Skip to main content

Security report for tenderly.co

Tenderly · Technology · Iceland

Low risk. 3 critical or high findings in Security headers and SSL/TLS.

Security score

77/100

Risk levelLow

0–100, higher is better. How it is calculated

Tenderly is a technology company specializing in full-stack Web3 infrastructure solutions designed to support the entire decentralized application lifecycle, from development to on-chain scaling. The platform offers a suite of developer tools including Virtual TestNets, customizable Node RPCs, transaction simulation, debugging, and monitoring services. Positioned as an industry-recognized provider, Tenderly partners with major blockchain projects such as Arbitrum, Optimism, and Chainlink, reinforcing its market presence in the Web3 ecosystem. The target audience primarily consists of Web3 professionals and developers seeking scalable and collaborative infrastructure solutions. Technically, the website leverages modern frameworks like Next.js and React, hosted on Google Cloud infrastructure, and integrates analytics and customer engagement tools such as Matomo, Google Tag Manager, and Intercom. The site demonstrates good performance, mobile optimization, and SEO practices. Security posture is solid with HTTPS enforcement, security headers, and domain transfer protections, though DNSSEC is not enabled. Privacy compliance is partial, with a cookie consent mechanism present but lacking explicit privacy policy and terms of service pages. Overall, Tenderly presents a professional and trustworthy digital presence aligned with its business objectives.

Scanned

NIS2 and GDPR posture

GDPR outside view
88/ 100 · Low
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

3 findings rated critical or high. Fix these first.

  1. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  2. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

Need hands-on remediation? Email guard@offseq.com

Keep watching tenderly.co

This scan found 19 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

Billed monthly to your card. Cancel anytime. The full timeline opens with your unlock code.

Full report

€39.90one-time

  • The complete analysis as a PDF you can cite
  • Email delivery with an unlock code
  • Lifetime access to this report

Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
72
Security headers
30
Email security
85
DNS health
85
Network security
100
GDPR outside view
88
Average
77

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Tenderly operates in the competitive Web3 infrastructure sector, offering essential tools that facilitate smart contract development, testing, and deployment. Its business model is platform-as-a-service, monetizing through access to its suite of developer tools and infrastructure services. The company has established strategic partnerships with leading blockchain projects, enhancing its credibility and reach. The absence of explicit contact information and privacy/legal policies on the main site suggests areas for improvement in transparency. The company is relatively young, founded in 2020, and appears to be a medium-sized enterprise based in Iceland. Its ecosystem includes integrations with numerous prominent Web3 platforms, indicating a strong collaborative approach and potential for growth. Tenderly's focus on developer experience and infrastructure scalability positions it well within the evolving blockchain technology market.

Security posture

Tenderly exhibits a mature security posture with mandatory HTTPS, comprehensive security headers, and domain transfer restrictions. The use of privacy protection for WHOIS data is justified given the nature of the business. However, the lack of DNSSEC implementation is a minor security gap that could be addressed to enhance DNS security. No vulnerabilities or exposed sensitive data were detected in the website content. The absence of a published security policy, incident response plan, or vulnerability disclosure program limits transparency in security governance. Cookie consent is implemented, indicating awareness of privacy regulations. Overall, the security measures are robust but could be improved by adding formal security documentation and enabling DNSSEC.

Recommendations

  1. Publish a comprehensive privacy policy and terms of service to improve legal compliance and user trust.
  2. Enable DNSSEC on the domain to strengthen DNS security.
  3. Add a dedicated security policy and incident response information to enhance transparency and preparedness.
  4. Implement a vulnerability disclosure program or security.txt file to encourage responsible reporting.
  5. Provide clear contact information including company emails and phone numbers to improve communication and credibility.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Tenderly
Description
Integrate a complete, full-stack Web3 infrastructure solution for the entire dapp lifecycle, from development to on-chain scaling.
Key services
Virtual TestNets, Node RPC, Developer Explorer, Transaction Simulator, Debugging Tools, Monitoring
Content quality
good
Branding
consistent

Technology

Stack
React, Next.js, Matomo Analytics, Google Tag Manager, Intercom
Frameworks
Next.js
Performance
fast
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Client transfer prohibited domain status
  • Use of privacy protection for WHOIS
  • No exposed sensitive data detected in HTML

Analytics and tracking

Services
Matomo, Google Tag Manager
Tracking level
moderate
Privacy practices
basic

Advertising

Tracking pixels
Matomo, Intercom
Marketing tools
Intercom
Transparency
basic

Site quality

Design
good
User experience
good
Content relevance
good
Navigation
good
Professionalism
good
Trustworthiness
high

Key observations

  1. Website is professionally designed and well structured.
  2. Strong focus on Web3 developer tools and infrastructure.
  3. Multiple partnerships with major blockchain projects.
  4. No visible contact emails or phone numbers on homepage.
  5. Privacy policy and terms of service pages not found in scanned content.
  6. Cookie consent mechanism is implemented.
  7. Use of modern web technologies and analytics tools.
  8. Domain uses privacy protection but is registered with a reputable registrar.
  9. No signs of malicious or suspicious content.
Technical notes

Notes

The website is built using modern web technologies including React and Next.js, ensuring a performant and responsive user experience. Hosting on Google Cloud inferred from DNS nameservers provides reliable infrastructure. Integration of analytics tools like Matomo and Google Tag Manager supports data-driven insights, while Intercom facilitates customer engagement. The site demonstrates good SEO and mobile optimization, with proper meta tags and structured navigation. No CMS was detected, indicating a custom or framework-based site. Performance is fast with preloading of key assets. Accessibility is basic but could be enhanced. The technical stack is well-suited for a technology platform targeting developers, with opportunities to improve security configurations and privacy compliance.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

Reviews of this site

Share your experience with tenderly.co. Every review is verified by email and published after moderation.

Overall rating
Select a rating
4000 characters remaining

We’ll email you to confirm your review and keep your details private.

Community rating

No published reviews yet. Be the first to review tenderly.co.

Feedback on this report

Rate this report, add an optional comment, and tell us if you want a security specialist to follow up.

Overall report quality
Select a rating
2000 characters remaining

We only use your feedback to improve Guard reports. Contact details are never shared.