Fraud Detection & Transaction Risk
C

Callsign

Callsign recognises returning bank customers by how they behave rather than by what they know, combining behavioural biometrics, device intelligence and contextual analytics through an orchestration engine that decides what authentication a given interaction actually needs. It covers account login, payments, account creation and network access, against account takeover, social engineering scams, malware and bots, SIM swap and call diversion, and synthetic identity.

Its dynamic intervention capability detects social engineering in real time and sends the customer a contextual, personalised warning before they transfer money to a fraudster, and it fuses telecommunications network signals indicating a live call during a payment. The company publishes commissioned economic research on digital exclusion and frames security as enabling access rather than restricting it.

Last VerifiedAugust 14, 2026
Compare Callsign with other vendors
Founded
Headquarters
London, United Kingdom
Categories
fraud-and-transaction-risk, aml-kyc-financial-crime, customer-banking-agents
Assessment

Capability Axes

Capability grades

15 of 15 axes rated · 11 graded A or B

AI Capability
AI Centrality
AA on AI CentralityThe artificial intelligence is the product. Remove the models and there is nothing left to sell.
Vendor Published

The removal test leaves a conventional multi factor prompt, which is exactly the friction the product exists to remove. Behavioural biometrics infer identity from how a person types and swipes, device intelligence establishes what they are using, and contextual analytics decide in real time what assurance a given interaction needs, with an orchestration engine sequencing the result.

Detecting social engineering while it is happening, from patterns in behaviour rather than in the transaction, is model work with no rules equivalent, and the company's identity claim rests on recognition rather than on credentials.

Autonomy and Oversight Model
BB on Autonomy and Oversight ModelA written commitment that the models work alongside human judgment, with real review surfaces, short of the full control structure: commonly the threshold at which the system stops or what happens after it is wrong.
Vendor Published

The intervention design keeps the customer in the decision rather than removing them from it. On detecting social engineering in progress the system does not silently block the payment but delivers a contextually relevant, personalised warning to the person about to send the money, so the human retains the choice while being told what the system has seen. That is a materially different posture from a fraud engine that declines and explains nothing.

Authentication itself is automatic and deliberately invisible, with a customer quote confirming users notice nothing different. What is absent is any description of thresholds, of what happens when a customer proceeds despite a warning, or of escalation to a human at the bank.

Model Risk Management and Transparency
BB on Model Risk Management and TransparencyReal transparency mechanisms are published, such as per alert explainability, confidence scoring or split testing, without the validation package or supervisory mapping behind them.
Vendor Published

Three figures are published and the most important is stated in the right form, that solutions detect 40 percent more fraud while maintaining 99 percent acceptance rates, which holds the customer experience metric fixed while moving the detection metric and is the correct way to demonstrate genuine improvement rather than a shifted threshold. A separate result records a 70 percent fraud detection rate where telecommunications scam signals are combined with the company's own intelligence.

The third invites scrutiny rather than confidence: a 99.999 percent precision claim for the behavioural recognition feature is an extraordinary figure for this modality, published without methodology, sample or definition, and a number that precise needs its working shown.

Operational and Outcome Evidence
BB on Operational and Outcome EvidenceVendor aggregate claims with real figures, or audited scale disclosures from a publicly listed company.
Vendor Published

Customers are quoted but not named, described as a major United States bank and a tier one retail bank, with the second observing that most of its customers detect nothing different about the experience, which is the right compliment for an authentication product. A 35 million dollar round closed in 2024, the platform is listed and reviewed on a major analyst peer review service, and a telecommunications partnership supplies live network signals.

Published performance figures are unusually specific for this category. The gap is naming: no institution is identified, and for a vendor whose customers are tier one banks in two markets, that leaves the scale of deployment unverifiable.

AI Safety and Data Stewardship
CC on AI Safety and Data StewardshipGeneral assurances that do not answer the question this axis asks, which is whether one customer’s data trains models serving its competitors. Unbounded cross client learning stated with no boundary grades here too.
Vendor Published

No data boundary statement was located. Behavioural models improve with exposure to more users and more fraud, and the platform serves competing banks in the same markets while additionally fusing telecommunications network intelligence that spans all of them, so what is learned from one institution's customers is directly valuable to another. Nothing states whether behavioural profiles or fraud patterns are contained per customer, whether an institution can decline to contribute, or how network derived signals are separated between banks.

