When comparing Namecheap vs Keybase, the Slant community recommends Namecheap for most people. In the question“What are the best website hosting providers?” Namecheap is ranked 13th while Keybase is ranked 21st. The most important reason people chose Namecheap is:
Domain registration at Namecheap is economical, as their name implies.
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Pros

Pro Low prices
Domain registration at Namecheap is economical, as their name implies.
Pro Great support with 24 hour live chat
Namecheap support is available 24 hours a day, every day of the year. Their support is provided over live text chat, which has a lower barrier to entry, faster connection, and allows you to communicate easier than other the phone.
Because most of the support you need for domains require you to provide text configuration data, live online messaging is the most efficient way to get fast support. It also does not require your constant attention so you don't have to waste time while the operator is researching an answer for you.
Pro Free subdomains
Namecheap allows you to set up 198 subdomains for free, and also provides wildcard subdomain catching so you can manage them yourself.
Pro Free e-mail and URL forwarding
Namecheap allows you to set up 100 virtual email addresses per domain, as well as catch all forwarding all undefined addresses.
Pro Supports credit cards, PayPal and adding funds to your account separately
When it comes to paying for domains, Namecheap supports all common payment methods. For most people this will be credit cards and Paypal, but Namecheap also has an option to add funds to your account separately.
Pro Free dynamic DNS routing
Pro Strong Anti-SOPA stance
Namecheap took a stand against SOPA.
Pro FreeDNS for outside domain
Namecheap offers a free and premium (w/ SLA) DNS hosting service for domains registered with other registrars.
Pro Free WHOIS privacy protection
It's active for one year.
Pro Bitcoin payment support
Pro Expiration grace period
Namecheap will notify you if your credit card is going to expire, and has a 27 day non-guaranteed grace period for renewal.
Pro Two-factor authentication
Pro Proactive support
Not all registrar care, but when there's an error or something held up the registration they've always at least gave it a shot without prompting. This is done in a proactive way, which isn't seen very often at all. This way the user can be hands off and not need to deal with certain issues as it is taken care of in the background by their support. User is still informed, of course, but can be entirely hands off, or not, but usually they've been efficient and transparent.
Pro Free .me domain for students
Through its NC.ME program, students can get a free 1-year registration on the .me TLD and discounts on .com, .io, and other TLDs along with Namecheap Private Email hosting.
Pro E2E encrypted
Completely end-to-end encrypted.
Pro Identity verification
Users can publish proofs of identity (PGP public key, Twitter, Facebook, etc).
Pro FOSS
Free (as in beer) and Open Source Software.
Pro Encrypted file sharing
Securely share files.
Pro Public encrypted filesystem
For sharing files publicly.
Pro 250GB of free team file storage
250GB of free storage for encrypted files in a team.
Pro Public teams
Teams can be public with open access or admin-approved access. Opt-in to list public teams.
Pro Private teams
Teams can be completely private (access granted via admin-approval only, not publicly listed).
Pro Encrypted Git
Encrypted private or team Git repositories with automatic commit signatures.
Pro Blockchain technology
Based on blockchain technology.
Pro Sigchain verification
View/verify the cryptographic signature history of any user.
Pro PGP/GPG support
Encrypt/decrypt any PGP message or file with minimal effort.
Pro Public key encryption
Supports public key encryption.
Pro Private encrypted filesystem
Securely store personal files that only you can access.
Pro Shared private encrypted filesystem
Share files securely and privately with other users, a group of users, or a team.
Pro 250GB of free private file storage
250GB of free storage for privately-encrypted files.
Pro Free static site hosting
Host a public static website for free. Sites are automatically viewable via keybase.pub if an index.html or index.md exist in your public files.
Pro Emoji reactions to limit excessive posts and notifications
Pro E2E encrypted team chat
Teams are E2E encrypted, unlike Slack and other services.
Cons
Con Misleading pricing
For example .me domain registration costs 3$ a year, but a continuation for 2 years cost 30$!
Con Expensive
It costs a lot of money to renew and purchase a domain. It also costs for their premium dns. They used to be cheap, but now it's so expensive.
