APIs · head to head
Astra vs curl
Astra
APIs
Instant payments API for push-to-card, card-to-account and FedNow transfers
- From
- On request
- Rated
- -
curl
APIs
Command-line tool for transferring data using URLs with wide protocol support
- From
- Free
- Rated
- -
The short version
- Only curl has a free tier, so it costs nothing to try first.
- Each has a real cost: Astra push-to-card costs materially more per transaction than ACH, so a platform that switches all payouts to instant sees payment costs rise sharply, and the usual answer of charging the recipient for speed only works where recipients will pay.; curl open-source with no vendor pricing: curl is free and open-source under GPL 3.0; no subscription or licensing costs apply
- They diverge on capability: Astra covers Instant disbursements, curl covers HTTP/HTTPS.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Astra and curl 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 Astra
- Instant disbursements
- Card to account
- Net debit mode
- FedNow and RTP transfers
- ACH transfers
- Routing logic
- SDK
- Sandbox
Only in curl
- HTTP/HTTPS
- FTP
- Multiple protocols
- Universal compatibility
- Scripting tools
- Linux support
- MacOS support
- Windows support
What people use each for
The jobs each tool is most often brought in to do.
Astra
- A gig or marketplace platform paying workers to their debit cards at the end of a shift rather than on a weekly ACH cyclenot curl
- An insurer settling small claims instantly to a claimant debit card to remove the cheque processnot curl
- A lending product disbursing approved funds in seconds so the borrower experience matches the approval decisionnot curl
- A consumer fintech letting users fund a new account from an existing debit card so the balance is usable immediatelynot curl
curl
- API Developmentnot Astra
- API Gatewaynot Astra
- API Testingnot Astra
- API Documentationnot Astra
- Microservicesnot Astra
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Astra
- Push-to-card costs materially more per transaction than ACH, so a platform that switches all payouts to instant sees payment costs rise sharply, and the usual answer of charging the recipient for speed only works where recipients will pay.
- Original Credit Transaction support is not universal across card issuers, so a proportion of payouts fall back to slower rails and you must build and explain a two speed experience rather than promising instant to everyone.
- The programme depends on Cross River Bank as sponsor, a bank with concentrated fintech exposure and a documented regulatory history, so a single supervisory action on that institution is a direct operational risk to your payouts.
- Nothing is published on pricing, and per transaction economics vary by rail and volume, so small platforms cannot estimate cost before a sales conversation and have limited leverage in it.
- FedNow reach still depends on the recipient bank participating, so instant account-to-account is not available to every recipient and the routing logic has to degrade gracefully, which is more integration work than the single API framing suggests.
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
Pricing, plan by plan
Astra
On request- Astra Payments$undefined/year
- Per transaction pricing quoted by volume and rail
- Push-to-card economics differ materially from ACH
- Net debit mode available in place of prefunding
curl
Free- Open SourceFree
- Full curl functionality
- Community support
Which should you pick?
Choose Astra if
- You need instant disbursements.
- You work on API, Web, iOS, Android.
- You also want card to account.
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.
Questions people ask
- Is Astra or curl better?
- Neither clearly leads. Astra starts at On request and curl at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Astra or curl?
- curl has a free tier; the other does not. Paid plans start at On request for Astra and Free for curl.
- Does Astra or curl run on more platforms?
- Astra runs on API, Web, iOS, Android. curl runs on Linux, MacOS, Windows, Unix, Mobile.
- Can I use curl for free?
- Yes. curl has a free tier, so you can try it without paying. Astra starts at On request.
- What is Astra best used for?
- Astra is most often used for a gig or marketplace platform paying workers to their debit cards at the end of a shift rather than on a weekly ach cycle, an insurer settling small claims instantly to a claimant debit card to remove the cheque process, a lending product disbursing approved funds in seconds so the borrower experience matches the approval decision, a consumer fintech letting users fund a new account from an existing debit card so the balance is usable immediately. Of those, a gig or marketplace platform paying workers to their debit cards at the end of a shift rather than on a weekly ach cycle and an insurer settling small claims instantly to a claimant debit card to remove the cheque process are not what curl is typically brought in for.
- What can Astra do that curl cannot?
- Astra covers Instant disbursements, Card to account, Net debit mode, FedNow and RTP transfers. curl covers HTTP/HTTPS, FTP, Multiple protocols, Universal compatibility.
Answered from the vendors’ own pages
Astra: Who is the sponsor bank?
Cross River Bank. All banking and payment services run through that relationship, so the bank should be part of your diligence rather than an implementation detail.
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.
SourceAstra: Do I have to prefund payouts?
Not necessarily. Astra offers a net debit arrangement where disbursements settle against a reserve rather than a permanently funded float account, which is the main working capital argument for the product.
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.
SourceAstra: Is every payout instant?
No. Push-to-card requires the recipient card issuer to support Original Credit Transactions, and FedNow requires the recipient bank to participate. The rest fall back to ACH.
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.
SourceAstra: What does it cost?
Nothing is published. Pricing is per transaction and varies by rail and volume, and card rails cost considerably more than ACH.
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