I need a currency conversion API that provides mid-market rates and historical data for accounting.
Data as of Sep 21, 2026 · Based on 297 AI responses from ChatGPT Search and Google AI Mode · See how Parse measures this
Data as of Sep 21, 2026 · Based on 297 AI responses from ChatGPT Search and Google AI Mode · See how Parse measures this
For accounting needs requiring mid-market rates and historical data, 
Brands AI recommends here
Named in 54% of answers
Ideal for accounting teams needing reliable mid-market data from trusted sources. It supports 170+ currencies with updates every 60 seconds and historical data back to 1999, making it suitable for both businesses and developers.
Named in 40% of answers
Highly recommended for teams prioritizing ease of implementation. It offers reliable live and historical data for over 160 currencies, well-suited for automating accounting workflows, invoices, and financial systems.
Named in 37% of answers
Named in 35% of answers
Source | Citation share |
|---|---|
Fixer API - Foreign Exchange Rates & Currency Conversion APIhttps://fixer.io/ | 4% |
 Real-Time and Historical Currency Data with Exchange Rates APIhttps://exchangeratesapi.io/ | 4% |
 Foreign Exchange Rates (FOREX) API - Oandahttps://www.oanda.com/foreign-exchange-data-services/en/exchange-rates-api/ | 3% |
ExchangeRate-API - Free & Pro Currency Converter APIhttps://www.exchangerate-api.com/ | 2% |
 10 Best Currency Exchange API Options for Developers in 2026https://currencyfreaks.com/blog/10-Best-Currency-Exchange-API.html | 2% |
 CurrencyBeacon - REST Currency API, Code Samples, and MCP Server - CurrencyBeaconhttps://www.currencybeacon.com/ | 2% |
 Convert with Exchange Rate API - Parabolahttps://parabola.io/product/integration/exchange-rate | 2% |
ExchangeRate-API - Historical Data Request Type Documentationhttps://www.exchangerate-api.com/docs/historical-data-requests | 2% |
Exchange Rates Data API - APILayerhttps://marketplace.apilayer.com/exchangerates_data-api | 2% |
How To Choose The Best Currency API Without Costly Mistakeshttps://ibrlive.com/how-to-choose-the-best-currency-api/ | 2% |
For accounting, I’d look for four things: **mid-market methodology, point-in-time historical rates, reliable timestamps, and an audit-friendly API response**. Here are the strongest options I found: API | Mid-market | Historical data | Accounting fit
For accounting, I’d look for four things: mid-market methodology, point-in-time historical rates, reliable timestamps, and an audit-friendly API response.
Here are the strongest options I found:
| API | Mid-market | Historical data | Accounting fit |
|---|---|---|---|
| Currencylayer | Yes — says its rates generally represent the midpoint of the forex market | Daily history back to 1999; date and time-range endpoints | Strong |
| Wise Platform | Yes, based on Wise's exchange-rate data | Historical timestamps plus daily/hourly/minute history | Strong, but access is more restricted |
| ExchangeRates.com | Yes | Daily history up to 365 days | Good for simpler/low-cost needs |
| XE Currency Data API | Yes | Historical rates | Strong established FX provider |
Currencylayer is probably the easiest fit if you need a conventional REST API for an accounting system. Its documentation explicitly describes its rates as generally the market midpoint, and it provides historical rates dating back to 1999, including a specific-date endpoint and time-frame queries. Paid plans currently start at $14.99/month for 10,000 requests.
Wise Platform is particularly interesting if you need more granular historical data: its rates API supports a specific historical timestamp as well as daily, hourly, and minute-level history. However, API access depends on the applicable Wise Platform/partner arrangement, so it's less straightforward to self-serve than Currencylayer.
For accounting, I'd also store the source, rate timestamp/date, base currency, quote currency, and raw API response alongside each converted transaction. That gives you a reproducible audit trail rather than relying on whatever the provider returns today.
If you tell me your volume (e.g. 1k vs. 1M transactions/month), required currencies, and whether you need daily closing rates or transaction-time rates, I can narrow this to the best 2–3 APIs and compare pricing, SLA, historical depth, and API examples.
For accounting, auditing, and financial reporting, choosing the right currency API is critical . You need a provider that supplies reliable mid-market rates (or official central bank/custom fixings) alongside deep historical records to satisfy tax authorities and…
For accounting, auditing, and financial reporting, choosing the right currency API is critical . You need a provider that supplies reliable mid-market rates (or official central bank/custom fixings) alongside deep historical records to satisfy tax authorities and auditors.
