WorldFirst

WorldFirst is a United Kingdom-founded cross-border payments and money-movement company, headquartered in London and owned by Ant Group (Alipay) since 2019. It gives online sellers, marketplaces, and SMEs a multi-currency World Account to collect, hold, convert, and send money across borders, alongside a World Card for multi-currency spending and marketplace/supplier payouts. Its home market is the United Kingdom, but its book is global e-commerce and cross-border trade, serving merchants selling on Amazon and other marketplaces. WorldFirst ships a genuine, API-native developer platform at developers.worldfirst.com built on Ant Group's Antom-style gateway (open-sea/open-eu/open-na hosts, /amsin/api/v1 paths): a RESTful, JSON, HTTPS-only interface segmented into an Enterprise Solution (account, beneficiary, FX, transfer, payout, invoicing, virtual-card credit), a Pay Solution (Cashier Payment / online checkout acceptance for merchants), and a WorldTrade Solution (cross-border trade orders). Requests are secured with RSA256/ECC224 digital signatures plus OAuth 2.0 access tokens; asynchronous notifications (webhooks) return payment and trade-order results. The public reference is documentation-and-console only — the underlying OpenAPI/Swagger is not offered as a downloadable spec (the gateway blocks anonymous spec fetches), so integration is gated behind partner onboarding and the console's iMock/iTest tooling.

WorldFirst publishes 3 APIs on the APIs.io network. Tagged areas include Payments, United Kingdom, Cross-Border, Money Transfer, and Foreign Exchange.

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

WorldFirst’s developer surface includes documentation, API reference, getting-started guide, pricing, engineering blog, signup flow, authentication, and 15 more developer resources.

🌐 Visit website 📡 Source on GitHub

41.5/100 developing ▬ flat Agent 33/100 agent aware Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

3 APIs

Payments United Kingdom Cross-Border Money Transfer Foreign Exchange Payouts Payment Gateway E-Commerce Multi-Currency Card Issuing

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 41.5/100 · developing

Contract Quality 9.6 / 21

Developer Ergonomics 10.1 / 17

Access Clarity 6.5 / 17

Operational Transparency 0.9 / 11

Contract Governance 0.5 / 10

Discoverability 6.9 / 9

Regulatory Posture 5.9 / 15

Agent readiness — 33/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 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

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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/. This rating is computed from github.com/api-evangelist/worldfirst: 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.

Get Started 5

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Sandbox

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Webhooks

Lifecycle

Conformance

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

HelpCenter

HelpCenter

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

Source (apis.yml)

aid: worldfirst
url: https://raw.githubusercontent.com/api-evangelist/worldfirst/refs/heads/main/apis.yml
name: WorldFirst
kind: company
description: 'WorldFirst is a United Kingdom-founded cross-border payments and money-movement company, headquartered in London
  and owned by Ant Group (Alipay) since 2019. It gives online sellers, marketplaces, and SMEs a multi-currency World Account
  to collect, hold, convert, and send money across borders, alongside a World Card for multi-currency spending and marketplace/supplier
  payouts. Its home market is the United Kingdom, but its book is global e-commerce and cross-border trade, serving merchants
  selling on Amazon and other marketplaces. WorldFirst ships a genuine, API-native developer platform at developers.worldfirst.com
  built on Ant Group''s Antom-style gateway (open-sea/open-eu/open-na hosts, /amsin/api/v1 paths): a RESTful, JSON, HTTPS-only
  interface segmented into an Enterprise Solution (account, beneficiary, FX, transfer, payout, invoicing, virtual-card credit),
  a Pay Solution (Cashier Payment / online checkout acceptance for merchants), and a WorldTrade Solution (cross-border trade
  orders). Requests are secured with RSA256/ECC224 digital signatures plus OAuth 2.0 access tokens; asynchronous notifications
  (webhooks) return payment and trade-order results. The public reference is documentation-and-console only — the underlying
  OpenAPI/Swagger is not offered as a downloadable spec (the gateway blocks anonymous spec fetches), so integration is gated
  behind partner onboarding and the console''s iMock/iTest tooling.'
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Payments
- United Kingdom
- Cross-Border
- Money Transfer
- Foreign Exchange
- Payouts
- Payment Gateway
- E-Commerce
- Multi-Currency
- Card Issuing
tags_raw:
- Payments
- United Kingdom
- Cross-Border
- Money Transfer
- Foreign Exchange
- Payouts
- Payment Gateway
- E-commerce
- Multi-Currency
- Card Issuing
created: '2026-07-24'
modified: '2026-07-24'
specificationVersion: '0.23'
apis:
- aid: worldfirst:worldfirst-enterprise-solution-api
  name: WorldFirst Enterprise Solution API
  description: The WorldFirst Enterprise Solution (World Account) API — a RESTful, JSON, signed-request interface covering
    customer onboarding, account and beneficiary management, statements, foreign exchange, transfer, payout, invoicing, and
    virtual-card (VC) credit for globally based partners and customers. Requests are signed with RSA256/ECC224 and carry an
    OAuth 2.0 Access-Token; no downloadable OpenAPI is published.
  humanURL: https://developers.worldfirst.com.cn/docs/alipay-worldfirst/worldfirst_enterprise_solution/api_overview
  baseURL: https://open-sea.worldfirst.com/amsin/api/v1
  tags:
  - Enterprise
  - World Account
  - Foreign Exchange
  - Payouts
  - Cross-Border
  properties:
  - type: Documentation
    url: https://developers.worldfirst.com.cn/docs/alipay-worldfirst/worldfirst_enterprise_solution/getting_started
  - type: APIReference
    url: https://developers.worldfirst.com.cn/docs/alipay-worldfirst/worldfirst_enterprise_solution/api_overview
- aid: worldfirst:worldfirst-pay-solution-api
  name: WorldFirst Pay Solution API
  description: 'The WorldFirst Pay Solution (Cashier Payment) API lets overseas e-commerce merchants accept payments through
    a hosted checkout: create a payment order, let the customer complete payment, inquire about payment status, and receive
    an asynchronous payment notification (webhook). RESTful JSON over HTTPS with RSA256/ECC224 signed requests; no downloadable
    OpenAPI is published.'
  humanURL: https://developers.worldfirst.com/docs/alipay-worldfirst/cashier_payment/getting_started
  baseURL: https://open-sea.worldfirst.com/amsin/api/v1
  tags:
  - Payment Acceptance
  - Cashier Payment
  - Checkout
  - E-Commerce
  tags_raw:
  - Payment Acceptance
  - Cashier Payment
  - Checkout
  - E-commerce
  properties:
  - type: Documentation
    url: https://developers.worldfirst.com/docs/alipay-worldfirst/cashier_payment/development_via_api
  - type: APIReference
    url: https://developers.worldfirst.com/docs/alipay-worldfirst/cashier_payment/getting_started
- aid: worldfirst:worldfirst-worldtrade-solution-api
  name: WorldFirst WorldTrade Solution API
  description: The WorldTrade Solution API supports cross-border trade transactions between partners and the WorldFirst platform
    — e.g. inquiryQuotes (FX quote lookup at /amsin/api/v1/payments/inquiryQuotes), createTradeOrder to submit a trade order,
    and a WorldFirst-initiated notifyTradeOrderCloseResult asynchronous callback. RESTful JSON over HTTPS with RSA256/ECC224
    signed requests; no downloadable OpenAPI is published.
  humanURL: https://developers.worldfirst.com/docs/alipay-worldfirst/worldtrade_solution/overview
  baseURL: https://open-sea.worldfirst.com/amsin/api/v1
  tags:
  - Cross-Border
  - Trade
  - Foreign Exchange
  - Webhook
  tags_raw:
  - Cross-Border
  - Trade
  - Foreign Exchange
  - Webhooks
  properties:
  - type: Documentation
    url: https://developers.worldfirst.com/docs/alipay-worldfirst/worldtrade_solution/overview
  - type: APIReference
    url: https://developers.worldfirst.com/docs/alipay-worldfirst/overview/apis
common:
- type: DomainSecurity
  url: security/worldfirst-domain-security.yml
- type: Website
  url: https://www.worldfirst.com/
- type: DeveloperPortal
  url: https://developers.worldfirst.com/
- type: Documentation
  url: https://developers.worldfirst.com/docs/alipay-worldfirst/overview/home
- type: APIReference
  url: https://developers.worldfirst.com/docs/alipay-worldfirst/overview/apis
- type: GettingStarted
  url: https://developers.worldfirst.com/docs/alipay-worldfirst/cashier_payment/getting_started
- type: Pricing
  url: https://www.worldfirst.com/uk/pricing/
- type: Blog
  url: https://www.worldfirst.com/uk/blog/
- type: TermsOfService
  url: https://www.worldfirst.com/uk/terms-and-conditions/
- type: PrivacyPolicy
  url: https://www.worldfirst.com/uk/privacy-policy/
- type: LinkedIn
  url: https://www.linkedin.com/company/world-first
- type: SignUp
  url: https://portal.worldfirst.com/register?lang=en-GB&region=global
- type: Login
  url: https://portal.worldfirst.com/login?lang=en-GB&region=global
- type: HelpCenter
  url: https://www.worldfirst.com/help-center/
- type: LLMsTxt
  url: llms/worldfirst-llms.txt
- type: Authentication
  url: authentication/worldfirst-authentication.yml
- type: Conventions
  url: conventions/worldfirst-conventions.yml
- type: ErrorCatalog
  url: errors/worldfirst-problem-types.yml
- type: Webhooks
  url: asyncapi/worldfirst-webhooks.yml
- type: Sandbox
  url: sandbox/worldfirst-sandbox.yml
- type: Lifecycle
  url: lifecycle/worldfirst-lifecycle.yml
- type: Conformance
  url: conformance/worldfirst-conformance.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

WorldFirst

Kin Score

APIs 3

WorldFirst Enterprise Solution API

WorldFirst Pay Solution API

WorldFirst WorldTrade Solution API

Event Specifications 1

Worldfirst Webhooks

Security Posture 2

Worldfirst Authentication

Worldfirst Domain Security

Resources