Justt

Justt is an AI-native chargeback management and dispute-representment platform for high-volume merchants. Its Dynamic Arguments engine assembles evidence-backed representment packages for card disputes across 30+ payment service providers (Stripe, Adyen, PayPal, Braintree, Checkout.com, Worldpay, Chase Paymentech, Nuvei and others), and it also handles pre-chargeback alerts from Ethoca, Verifi CDRN and RDR. Justt publishes a public developer portal at developers.justt.ai with three OpenAPI definitions — a REST API for chargebacks, transactions, evidence, files, merchants and integrations; a Pre-Chargeback Alerts API; and an OpenAPI 3.1 webhook-events specification covering eleven signed event types — plus an RFC 9727 /.well-known/api-catalog, an llms.txt documentation index, a sandbox environment, and a Vanta-hosted trust center.

Justt publishes 9 APIs on the APIs.io network, including Chargebacks API, Data Subjects API, Evidence API, and 6 more. Tagged areas include Company, Payments, Chargebacks, Disputes, and Fraud.

The Justt catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Justt’s developer surface includes authentication, documentation, API reference, getting-started guide, support, engineering blog, sandbox, and 29 more developer resources.

🌐 Visit website 📡 Source on GitHub

56.1/100 strong ▬ flat Agent 52/100 agent ready saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

AccessSelf serve

2 APIs

Company Payments Chargebacks Disputes Fraud Risk Financial-Services E-Commerce Artificial Intelligence Webhook

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Payments & Card Management

BC-1340

ChargebacksEvidencePre-chargeback Alerts

GET /chargebacks POST /chargebacks/{id}/evidence/submit GET /pre-chargeback-alerts/alerts

Compliance Management

BC-130

Data Subjects

POST /data-subjects/removal

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 56.1/100 · strong

Contract Quality 11.6 / 19

Developer Ergonomics 7.4 / 15

Access Clarity 6.5 / 15

Operational Transparency 4.7 / 10

Contract Governance 1.6 / 9

Discoverability 5.7 / 8

Regulatory Posture 9.4 / 15

Create-or-Update Ergonomics 2.2 / 10

Agent readiness — 52/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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 github.com/api-evangelist/justt: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 9

Individual APIs this provider publishes, each with its own machine-readable definition.

Justt Chargebacks API

The Chargebacks API from Justt — 4 operation(s) for chargebacks.

Justt Data Subjects API

The Data Subjects API from Justt — 1 operation(s) for data subjects.

Justt Evidence API

The Evidence API from Justt — 2 operation(s) for evidence.

Justt Files API

The Files API from Justt — 1 operation(s) for files.

Justt Integrations API

The Integrations API from Justt — 2 operation(s) for integrations.

Justt Merchants API

The Merchants API from Justt — 2 operation(s) for merchants.

Justt Pre-chargeback Alerts API

The Pre-chargeback Alerts API from Justt — 3 operation(s) for pre-chargeback alerts.

Justt Sandbox API

The Sandbox API from Justt — 1 operation(s) for sandbox.

Justt Transactions API

The Transactions API from Justt — 1 operation(s) for transactions.

Scroll for all 9

Arazzo Workflows 4

Multi-step API workflows described with the Arazzo specification.

Work a Justt pre-chargeback alert to a reported outcome

Pull pre-chargeback alerts from Ethoca / Verifi, read one, and report its outcome back to Justt using the alert networks' own outcome vocabulary. Note the read operations and th...

ARAZZO

Drive a chargeback through its lifecycle in the Justt sandbox

Create a test chargeback from raw Stripe dispute data in the sandbox, advance it to under_review, then resolve it as won — firing a webhook at each transition so an integration ...

ARAZZO

Submit evidence for a Justt chargeback

Read an open chargeback, upload an evidence file, submit it to the PSP, and poll the asynchronous submission to a terminal state.

ARAZZO

Triage Justt chargebacks and set the representment decision

List open chargebacks, enrich one with additional merchant data, and override whether Justt should represent it. Acceptance is deliberately NOT part of this workflow — it is irr...

ARAZZO

Pricing Plans 1

Published pricing tiers and plan structures.

Justt Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Justt Rate Limits

1 limits

RATE LIMITS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Justt Webhook Events

ASYNCAPI

Security Posture 3

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

Justt Authentication

http/apiKey · 3 schemes

SECURITY

Justt Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Justt Trust Center

SOC 2 Type II, ISO 27001, ISO 27017, ISO 27018

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Justt Scopes

1 scope · authorizationCode

1 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Justt Agentic Access

23 operations · 13 acting · 13 human-in-the-loop

23 operations · 13 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Login

Sandbox

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

WellKnown

WellKnown

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conformance

ErrorCatalog

Lifecycle

Conventions

DataModel

Webhooks

Arazzo

Scroll for all 7

Build 1

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

Access & Security 5

Authentication, authorization, and security posture

DomainSecurity

Authentication

TrustCenter

Compliance

OAuthScopes

Operate 4

Status, limits, changes, and where to get help

Support

StatusPage

Deprecation

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Plans

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 3

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

APICatalog

APICatalog

Overlay

Overlay

Source (apis.yml)

