Slope

Slope is a fintech company providing credit infrastructure for business lending - an embedded buy-now-pay-later (BNPL) and working-capital solution that lets merchants offer flexible net-terms financing to their business (B2B) buyers at checkout with no added risk. Its platform combines an embedded line-of-credit product, the SlopeScore business cash-flow score for underwriting, and a developer API (v4) for creating customers and orders, driving checkout via the Slope.js widget or a hosted redirect, finalizing orders for payout, issuing refunds/adjustments, handling repayments, and subscribing to webhook events. Slope is backed by GGV Capital and has announced a relationship with Amazon.

Slope publishes 10 APIs on the APIs.io network, including Auth API, Customers API, Files API, and 7 more. Tagged areas include Company, Fintech, Payments, Embedded Finance, and BNPL.

The Slope catalog on APIs.io includes 2 event-driven AsyncAPI specifications.

Slope’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, sandbox, changelog, and 28 more developer resources.

🌐 Visit website 📡 Source on GitHub
54.7/100 developing ▬ flat Agent 87/100 agent native Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
10 APIs 1 MCP Servers
CompanyFintechPaymentsEmbedded FinanceBNPLLendingCreditB2BCheckout

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 54.7/100 · developing
Contract Quality 17.0 / 25
Developer Ergonomics 14.8 / 20
Commercial Clarity 6.8 / 20
Operational Transparency 6.2 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 87/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/slope: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 10

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

Slope Auth API

The Auth API from Slope — 2 operation(s) for auth.

Slope Customers API

The Customers API from Slope — 6 operation(s) for customers.

Slope Files API

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

Slope Orders API

The Orders API from Slope — 11 operation(s) for orders.

Slope Payout Accounts API

The Payout Accounts API from Slope — 2 operation(s) for payout accounts.

Slope Persons API

The Persons API from Slope — 1 operation(s) for persons.

Slope Prescreens API

The Prescreens API from Slope — 2 operation(s) for prescreens.

Slope Simulation API

The Simulation API from Slope — 7 operation(s) for simulation.

Slope Transactions API

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

Slope User Links API

The User Links API from Slope — 2 operation(s) for user links.

Scroll for all 10

Arazzo Workflows 5

Multi-step API workflows described with the Arazzo specification.

_Index

ARAZZO

Create a Slope order and finalize it

Create an order, wait for the customer to open it, then finalize for payout.

ARAZZO

Refund a finalized Slope order

Create a refund adjustment against an order and read it back.

ARAZZO

Estimate and repay a Slope order

Get a repayment estimate then fully repay an order (requires Slope-Link-Token).

ARAZZO

Simulate an approved order in the sandbox

Create a sandbox test customer, set eligibility, create an order, and approve it.

ARAZZO

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

slope-mcp.yml

MCP SERVER

Rate Limits 1

Documented rate limits and quota policies.

Slope Rate Limits

0 limits

RATE LIMITS

Event Specifications 2

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

Slope Webhook Events

Generated event surface for Slope webhooks. Payload schemas documented at https://developers.slopepay.com/docs/schema. Signed via the Slope-Signature header (HMAC-SHA256).

ASYNCAPI

Slope Webhooks

ASYNCAPI

Security Posture 2

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

Slope Authentication

http · 1 scheme

SECURITY

Slope Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Slope Agentic Access

40 operations · 25 acting

40 operations · 25 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 Login
Login
 Sandbox
Sandbox

Documentation 3

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference
 AsyncAPI
AsyncAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 MCPServer
MCPServer
 AgenticAccess
AgenticAccess
 AgentSkill
AgentSkill

Design & Contract 12

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conventions
Conventions
 Idempotency
Idempotency
 Components
Components
 DataModel
DataModel
 Webhooks
Webhooks
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo

