Guardrail
A runtime blockchain security engine that protected $30B+ in assets, acquired in-house by stablecoin platform Rain.
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Guardrail, based in San Francisco, is a runtime blockchain security engine that keeps watching transactions after deployment, catching risky on-chain activity that pre-deployment smart-contract audits cannot. It has monitored transactions across more than 30 chains and protected over $30 billion in assets.
The fintech and stablecoin platform Rain acquired it in-house to extend real-time transaction protection into its own products.
Innovation Matrix Assessment
Expanded from a general transaction-monitoring engine to a purpose-built stablecoin security model across 30+ chains.
Actively protecting a reported $30 billion in assets in production across multiple blockchains prior to the acquisition.
Acquired by Rain in June 2026 to build real-time transaction protection directly into Rain's stablecoin products.
Continuous post-deployment runtime monitoring differentiates Guardrail from the pre-deployment audit model most blockchain security firms rely on.
The $30B-protected claim is self-reported without independent third-party verification found in coverage.
Real-time on-chain transaction security is increasingly critical as stablecoin volumes and blockchain-based payments scale.
Why CISOs Should Care
Guardrail gives blockchain and stablecoin platforms a runtime security layer that keeps watching transactions after deployment, catching risky on-chain activity that pre-deployment smart-contract audits alone cannot.
What Makes It Different
Guardrail is a proactive, programmable security engine that has monitored transactions across 30+ chains and protected over $30 billion in assets, defending protocols continuously at runtime rather than only auditing code before launch.
The Matrix Verdict
52/100 — INCREMENTAL INNOVATOR
A runtime blockchain security engine with a large real-money protection track record, acquired in-house by fintech/stablecoin platform Rain to extend real-time transaction protection directly into Rain's own products.
Editorial Note: Claims vs. Verified Findings
The '$30 billion in assets protected across 30+ chains' figure is company-stated on Guardrail's own site and in the Rain acquisition announcement; no independent third-party audit of this figure was found.
Sources
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