Robert Matthews Coin Authentication
- Specialises in the scientific examination and authentication of British milled coins.
- http://www.coinauthentication.co.uk/

PCI
- Accepts direct submittals from the general public, collectors and dealers.
- http://www.pcicoins.com/

Trugrade Service
- Certification and encapsulation of U.S. coins 1792 to present and foreign coins 1600 to present. Downloadable online submission forms.
- http://www.trugradeservice.com

Sovereign Entities Grading Service, Inc.
- Grading and encapsulating service for U.S. coins, errors, and varieties.
- http://www.segsgrading.com/

Coin Grading Australia
- A third party grading service with a variety of services and fees. Grade US, Commonwealth and Australian coins.
- http://coingradingaustralia.iinet.net.au/

Professional Coin Grading Service
- Includes prices and descriptions of grading and authentication services.
- http://pcgs.com/index.chtml

Numistrust
- A fully insured, comprehensive grading and encapsulation service. Coins do not have to be submitted through a dealer.
- http://www.numistrust.com/

Numismatic Guaranty Corporation of America
- Submit most US and world coins for grading through an authorized member/dealer.
- http://www.ngccoin.com/

Independent Coin Grading Company
- Offering blind submission through a CPA firm to eliminate submission bias.
- http://www.icgcoin.com/

ASA Accugrade, Inc.
- Devoted to the education and protection of the consumer since 1984.
- http://www.asa-accugrade.com/coins.htm

Ancient Coin Certification Service
- David R. Sear provides an authoritative aid to collectors and dealers who are seeking both a valid attribution of their coins and confirmation of authenticity.
- http://www.davidrsear.com/certification.html

ANACS
- A service that renders an opinion on a coin's authenticity and grade.
- http://www.anacs.com/