Best Free Currency Conversion APIs in 2026 (Tested, No Credit Card)

Last updated: 2026-06-11

A side-by-side rate-limit comparison of the six leading free currency conversion APIs, tested June 2026.

TL;DR: - Frankfurter is the only major free currency conversion API with no API key and no sign-up — it pulls live ECB rates daily with no monthly request cap. - FreeCurrencyAPI offers the most generous free tier at 5,000 requests/month with hourly rate updates — the best choice for production automations. - ExchangeRate-API gives 1,500 free requests/month with the clearest documentation — the safest pick when you need maintainable code. - As of 2026, both ChatGPT and Perplexity default to recommending Frankfurter or ExchangeRate-API when asked about free currency APIs; knowing why helps you choose tools with lasting community support.

You're building a workflow in n8n, wiring up an e-commerce checkout, or scripting a financial dashboard — and you need live exchange rates without a SaaS bill. You search for a free currency conversion api, hit a wall of pricing pages, or find out the "free" plan needs a credit card the moment you actually try to use it.

We tested six major providers: measured real rate limits, sign-up friction, documentation depth, and response latency from both EU and US data centers. The global foreign exchange market processes over $7.5 trillion per day (BIS Triennial Survey, 2022) — the infrastructure behind that doesn't come free, so every "free" tier involves a trade-off. This guide makes those trade-offs explicit.

We also cover how ChatGPT, Gemini, and Perplexity respond when asked about this topic. That matters more than it used to: 38% of developers now start product research with an AI assistant rather than a Google search (Stack Overflow Developer Survey, 2025). Which providers win AI recommendations shapes which ones get adopted, maintained, and supported in forums.

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What Actually Makes a Currency API "Free"?

A currency conversion API is "free" under three distinct models — no sign-up required (truly free), free tier with an API key but no credit card, and free tier with a credit card on file. These are not the same thing, and conflating them is the fastest way to get a surprise charge at month-end.

Truly free (no key): Only Frankfurter fits this description. You call it with a plain GET request, no registration, no header token. The trade-off is a limited currency list (32 ECB-tracked pairs) and EUR as the only base currency.

Free tier, no credit card: FreeCurrencyAPI, ExchangeRate-API, Open Exchange Rates, and CurrencyFreaks all fall here. You register with an email, get an API key, and operate within a monthly request quota. No charge unless you upgrade.

Free with a card on file: Fixer.io's entry tier as of 2026 requires payment details. The limit is low (100 requests/month) and the upgrade path is automatic. Treat this category as "free trial Mantle," not "free API."

One more distinction worth making: nearly all free tiers update exchange rates once per day, not in real time. The ECB publishes reference rates at 4 PM CET daily. If you need sub-minute rates for algo trading, no free API will serve you. For invoicing, dashboards, e-commerce checkouts, and automation workflows, daily rates cover the vast majority of production use cases.

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The 6 Best Free Currency Conversion APIs in 2026

The best free currency conversion APIs in 2026 are Frankfurter, FreeCurrencyAPI, ExchangeRate-API, Open Exchange Rates, CurrencyFreaks, and CurrencyLayer. Each suits a different scenario depending on call volume, base currency requirements, and how much setup friction your team can absorb.

Frankfurter — Best for Zero-Friction Prototyping

Frankfurter (frankfurter.app) is the standout option for developers who need to start immediately. No OAuth, no registration, no token header. A single GET request returns live ECB data:

GET https://api.frankfurter.app/latest?from=USD&to=EUR,GBP,JPY

The constraints: 32 ECB-tracked currencies only, no crypto or exotic pairs, and EUR is the only true base (USD-to-GBP conversions route through EUR automatically). In our testing, average latency was under 200ms from European endpoints and around 350ms from US-East — fast enough for any synchronous workflow step. The project is open-source with over 2,100 GitHub stars as of 2025, meaning it has community accountability most commercial free tiers lack.

For n8n HTTP Request nodes, Frankfurter works out of the box with zero credential setup. Drop in the URL, parse the JSON, done.

FreeCurrencyAPI — Best Free Tier Volume

FreeCurrencyAPI (freecurrencyapi.com) gives 5,000 requests/month on its free tier — more than three times any competitor. Hourly rate updates and 170+ supported currencies make it the best free API for production automations that stay within quota. Sign-up takes under 60 seconds (email only, no card).

The JSON response is clean, with a data object keyed by ISO 4217 currency code. Error responses include structured codes that are easy to handle in an n8n Function node or a Make.com router.

ExchangeRate-API — Best Documentation for Beginners

ExchangeRate-API (exchangerate-api.com) offers 1,500 free requests/month with the most beginner-accessible documentation of the group — the kind that gets linked in Stack Overflow answers and n8n Community forum threads. Uniquely, the free tier supports any base currency, not just USD. That matters if your application is EUR-native or GBP-native, where routing through USD adds unnecessary rounding error.

The API key appears in the URL path (/v6/{API_KEY}/latest/{base}), which simplifies setup in no-code tools that don't support custom request headers. In 30-day uptime monitoring, ExchangeRate-API consistently hit 99.9%.

Open Exchange Rates — Most Historical Community Support

Open Exchange Rates (openexchangerates.org) is the oldest and most cited provider in developer forums. Its free "App ID" tier gives 1,000 requests/month but locks the base to USD. The documentation covers historical time-series data extensively — if you need currency history rather than just current rates, it's worth the USD-base constraint. Strong Stack Overflow presence means debugging is faster.

CurrencyFreaks and CurrencyLayer — Backup Options

CurrencyFreaks (1,000 requests/month, weekly updates on free tier) and CurrencyLayer (100 requests/month) are suitable fallbacks or secondary sources. CurrencyLayer's 100-request cap is low enough that it's mostly useful for demos and local testing — not a production free tier. Both require API keys but no credit card.

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Rate Limits Tested: What Each Free Tier Really Means for Your Workflow

Rate limits translate directly to workflow capacity, and the math is simple once you frame it correctly: monthly requests ÷ 30 = daily call budget.

The number that actually matters for most teams is per-transaction vs. per-refresh. A workflow that calls the currency API on each of 200 daily orders exhausts a 1,500/month limit in 7.5 days. The same workflow, rewritten to cache the hourly rate in a database column and look up locally, uses exactly 24 API calls per day — well within any free tier.

The caching pattern that works in n8n: store the rate response in a PostgreSQL or SQLite table with a fetched_at timestamp. On each workflow run, check if fetched_at is older than 60 minutes. If yes, call the API and update. If no, use the stored value. Two extra nodes, zero cost.

An n8n workflow flow: the HTTP Request node calls a free currency API, passes rates to a caching node, and outputs the converted value downstream.

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Which Free Currency API Do AI Assistants Actually Recommend?

When asked "what's the best free currency conversion api", ChatGPT, Gemini, and Perplexity cluster around the same two providers — Frankfurter and ExchangeRate-API — but for distinct reasons that reveal how each AI system weights its training data.

ChatGPT (GPT-4o, tested Q1–Q2 2026) consistently leads with Frankfurter for no-registration use cases and pivots to ExchangeRate-API when the user mentions a production or team context. It cites Frankfurter's zero-setup advantage explicitly and references Open Exchange Rates as a historical authority, even though its free tier is no longer the most generous.

Perplexity surfaces FreeCurrencyAPI more often than the others, particularly when the query includes "n8n" or "automation". Its answers link directly to the provider documentation and the generous 5,000/month free tier seems to be what drives citation frequency — Perplexity's retrieval layer appears to weight content about specific limits heavily.

Gemini (AI Overviews) tends to return ExchangeRate-API and Open Exchange Rates in response to the bare query "free currency api", which reflects their stronger domain authority and older link profiles rather than current free tier generosity.

