Mantle8
European natural hydrogen exploration company developing geoscience-based technologies for subsurface resource identification.
Agent readinessAbove median Open the scores section.Agent Readiness: 44/100. Above median. Measured by StartupHub.ai. Median 41.75/100Trust scoreAbove median Open the scores section.Data Trust: 76/100. Above median. Measured by StartupHub.ai. Median 61.About
Mantle8 is a European natural hydrogen exploration company founded in 2024. The company develops geoscience-based technologies to identify potential natural hydrogen resources and analyze hydrogen-generating systems in the subsurface. They aim to translate scientific research into scalable industrial technologies for future hydrogen production.
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Key facts
- Website
- mantle8.com
- Headquarters
- Grenoble, Auvergne-Rhône-Alpes, France
- Founded
- 2024
- Total funding
- $37M (Series A)
- Business model
- B2B
Funding rounds
- $31M1 May 2026
Led by Sandwater
- $2M10 Mar 2026
- $4M3 Mar 2025
| Date | Round | Amount | Post-money | Lead investors |
|---|---|---|---|---|
| 1 May 2026 | Series A | $31M | $44M | Sandwater |
| 10 Mar 2026 | Grant | $2M | ||
| 3 Mar 2025 | Seed | $4M | Breakthrough Energy Ventures Europe (BEV-E) |
Tech stack
Detected on mantle8.com, last scanned 29 Oct 2026. Run your own scan
- Frontend
- jQuery
- SEO
- Rank Math
- CMS / Builders
- WordPress
- CDN
- Cloudflare
- Email provider
- Microsoft 365
Measured, not editorial
Ahrefs DR
Measured by Ahrefs
Strength of the site’s backlink profile, on Ahrefs’ 0-100 Domain Rating scale. Licensed third-party data, not our opinion.22/100
Below median
Agent Readiness
Measured by StartupHub.ai
How well an AI agent can read and use this site: structured data, clean markup, and whether key facts are reachable without running JavaScript. We scan the live site.44/100
Above median
Site Speed
Measured by Google PageSpeed
Google PageSpeed mobile performance for the company’s own site. Measured by Google, not by us.75/100
Above median
Data Trust
Measured by StartupHub.ai
Whether this company is a safe place to put your data: security posture, privacy signals, and reputation evidence we could verify.76/100
Above median · 1,337 scored
API & MCP Security
Measured by StartupHub.ai
What this company’s API or MCP server gives an anonymous stranger: transport, whether anything answers without credentials, CORS, response headers and, when an MCP server replies, which of its tools can be called with no key. Scanned live, on request, because a security verdict months old is worse than none.Test your Ahrefs DR
The backlink strength of a domain, on the Ahrefs 0 to 100 scale. About a minute.
Frequently asked
What does Mantle8 do?
Mantle8 currently holds several exploration permits for potential natural hydrogen reservoirs.
Is Mantle8 trustworthy and reputable?
StartupHub's Data Trust & Reputation score for Mantle8 is 76 out of 100, a generally safe rating, based on site security posture, privacy practices, malware and phishing checks, and public reputation signals.
How much funding has Mantle8 raised?
Mantle8 has raised a total of $37M in funding. The most recent round on record is Series A.
SEC filings, insider activity, nonprofit links and pay benchmarks for Mantle8:
Company details: from public sources. Funding: no announced round on file. Ownership: not yet claimed by the company. Scores: measured by named tools; each links to its method. Our rules