aid: justt
name: Justt
description: Justt is an AI-native chargeback management and dispute-representment platform for high-volume merchants. Its
  Dynamic Arguments engine assembles evidence-backed representment packages for card disputes across 30+ payment service providers
  (Stripe, Adyen, PayPal, Braintree, Checkout.com, Worldpay, Chase Paymentech, Nuvei and others), and it also handles pre-chargeback
  alerts from Ethoca, Verifi CDRN and RDR. Justt publishes a public developer portal at developers.justt.ai with three OpenAPI
  definitions — a REST API for chargebacks, transactions, evidence, files, merchants and integrations; a Pre-Chargeback Alerts
  API; and an OpenAPI 3.1 webhook-events specification covering eleven signed event types — plus an RFC 9727 /.well-known/api-catalog,
  an llms.txt documentation index, a sandbox environment, and a Vanta-hosted trust center.
url: https://raw.githubusercontent.com/api-evangelist/justt/refs/heads/main/apis.yml
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: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  - scopes
  - rate-limits
  - security
  - sandbox
  generated: '2026-09-02'
  method: derived
image: https://justt.ai/wp-content/uploads/2025/03/blog-7-1.jpg
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-08-23'
modified: '2026-08-23'
tags:
- Company
- Payments
- Chargebacks
- Disputes
- Fraud
- Risk
- Financial-Services
- E-Commerce
- Artificial Intelligence
- Webhook
tags_raw:
- Company
- Payments
- Chargebacks
- Disputes
- Fraud
- Risk
- Financial Services
- E-Commerce
- Artificial Intelligence
- Webhooks
apis:
- aid: justt:justt-chargebacks-api
  name: Justt Chargebacks API
  description: The Chargebacks API from Justt — 4 operation(s) for chargebacks.
  humanURL: https://developers.justt.ai/reference
  baseURL: https://api.justt.ai/v1
  tags:
  - Chargebacks
  properties:
  - type: OpenAPI
    url: openapi/justt-chargebacks-api-openapi.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/getting-started
  - type: APIReference
    url: https://developers.justt.ai/reference
  - type: Documentation
    url: https://developers.justt.ai/docs/prevention-tools-overview
  - type: Webhooks
    url: asyncapi/justt-webhook-events.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/webhook-events-event-types
- aid: justt:justt-data-subjects-api
  name: Justt Data Subjects API
  description: The Data Subjects API from Justt — 1 operation(s) for data subjects.
  humanURL: https://developers.justt.ai/reference
  baseURL: https://api.justt.ai/v1
  tags:
  - Data Subjects
  properties:
  - type: OpenAPI
    url: openapi/justt-data-subjects-api-openapi.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/getting-started
  - type: APIReference
    url: https://developers.justt.ai/reference
  - type: Documentation
    url: https://developers.justt.ai/docs/prevention-tools-overview
  - type: Webhooks
    url: asyncapi/justt-webhook-events.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/webhook-events-event-types
- aid: justt:justt-evidence-api
  name: Justt Evidence API
  description: The Evidence API from Justt — 2 operation(s) for evidence.
  humanURL: https://developers.justt.ai/reference
  baseURL: https://api.justt.ai/v1
  tags:
  - Evidence
  properties:
  - type: OpenAPI
    url: openapi/justt-evidence-api-openapi.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/getting-started
  - type: APIReference
    url: https://developers.justt.ai/reference
  - type: Documentation
    url: https://developers.justt.ai/docs/prevention-tools-overview
  - type: Webhooks
    url: asyncapi/justt-webhook-events.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/webhook-events-event-types
- aid: justt:justt-files-api
  name: Justt Files API
  description: The Files API from Justt — 1 operation(s) for files.
  humanURL: https://developers.justt.ai/reference
  baseURL: https://api.justt.ai/v1
  tags:
  - File
  tags_raw:
  - Files
  properties:
  - type: OpenAPI
    url: openapi/justt-files-api-openapi.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/getting-started
  - type: APIReference
    url: https://developers.justt.ai/reference
  - type: Documentation
    url: https://developers.justt.ai/docs/prevention-tools-overview
  - type: Webhooks
    url: asyncapi/justt-webhook-events.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/webhook-events-event-types
- aid: justt:justt-integrations-api
  name: Justt Integrations API
  description: The Integrations API from Justt — 2 operation(s) for integrations.
  humanURL: https://developers.justt.ai/reference
  baseURL: https://api.justt.ai/v1
  tags:
  - Integration
  tags_raw:
  - Integrations
  properties:
  - type: OpenAPI
    url: openapi/justt-integrations-api-openapi.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/getting-started
  - type: APIReference
    url: https://developers.justt.ai/reference
  - type: Documentation
    url: https://developers.justt.ai/docs/prevention-tools-overview
  - type: Webhooks
    url: asyncapi/justt-webhook-events.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/webhook-events-event-types
- aid: justt:justt-merchants-api
  name: Justt Merchants API
