Editorial policy
Our guides help collectors identify coins and understand what affects their value. This page explains how we write them, where the facts come from and how we fix mistakes.
Who writes the guides
Guides are published under the byline "Keepmint Team". They are written and reviewed by the Keepmint team, led by the founder, who is a coin collector. Software tools may help us draft and check text, but every fact in a guide is checked against the sources listed at its end before it is published.
Sources
We rely on primary and standard references, and we cite them at the end of each guide:
- United States Mint publications and mintage data for US coins;
- standard catalogs, such as A Guide Book of United States Coins (the "Red Book");
- public reference pages from the grading services PCGS and NGC;
- Wikipedia mintage tables, only as a cross-check and never as the only source.
We never invent mintages, dates or varieties. If we cannot confirm a fact, we leave it out.
Values and prices
Coin prices change and depend heavily on condition, so our guides explain what affects value (metal, rarity, condition and demand) instead of publishing price tables we cannot keep current. Values shown in the Keepmint app are estimates, not appraisals.
Review and updates
Every guide shows a "Last reviewed" date. We review guides when sources publish new data and when readers report problems.
Corrections
If you find an error, write to contato@webk.com.br with the page address and, if you can, a source. We check every report. When we confirm an error, we fix it and update the "Last reviewed" date.
Images
- We prefer our own photos of coins from the founder's collection.
- When we use images from the United States Mint, we follow its image use policy and credit them as "United States Mint image." Their use does not imply any endorsement by the United States Mint.
- We do not use images of other countries' coins unless they are our own photos or properly licensed.
How we test coin apps
Keepmint is our app, and we say so in every comparison. When we compare coin identifier apps, we install each app, run the same set of coins from our collection through all of them, and record the results. We publish a comparison only after these tests are done, and we report what we observed, including where other apps did better.
Independence
We do not accept payment to include or rank coins, dealers or apps in our guides.