Taking the last week of Paypal sales:

Key price recently accepted at 61.66-61.77 (61.72) refined: https://backpack.tf/suggestion/60cadea70f687359ec42a325

https://forums.backpack.tf/topic/78361-%F0%9F%90%B6-buying-keys-competitive-pricing-backpacks-tod-via-cahapp-200-rep/

https://backpack.tf/trust/76561198068732040

Buying keys for $1.60 - 793 keys in the last week

$1.60 / 61.72 refined = $0.026

https://forums.backpack.tf/topic/68510-buying-keys-for-163-backpacks-via-paypal-380-rep/

https://backpack.tf/trust/76561198032176942

Buying keys for $1.63 - 961 keys in the last week

$1.63 / 61.72 refined = $0.026

https://forums.backpack.tf/topic/77688-selling-250-keys-for-171-venmo-172-paypal/

https://backpack.tf/trust/76561198061489334

Selling keys for $1.72 - 120 keys in the last week

$1.72 / 61.72 refined = $0.028

https://forums.backpack.tf/topic/78384-buying-keys-for-165usd-paypal/

https://backpack.tf/trust/76561198140719727

Buying keys for $1.65 - 1400 keys in the last week

$1.65 / 61.72 refined = $0.026

https://forums.backpack.tf/topic/38397-%F0%9F%94%A5frost-is-buying-keys-for-156-usd-paypal-500-trust-ratings%E2%9C%85-no-rep-needed/

https://backpack.tf/trust/76561198061836787

Buying keys for $1.56 - 343 keys in the last week

$1.56 / 61.72 refined = $0.025

A lot more evidence at $1.70ish values is available in the 2 week time span.

https://backpack.tf/trust/76561198064658655?mode=from&filter=1

I sold 900 keys for $1.70

Bought 782 keys for $1.70-1.72

Also not noted in my trust I bought 500 keys from aj for $1.70

Every value from $1.56 to $1.72 is 2.5 cents, which would round up to 3 cents.

Keys are currently abundant through Paypal anywhere from $1.60 to $1.70.

Going with 3 cents flat, unless we could make 3 decimal places, where a range like $0.025-$0.028 could be considered.

More:

https://forums.backpack.tf/topic/78402-willing-to-beat-other-buyers-buying-mann-co-supply-crate-keys-for-166-and-tour-of-duty-tickets-for-078-via-paypal/

https://backpack.tf/trust/76561198050194207

Bought 980 keys for $1.66

https://forums.backpack.tf/topic/75270-selling-keys-for-175-paypalvenmozellepayoneercashapp-trusted-seller-2000-stock/

https://backpack.tf/trust/76561198109375402

Selling for $1.75, sold 820 and bought 500 more

https://forums.backpack.tf/topic/78421-buying-keys-160-zelle-or-paypal/

https://backpack.tf/trust/76561197991733793

Bought 200 keys for $1.60

https://forums.backpack.tf/topic/78372-selling-430-keys-170-each-via-cashapp/

https://backpack.tf/trust/76561198112011757

Sold 731 keys for $1.70 Cashapp

https://forums.backpack.tf/topic/78394-buying-keys-165-usd-tour-tickets-078-usd-and-more-for-paypal/

https://backpack.tf/trust/76561198069239963

Bought 140 keys for $1.65

https://forums.backpack.tf/topic/77090-buying-up-to-1200-keys-166-with-paypal/

https://backpack.tf/trust/76561198065283212

Bought 1300 keys for $1.65-1.66

https://forums.backpack.tf/topic/76949-selling-keys-for-zelle-crypto-venmo-cash-app-for-170-100%E2%80%99s-to-1000%E2%80%99s-in-stock-40000-keys-in-recent-rep-no-paypal/

https://backpack.tf/trust/76561198120347528

I see 6286 keys for $1.70 through not Paypal though

$1.65 / 61.72 refined = $0.026

$1.75 / 61.72 refined = $0.028

Still 3 cents

More:

https://forums.backpack.tf/topic/78440-willing-to-beat-other-sellers-selling-mann-co-supply-crate-keys-for-169-via-paypal-only/

https://backpack.tf/trust/76561198050194207

Selling keys for $1.69, sold 780 in the past 24 hours https://gyazo.com/9d238382dccea8e2629ecd8e6402596f

https://gyazo.com/aa9c9ef30612ce228f12cdeaf12f2cd7

https://imgur.com/a/5FIEgIw

Bought 400 keys for $1.62

https://forums.backpack.tf/topic/78449-selling-1k-keys-165-ea-paypal/

https://backpack.tf/trust/76561198170365551

Selling keys for $1.65, sold 842

https://gyazo.com/e7f83c4ccbe5026046f4b613593475ea

Right now, looks like keys are around 62 refined, which doesn't make a difference

$1.60 / 62 = $0.025

$1.80 / 62 = $0.028

More:

https://gyazo.com/d1201b2476b625d4f48d23f468d3c2fc

Keys currently at 59.88-60.00 refined

https://forums.backpack.tf/topic/78523-offline-buying-tf2-keys-for-paypal-164/

https://backpack.tf/trust/76561198064658655

1100 keys for $1.64

https://forums.backpack.tf/topic/77708-buying-backpacks-for-cash-and-keys-160-paypal-venmo-cashapp-zelle/

https://backpack.tf/trust/76561198061489334

3700 keys for $1.60

https://forums.backpack.tf/topic/78440-currently-not-buying-willing-to-beat-other-sellers-and-discounts-selling-mann-co-supply-crate-keys-for-169-via-paypal-only/

https://backpack.tf/trust/76561198050194207

2700 keys for $1.69

https://forums.backpack.tf/topic/78361-%F0%9F%90%B6-buying-keys-164-competitive-pricing-backpacks-tod-via-cahapp-200-rep/

https://backpack.tf/trust/76561198068732040

280 keys for $1.64

https://forums.backpack.tf/topic/78479-buying-keys-at-165133%E2%82%AC-usd-paypal-i-pay-fees/

https://backpack.tf/trust/76561198991874988

450 keys for $1.65

https://forums.backpack.tf/topic/75270-selling-keys-for-170-paypalvenmozellepayoneercashapp-trusted-seller-2000-stock/

https://backpack.tf/trust/76561198109375402

5100 keys for $1.70

https://forums.backpack.tf/topic/78131-wtb-tf2-keys-and-backpacks-163-each-paypal-i-cover-all-fees-195-rep-%E2%9C%94%EF%B8%8F/

https://backpack.tf/trust/76561198060299122

1500 keys for $1.63

https://forums.backpack.tf/topic/76896-blazexth3rm4lx-is-buying-keys-for-160-usd-paypal/

https://backpack.tf/trust/76561198061108999

1700 keys for $1.60

https://forums.backpack.tf/topic/77764-selling-keys-~-174%F0%9F%92%B2-buying-keys-~-add-me-to-talk-paypalnegotiable60trust-buying-backpacks-for/?tab=comments#comment-651610

https://backpack.tf/trust/76561198086948995

800 keys for $1.74

$1.60 / 60 = $0.026, rounds to 3 cents

$1.74 / 60 = $0.029, rounds to 3 cents