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.

Signifyd is listed with 8 APIs on the APIs.io network. Tagged areas include Fraud Prevention, Chargebacks, E-Commerce, Payments, and Risk Management.

Signifyd’s developer surface includes developer portal, documentation, getting-started guide, authentication, pricing, engineering blog, support, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

25.0/100 emerging ▬ flat Agent 3/100 human only Front door AI 4/6 moderate Heartbeat 79/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

8 APIs 16 Features

Fraud Prevention Chargebacks E-Commerce Payments Risk Management Machine LearningCommerce ProtectionAccount Protection Returns

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 25.0/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 9.7 / 17

Access Clarity 4.3 / 17

Operational Transparency 1.6 / 11

Contract Governance 0.0 / 10

Discoverability 5.3 / 9

Regulatory Posture 3.3 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Payments regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document Ask about this →
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →

12 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points Ask about this →
Access Clarity scores 25.5 — up to +14.9 composite points Ask about this →
Contract Governance scores 0.0 — up to +12.0 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/signifyd/apis.yml: open an issue on github.com/api-evangelist/signifyd to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Commerce Platform Ecosystems (Shopify, WooCommerce, Stripe Apps)	builds-on	51.7	-	-
MACH & Headless Commerce	builds-on	51.7	-	-
Stripe App Marketplace and Partner Ecosystem (builders on Stripe)	builds-on	51.7	-	-
E-commerce Extension Marketplaces (Adobe Commerce / Magento, Shopware)	builds-on	51.7	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 8

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 for all 8

Features 16

Notable capabilities this provider offers.

Commerce Protection Platform — real-time guarantee decisions on every order

100% financial guarantee against fraudulent chargebacks on approved orders

Merchant consortium network covering ~98% of US online shoppers for elastic linking

Synchronous decision API responses typically returned in hundreds of milliseconds

Asynchronous webhook delivery (ORDER_CHECKPOINT_ACTION_UPDATE) with HMAC-SHA256 signatures

Checkout API for pre-authorization fraud screening

Sale and Transaction APIs for post-authorization order submission

Decisions API to retrieve checkpointAction, policies, and score

Account Protection for Account Opening, Login, and Modification checkpoints

Feedback API to close the loop between decisions and observed outcomes

Returns API powering Return Insights, Return Abuse Prevention, and Instant Refunds

Sales Tax API for nexus-aware US tax calculation, filing, and remittance

Payments Optimization / Fearless Payments for authorization rate uplift and 3DS routing

Device profiling JavaScript snippet and Android/iOS SDKs

Native integrations with Shopify, BigCommerce, Magento/Adobe Commerce, Salesforce Commerce Cloud, SAP Commerce, commercetools, Stripe, Adyen, Braintree, and major marketplaces

Open-source PHP library plus Magento 1, Magento 2, and SFCC cartridges on GitHub

Scroll for all 16

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Signifyd Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Signifyd Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

Portal

Portal

Portal

Portal

GettingStarted

GettingStarted

Documentation 6

Reference material describing how the API behaves

Documentation

Documentation

Documentation

Documentation

Documentation

Documentation

Build 3

SDKs, sample code, and the tooling you integrate with

Library

Library

GitHubOrganization

GitHubOrganization

SDKs

SDKs

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Learn 1

Tutorials, courses, talks, and written guidance

YouTube

YouTube

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 5

The organization behind the API

Website

Website

AboutUs

AboutUs

Blog

Blog

LinkedIn

Twitter

Twitter

Other 1

Properties that don't map to a standard resource type

CaseStudies

CaseStudies

Source (apis.yml)

