SecurityMetrics alternatives for protecting the payment page (2026)
By Laís Peixoto
Growth Marketer, Proteside
Published
Teams weighing alternatives to SecurityMetrics Shopping Cart Monitor find another external monitor (Reflectiz), agents on the page (Feroot, c/side), CDN and WAF modules (Cloudflare Client-Side Security, formerly Page Shield, and Akamai Client-Side Protection & Compliance) and Proteside's approach, which verifies the payment itself in every session. The decision starts with one question: is evidence enough, or does the attack have to be stopped while the shopper pays?
Why teams evaluate other options
The checkout takes more than cards
UPI, PromptPay, PayNow, Pix, bank slips and stablecoins have no card form to watch. The attack is a payee swap on screen, and a monitor that visits the page at intervals is looking at the page outside the session where it happens.
Detection and prevention are different jobs
SecurityMetrics describes its product as built for detection. Teams that need a script stopped, and not only reported, look for a tool that acts inside the shopper's browser.
The PCI assessment lives elsewhere
Shopping Cart Monitor fits the SecurityMetrics portal. Merchants who complete their SAQ or ASV scans with another provider tend to want evidence that travels on its own.
The short list
| Option | How it works | Makes sense for | Comparison |
|---|---|---|---|
| Proteside | A script on the payment page checks every QR code, payment key, bank slip line, wallet address and card field against what your server issued, and blocks the swap before confirmation. | Merchants paid through instant rails such as UPI, PromptPay, PayNow or Pix, by card, by bank slip or in stablecoins, who need protection and PCI DSS evidence from a single install. | SecurityMetrics vs Proteside |
| Reflectiz PCI Module | An automated browser visits payment pages from outside, on a schedule, with no code on the site; blocking, when triggered in the interface, injects a CSP policy that excludes a domain. | Teams that cannot or prefer not to place a script on the page and accept detection with human review. | Reflectiz vs Proteside |
| Feroot PaymentGuard e DXSecure | Inventories the scripts on payment pages, records justifications and integrity, and alerts on changes to content and headers; runtime policy enforcement is described as optional. | Card-centric operations that need script governance across websites and mobile apps, with a report for the assessor. | Feroot vs Proteside |
| c/side Script Security | A snippet on the page watches third-party scripts in real sessions, keeps a history of what each script loaded and blocks by combining CSP with its own rules, with no reverse proxy and no DNS change. | Teams that want detailed visibility into the behavior of every third-party script, with compliance dashboards and alerts in chat tools. | c/side vs Proteside |
| Cloudflare Client-Side Security (antes Page Shield) | From the proxy, Cloudflare adds a report-only CSP header to a sample of pages and builds the inventory from browser reports; blocking happens through allow rules in the advanced tier. | Sites already behind Cloudflare that want script monitoring with nothing to install. | Cloudflare Page Shield vs Proteside |
| Akamai Client-Side Protection & Compliance (antes Page Integrity Manager) | Akamai's edge injects a detection script at the top of the page (or it is placed at the origin), analyzes script behavior and lets you restrict a malicious script with one click in the console. | Large operations on Akamai that want network threat intelligence and script inventory managed in the same console. | Akamai Client-Side Protection vs Proteside |
Choose the category before the vendor
Pick the category before the vendor. External monitors such as Shopping Cart Monitor and Reflectiz deliver inventory and alerts with no code on the site, from simulated visits at intervals. Agents on the page such as Feroot and c/side watch real sessions and usually block unauthorized scripts. CDN and WAF modules such as Cloudflare's and Akamai's apply a policy from the edge and make the most sense for sites already on that platform.
All three families look at scripts. None of them, as far as their public documentation describes, checks whether the UPI QR code, the PayNow identifier or the wallet address on screen is the one the merchant issued. That check is Proteside's category, and it includes the script inventory and the 6.4.3 and 11.6.1 evidence in the same installation.
The options in detail
Proteside
Proteside records what is legitimate on each payment page (the details of each charge, the form fields, the authorized scripts) and continuously verifies, in the payer's browser, what is displayed, what is copied and where the data goes. When it detects a mismatch, it stops the action before the payment is confirmed and logs the attempt.
The script inventory and the change history form the evidence for PCI DSS requirements 6.4.3 and 11.6.1. Installation is one line of code on any e-commerce platform, or a single integration for platforms and payment providers, with a dashboard, API and alerts.
Proteside is the right choice when: Choose Proteside when your checkout is paid through instant rails, bank slips or stablecoins as well as cards, when you need the payee swap blocked in real sessions, or when you want protection and PCI DSS evidence without changing your CDN.
Reflectiz PCI Module
Reflectiz describes its own approach as agentless: a sandboxed browser simulates the user journey, inventories scripts (including inside iframes), monitors headers for requirement 11.6.1 and exports evidence for the QSA. The platform also covers privacy and offensive testing.
The vendor's own material explains blocking as a script that stays inactive on the page until triggered in the interface, when it starts excluding a domain through CSP. It is a design choice: detection first, human intervention second. Scams that appear only to one specific buyer are not observed by simulated visits.
Reflectiz is the right choice when: your internal policy forbids adding scripts to the payment page and your security team reviews alerts before acting.
