iOS · Quizlet Inc

Quizlet: More than Flashcards

Developer URL: https://quizlet.com/
app-ads.txt: https://quizlet.com/app-ads.txt · 200
Checked: Oct 7, 2026

88/100

180 lines · 138 verified against sellers.json

Findings

Each finding lists the exact lines involved. Findings are automated observations of public files as of Oct 7, 2026. They describe file contents, not the intent or conduct of any company.

warning

Seller IDs not listed in the ad system's sellers.json

10 −6 pts

The ad system's current sellers.json doesn't list these accounts, so buyers that validate the chain can't match them. Common causes are closed accounts or former partners.

How to fixAsk each partner whether the account is still active and request their current lines; remove lines for closed accounts.

Evidence (10)

line 9      pubmatic.com,157661-A,DIRECT,5d62403b186f2ace
             → sellers_json: https://pubmatic.com/sellers.json
line 11     triplelift.com,6633,DIRECT,6c33edb13117fd86
             → sellers_json: https://triplelift.com/sellers.json
line 26     Conversantmedia.com,40886,RESELLER
             → sellers_json: https://conversantmedia.com/sellers.json
line 38     video.unrulymedia.com,2564526802,RESELLER
             → sellers_json: https://video.unrulymedia.com/sellers.json
line 85     adelement.com, 48268, reseller
             → sellers_json: https://adelement.com/sellers.json
line 130    smartadserver.com, 4012, reseller
             → sellers_json: https://smartadserver.com/sellers.json
line 135    smilewanted.com, 4391, reseller
             → sellers_json: https://smilewanted.com/sellers.json
line 168    risecodes.com,63832beef8189a00015cb6d3,RESELLER
             → sellers_json: https://risecodes.com/sellers.json
line 169    risecodes.com,6486c6155b231000010244b0,RESELLER
             → sellers_json: https://risecodes.com/sellers.json
line 206    thunder-monetize.com, 9630185716, RESELLER
             → sellers_json: https://thunder-monetize.com/sellers.json

warning

DIRECT lines inconsistent with public data

4 −4 pts

The ads.txt specification defines DIRECT as an account the publisher directly controls. For these lines, either the ad system's own sellers.json lists the account as INTERMEDIARY, or the same account is marked DIRECT in the files of 3 or more unrelated companies. Either way, the public data does not support the DIRECT label. Buyers that use DIRECT labels in supply-path decisions may treat these lines differently.

How to fixUse DIRECT only for accounts your company controls. Confirm with each partner whether the account is yours; if it isn't, the specification calls for RESELLER.

Evidence (4)

line 61     rubiconproject.com,24196,DIRECT,0bfd66d529a55807
             → observed: sellers.json lists the account as INTERMEDIARY  name in sellers.json: Google  domain in sellers.json: google.com
line 78     Media.net,8CUS8FQ37,DIRECT
             → observed: sellers.json lists the account as INTERMEDIARY  name in sellers.json: Quizlet Inc (via OB)  domain in sellers.json: google.com
line 138    themediagrid.com, a7ojmu, direct, 9fac4a4a87c2a44f
             → observed: sellers.json lists the account as INTERMEDIARY; the same account is marked DIRECT by 36 different companies  name in sellers.json: Nimbus Advertising Solutions  domain in sellers.json: adsbynimbus.com
line 160    pubmatic.com,157286,DIRECT,5d62403b186f2ace
             → observed: sellers.json lists the account as INTERMEDIARY  name in sellers.json: Quizlet (via EB)  domain in sellers.json: google.com

warning

Lines for ad system domains that don't resolve

2 −1 pts

These ad system domains don't resolve (the domain may be retired, merged or misspelled). The lines can't be validated, and if the domain is registered again, its new holder would appear authorized.

How to fixRemove these lines. If the domain is registered again, its new holder would appear authorized by your file.

Evidence (2)

line 10     districtm.io,101226,DIRECT,3fd707be9c4527c3
             → ad_system: districtm.io
line 25     districtm.io,101226,DIRECT,3fd707be9c4527c3
             → ad_system: districtm.io

info

Duplicate lines

7 −1 pts

Harmless but a sign of copy-paste maintenance.

How to fixRemove duplicates; keep one copy of each line.

Evidence (7)

ad_system: appnexus.com  seller_id: 10240  relationship: DIRECT
ad_system: appnexus.com  seller_id: 1908  relationship: RESELLER
ad_system: districtm.io  seller_id: 101226  relationship: DIRECT
ad_system: yahoo.com  seller_id: 57094  relationship: DIRECT
ad_system: indexexchange.com  seller_id: 193403  relationship: DIRECT
ad_system: sonobi.com  seller_id: bfbb84dcf2  relationship: DIRECT
ad_system: media.net  seller_id: 8cuhurk53  relationship: DIRECT

info

Ad systems without a public sellers.json

The ad system doesn't publish a readable sellers.json, so nobody can verify these lines. That's the ad system's gap, not the app's, so no points are deducted.

How to fixAsk the partner to publish sellers.json; until then buyers can't verify that path.

Evidence (23)

line 6      appnexus.com,10240,DIRECT,f5ab79cb980f11d1
             → sellers_json: HTTP 403
line 7      appnexus.com,1908,RESELLER,f5ab79cb980f11d1
             → sellers_json: HTTP 403
line 8      openx.com,540709731,DIRECT,6a698e2ec38604c6
             → sellers_json: HTTP 403
line 20     appnexus.com,10240,DIRECT
             → sellers_json: HTTP 403
line 21     appnexus.com,1908,RESELLER,f5ab79cb980f11d1
             → sellers_json: HTTP 403
line 35     openx.com,537149888,RESELLER,6a698e2ec38604c6
             → sellers_json: HTTP 403
line 36     appnexus.com,3703,RESELLER,f5ab79cb980f11d1
             → sellers_json: HTTP 403
line 67     openx.com,537100188,RESELLER,6a698e2ec38604c6
             → sellers_json: HTTP 403
line 89     appnexus.com, 12061, reseller, f5ab79cb980f11d1
             → sellers_json: HTTP 403
line 90     appnexus.com, 12616, reseller, f5ab79cb980f11d1
             → sellers_json: HTTP 403
line 91     appnexus.com, 12976, reseller, f5ab79cb980f11d1
             → sellers_json: HTTP 403
line 92     appnexus.com, 8173, reseller, f5ab79cb980f11d1
             → sellers_json: HTTP 403
line 103    eskimi.com, 2020000807, reseller
             → sellers_json: HTTP 403
line 104    freewheel.tv, 1601349, reseller
             → sellers_json: HTTP 403
line 105    freewheel.tv, 1601610, reseller
             → sellers_json: HTTP 403
line 112    openx.com, 540274407, reseller, 6a698e2ec38604c6
             → sellers_json: HTTP 403
line 137    startapp.com, 143265457, reseller
             → sellers_json: HTTP 404
line 151    openx.com, 565070028, DIRECT, 6a698e2ec38604c6
             → sellers_json: HTTP 403
line 155    openx.com,540233820,RESELLER,6a698e2ec38604c6
             → sellers_json: HTTP 403
line 156    openx.com,540936405,DIRECT,6a698e2ec38604c6
             → sellers_json: HTTP 403
line 193    openx.com, 538959099, RESELLER, 6a698e2ec38604c6
             → sellers_json: HTTP 403
line 196    appnexus.com, 1019, RESELLER, f5ab79cb980f11d1
             → sellers_json: HTTP 403
line 219    loopme.com,11227,RESELLER,6c8d5f95897a5a3b
             → sellers_json: HTTP 403

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