Signifyd
Signifyd is an ecommerce fraud prevention, chargeback protection, and revenue optimization platform. Its Commerce Protection Platform applies machine learning, elastic linking, and the merchant consortium network (covering ~98% of US online shoppers) to make real-time guarantee decisions on orders. Merchants integrate via the Checkout, Sale, Transaction, Decisions, Returns, Sales Tax, and Feedback APIs (v2 and v3) with synchronous responses or asynchronous webhooks, plus device-fingerprinting scripts and Android/iOS SDKs. Signifyd financially guarantees approved orders against chargebacks and offers Account Protection, Payments Optimization, and Return Abuse Prevention as adjacent products.
More than an index entry, but the surface is still mostly links rather than artifacts — the cohort most likely to move a full band from modest, well-targeted work.
API Evangelist profiles Signifyd the way a machine reads it — 26 machine-readable artifacts across 8 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Signifyd scores 26.1/100 (emerging), with a separate agent-readiness read of 3/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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How we profile Signifyd
Each block below is one kind of artifact we hold for Signifyd. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 8
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Signifyd Sale (Checkout) API
Submit checkout and sale events to Signifyd's Commerce Protection Platform for real-time fraud and chargeback risk evaluation. The Checkout flow supports pre-authorization scree...
Signifyd Transaction API
Submit finalized order and payment transaction details after authorization. Enables Signifyd to reconcile the pre-auth Checkout decision with the captured transaction, evaluate ...
Signifyd Decisions API
Programmatically retrieve guarantee decisions, case details, and policy results for orders submitted to Signifyd. Surfaces the checkpointAction (ACCEPT/HOLD/REJECT), checkpointA...
Signifyd Feedback API
Report observed user outcomes back to Signifyd to close the loop between real-time decisions and production reality. Feedback drives model improvement, business customization, a...
Signifyd Returns API
Submit return events for evaluation by Signifyd's Return Insights and Return Abuse Prevention models. Helps merchants identify abusive returners, automate refund decisions, and ...
Signifyd Sales Tax API
Calculate and remit US sales tax across jurisdictions using Signifyd's Sales Tax product. Provides nexus-aware rate lookup, tax calculation at checkout, and the data feeds requi...
Signifyd Account Protection API
Score and protect non-purchase customer journeys — Account Opening, Login, and Modification events — against account takeover, synthetic identity, and bonus abuse. Pairs with de...
Signifyd Webhooks API
Receive asynchronous decision notifications from Signifyd. The primary topic is ORDER_CHECKPOINT_ACTION_UPDATE, covering CHECKOUT, SALE, TRANSACTION, REROUTE, MERCHANT_REVIEW, a...
Scroll within the panel for all 8 ·
Features 16
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Scroll within the panel for all 16 ·
Security Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Signifyd — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 6
Reference material describing how the API behaves
Build 3
SDKs, sample code, and the tooling you integrate with
Access & Security 3
Authentication, authorization, and security posture
Learn 1
Tutorials, courses, talks, and written guidance
Operate 1
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 5
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/signifyd · machine-readable index on apis.io
This is an independent, third-party profile of Signifyd, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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