SOLUTION / 002Sales → ComparisonCOLLECTION ACTIVE AS OF 14·09·2026SINCE MAY 2025
Useful data doesn't arrive ready.
Trading card sales and grading population reports, scattered across six sources. Finding a sale is easy. Knowing exactly what sold is the work.
BUSINESS VIEW
- 01The day-to-day
Find completed sales source by source, identify the exact card, set aside duplicates, put a price next to a rarity.
- 02The problem
You find a sale. You still have to identify it: edition, printing, language.
- 03The solution
Gathers the evidence, identifies the exact card, sets the noise aside, then compares.
- 04Not your job anymore
The collecting, the identifying, the deduplicating.
- 05The person keeps
Collecting PSA and ARS population reports by hand; quarantining a listing.
SYSTEM VIEW
- BEFORE01 · INPUT6 SOURCEScompleted sales, public; each in its own format
- SOLUTION02 · INTEGRATIONCOLLECT
- source
- url
- sold_date
- screenshot
- 03 · RULESCATALOGUE
- edition
- printing
- language
- 04 · RULESDUPLICATESa sale seen twice counts once; set aside, never deleted
- 05 · HUMANPOPULATION37 PSA archives · 14 ARS, collected by hand then imported
- AFTER06 · OUTPUTPRICE × POPULATIONmembers' site, bilingual
01What disappears
WORK
Find completed sales, source by source, each in its own format., crossed out
SOLUTION
Six sources of completed sales, 3,942 distinct listings collected from May 2025 to 14 September 2026, 3,364 listing screenshots kept as evidence.
RESULT
6 sources
WORK
Know exactly which card it is: edition, printing, language., crossed out
SOLUTION
Every listing is resolved against a catalogue of 14,445 cards and 43,949 printings. What cannot be resolved stays flagged.
RESULT
14,445 cards
WORK
Set aside duplicates and listings that say nothing., crossed out
SOLUTION
A sale seen by two sources counts once. A change to the relevance rules took the retained lines from 73 to 148; the rule only ever moves a line up, never down.
RESULT
73 → 148
relevant lines before and after a change to the rules
WORK
Put a price next to a rarity., crossed out
SOLUTION
37 monthly PSA archives and 14 ARS archives. Every sale is read against the graded population of its card.
RESULT
37 + 14
monthly population archives, PSA and ARS
02Data flow
From six sources to one comparison.
The value is not in a sale. It appears when the sale has one card, exactly one, and a population to read it against.
6
sources
3,942
distinct listings collected
14,445
cards in the catalogue · 43,949 printings
DUPLICATES
set aside
PRICE × POPULATION
37 PSA archives · 14 ARS archives
The reader queries data that is already identified and deduplicated, instead of rebuilding the context on every search.
03Human intervention
What the system does
- Collects.
- Completed sales from six sources, with the listing image as evidence.
- Resolves.
- Normalises, ties each listing to a card in the catalogue, deduplicates, keeps the history.
- Structures populations.
- PSA and ARS reports, archive after archive, queryable over time.
- Compares.
- Price × population, on a bilingual members' site: browsing, cross-referencing, quarantine, sharing, authentication, paywall.
What stays manual
- PSA and ARS population reports are collected by hand, locally; the imports are then processed overnight.
- Quarantine exists to set a listing aside without deleting it.
- RULES
- Finding a sale is easy.
- HUMAN
- Knowing exactly what sold is the work.
04What proves it
- 3,942
- distinct listings collected, May 2025 to 14 September 2026, across six sources
- 3,364
- listing screenshots kept as evidence, all present on disk
- 73 → 148
- retained lines after a change to the relevance rules, measured on the production database on 26 July 2026
- ≈ 100 · 25
- automated tests · database changes
05Data
- READS
- Public completed-sale listings, from six sources; PSA and ARS population reports.
- WRITES
- Its own database; the members' site.
- KEEPS
- The sales history, and a screenshot of every listing as evidence.
- ACCESS
- Authentication and a paywall on the members' site; share links.
06Where it actually stands
Sales collection active as of 14 September 2026, last run that day. The database, the members' site and the sales and population pipelines are in production. PSA and ARS reports are still collected by hand, locally, then imported. The system is not fully autonomous, and this page does not claim otherwise.
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