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APIs · head to head

Astra vs Svix

Astra logo

Astra

APIs

Instant payments API for push-to-card, card-to-account and FedNow transfers

From
On request
Rated
-
Full reviewWebsite
Svix logo

Svix

APIs

Outbound webhook sending as a service, with retries, signing and a customer-facing portal

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Svix 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.; Svix the Professional tier at 490 US dollars a month includes the same 50,000 messages as the free tier, so the upgrade buys SLA, throughput and retention rather than volume, which is a jarring step for a growing product.
  • They diverge on capability: Astra covers Instant disbursements, Svix covers Automatic retries.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Astra and Svix actually diverge.

Attributes where Astra and Svix differ
AttributeAstraSvix
Starting priceOn requestFree
Pricing modelquotePer month by message count
Free tierNoYes
PlatformsAPI, Web, iOS, AndroidWeb, Cloud, Docker

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 Svix

  • Automatic retries
  • Payload signing
  • Consumer portal
  • Event types and filtering
  • Delivery logs and replay
  • Rate limiting
  • Static source IPs
  • Language SDKs

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 Svix
  • An insurer settling small claims instantly to a claimant debit card to remove the cheque processnot Svix
  • A lending product disbursing approved funds in seconds so the borrower experience matches the approval decisionnot Svix
  • A consumer fintech letting users fund a new account from an existing debit card so the balance is usable immediatelynot Svix

Svix

  • A SaaS company adding webhooks to its API that does not want to build retry, signing and a customer debugging UI from scratchnot Astra
  • A payments or fintech product whose customers need signature verification libraries in several languages they did not writenot Astra
  • An engineering team drowning in support tickets from customers whose endpoints silently failed and who need self-service delivery logsnot Astra
  • A platform with a small number of very slow customer endpoints that must not delay deliveries to everyone elsenot 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.

Svix

  • The Professional tier at 490 US dollars a month includes the same 50,000 messages as the free tier, so the upgrade buys SLA, throughput and retention rather than volume, which is a jarring step for a growing product.
  • Only attempted messages count toward usage, but a customer with many subscribed endpoints multiplies a single event into many billable messages, and forecasting that fan-out before launch is difficult.
  • The open source server is MIT licensed but trails the hosted product in features, so self-hosting is a fallback position rather than a genuinely equivalent option.
  • Routing outbound customer traffic through a third party puts a vendor in the delivery path for events your customers may treat as contractual, which some security reviews will not accept.
  • Payload retention is 30 days on the free tier and 90 on Professional, so anyone needing longer delivery history for audit must pay for Enterprise or log independently.

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

Svix

Free
  • FreeFree
    • 50,000 messages a month included
    • Overage at $0.0001 per message
    • 99.9% uptime SLA
  • Professional$490/month
    • 50,000 messages included, same as free
    • 99.99% uptime SLA
    • 800 messages per second
  • Enterprise$undefined/year
    • Custom volume and rate limits
    • 99.999% uptime SLA
    • Custom retention

Which should you pick?

Choose Astra if

  • You need instant disbursements.
  • You work on API, Web, iOS, Android.
  • You also want card to account.
Astra review

Choose Svix if

  • You need automatic retries.
  • You want to start without paying.
  • You work on Web, Cloud, Docker.
  • You also want payload signing.
Svix review

Questions people ask

Is Astra or Svix better?
Neither clearly leads. Astra starts at On request and Svix at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Astra or Svix?
Svix has a free tier; the other does not. Paid plans start at On request for Astra and Free for Svix.
Does Astra or Svix run on more platforms?
Astra runs on API, Web, iOS, Android. Svix runs on Web, Cloud, Docker.
Can I use Svix for free?
Yes. Svix 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 Svix is typically brought in for.
What can Astra do that Svix cannot?
Astra covers Instant disbursements, Card to account, Net debit mode, FedNow and RTP transfers. Svix covers Automatic retries, Payload signing, Consumer portal, Event types and filtering.

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.

Svix: How much does Svix cost?

Free up to 50,000 messages a month; Professional starts at 490 US dollars a month with the same included volume but better SLA and throughput.

Astra: 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.

Svix: Can I self-host it?

Yes, there is an MIT licensed server, but it lags the hosted service in features and has no SLA.

Astra: 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.

Svix: What counts as a message?

Attempted or transformed deliveries. Retries and messages filtered out because no endpoint subscribed are not charged.

Astra: 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.

Svix: Does it handle inbound webhooks?

Its focus is outbound sending on behalf of API providers, not receiving webhooks from third parties.

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