# Signifyd

**Canonical:** https://apis.io/providers/signifyd/  
**Website:** https://www.signifyd.com  
**APIs profiled:** 8

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.

## Kin Score — 26.1 / 100 (emerging)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 26.1).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 57.1 |
| Commercial Clarity | 31.6 |
| Access Clarity | 31.6 |

Regulatory layer — **Payments**: 40.6 (matched via tags).

## Agent readiness — 2.5 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## APIs (8)

- **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...

## Security (2)

- **Signifyd Domain Security** — TLSv1.3 · HSTS · DMARC
- **Signifyd Vulnerability Disclosure** — security.txt · contact published

## Tags

Fraud, Fraud Prevention, Chargebacks, E-Commerce, Payments, Risk, Machine-Learning, Commerce Protection, Account Protection, Returns

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/signifyd/). Scores are computed from the provider's own public artifacts under a published rubric.