: ~0.04 USD
Exterior: Battle-Scarred | Designed originally for the US Special Operations Command, it is, indeed, special!
Boonie Cap | Default
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Killing Floor 2
Boonie Cap | Default
Type: Uncommon Player Accessory
Market price: ~0.11 USD
Equipable from the gear menu; Compatible with Oisten Jägerhorn, DJ Scully, PC Rob Briar, Mr. Foster, Donovan Neal, Reverend Alberts, Lt. Bill Masterson, Hayato Tanaka, Ana Larive, Classic Briar, Classic Masterson, Anton Strasser, Tom Banner, Rae Higgins
Scar | Woodland | Battle-Scarred
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Killing Floor 2
Scar | Woodland | Battle-Scarred
Type: Common Weapon Skin
Market price: ~0.04 USD
Exterior: Battle-Scarred | Designed originally for the US Special Operations Command, it is, indeed, special!
RPG-7 | Tiger | Mint
Killing Floor 2
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RPG-7 | Tiger | Mint
Type: Uncommon Weapon Skin
Market price: ~0.26 USD
Scar | Woodland | Battle-Scarred
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Killing Floor 2
Scar | Woodland | Battle-Scarred
Type: Common Weapon Skin
Market price: ~0.04 USD
Exterior: Battle-Scarred | Designed originally for the US Special Operations Command, it is, indeed, special!
Common Weapon Skin Material
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Killing Floor 2
Common Weapon Skin Material
Type: Crafting Material
Common crafting material that when combined, can be used to make uncommon weapon skins.
Common Weapon Skin Material
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Killing Floor 2
Common Weapon Skin Material
Type: Crafting Material
Common crafting material that when combined, can be used to make uncommon weapon skins.
Desert Eagle | Horzine Elite Red | Battle-Scarred
Killing Floor 2
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9MM | Horzine Elite Red | Mint
Killing Floor 2
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9MM | Horzine Elite Red | Mint
Type: Master Crafted Weapon Skin
RPG-7 | Precious
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Killing Floor 2
RPG-7 | Precious
Type: Exceedingly Rare Weapon Skin
Market price: ~166.75 USD
Exterior: Precious | Only arms itself a few meters down-range, so you don't blow your own face off. And watch the back-blast!
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