Regulatory and Compliance
GLBA and Data Privacy Posture
CC on GLBA and Data Privacy PostureA standard privacy policy that covers the website rather than the service, or silence on a product that touches limited consumer data.
Vendor Published

Privacy is asserted as a design property, with the technology described as delivering unparalleled privacy and security alongside minimal friction, and no mechanism, retention schedule, subprocessor list or data processing term was located to support it.

The payload deserves more than an assertion, because behavioural biometrics means continuously observing how an individual types, swipes and holds a device, which is biometric data about the person rather than about the transaction, and it is collected passively during ordinary use rather than at a moment the customer recognises as verification.

Security Certifications and Trust Center
CC on Security Certifications and Trust CenterA single footer line, or certifications asserted without being enumerated, which is weaker than naming them because it invites an assumption a buyer cannot check.
Vendor Published

A security section exists on the company's site and no attestation, certification, trust centre content or enumerated framework was located in accessible material. Deployment at tier one banks in two markets means vendor security assessment has been passed repeatedly at demanding standards, and telecommunications integration adds a further layer of scrutiny, so the assurance exists privately while nothing is published for a prospective buyer to read.

Regulatory Status and Licensure
BB on Regulatory Status and LicensureThe regulatory position is clearly stated and appropriate to the product, with part of the verification left to the buyer.
Vendor Published

A regulator and a specific regime are named rather than gestured at, with the company writing about banks preparing for the payment regulator's changes on scam reimbursement, which is the rule that shifted liability for authorised push payment fraud onto banks and created the market this product serves. That is the correct instrument for a scam prevention business and naming it demonstrates the product was built against a defined obligation.

Zero trust access is addressed as a distinct journey. What holds this below the top grade is that no statute, authentication standard or supervisory expectation is cited, and no jurisdictional coverage of those regimes is described.

AI Governance and Bias Disclosure
BB on AI Governance and Bias DisclosureAn independent demographic evaluation the vendor has submitted to, such as the NIST face evaluation class, or a governance framework with named process behind it.
Vendor Published

This vendor commissions and publishes economic research on digital exclusion, which is not something fraud vendors ordinarily do. Work with an economics consultancy found that only around two thirds of the population have positive online experiences and that more than a third of the global population has difficulty accessing online services, and the company frames security as the thing that lets people get on with their digital lives rather than as a barrier, publishing an acceptance rate alongside its detection rate so that both sides of the trade off are visible.

Against that, behavioural biometrics is precisely the modality where performance varies with age, motor control, disability and device, so the people who type and swipe atypically are those most likely to be challenged, and no performance breakdown across those populations is published.

AI Liability and Recourse
BB on AI Liability and RecourseA published falsifiable commitment such as an accuracy figure with its method, or a real correction route for the affected person, such as step up verification instead of silent denial.
Vendor Published

No commercial guarantee or indemnity was located, and one design choice does something no other fraud vendor in this index does: it speaks to the person at risk. When social engineering is detected the system delivers a personalised warning to the customer in the moment, explaining the danger before they send money, which converts a silent institutional risk decision into information the affected person can act on.

Everywhere else in this lane the output goes to the institution and the customer learns only that something was declined. What is missing is the other half, since nothing describes recourse for a customer wrongly challenged or blocked, or how a false positive is corrected.

Integration and Deployment
Model Supply Chain Disclosure
BB on Model Supply Chain DisclosureSubstantial partial disclosure, or a chain that is structurally short: an explicit in house build, on premise deployment, per customer instances, or zero retention at the model layer.
Vendor Published

The most consequential external dependency is disclosed by type, with telecommunications operator scam signals identified as an intelligence source combined with the company's own models, which tells a buyer that part of the detection capability originates outside the platform and depends on carrier relationships in each market. Behavioural and device models appear to be the company's own. What is not disclosed is any individual provider, no carrier is named, no model provider is identified for the analytics layer, and no subprocessor list or hosting arrangement was located.

