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.
Kin Score
APIs 3
Individual APIs this provider publishes, each with its own machine-readable definition.
WorldFirst Enterprise Solution API
The WorldFirst Enterprise Solution (World Account) API — a RESTful, JSON, signed-request interface covering customer onboarding, account and beneficiary management, statements, ...
WorldFirst Pay Solution API
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...
WorldFirst WorldTrade Solution API
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...
Event Specifications 1
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Worldfirst Webhooks
ASYNCAPISecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Get Started 5
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 5
Pagination, idempotency, versioning, errors, and events
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API