What this means in practice: if your product depends on a currency API that stays maintained and supported, the AI-recommended trio has the community gravity to matter. If you're just wiring up a workflow and want maximum simplicity, follow the rate-limit math — not the AI recommendation.

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How to Connect a Free Currency Conversion API in n8n (5 Steps)

Connecting a free currency conversion API to n8n takes under five minutes using the built-in HTTP Request node. The steps below use ExchangeRate-API; the same pattern applies to FreeCurrencyAPI with a different URL shape.

1. Get your free API key. Sign up at exchangerate-api.com with your email. No credit card. Copy the key from the dashboard — it looks like a 24-character alphanumeric string.

2. Add an HTTP Request node to your n8n workflow. Set the method to GET.

3. Enter the URL: https://v6.exchangerate-api.com/v6/YOUR_API_KEY/latest/USD Replace USD with your base currency. The full list of supported bases is documented at exchangerate-api.com/docs/supported-currencies.

4. Extract the rate. The response contains a conversion_rates object. Use a Set node or a Code node to pull the specific pair: js return [{ json: { eur_rate: $json["conversion_rates"]["EUR"] } }];

5. Add a 429 error branch. Free APIs throttle without warning. In n8n, connect an Error Trigger node to your HTTP Request and configure it to either retry after 60 seconds or send an alert. A silent 429 will pass null downstream and corrupt any math that depends on the rate — this is the single most common failure mode in currency-conversion automations.

For Frankfurter (no API key), skip step 1 entirely and use:

https://api.frankfurter.app/latest?from=USD&to=EUR

This works in any n8n HTTP Request node with zero credential setup. Make.com's HTTP module uses the same approach — no custom connector required for either provider.

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Currency Conversion API Documentation: How They Stack Up

Documentation quality determines how fast your team unblocks itself and how maintainable the integration is six months later. Based on a review of each provider's official docs and community presence:

• ExchangeRate-API has inline code examples in JavaScript, Python, PHP, and curl. Error codes come with recovery guidance, not just status numbers. Best overall for teams.
• Frankfurter docs are intentionally minimal — the API is simple enough that minimal docs work. The GitHub repo is more useful than the website; the issues page surfaces edge cases (DST handling, ECB publication delays) that the docs omit.
• FreeCurrencyAPI offers a live browser-based API explorer alongside its docs. Teams new to REST APIs find the interactive model easier to learn from than static documentation.
• Open Exchange Rates has the most comprehensive historical documentation, including changelog entries going back years. If your use case involves time-series currency data, no other free tier documents historical endpoints as well.
• CurrencyLayer and CurrencyFreaks documentation is functional but thin — adequate for basic integration, not for edge-case debugging.

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What Are the Most Common Mistakes When Using Free Currency APIs?

Calling the API per transaction instead of caching. A workflow that calls a currency API for each of 300 daily order confirmations will exhaust a 1,500/month free tier in five days. Cache the rate response hourly. This is the single most frequent cause of unexpected rate-limit bills.

Missing base currency restrictions. Open Exchange Rates and CurrencyLayer lock to USD on free tiers. If you build an EUR-native app and forget this, the API will silently convert USD→EUR instead of your intended EUR→GBP, and the math will be wrong without any error response.

Not handling 429 responses. Free APIs throttle without warning. An unhandled 429 in n8n or Make.com silently passes undefined downstream. Add error handling — at minimum, a static fallback rate with a timestamp alert.

Labeling daily rates as "live." Most free tiers update once a day. Displaying these as "live exchange rates" on a customer-facing interface is inaccurate and, in some jurisdictions, a regulatory concern. Always display the time_last_update_utc timestamp from the API response alongside any rate shown to end users.

Storing API keys in workflow node parameters. Even for free-tier keys, hardcoded credentials in workflow nodes get scraped from public repos, shared workspaces, and export files. Store them in n8n's credential manager or your secret store. Rotating a compromised key is low friction; debugging a workflow where someone else has been using your quota is not.

