About C4CHECK

C4CHECK is a card verification platform. It answers one focused question for merchants, developers and payment teams: is a payment card active and chargeable? Results are returned as clear states — live, dead, unknown or error — and every check is billed from a prepaid BTC/LTC balance.

What we do

• Live checkers for multiple gateways, each tuned for throughput and its own timeout/fallback behaviour.
• Bulk checking with streaming results: the first card appears in seconds while large lists continue in the background.
• A REST API for automation, billed per classified result.
• Free client-side tools — a Luhn validator and BIN lookup that never send anything to our servers.

How we build

Verification runs through real issuer checks against upstream gateways — never simulated. Our engine uses rolling concurrency windows, per-gateway batch sizing, automatic fallback for transient errors and strict expense controls: a check that produces no classified result is not charged. Card data is never written to application logs, and results are visible only in the owner's history.

Why verification matters

Stored payment methods decay: cards expire, accounts close and issuer rules change. Businesses discover that only when a charge fails. Systematic verification before billing cycles keeps customer relationships intact and reduces involuntary churn. Our guides explain the practical workflows in depth.

Contact

Questions, billing issues or partnership requests — see the contact page.

What C4CHECK is

C4CHECK is a prepaid card-verification platform. It exposes a web checker and a REST API that ask card issuers a single question — is this account active — and classify the answer as live, dead, unknown or error. The platform has been built around three principles: results should be honest (four classes, no over-claiming), billing should be honest (per classified result, errors free), and data handling should be boring (account-scoped history, a 90-day retention default, no third-party sharing of check data).

The platform does not process payments and never moves money. It does not buy, sell or exchange card data, and it does not provide cards. Verification is an operational tool for teams working with cards they own or are authorised to process — payment operations, fraud prevention, QA and risk teams.

How the platform runs

Checks are routed through one or more configured gateways; each gateway maps to a provider with its own format, pricing and behaviour. A fallback route lets unclassified cards be retried elsewhere. The balance is funded with BTC or LTC, and every check writes a history row with cost and outcome, so spend and results are auditable at the individual check level.

Reference data — hundreds of thousands of issuer BIN ranges — powers the free tools and the public BIN endpoint. It is issuer metadata only: no account information is stored or exposed.

Who runs it

The platform is operated by a small team focused on verification quality and honest reporting. Support runs through the in-dashboard ticket system and the in-dashboard support form, with responses typically within one business day. Feature requests and integration questions are welcome through the same channel.