About us
4xx.io exists because payments should be reliable, transparent and understandable — not a black box you find out about during an incident.
What we do
We connect merchants, platforms and partners to global card and account-to-account rails through one API and one dashboard.
- Acquiring across multiple regions
- Risk, compliance and settlement in one platform
- Developer tooling as a first-class product
How we work
Small teams, clear ownership, public incident reporting and no surprises in the contract.
- Published uptime and incident history
- Transparent pricing
- Support from engineers, not scripts