Core Systems and Integration Depth
BB on Core Systems and Integration DepthNamed systems or a documented public API, with the depth or the production evidence left open.
Vendor Published

An orchestration engine sits at the centre, controlling which authentication or intervention applies to a given journey, which is what allows the platform to coordinate several signal types rather than deliver one. Integration with existing systems is stated, a documentation portal and partner programme exist, and the most substantive external connection is with telecommunications operators, ingesting network derived scam signals that indicate a customer is on a live call while making a payment. That is intelligence a bank cannot obtain on its own. What is not published is any named banking system, so a buyer cannot establish what implementation involves.

Deployment Model and Data Residency
CC on Deployment Model and Data ResidencyCloud only with nothing stated, which is the category norm.
Vendor Published

No hosting provider, region selection, residency commitment or private deployment option was located. The question carries weight because behavioural biometric profiles are personal data of a category treated as sensitive in several markets served, and the company operates across the United Kingdom, the United States and Asia, with telecommunications signal fusion adding further jurisdictional complexity that nothing published addresses.

Commercial
Commercial Transparency
BB on Commercial TransparencyA published plan ladder, billing dimensions, or a stated commitment such as no fees, so a buyer can size the cost before making contact.
Third Party Estimated

No rate is published and the charging basis is, through independent analyst documentation which records volume or usage based licensing determined by number of users, authentication transactions or service integrations. That tells a bank which of its own metrics will drive cost, which is the question that actually matters when authentication volume runs to millions of events, and it identifies three distinct pricing dimensions rather than one. Held at B because the disclosure reaches the reader through a third party rather than the company, and no indicative figure accompanies it.

Institution and Segment Coverage
BB on Institution and Segment CoverageNamed segments with dedicated material behind part of the coverage.
Vendor Published

Coverage is organised around customer journeys rather than product modules, spanning account login and access, online payments and transactions, account creation and registration, and zero trust network access, so the same intelligence serves onboarding, transacting and internal security.

Five distinct fraud vectors are addressed by name, covering account takeover, social engineering and scams, malware and bots, network level attacks through SIM swap and call diversion, and synthetic identity. Buyers are banks in the United States and United Kingdom with stated expansion into new sectors. The limit is that no institution type beyond banking is evidenced.

Head to Head

Compared With

Most editorial comparisons pair two vendors the index assesses as direct competitors for the same buyer. Some pair vendors that are adjacent rather than rival, where the useful question is where one ends and the other begins. Each carries a verdict, the buyer conditions that favor each vendor, and a graded side by side.

Alternatives to Callsign

The closest documented capability profiles to Callsign in the same categories, ordered by similarity across the same fifteen axes the index grades every vendor on. Closest documented profile, not a claim that either product does the same job. No vendor pays for placement.

A lighter documented profile than Callsign

A lighter documented profile than Callsign

Stronger documented coverage on Operational and Outcome Evidence and Institution and Segment Coverage

A lighter documented profile than Callsign

Documents AI Safety and Data Stewardship where Callsign does not

Stronger documented coverage on Operational and Outcome Evidence and Institution and Segment Coverage

Similarity is computed axis by axis from published grades, not from a composite score. The index does not aggregate grades into a total. See the fifteen axes and the methodology.

Commercial

Pricing

Vendor-published figures are labeled as such. Figures labeled “Estimated” are derived from third-party sources and have not been confirmed by the vendor.

No pricing data has been verified for this vendor. Pricing information will be published here once confirmed through vendor disclosure or third-party estimation.

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AI FinTech Index

The AI FinTech Index is an independent index that tracks changes to AI vendors in financial services. It holds 489 vendors across banking, lending, insurance, wealth, capital markets and financial crime compliance, each graded on the same 15 capability axes from public sources. No vendor pays for inclusion, placement, or rating.

Index Status
Last index update
September 5, 2026
The AI FinTech Index is an editorial reference, not a regulatory body. Vendor data is verified against published sources and public regulatory filings. Figures labeled “Estimated” have not been confirmed by the vendor. See the Methodology page for evaluation standards and limitations.
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