aid: signifyd
url: https://raw.githubusercontent.com/api-evangelist/signifyd/refs/heads/main/apis.yml
name: Signifyd
description: 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.
x-docs-platform: readme
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-04
tags:
- Fraud Prevention
- Chargebacks
- E-Commerce
- Payments
- Risk Management
- Machine Learning
- Commerce Protection
- Account Protection
- Returns
tags_raw:
- Fraud
- Fraud Prevention
- Chargebacks
- Ecommerce
- Payments
- Risk
- Machine Learning
- Commerce Protection
- Account Protection
- Returns
- Machine-Learning
kind: contract
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/signifyd.png
access: 3rd-Party
apis:
- aid: signifyd:signifyd-sale-api
  name: Signifyd Sale (Checkout) API
  tags:
  - Sale
  - Checkout
  - Fraud Prevention
  - Order
  - E-Commerce
  tags_raw:
  - Sale
  - Checkout
  - Fraud
  - Orders
  - Ecommerce
  humanURL: https://developer.signifyd.com/main/reference
  properties:
  - url: https://developer.signifyd.com/main/reference
    type: Documentation
  - url: https://developer.signifyd.com/main/docs/getting-started
    type: GettingStarted
  description: 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 screening, while the Sale flow handles post-authorization
    order submission. Responses return a guarantee decision — ACCEPT, HOLD, or REJECT — typically within hundreds of milliseconds,
    with results delivered synchronously and/or via the ORDER_CHECKPOINT_ACTION_UPDATE webhook.
- aid: signifyd:signifyd-transaction-api
  name: Signifyd Transaction API
  tags:
  - Transaction
  - Payments
  - Fraud Prevention
  - E-Commerce
  tags_raw:
  - Transactions
  - Payments
  - Fraud
  - Ecommerce
  humanURL: https://developer.signifyd.com/main/reference
  properties:
  - url: https://developer.signifyd.com/main/reference
    type: Documentation
  description: Submit finalized order and payment transaction details after authorization. Enables Signifyd to reconcile the
    pre-auth Checkout decision with the captured transaction, evaluate any post-auth risk signals, and finalize the chargeback
    guarantee. Decision results are delivered via the TRANSACTION checkpoint webhook.
- aid: signifyd:signifyd-decisions-api
  name: Signifyd Decisions API
  tags:
  - Decisions
  - Fraud Prevention
  - Cases
  - Risk Management
  tags_raw:
  - Decisions
  - Fraud
  - Cases
  - Risk
  humanURL: https://developer.signifyd.com/main/reference
  properties:
  - url: https://developer.signifyd.com/main/reference
    type: Documentation
  description: Programmatically retrieve guarantee decisions, case details, and policy results for orders submitted to Signifyd.
    Surfaces the checkpointAction (ACCEPT/HOLD/REJECT), checkpointActionReason, matched policies, and the machine learning
    score so merchants can drive downstream capture, ship, cancel, or manual-review workflows.
- aid: signifyd:signifyd-feedback-api
  name: Signifyd Feedback API
  tags:
  - Feedback
  - Fraud Prevention
  - Machine Learning
  - Chargebacks
  tags_raw:
  - Feedback
  - Fraud
  - Machine Learning
  - Chargebacks
  - Machine-Learning
  humanURL: https://developer.signifyd.com/main/docs/feedback-api-overview
  properties:
  - url: https://developer.signifyd.com/main/docs/feedback-api-overview
    type: Documentation
  - url: https://developer.signifyd.com/main/reference
    type: Documentation
  description: Report observed user outcomes back to Signifyd to close the loop between real-time decisions and production
    reality. Feedback drives model improvement, business customization, and rules optimization. Dedicated endpoints exist
    for the Account Integrity flows (Account Opening, Login, Modification) as well as for chargeback and fraud outcome reporting.
- aid: signifyd:signifyd-returns-api
  name: Signifyd Returns API
  tags:
  - Returns
  - Return Abuse
  - Fraud Prevention
  - Refunds
  tags_raw:
  - Returns
  - Return Abuse
  - Fraud
  - Refunds
  humanURL: https://developer.signifyd.com/main/reference
  properties:
  - url: https://developer.signifyd.com/main/reference
    type: Documentation
  description: Submit return events for evaluation by Signifyd's Return Insights and Return Abuse Prevention models. Helps
    merchants identify abusive returners, automate refund decisions, and power the Instant Refunds product without absorbing
    fraud loss.
- aid: signifyd:signifyd-sales-tax-api
  name: Signifyd Sales Tax API
  tags:
  - Sales Tax
  - Tax
  - Compliance
  - E-Commerce
  tags_raw:
  - Sales Tax
  - Tax
  - Compliance
  - Ecommerce
  humanURL: https://developer.signifyd.com/main/reference
  properties:
  - url: https://developer.signifyd.com/main/reference
    type: Documentation
  description: 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 required for filing and remittance.
- aid: signifyd:signifyd-account-protection-api
  name: Signifyd Account Protection API
  tags:
  - Account Protection
  - Identity
  - Fraud Prevention
  - Authentication
  tags_raw:
  - Account Protection
  - Identity
  - Fraud
  - Authentication
  humanURL: https://developer.signifyd.com/main/reference
  properties:
  - url: https://developer.signifyd.com/main/reference
    type: Documentation
  description: Score and protect non-purchase customer journeys — Account Opening, Login, and Modification events — against
    account takeover, synthetic identity, and bonus abuse. Pairs with dedicated Feedback endpoints for each Account Integrity
    checkpoint so models can adapt to observed outcomes.
- aid: signifyd:signifyd-webhooks-api
  name: Signifyd Webhooks API
  tags:
  - Webhook
  - Event
  - Decisions
  - Async
  tags_raw:
  - Webhooks
  - Events
  - Decisions
  - Async
  humanURL: https://developer.signifyd.com/main/docs/configuring-webhooks
  properties:
  - url: https://developer.signifyd.com/main/docs/configuring-webhooks
    type: Documentation
  - url: https://developer.signifyd.com/main/reference
    type: Documentation
  description: Receive asynchronous decision notifications from Signifyd. The primary topic is ORDER_CHECKPOINT_ACTION_UPDATE,
    covering CHECKOUT, SALE, TRANSACTION, REROUTE, MERCHANT_REVIEW, and SIGNIFYD_REVIEW checkpoints. Each delivery is signed
    with an HMAC-SHA256 signature in the SIGNIFYD-SEC-HMAC-SHA256 header, keyed by the team's API key, so receivers can verify
    authenticity.
common:
- type: Website
  url: https://www.signifyd.com/
- type: VulnerabilityDisclosure
  url: security/signifyd-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/signifyd-domain-security.yml
- url: https://www.signifyd.com
  type: Portal
- url: https://developer.signifyd.com/
  name: Signifyd Developer Hub
  type: Portal
- url: https://developer.signifyd.com/main/docs
  name: Signifyd Documentation
  type: Documentation
- url: https://developer.signifyd.com/main/reference
  name: Signifyd API Reference
  type: Documentation
- url: https://developer.signifyd.com/main/v3.0/reference
  name: Signifyd v3.0 API Reference
  type: Documentation
- url: https://developer.signifyd.com/main/v2.0/reference
  name: Signifyd v2.0 API Reference
  type: Documentation
- url: https://developer.signifyd.com/main/docs/getting-started
  name: Getting Started
  type: GettingStarted
- url: https://developer.signifyd.com/main/docs/authenticating
  name: Authentication
  type: Authentication
- url: https://developer.signifyd.com/main/docs/configuring-webhooks
  name: Configuring Webhooks
  type: Documentation
- url: https://www.signifyd.com/pricing/
  name: Pricing
  type: Pricing
- url: https://www.signifyd.com/about-us/
  name: About Signifyd
  type: AboutUs
- url: https://www.signifyd.com/blog/
  name: Signifyd Blog
  type: Blog
- url: https://www.signifyd.com/customers/
  name: Customers
  type: CaseStudies
- url: https://www.signifyd.com/resources/
  name: Resources
  type: Library
- url: https://www.signifyd.com/legal/privacy-policy/
  type: PrivacyPolicy
- url: https://www.signifyd.com/legal/terms-of-use/
  type: TermsOfService
- url: https://support.signifyd.com/
  name: Signifyd Support
  type: Support
- url: https://www.linkedin.com/company/signifyd
  type: LinkedIn
- url: https://twitter.com/signifyd
  type: Twitter
- url: https://www.youtube.com/c/Signifyd
  type: YouTube
- url: https://github.com/signifyd
  name: Signifyd on GitHub
  type: GitHubOrganization
- url: https://github.com/signifyd/php
  name: PHP Library
  type: SDKs
- url: https://github.com/signifyd/magento2
  name: Magento 2 Extension
  type: Integrations
- url: https://github.com/signifyd/magento1
  name: Magento 1 Extension
  type: Integrations
- url: https://github.com/signifyd/Salesforce-Commerce-Cloud
  name: Salesforce Commerce Cloud Cartridge
  type: Integrations
- url: https://github.com/signifyd/docs
  name: Signifyd API Blueprint
  type: Documentation
- type: Features
  data:
  - Commerce Protection Platform — real-time guarantee decisions on every order
  - 100% financial guarantee against fraudulent chargebacks on approved orders
  - Merchant consortium network covering ~98% of US online shoppers for elastic linking
  - Synchronous decision API responses typically returned in hundreds of milliseconds
  - Asynchronous webhook delivery (ORDER_CHECKPOINT_ACTION_UPDATE) with HMAC-SHA256 signatures
  - Checkout API for pre-authorization fraud screening
  - Sale and Transaction APIs for post-authorization order submission
  - Decisions API to retrieve checkpointAction, policies, and score
  - Account Protection for Account Opening, Login, and Modification checkpoints
  - Feedback API to close the loop between decisions and observed outcomes
  - Returns API powering Return Insights, Return Abuse Prevention, and Instant Refunds
  - Sales Tax API for nexus-aware US tax calculation, filing, and remittance
  - Payments Optimization / Fearless Payments for authorization rate uplift and 3DS routing
  - Device profiling JavaScript snippet and Android/iOS SDKs
  - Native integrations with Shopify, BigCommerce, Magento/Adobe Commerce, Salesforce Commerce Cloud, SAP Commerce, commercetools,
    Stripe, Adyen, Braintree, and major marketplaces
  - Open-source PHP library plus Magento 1, Magento 2, and SFCC cartridges on GitHub
  sources:
  - https://www.signifyd.com
  - https://developer.signifyd.com/
  - https://developer.signifyd.com/main/docs/getting-started
  - https://developer.signifyd.com/main/docs/configuring-webhooks
  - https://github.com/signifyd
  updated: '2026-05-25'
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com
  X: apievangelist
  url: https://apievangelist.com
created: '2026-05-25'
modified: '2026-05-25'
position: Consuming
specificationVersion: '0.23'

Signifyd API — frequently asked questions

Does Signifyd have an API?

Yes. APIs.io lists 8 APIs from Signifyd, including Signifyd Sale (Checkout) API, Signifyd Transaction API and Signifyd Decisions API, and 5 more.

How do I authenticate with the Signifyd API?

Signifyd uses bearer-token authentication.

Is the Signifyd API ready for AI agents?

Signifyd has a Kin Score of 25.0 out of 100 (emerging) and an Agent Readiness score of 2.5 (human-only), scored by API Evangelist on 2026-11-13.

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