The top currency conversion API providers tailored for accounting and financial tracking include:
To help narrow down the ideal choice, let me know:
For accounting, I’d focus on **rate provenance, historical reproducibility, and whether “mid-market” is explicitly defined**, rather than just conversion speed. ### Good options - **[frankfurter.dev](https://frankfurter.dev/?utm_source=chatgpt.com)** — Particularly attractive for accounting workflows. It provides…
For accounting, I’d focus on rate provenance, historical reproducibility, and whether “mid-market” is explicitly defined, rather than just conversion speed.
For a typical AP/AR, ERP, tax, or financial-reporting system, I would start with Frankfurter if its supported currencies and data-source requirements fit your jurisdiction. Its ability to pin an official provider is particularly useful when accounting or tax rules require a specific central-bank/reference rate rather than a generic market rate.
One important accounting detail: don't store only the converted amount. Store the original amount/currency, converted amount/currency, rate, rate date/time, and rate source/provider. For historical transactions, persist the rate you actually used so later API changes don't alter your books.
If you tell me your country, currencies, approximate API volume, and whether this is GAAP/IFRS/tax reporting, I can narrow this to 2–3 APIs and compare pricing, historical depth, rate-source methodology, SLA, and API limits.
For accounting systems, tracking accurate **mid-market rates** (the midpoint between buy and sell prices) and reliable **historical end-of-day (EOD) rates** is critical for accurate ledger entries, multi-currency invoicing, and financial consolidation.[](https://openexchangerates.org/faq)…
For accounting systems, tracking accurate mid-market rates (the midpoint between buy and sell prices) and reliable historical end-of-day (EOD) rates is critical for accurate ledger entries, multi-currency invoicing, and financial consolidation.
Top currency conversion APIs well-suited for accounting requirements include:
To help narrow down the right option, could you share:
For accounting, I’d prioritize **historical reproducibility, an explicit rate source, and clear documentation of whether the rate is truly mid-market**. ### Best options API | Mid-market | Historical data | Accounting fit | My take
For accounting, I’d prioritize historical reproducibility, an explicit rate source, and clear documentation of whether the rate is truly mid-market.
| API | Mid-market | Historical data | Accounting fit | My take |
|---|---|---|---|---|
| xecdapi.xe.com | Yes | Yes, daily historical periods | ⭐⭐⭐⭐⭐ | Best if you need a commercial/vendor-grade source |
| fixer.io | Yes | Yes, back to 1999 for most currencies | ⭐⭐⭐⭐ | Good general-purpose commercial API |
| frankfurter.dev | Not strictly “mid-market” | Excellent; 1948–present depending on provider | ⭐⭐⭐⭐ | Excellent if official central-bank/reference rates work for your accounting policy |
| currencylayer.com | Forex/bank sourced | Yes, 16+ years | ⭐⭐⭐ | Solid, but I’d favor XE/Fixer for accounting |
XE explicitly describes its rates as mid-market rates, and its API supports daily historical rates over a period.
Fixer also explicitly states that its data is midpoint data—the average/median of bid and ask—and provides EOD historical rates, with history going back to 1999.
Frankfurter is particularly interesting for accounting because you can pin the data to an official provider rather than relying on a blended rate. It supports providers such as the ECB, U.S. Treasury, and other central banks, plus historical dates and time series.
If your accounting policy specifically says “mid-market FX rate”, I'd start with XE.
If your policy instead specifies something like ECB reference rates, U.S. Treasury rates, or another central-bank published rate, I'd choose Frankfurter with a pinned provider. That's potentially more defensible for audit purposes because you can record exactly which official source supplied the rate.
For an accounting system, I would also store these fields alongside every conversion:
That gives you an auditable FX trail rather than merely storing the converted dollar amount.
If you tell me your currencies, transaction volume, and whether this is GAAP/IFRS/tax reporting, I can narrow this down to the best 2–3 APIs and compare pricing, SLA, historical depth, rate methodology, and accounting/audit suitability.
Frankfurter is particularly interesting for accounting because you can pin the data to an official provider rather than relying on a blended rate. It supports providers such as the ECB, U.S. Treasury, and other central banks, plus historical dates and time series.
If your accounting policy specifically says “mid-market FX rate”, I'd start with XE.