Scroll for all 12

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Operate 5

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage
 Deprecation
Deprecation
 RateLimits
RateLimits
 ChangeLog
ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: slope
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/slope.png
name: Slope
description: Slope is a fintech company providing credit infrastructure for business lending - an embedded buy-now-pay-later
  (BNPL) and working-capital solution that lets merchants offer flexible net-terms financing to their business (B2B) buyers
  at checkout with no added risk. Its platform combines an embedded line-of-credit product, the SlopeScore business cash-flow
  score for underwriting, and a developer API (v4) for creating customers and orders, driving checkout via the Slope.js widget
  or a hosted redirect, finalizing orders for payout, issuing refunds/adjustments, handling repayments, and subscribing to
  webhook events. Slope is backed by GGV Capital and has announced a relationship with Amazon.
url: https://raw.githubusercontent.com/api-evangelist/slope/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- ggv-capital
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Fintech
- Payments
- Embedded Finance
- BNPL
- Lending
- Credit
- B2B
- Checkout
apis:
- aid: slope:slope-auth-api
  name: Slope Auth API
  description: The Auth API from Slope — 2 operation(s) for auth.
  humanURL: https://developers.slopepay.com/
  baseURL: https://api.slopepay.com
  tags:
  - Auth
  properties:
  - type: OpenAPI
    url: openapi/slope-auth-api-openapi.yml
  - type: APIReference
    url: https://developers.slopepay.com/reference
  - type: Documentation
    url: https://developers.slopepay.com/docs/getting-started
- aid: slope:slope-customers-api
  name: Slope Customers API
  description: The Customers API from Slope — 6 operation(s) for customers.
  humanURL: https://developers.slopepay.com/
  baseURL: https://api.slopepay.com
  tags:
  - Customers
  properties:
  - type: OpenAPI
    url: openapi/slope-customers-api-openapi.yml
  - type: APIReference
    url: https://developers.slopepay.com/reference
  - type: Documentation
    url: https://developers.slopepay.com/docs/getting-started
- aid: slope:slope-files-api
  name: Slope Files API
  description: The Files API from Slope — 1 operation(s) for files.
  humanURL: https://developers.slopepay.com/
  baseURL: https://api.slopepay.com
  tags:
  - Files
  properties:
  - type: OpenAPI
    url: openapi/slope-files-api-openapi.yml
  - type: APIReference
    url: https://developers.slopepay.com/reference
  - type: Documentation
    url: https://developers.slopepay.com/docs/getting-started
- aid: slope:slope-orders-api
  name: Slope Orders API
  description: The Orders API from Slope — 11 operation(s) for orders.
  humanURL: https://developers.slopepay.com/
  baseURL: https://api.slopepay.com
  tags:
  - Orders
  properties:
  - type: OpenAPI
    url: openapi/slope-orders-api-openapi.yml
  - type: APIReference
    url: https://developers.slopepay.com/reference
  - type: Documentation
    url: https://developers.slopepay.com/docs/getting-started
- aid: slope:slope-payout-accounts-api
  name: Slope Payout Accounts API
  description: The Payout Accounts API from Slope — 2 operation(s) for payout accounts.
  humanURL: https://developers.slopepay.com/
  baseURL: https://api.slopepay.com
  tags:
  - Payout Accounts
  properties:
  - type: OpenAPI
    url: openapi/slope-payout-accounts-api-openapi.yml
  - type: APIReference
    url: https://developers.slopepay.com/reference
  - type: Documentation
    url: https://developers.slopepay.com/docs/getting-started
- aid: slope:slope-persons-api
  name: Slope Persons API
  description: The Persons API from Slope — 1 operation(s) for persons.
  humanURL: https://developers.slopepay.com/
  baseURL: https://api.slopepay.com
  tags:
  - Persons
  properties:
  - type: OpenAPI
    url: openapi/slope-persons-api-openapi.yml
  - type: APIReference
    url: https://developers.slopepay.com/reference
  - type: Documentation
    url: https://developers.slopepay.com/docs/getting-started
- aid: slope:slope-prescreens-api
  name: Slope Prescreens API
