The credibility of an airdrop, which is a free distribution of cryptocurrency tokens or coins, can be assessed based on several factors:

1. **Reputation of the development team**: If the team has a good reputation in the cryptocurrency community, has completed similar projects before, and is transparent about its members, this can strengthen the credibility of the airdrop.

2. **Clear project objective**: A project with a clear objective, a detailed action plan and a realistic roadmap is often more credible.

3. **Active community**: An active and engaged community around the project can also be a sign of credibility. This can be verified through social networks, chat rooms and other communication platforms.

4. **Partnerships and support**: If the project has partnerships with reputable companies or is supported by known investors, this can strengthen its credibility.

5. **Transparency**: Transparency in operations, token distribution, finances, and other aspects of the project is crucial to building trust.

6. **Third-party verification**: Third-party security audits, reviews, and other forms of independent verification can also contribute to the credibility of an airdrop.