If your policy instead specifies something like ECB reference rates, U.S. Treasury rates, or another central-bank published rate, I'd choose Frankfurter with a pinned provider. That's potentially more defensible for audit purposes because you can record exactly which official source supplied the rate.
For an accounting system, I would also store these fields alongside every conversion:
For accounting use cases, you need high accuracy, reliable mid-market data (often sourced from central banks or global financial liquidity providers), and deep historical archives for audits and reconciliation.[](https://allratestoday.com/blog/best-free-currency-exchange-api-2026/)…
For accounting use cases, you need high accuracy, reliable mid-market data (often sourced from central banks or global financial liquidity providers), and deep historical archives for audits and reconciliation.
Here are the top currency conversion APIs well-suited for accounting and financial data:
To help narrow down the best fit, let me know:
If this is for **accounting, month-end close, FX revaluation, or audit trails**, I’d prioritize an API that gives you both **mid-market rates and deterministic historical lookups**, not just a real-time converter. ### Best fits - **[currencybeacon.com](https://www.currencybeacon.com/?utm_source=chatgpt.com) — my top…
If this is for accounting, month-end close, FX revaluation, or audit trails, I’d prioritize an API that gives you both mid-market rates and deterministic historical lookups, not just a real-time converter.
For a production accounting system, I'd start with CurrencyBeacon because its feature set maps unusually well to accounting: historical date lookup, time series, mid-market rates, and explicit support for reconciliation/revaluation workflows.
If you tell me your monthly request volume, currencies, and whether you need GAAP/IFRS month-end rates or transaction-date rates, I can narrow this to the best 2–3 APIs and compare pricing, historical depth, rate source, SLA, and auditability.
If this is for **accounting**, I’d prioritize an API that explicitly provides **midpoint/mid-market rates**, reliable historical snapshots, and an auditable date/timestamp. ### Best fit: Fixer Fixer is probably the simplest match.
If this is for accounting, I’d prioritize an API that explicitly provides midpoint/mid-market rates, reliable historical snapshots, and an auditable date/timestamp.
Fixer is probably the simplest match.
Currencylayer also explicitly describes its rates as representative midpoint market rates and specifically mentions accounting/invoicing use cases.
Its historical data goes back to 1999, and it offers historical conversions and time-frame queries. GitHub Currencylayer Pricing currently starts around $14.99/month for 10,000 requests.
| Requirement | Fixer | Currencylayer |
|---|---|---|
| Mid-market/midpoint | Yes | Yes |
| Historical rates | 1999–present | 1999–present |
| Daily historical data | Yes | Yes |
| Date-range queries | Yes | Yes |
| Historical conversion | Yes | Yes |
| Accounting use case | Very good | Very good |
| Starting paid price | ~$14.99/mo | ~$14.99/mo |
For an accounting system, I'd lean Fixer because its API exposes the historical-date and timeseries functionality cleanly and explicitly documents its midpoint methodology.
One important accounting consideration: don't just store the converted amount. Store source currency, target currency, rate, rate date, rate source/provider, and API retrieval timestamp alongside each transaction. That gives you a much better audit trail when rates are revisited during a close or audit.
If you tell me your stack (Python, Node, .NET, Java, PHP, etc.) and whether you need GAAP/IFRS month-end rates, daily transaction rates, or both, I can narrow this down to the best API and show the exact integration pattern.
For accounting and financial reporting, you need an API that not only provides accurate mid-market or central bank rates but also maintains reliable historical archives to satisfy compliance, tax, and auditing standards.[](https://www.oanda.com/foreign-exchange-data-services/en/exchange-rates-api/)…
For accounting and financial reporting, you need an API that not only provides accurate mid-market or central bank rates but also maintains reliable historical archives to satisfy compliance, tax, and auditing standards.
Top currency conversion APIs suited for accounting workflows include:
If you can share:
I can help you narrow down the best fit and pricing tier.
For accounting, audit-readiness, and financial compliance, you need an API that provides reliable mid-market rates (interbank rates), deep historical archives (often going back decades), and consistent daily/monthly closing fixes (bid/ask/midpoints). Top currency conversion API providers well-suited for accounting and…
For accounting, audit-readiness, and financial compliance, you need an API that provides reliable mid-market rates (interbank rates), deep historical archives (often going back decades), and consistent daily/monthly closing fixes (bid/ask/midpoints).
Top currency conversion API providers well-suited for accounting and financial tracking include:
To help narrow down the best fit, let me know:
