Outpost

Outpost is a Merchant of Record and Tax of Record platform for cross-border commerce, letting retailers sell into new markets while Outpost takes on the legal and tax liability — local payments, VAT/GST/sales-tax registration, calculation and filing, proforma invoicing for B2B bank transfers, and hosted merchant onboarding. Its server-to-server REST APIs (Tax of Record, Merchant of Record, and Hosted Onboarding) use OAuth2 client-credentials and JWT bearer authentication so merchants keep their own checkout and payment service providers (Stripe, Adyen) while Outpost handles compliance across jurisdictions. Founded by ex-Revolut operator Will Mahon-Heap and backed by Ribbit Capital and Better Tomorrow Ventures.

Outpost publishes 3 APIs on the APIs.io network. Tagged areas include Company, Merchant of Record, Tax of Record, Cross-Border Commerce, and Payments.

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

Outpost’s developer surface includes documentation, API reference, engineering blog, support, authentication, sandbox, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub
35.5/100 thin ▬ flat Agent 43/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
3 APIs 1 MCP Servers
CompanyMerchant of RecordTax of RecordCross-Border CommercePaymentsTax ComplianceE-CommerceVATFintechInvoicingOnboarding

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 35.5/100 · thin
Contract Quality 5.7 / 25
Developer Ergonomics 11.3 / 20
Commercial Clarity 4.2 / 20
Operational Transparency 1.0 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 43/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 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 0 / 7
Typed Event Surface 6 / 6
Agent Skills 0 / 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/outpost: 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 3

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

Outpost Tax of Record API

REST API that automates tax registration, calculation, and filing while the merchant keeps their own checkout and PSP. Server-to-server, OAuth2 client-credentials. Covers tax ca...

Outpost Merchant of Record API

REST API to issue proforma invoices for B2B customers paying by bank transfer, receive settlement webhooks, and retrieve tax invoices for payments and refunds processed through ...

Outpost Hosted Onboarding (Partner) API

Partner REST API to onboard existing merchants onto Outpost services with a hosted onboarding UI and asynchronous review workflow. JWT bearer auth, /partner/api prefix, staging ...

MCP Servers 1

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

outpost-mcp.yml

MCP SERVER

Event Specifications 1

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

Outpost Merchant Of Record Webhooks

ASYNCAPI

Security Posture 2

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

Outpost Authentication

oauth2/http · 2 schemes

SECURITY

Outpost Domain Security

TLSv1.2 · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 Sandbox
Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Idempotency
Idempotency
 ErrorCatalog
ErrorCatalog
 Webhooks
Webhooks
 Lifecycle
Lifecycle
 DataModel
DataModel
 Conformance
Conformance

Scroll for all 7

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support
Support

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

Source (apis.yml)

apis.yml Raw ↑ 
aid: outpost
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/outpost.png
name: Outpost
description: Outpost is a Merchant of Record and Tax of Record platform for cross-border commerce, letting retailers sell
  into new markets while Outpost takes on the legal and tax liability — local payments, VAT/GST/sales-tax registration, calculation
  and filing, proforma invoicing for B2B bank transfers, and hosted merchant onboarding. Its server-to-server REST APIs (Tax
  of Record, Merchant of Record, and Hosted Onboarding) use OAuth2 client-credentials and JWT bearer authentication so merchants
  keep their own checkout and payment service providers (Stripe, Adyen) while Outpost handles compliance across jurisdictions.
  Founded by ex-Revolut operator Will Mahon-Heap and backed by Ribbit Capital and Better Tomorrow Ventures.
url: https://raw.githubusercontent.com/api-evangelist/outpost/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- ribbit-capital
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Merchant of Record
- Tax of Record
- Cross-Border Commerce
- Payments
- Tax Compliance
- E-Commerce
- VAT
- Fintech
- Invoicing
- Onboarding
apis:
- name: Outpost Tax of Record API
  description: REST API that automates tax registration, calculation, and filing while the merchant keeps their own checkout
    and PSP. Server-to-server, OAuth2 client-credentials. Covers tax calculations, tax transactions, refunds, transaction
    invoices, and product-catalogue import (including Brazil NFS-e).
  humanURL: https://outpostnow.com/docs/api/tax-of-record/
  baseURL: https://api.outpostanywhere.com
  tags:
  - Tax of Record
  - Tax Calculation
  - Compliance
  properties:
  - type: Documentation
    url: https://outpostnow.com/docs/api/tax-of-record/
  - type: APIReference
    url: https://outpostnow.com/docs/api/tax-of-record/
- name: Outpost Merchant of Record API
  description: REST API to issue proforma invoices for B2B customers paying by bank transfer, receive settlement webhooks,
    and retrieve tax invoices for payments and refunds processed through Outpost. Server-to-server, OAuth2 client-credentials.
  humanURL: https://outpostnow.com/docs/api/merchant-of-record/
  baseURL: https://api.outpostanywhere.com
  tags:
  - Merchant of Record
  - Invoicing
  - Webhooks
  properties:
  - type: Documentation
    url: https://outpostnow.com/docs/api/merchant-of-record/
  - type: APIReference
    url: https://outpostnow.com/docs/api/merchant-of-record/
- name: Outpost Hosted Onboarding (Partner) API
  description: Partner REST API to onboard existing merchants onto Outpost services with a hosted onboarding UI and asynchronous
    review workflow. JWT bearer auth, /partner/api prefix, staging and production environments.
  humanURL: https://outpostnow.com/docs/api/hosted-onboarding/
  baseURL: https://partner.outpostanywhere.com
  tags:
  - Onboarding
  - Partner
  properties:
  - type: Documentation
    url: https://outpostnow.com/docs/api/hosted-onboarding/
  - type: APIReference
    url: https://outpostnow.com/docs/api/hosted-onboarding/
common:
- type: Website
  url: https://outpostnow.com
- type: DeveloperPortal
  url: https://outpostnow.com/docs/api/tax-of-record/
- type: Documentation
  url: https://outpostnow.com/docs/api/tax-of-record/
- type: APIReference
  url: https://outpostnow.com/docs/api/tax-of-record/
- type: Blog
  url: https://outpostnow.com/blog/
- type: Support
  url: https://outpostnow.com/faq/
- type: TermsOfService
  url: https://outpostnow.com/mor-terms/
- type: PrivacyPolicy
  url: https://outpostnow.com/privacy-policy/
- type: Authentication
  url: authentication/outpost-authentication.yml
- type: Conventions
  url: conventions/outpost-conventions.yml
- type: Idempotency
  url: conventions/outpost-conventions.yml
- type: ErrorCatalog
  url: errors/outpost-problem-types.yml
- type: Webhooks
  url: asyncapi/outpost-merchant-of-record-webhooks.yml
- type: Lifecycle
  url: lifecycle/outpost-lifecycle.yml
- type: Sandbox
  url: sandbox/outpost-sandbox.yml
- type: DataModel
  url: data-model/outpost-data-model.yml
- type: Conformance
  url: conformance/outpost-conformance.yml
- type: MCPServer
  url: mcp/outpost-mcp.yml
- type: LLMsTxt
  url: llms/outpost-llms.txt
- type: DomainSecurity
  url: security/outpost-domain-security.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 12
  pass: local-v1