Hardware-rooted transaction-assurance platform using SIM/eSIM cryptographic approval to protect high-risk digital actions, including AI-era identity and impersonation threats.
SLC Guardian is enterprise transaction-assurance infrastructure designed to verify high-risk digital actions before they execute. Instead of treating a successful login as continuing proof of authorization, Guardian sends an action-specific cryptographic challenge to the SIM or eSIM secure element, receives a signed proof and verifies that proof before approving the action.1
The current product surface includes an assurance engine, policy controls, APIs, audit/telemetry functions and a management portal. SLC documents REST APIs, iOS and Android SDKs, webhooks, and integration with identity providers, fraud systems and approval workflows.1 The company also states coverage across more than 600 mobile networks in 180+ countries; that scale figure is a vendor claim rather than an independently audited measurement.2
SLC does not publish Guardian prices. Access is enterprise and sales-led through demo/contact flows. The company's current terms say the public site does not provide consumer accounts or transaction functionality and that commercial use of SLC services is governed by a separate written agreement.3
That model is normal for security infrastructure requiring integration and contractual controls, but it prevents an evidence-based public comparison of cost or value against competing authentication and transaction-assurance products.
The product architecture and integration surface are documented in useful detail by SLC.1 The August 2026 privacy policy states that SLC acts as a processor for business customers and may process subscriber, SIM/eSIM and device identifiers, network/session data, IP addresses and location data. It also states that its security program uses encryption in transit and at rest, continuous monitoring/logging, a secure development lifecycle, penetration testing and vulnerability scanning.4 These are current vendor disclosures, not an independent security audit.
Independent trade coverage is still limited. Biometric Update reported the CertiPath partnership and described the Guardian-style cryptographic challenge to SIM/eSIM secure hardware, while Digital IT News reported the Guardian launch and its hardware-rooted authorization design.56 Those reports corroborate product existence and positioning but do not establish real-world fraud reduction, latency, uptime or resistance to sophisticated attacks. No hands-on test was performed for this review.
Guardian is most relevant to banks, payments companies, government systems, workforce-security teams and other regulated organizations that need stronger proof for wire transfers, beneficiary changes, privileged operations, document approvals or sensitive AI-agent actions.1
It is not a consumer security app. Adoption requires enterprise integration and a workflow in which users have compatible mobile connectivity and SIM/eSIM-backed credentials.
action-specific rather than session-level authorization; hardware-rooted cryptographic signing; explicit support for enterprise APIs, SDKs and webhooks; auditability; integration with existing identity and fraud infrastructure; a current privacy notice that describes both processed data categories and stated security controls.14
no public pricing; limited independent exact-product testing; no eligible external numeric reliability or user-experience corpus; effectiveness and network-scale claims remain primarily vendor-sourced; deployment depends on telecom/SIM-eSIM infrastructure; the service may process sensitive subscriber, device, network and location information that enterprise customers must govern appropriately.4
Products matched by shared tasks, audience, workflow, product type and capabilities.