  description: The Merchants API from Justt — 2 operation(s) for merchants.
  humanURL: https://developers.justt.ai/reference
  baseURL: https://api.justt.ai/v1
  tags:
  - Merchants
  properties:
  - type: OpenAPI
    url: openapi/justt-merchants-api-openapi.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/getting-started
  - type: APIReference
    url: https://developers.justt.ai/reference
  - type: Documentation
    url: https://developers.justt.ai/docs/prevention-tools-overview
  - type: Webhooks
    url: asyncapi/justt-webhook-events.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/webhook-events-event-types
- aid: justt:justt-pre-chargeback-alerts-api
  name: Justt Pre-chargeback Alerts API
  description: The Pre-chargeback Alerts API from Justt — 3 operation(s) for pre-chargeback alerts.
  humanURL: https://developers.justt.ai/reference
  baseURL: https://api.justt.ai/v1
  tags:
  - Pre-chargeback Alerts
  properties:
  - type: OpenAPI
    url: openapi/justt-pre-chargeback-alerts-api-openapi.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/getting-started
  - type: APIReference
    url: https://developers.justt.ai/reference
  - type: Documentation
    url: https://developers.justt.ai/docs/prevention-tools-overview
  - type: Webhooks
    url: asyncapi/justt-webhook-events.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/webhook-events-event-types
- aid: justt:justt-sandbox-api
  name: Justt Sandbox API
  description: The Sandbox API from Justt — 1 operation(s) for sandbox.
  humanURL: https://developers.justt.ai/reference
  baseURL: https://api.justt.ai/v1
  tags:
  - Sandbox
  properties:
  - type: OpenAPI
    url: openapi/justt-sandbox-api-openapi.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/getting-started
  - type: APIReference
    url: https://developers.justt.ai/reference
  - type: Documentation
    url: https://developers.justt.ai/docs/prevention-tools-overview
  - type: Webhooks
    url: asyncapi/justt-webhook-events.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/webhook-events-event-types
- aid: justt:justt-transactions-api
  name: Justt Transactions API
  description: The Transactions API from Justt — 1 operation(s) for transactions.
  humanURL: https://developers.justt.ai/reference
  baseURL: https://api.justt.ai/v1
  tags:
  - Transaction
  tags_raw:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/justt-transactions-api-openapi.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/getting-started
  - type: APIReference
    url: https://developers.justt.ai/reference
  - type: Documentation
    url: https://developers.justt.ai/docs/prevention-tools-overview
  - type: Webhooks
    url: asyncapi/justt-webhook-events.yml
  - type: Documentation
    url: https://developers.justt.ai/docs/webhook-events-event-types
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: CapabilityMap
  url: capabilities/justt-capability-edges.yml
  name: Justt Business Capability Map
- type: AgenticAccess
  url: agentic-access/justt-agentic-access.yml
- type: DomainSecurity
  url: security/justt-domain-security.yml
- type: Authentication
  url: authentication/justt-authentication.yml
- type: Website
  url: https://justt.ai/
- type: DeveloperPortal
  url: https://developers.justt.ai/
- type: Documentation
  url: https://developers.justt.ai/docs/getting-started
- type: APIReference
  url: https://developers.justt.ai/reference
- type: GettingStarted
  url: https://developers.justt.ai/docs/getting-started
- type: Support
  url: https://developers.justt.ai/docs/contact-us
- type: Blog
  url: https://justt.ai/blog/
- type: Login
  url: https://app.justt.ai/
- type: TermsOfService
  url: https://justt.ai/terms-of-use/
- type: PrivacyPolicy
  url: https://justt.ai/privacy-policy/
- type: StatusPage
  url: https://status.justt.ai/
- type: TrustCenter
  url: https://trust.justt.ai/
- type: Compliance
  url: https://trust.justt.ai/
- type: APICatalog
  url: well-known/justt-well-known.yml
- type: WellKnown
  url: well-known/justt-well-known.yml
- type: X-MCPServerCandidate
  url: mcp/justt-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: ToolCrosswalk
  url: mcp/justt-tool-crosswalk.yml
- type: LLMsTxt
  url: llms/justt-llms.txt
- type: Overlay
  url: overlays/justt-rest-api-overlay.yaml
- type: Conformance
  url: conformance/justt-conformance.yml
- type: ErrorCatalog
  url: errors/justt-problem-types.yml
- type: Lifecycle
  url: lifecycle/justt-lifecycle.yml
- type: Deprecation
  url: https://developers.justt.ai/docs/legacy-api-to-rest-api-migration-guide
- type: OAuthScopes
  url: scopes/justt-scopes.yml
- type: Sandbox
  url: sandbox/justt-sandbox.yml
- type: Conventions
  url: conventions/justt-conventions.yml
- type: DataModel
  url: data-model/justt-data-model.yml
- type: Webhooks
  url: asyncapi/justt-webhook-events.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Plans
  url: plans/justt-plans-pricing.yml
- type: RateLimits
  url: rate-limits/justt-rate-limits.yml
- type: Arazzo
  url: arazzo/_index.yml
x-enrichment:
  date: '2026-08-23'
  status: enriched
  artifacts_added: 38
  pass: local-v1

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