This is not our API. This repository is an independent, third-party profile of a company's publicly available API surface, maintained by API Evangelist. API Evangelist does not operate, host, resell, or support this company's APIs, and is not affiliated with or endorsed by the company unless stated on the profile.
Where the information came from. Everything here is assembled from material a member of the public can reach with a browser and no credentials — the company's own website, developer portal and documentation, the specifications it publishes for public use (OpenAPI, AsyncAPI, JSON Schema,
apis.json,llms.txtand similar), its public repositories, and its public status, pricing and changelog pages. Nothing here is obtained by breaching a system, defeating an access control, or using credentials of any kind.The rating is an independent assessment. The Kin Score and Agent Readiness rating are independently calculated scores of a company's public API artifacts, produced by API Evangelist against a published rubric. They are not certifications, endorsements, security assessments, or audits, and they score published artifacts — not the quality, safety, or security of the software.
Corrections, re-scores, and removal are free. No partnership, contract, or purchase is required, and you do not need to justify the request.
- Something wrong? Open an issue on this repository, or email info@apievangelist.com.
- Published something new? Ask for a re-score and we will re-run the rating.
- Want the listing taken down? Say so and we will honor it. The profile is reduced to your company name, a factual description, and a link to your own site, and the company is recorded as unrated — never scored zero for having asked.
Response times. Acknowledgement within one business day; removal or restriction within two business days; corrections and re-scores within five business days.
On a security or compliance team? Email info@apievangelist.com with security in the subject line and you will get a person, not a form. We will tell you exactly which public URLs this profile was built from so your team can see the same surface we did, and we will take the listing down on request while you work through it.
Full detail: Where this data comes from
Signifyd is an ecommerce fraud prevention, chargeback protection, and revenue optimization platform headquartered in San Jose, California. Its Commerce Protection Platform applies machine learning, elastic linking, and a merchant consortium covering roughly 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 and/or asynchronous webhooks, and Signifyd financially guarantees approved orders against fraudulent chargebacks.
URL: Visit APIs.json
Run: Capabilities Using Naftiko
- Fraud, Fraud Prevention, Chargebacks, Ecommerce, Payments, Risk, Machine Learning, Commerce Protection, Account Protection, Returns
- Created: 2026-05-25
- Modified: 2026-05-25
Submit checkout and sale events for real-time fraud and chargeback risk evaluation. Checkout flow supports pre-authorization screening; Sale flow handles post-authorization order submission. Returns a guarantee decision (ACCEPT / HOLD / REJECT) within hundreds of milliseconds.
Human URL: https://developer.signifyd.com/main/reference
Submit finalized order and payment transaction details after authorization so Signifyd can reconcile the pre-auth Checkout decision with the captured transaction and finalize the chargeback guarantee.
Human URL: https://developer.signifyd.com/main/reference
Programmatically retrieve guarantee decisions, case details, and policy results — checkpointAction, checkpointActionReason, matched policies, and the ML score — to drive capture, ship, cancel, or manual review.
Human URL: https://developer.signifyd.com/main/reference
Report observed user outcomes back to Signifyd to close the loop between real-time decisions and production reality. Dedicated endpoints cover Account Opening, Login, and Modification flows plus chargeback and fraud outcome reporting.
Human URL: https://developer.signifyd.com/main/docs/feedback-api-overview
Submit return events for evaluation by Signifyd's Return Insights and Return Abuse Prevention models. Powers the Instant Refunds product and helps identify abusive returners.
Human URL: https://developer.signifyd.com/main/reference
Nexus-aware US sales tax calculation, filing, and remittance across state and local jurisdictions.
Human URL: https://developer.signifyd.com/main/reference
Score non-purchase journeys — Account Opening, Login, and Modification — against account takeover, synthetic identity, and bonus abuse. Pairs with dedicated Feedback endpoints per checkpoint.
Human URL: https://developer.signifyd.com/main/reference
Receive asynchronous decision notifications via the ORDER_CHECKPOINT_ACTION_UPDATE topic, 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.
Human URL: https://developer.signifyd.com/main/docs/configuring-webhooks
- Portal — signifyd.com
- Portal — Developer Hub
- Documentation — Developer Docs
- Documentation — API Reference
- Documentation — v3.0 Reference
- Documentation — v2.0 Reference
- GettingStarted
- Authentication
- Pricing
- AboutUs
- Blog
- CaseStudies
- Library
- PrivacyPolicy
- TermsOfService
- Support
- YouTube
- GitHubOrganization
- SDK — PHP
- Integrations — Magento 2
- Integrations — Magento 1
- Integrations — Salesforce Commerce Cloud
- Documentation — API Blueprint repo
FN: Kin Lane
Email: info@apievangelist.com