APIs · head to head
curl vs i2c
curl
APIs
Command-line tool for transferring data using URLs with wide protocol support
- From
- Free
- Rated
- -
i2c
APIs
Configurable card issuing and banking processing platform for banks and programme managers
- From
- On request
- Rated
- -
The short version
- Only curl has a free tier, so it costs nothing to try first.
- Each has a real cost: curl open-source with no vendor pricing: curl is free and open-source under GPL 3.0; no subscription or licensing costs apply; i2c developer experience lags API-native competitors, and teams expecting Stripe-grade documentation and sandboxes find an enterprise integration project instead.
- They diverge on capability: curl covers HTTP/HTTPS, i2c covers Configurable product engine.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which curl and i2c actually diverge.
Identical on both: user rating (Not yet rated), category (APIs).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in curl
- HTTP/HTTPS
- FTP
- Multiple protocols
- Universal compatibility
- Scripting tools
- Linux support
- MacOS support
- Windows support
Only in i2c
- Configurable product engine
- Credit and instalments
- Multi-currency
- Fraud and risk tooling
- Digital banking front ends
- Global scheme connectivity
What people use each for
The jobs each tool is most often brought in to do.
curl
- API Developmentnot i2c
- API Gatewaynot i2c
- API Testingnot i2c
- API Documentationnot i2c
- Microservicesnot i2c
i2c
- A bank wanting credit, debit and prepaid portfolios on one processor rather than threenot curl
- An issuer in a market where local scheme and currency support rules out US-centric processorsnot curl
- A programme manager launching instalment products without building a lending corenot curl
- A credit union replacing an ageing processor without writing custom code for product rulesnot curl
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
curl
- Open-source with no vendor pricing: curl is free and open-source under GPL 3.0; no subscription or licensing costs apply
- Commercial support costs hidden: site references 'commercial support available' but pricing is not detailed or accessible from homepage
- No SaaS model: curl is a command-line tool and library; costs are limited to optional commercial support contracts (pricing unknown)
- Self-support burden: free software means customers rely on community forums or undisclosed commercial support pricing
i2c
- Developer experience lags API-native competitors, and teams expecting Stripe-grade documentation and sandboxes find an enterprise integration project instead.
- Implementations lean on i2c or partner professional services, so timelines and costs are set by a services queue rather than by your own engineering speed.
- Pricing is per active card and per transaction with monthly minimums, none of it published, so comparing bids requires modelling your own portfolio carefully.
- Configuration flexibility means product behaviour lives in platform settings rather than in your repository, which complicates version control, testing and audit trails.
- As a private company with a broad global footprint, regional support depth is uneven, and a programme in a smaller market may get thinner service than a flagship account.
Pricing, plan by plan
curl
Free- Open SourceFree
- Full curl functionality
- Community support
i2c
On request- i2c processing platform$undefined/year
- Per-active-card and per-transaction processing fees
- Minimum monthly commitments by programme
- Implementation and configuration professional services
Which should you pick?
Choose curl if
- You need http/https.
- You want to start without paying.
- You work on Linux, MacOS, Windows, Unix, Mobile.
- You also want ftp.
Choose i2c if
- You need configurable product engine.
- You work on Web, REST API.
- You also want credit and instalments.
Questions people ask
- Is curl or i2c better?
- Neither clearly leads. curl starts at Free and i2c at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, curl or i2c?
- curl has a free tier; the other does not. Paid plans start at Free for curl and On request for i2c.
- Does curl or i2c run on more platforms?
- curl runs on Linux, MacOS, Windows, Unix, Mobile. i2c runs on Web, REST API.
- Can I use curl for free?
- Yes. curl has a free tier, so you can try it without paying. i2c starts at On request.
- What is curl best used for?
- curl is most often used for api development, api gateway, api testing, api documentation. Of those, api development and api gateway are not what i2c is typically brought in for.
- What can curl do that i2c cannot?
- curl covers HTTP/HTTPS, FTP, Multiple protocols, Universal compatibility. i2c covers Configurable product engine, Credit and instalments, Multi-currency, Fraud and risk tooling.
Answered from the vendors’ own pages
curl: How much does curl cost?
curl is free and open-source software under the GPL 3.0 license. There is no cost to download, use, or modify the software.
Sourcei2c: Does i2c issue the cards itself?
No. It processes; issuance sits with a bank or licensed issuer, and in most markets you need that relationship separately.
curl: Is commercial support available for curl?
Yes. The curl website references 'commercial support available,' but pricing and details are not disclosed on the homepage and require visiting the support page.
Sourcei2c: Can it handle revolving credit?
Yes. Credit, instalments and buy-now-pay-later sit on the same platform as debit and prepaid, which is unusual among modern processors.
curl: Can I sponsor curl financially?
Yes. The curl website offers an option to 'Sponsor curl financially.' Visitors can donate to support curl development, but the donation link must be accessed through the site's support section.
Sourcei2c: Is it self-serve?
No. Expect a configuration-led implementation with professional services rather than signing up and calling an API.
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