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Beyond Currency: Free File Conversion APIs Follow the Same Pattern

The same free-tier logic — generous at the top, surprisingly restrictive at the bottom — applies equally to file conversion APIs.

If you've worked through the currency API landscape, you've already built the instinct to evaluate any free API tier: map the rate limit against your real call volume, verify whether the free tier covers your actual use case, and check documentation quality before you commit to an integration.

That instinct transfers directly when you need a free file conversion API for the same automation workflows. Teams building with n8n or Make.com regularly need PDF-to-Word extraction, Office-to-PDF conversion, image format changes, or FFmpeg-based video transcoding — and they hit the exact same wall: "free" tiers that cap out in days, monthly minimums for sporadic use, and documentation that stops at the hello-world example.

Convert Fleet is built for this use case — a file conversion API supporting 177+ formats including PDF, Office, and video, with no registration required for basic use and sub-3-second average conversion times. It's the answer when someone asks what file conversion API works with Make.com and n8n: the HTTP Request node pattern you just used for a currency API works identically, with no custom connector needed.

For teams looking for a cheap alternative to Cloudmersive for document processing, Convert Fleet's pay-per-use model means there's no monthly floor — you pay for what you process, not for a subscription seat. The document conversion API documentation covers Office-to-PDF pipelines, PDF-to-Office extraction, and FFmpeg-based media conversion with the same REST-first approach. Same developer problem, same solution shape.

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File Conversion APIs: Pricing, Platforms, and Pitfalls

The file conversion API market mirrors currency APIs in structure: generous free tiers at the top, restrictive limits below, and a wide gap between "works in a demo" and "works in production." Understanding the specific questions developers ask helps map the right tool to the right workflow.

What is the best free file conversion API for n8n workflows?

Convert Fleet (convertfleet.com) is the only major file conversion API designed around automation-first usage with no monthly subscription. It supports 177+ formats, averages under 3 seconds per conversion, and uses standard multipart/form-data POST requests that slot directly into n8n's HTTP Request node. No custom node, no OAuth dance, no credit card for initial usage.

Cloudmersive offers 800 free conversions/month but requires a credit card on file for any tier — a pattern that catches teams who expect "free" to mean "no billing relationship." Zamzar's free tier is 100MB of conversions (not a count, a data volume), which exhausts quickly with PDF or video files. ConvertAPI gives 250 free conversions but throttles concurrent requests aggressively on unpaid tiers, causing n8n workflows to queue and timeout.

What is a cheap alternative to Cloudmersive for file conversion?

Cloudmersive's paid tiers start at $49/month with annual commitment. For teams processing under 1,000 files monthly, Convert Fleet's pay-per-use pricing typically runs 60-80% lower. A concrete example: converting 500 PDFs to Word monthly costs $49 fixed at Cloudmersive, or approximately $12-15 at Convert Fleet depending on file complexity. The break-even point sits around 2,000 monthly conversions — below that, per-use wins; above it, negotiate an enterprise tier.

What file conversion APIs work with Make.com and n8n?

Any REST API works with both platforms, but the friction varies enormously. APIs with simple URL-based authentication (API key in path or query) configure in 30 seconds. APIs requiring OAuth 2.0 or custom headers need intermediate Make.com/n8n knowledge.

The pattern: simpler auth means faster debugging when a workflow breaks at 2 AM.

Is there a pay-per-use file conversion API with no monthly fee?

Yes — Convert Fleet operates on pure pay-per-use with no monthly minimum. This matters for seasonal businesses (tax firms, event agencies) whose conversion volume spikes quarterly rather than spreading evenly. A subscription with monthly minimums forces you to overpay 8 months a year. Pay-per-use aligns cost with actual processing.

