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Programmatic access to payments, FX, hedging, and cash management.

Whether you’re embedding Alt21 in your product or automating your own FX workflows, the Alt21 API gives you real-time FX rates, payment execution, forward contracts, settlement data, and reporting, all via a single, well-documented API. 

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For internal teams

Automate your FX and payment workflows without manual steps.

Finance teams, ERP systems, and treasury platforms can connect directly to Alt21 via API automating FX conversions, payment execution, settlement reconciliation, and exposure reporting without any manual intervention.

  • Trigger FX conversions and payments programmatically

    Set rules, thresholds, or schedules in your own system. Alt21 executes automatically. No platform login required.

  • Pull real-time rates, positions, and settlement data into your own reporting

    Live FX rates, open position data, and settlement confirmations available via API, so your dashboards and reports stay current without manual updates.

  • Reconcile automatically with your accounting software

    Settlement data posts directly to your ERP or accounting package. Every FX trade and payment reconciled without manual journal entries.

Integrate Alt21 into your business
for developers

A well-documented API built for production.

REST API with webhook support. Real-time and historical FX data. OAuth2 and HMAC authentication. Sandbox environment that mirrors production.

  • Real-time FX rates and order book data via streaming API

    Sub-second latency. Covers spot rates, forward points, and mid-market rates across all supported currency pairs.

  • Historical FX data and transaction history, exportable and queryable

    Access full historical rate data and your own transaction history for reconciliation, reporting, and analysis.

  • Payment execution, FX conversion, and forward contract APIs all production-ready

    Execute spot conversions, initiate payments, book forward contracts, and retrieve settlement confirmations programmatically. Webhook notifications for every state change.

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API

How to get started

01
Create a Sandbox account

The sandbox mirrors the production environment exactly. Test payment flows, FX conversions, forward contract bookings, and webhook events before a single line of production code is written.

02
Explore the documentation

Full endpoint reference, authentication guides, code examples in multiple languages, and webhook event schemas. Everything you need to build confidently.

03
Go live

Generate production API keys, complete any required compliance steps, and start executing. Our integrations team is available throughout.

why choose Alt21?

Built for production. Regulated for trust.

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Production-grade infrastructure, built for scale.

The Alt21 API is built on the same infrastructure that processes institutional FX volume. Designed for straight-through processing, high availability, and low latency, not retrofitted for API access after the fact.

FCA and MFSA regulated, your integration inherits the compliance.

Alt21 is the authorised entity for all transactions. Your integration accesses regulated financial services without your product becoming a regulated entity.

OAuth2, HMAC, HTTPS/WSS, security built into the API design.

Every request authenticated. All data in transit encrypted. Webhook signatures verified. Enterprise authentication options available for high-security environments.

faqs

Everything you need to know about how Alt21 works.

The Alt21 API gives you programmatic access to payments, FX, hedging, and cash management. The full platform, in your hands.

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