Feroot PaymentGuard e DXSecure
Feroot centers its offer on compliance: PaymentGuard covers requirements 6.4.3 and 11.6.1 with script inventory, justifications, integrity checks and an evidence report for the QSA. Public documentation cites integrations with alerting and operations tools, and coverage of iOS and Android apps alongside websites.
The point to watch for anyone paid outside cards is scope: the public material speaks of scripts and card data, with no mention of QR codes, payment keys, boleto (Brazilian bank slip) or crypto wallets. For those payment methods, a payee swap sits outside what the tool describes checking.
Feroot is the right choice when: your priority is script governance and PCI DSS evidence across websites and mobile apps, and your checkout is paid mostly by card.
c/side Script Security
c/side defines itself as a client-side security platform. Public material describes an inventory with the content history of each script, a vendor graph, alerts, dashboards for requirements 6.4.3 and 11.6.1 and an endpoint for receiving CSP reports.
Its public page on crypto cites the swap of a wallet address copied to the clipboard, which brings it close to the problem Proteside solves. Pix, boleto (Brazilian bank slip) and the QR codes of instant payment rails such as UPI or PromptPay do not appear in the public documentation we consulted.
c/side is the right choice when: you want the detail of each third-party script's behavior and a crypto address swap is already your main concern outside cards.
Cloudflare Client-Side Security (antes Page Shield)
The feature, called Page Shield until March 2026 and now Client-Side Security, is available for domains proxied through Cloudflare. Documentation describes monitoring of scripts, connections and cookies, detection of malicious scripts and code changes, and content security rules that can block anything outside the allow list.
The documentation itself explains the mechanism: the report-only header goes out on a sample of responses, so a new script can take time to appear. Requirements 6.4.3 and 11.6.1 are covered in the advanced tier. Pix, boleto (Brazilian bank slip) and instant payment rails do not appear in the material.
Cloudflare Page Shield is the right choice when: your site is already behind Cloudflare, cards are the main payment method and sampled script monitoring satisfies your assessor.
Akamai Client-Side Protection & Compliance (antes Page Integrity Manager)
Client-Side Protection & Compliance (formerly Page Integrity Manager) inventories scripts, applies justifications and rules, monitors headers for requirement 11.6.1 and alerts on unauthorized scripts, payment data exfiltration and tampering. Public documentation says detections work for any site, wherever it is hosted, with configuration in the Akamai console.
Script injection can be set to a percentage of page views, and mitigation is described as a restriction applied with one click. For full coverage, injection has to run on every page view. The material covers scripts and card data; it does not address QR codes, payment keys or bank slip lines.
Akamai Client-Side Protection is the right choice when: your operation already runs on Akamai, your security team operates the console and human-approved mitigation fits your process.
How to evaluate an alternative
- 1What does your payment page display? If there are instant payment QR codes, bank transfer details, bank slips or wallet addresses, the tool has to verify that data and not only the scripts.
- 2What happens between two scans? Ask the vendor whether an attack that lasts an hour, or appears for a single shopper, would be seen.
- 3Who acts when something changes? Automatic blocking in the session, or an alert for a person to review and justify?
- 4Where does the evidence live? In the assessor's portal, in the tool's dashboard, or in an exportable report any QSA will accept?
- 5Can you add a script to the page? If not, external monitors are the option, with the limits they themselves state.
- 6Does the operation depend on a specific CDN? Edge modules only work for sites already on that platform.
Frequently asked questions
What is the best alternative to SecurityMetrics?
It depends on what is missing today. If you only need evidence without code, Reflectiz is in the same family. If you need scripts blocked in real sessions, Feroot and c/side do that on the page. If the checkout accepts UPI, PromptPay, PayNow, Pix, bank slips or stablecoins, payment verification appears in Proteside's public documentation.
What does a SecurityMetrics alternative need to cover?
At minimum, what Shopping Cart Monitor already describes: a script inventory with justification, detection of changes to the page and its headers, and a log for the assessor. If the goal is prevention, add blocking in the shopper's browser. If the checkout goes beyond cards, add payee verification.
Who are the competitors of SecurityMetrics?
In external monitoring, Reflectiz. Among agents on the page, Feroot, c/side, Jscrambler, Source Defense and HUMAN Security. Among CDN and WAF modules, Cloudflare Client-Side Security, Akamai Client-Side Protection & Compliance, Imperva and F5. Proteside compares itself with all of them on these pages.
Does Proteside replace SecurityMetrics?
It depends on the role SecurityMetrics plays for you. On the payment page, Proteside covers the script inventory and requirements 6.4.3 and 11.6.1, and adds blocking in real sessions and payment verification. The PCI DSS assessment, the questionnaire and the ASV scans stay with your assessor; the two tools can run side by side.
All guides
- Feroot alternatives
- c/side alternatives
- Jscrambler alternatives
- Source Defense alternatives
- HUMAN Security alternatives
- Reflectiz alternatives
- Cloudflare Page Shield alternatives
- Akamai Client-Side Protection alternatives
- Imperva Client-Side Protection alternatives
- F5 Client-Side Defense alternatives
- All comparisons
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