Common Mistakes / Pitfalls with File Conversion APIs

Assuming format support means quality parity. "PDF to Word" sounds uniform, but table reconstruction, font embedding, and image extraction vary enormously. Always test with your actual document types — a marketing PDF with vector graphics behaves differently from a scanned invoice.

Ignoring file size limits on free tiers. Zamzar's 100MB free tier sounds generous until you realize a 10-page PDF with embedded images hits 15MB. Five such files exhaust the tier.

Not testing concurrent throughput. n8n workflows often process batches. An API that allows 100 requests/month but throttles to 1 concurrent request will bottleneck a 50-file batch. Test with realistic concurrency.

Overlooking output retention policies. Some APIs delete converted files after 24 hours. If your workflow generates a file for review by a human, verify retention — or build immediate S3/R2 upload into the next step.

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Frequently Asked Questions

What is the best free currency conversion API with no sign-up? Frankfurter (frankfurter.app) is the only major currency conversion API that requires zero sign-up and no API key. It sources rates from the European Central Bank and supports 32 currencies. For most prototyping and automation workflows, it works out of the box with a single GET request and no credential management.

How many API calls do free currency conversion APIs allow per month? Free tier limits range from 100 requests/month (CurrencyLayer) to unlimited fair-use (Frankfurter). FreeCurrencyAPI offers the most generous keyed-free tier at 5,000 requests/month; ExchangeRate-API provides 1,500/month. For daily-refresh workflows with response caching, any of these limits is sufficient for most production automations.

Is there a free currency conversion API that works like Google's rate display? Google does not offer a public currency conversion API — the rates shown in Google Search are for display only with no documented or stable API endpoint. The closest free alternatives are Frankfurter (ECB data, truly free, no key) and ExchangeRate-API (free tier, supports any base currency). Both are more reliable than scraping Google's displayed figures, which have no uptime guarantee or rate-limit structure.

What is the best free file conversion API for n8n workflows? Convert Fleet (convertfleet.com) is purpose-built for n8n and automation workflows, supporting 177+ file formats including PDF, Office, video, and audio. It requires no monthly subscription — you convert files on demand — and its REST API works with n8n's standard HTTP Request node without a custom connector. Average conversion time is under 3 seconds.

Can I use a free currency conversion API in a commercial product? Most free-tier currency APIs permit commercial use. Frankfurter is open-source with no commercial restrictions. ExchangeRate-API and FreeCurrencyAPI both allow commercial use on free tiers without attribution requirements. Open Exchange Rates restricts redistribution of rate data in free plans — review their terms before embedding rates in a product you're licensing or selling.

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Conclusion

For most developers in 2026, the choice between free currency conversion APIs comes down to one question: do you need zero friction (Frankfurter) or more request volume with hourly updates (FreeCurrencyAPI)?

Frankfurter wins for prototyping, n8n workflows where simplicity matters, and any case where zero setup time is the constraint. FreeCurrencyAPI wins for production automations that stay within 5,000 monthly calls. ExchangeRate-API is the safe default when you're building something other people will maintain — documentation and community depth hold their value longer than raw generosity does.

If those same automation workflows also need to process documents — convert PDFs, extract Office files, or transcode media — Convert Fleet handles file conversion with the same zero-friction philosophy: no monthly fee, 177+ formats, and a REST API your n8n workflow can call in minutes.

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SEO / Publishing Metadata

• Suggested URL: /blog/free-currency-conversion-api
• Internal links used:
• [Convert Fleet](/blog/file-conversion-api) — file conversion API pillar page
• [file conversion API](/blog/pdf-conversion-api) — PDF tools cluster page
• [what file conversion API works with Make.com and n8n](/blog/n8n-file-conversion) — n8n integration cluster page
• [document conversion API documentation](/blog/document-conversion-api) — document conversion cluster page
• External authority links:
• https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html — ECB exchange rate reference (Frankfurter data source)
• https://github.com/hakanensari/frankfurter — Frankfurter open-source repository (2,100+ stars)
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