  description: The Prescreens API from Slope — 2 operation(s) for prescreens.
  humanURL: https://developers.slopepay.com/
  baseURL: https://api.slopepay.com
  tags:
  - Prescreens
  properties:
  - type: OpenAPI
    url: openapi/slope-prescreens-api-openapi.yml
  - type: APIReference
    url: https://developers.slopepay.com/reference
  - type: Documentation
    url: https://developers.slopepay.com/docs/getting-started
- aid: slope:slope-simulation-api
  name: Slope Simulation API
  description: The Simulation API from Slope — 7 operation(s) for simulation.
  humanURL: https://developers.slopepay.com/
  baseURL: https://api.slopepay.com
  tags:
  - Simulation
  properties:
  - type: OpenAPI
    url: openapi/slope-simulation-api-openapi.yml
  - type: APIReference
    url: https://developers.slopepay.com/reference
  - type: Documentation
    url: https://developers.slopepay.com/docs/getting-started
- aid: slope:slope-transactions-api
  name: Slope Transactions API
  description: The Transactions API from Slope — 1 operation(s) for transactions.
  humanURL: https://developers.slopepay.com/
  baseURL: https://api.slopepay.com
  tags:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/slope-transactions-api-openapi.yml
  - type: APIReference
    url: https://developers.slopepay.com/reference
  - type: Documentation
    url: https://developers.slopepay.com/docs/getting-started
- aid: slope:slope-user-links-api
  name: Slope User Links API
  description: The User Links API from Slope — 2 operation(s) for user links.
  humanURL: https://developers.slopepay.com/
  baseURL: https://api.slopepay.com
  tags:
  - User Links
  properties:
  - type: OpenAPI
    url: openapi/slope-user-links-api-openapi.yml
  - type: APIReference
    url: https://developers.slopepay.com/reference
  - type: Documentation
    url: https://developers.slopepay.com/docs/getting-started
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.slopepay.com/
- type: DeveloperPortal
  url: https://developers.slopepay.com/
- type: Documentation
  url: https://developers.slopepay.com/docs/getting-started
- type: APIReference
  url: https://developers.slopepay.com/reference
- type: GettingStarted
  url: https://developers.slopepay.com/docs/getting-started
- type: Support
  url: https://www.slopepay.com/contact#support
- type: Blog
  url: https://www.slopepay.com/blog
- type: Login
  url: https://dashboard.slopepay.com/
- type: TermsOfService
  url: https://www.slopepay.com/terms
- type: PrivacyPolicy
  url: https://www.slopepay.com/privacy
- type: StatusPage
  url: https://status.slopepay.com
- type: Deprecation
  url: https://developers.slopepay.com/docs/rfc-v4-api
- type: LLMsTxt
  url: llms/slope-llms.txt
- type: MCPServer
  url: mcp/slope-mcp.yml
- type: Overlay
  url: overlays/slope-v4-overlay.yaml
- type: Conformance
  url: conformance/slope-conformance.yml
- type: ErrorCatalog
  url: errors/slope-error-codes.yml
- type: Lifecycle
  url: lifecycle/slope-lifecycle.yml
- type: Sandbox
  url: sandbox/slope-sandbox.yml
- type: Conventions
  url: conventions/slope-conventions.yml
- type: Idempotency
  url: conventions/slope-conventions.yml
- type: RateLimits
  url: rate-limits/slope-rate-limits.yml
- type: ChangeLog
  url: changelog/slope-changelog.yml
- type: Components
  url: components/slope-components.yml
- type: DataModel
  url: data-model/slope-data-model.yml
- type: Webhooks
  url: asyncapi/slope-webhooks.yml
- type: AsyncAPI
  url: asyncapi/slope-events-asyncapi.yml
- type: Authentication
  url: authentication/slope-authentication.yml
- type: DomainSecurity
  url: security/slope-domain-security.yml
- type: AgenticAccess
  url: agentic-access/slope-agentic-access.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Arazzo
  name: Create a Slope order and finalize it
  url: arazzo/slope-create-order-and-finalize.yml
- type: Arazzo
  name: Refund a finalized Slope order
  url: arazzo/slope-refund-order.yml
- type: Arazzo
  name: Estimate and repay a Slope order
  url: arazzo/slope-repay-order.yml
- type: Arazzo
  name: Simulate an approved order in the sandbox
  url: arazzo/slope-sandbox-approve-order.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 28
  pass: local-v1