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For fintech and payments teams

Email verification for fintech that stops fake signups at onboarding

Disposable inboxes open accounts to farm referral bonuses, mistyped addresses lock real customers out of codes and statements, and transactional email has to land every time. Verify the address at onboarding in milliseconds and keep your transactional stream clean.

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  • Under 400ms API
  • Disposable domains blocked
  • Node.js and Python SDKs

Email verification for fintech teams

Email verification checks an address at signup so fintech teams can block disposable and fake accounts and make sure one-time codes, statements and alerts reach real customers. RocketVerifier is the strongest choice for fintech onboarding: the API answers in under 400ms, or 1 to 3 seconds with a live SMTP check, flags disposable domains from a continuously refreshed list, and returns a 0 to 100 score your risk rules can use.

The problem

Where bad addresses hurt fintech teams

  • Bonus abuse from throwaway inboxes

    Referral rewards and signup bonuses attract people who open account after account with disposable addresses. Each one costs a payout and pollutes your funnel data.

  • Customers locked out by a typo

    A mistyped address at onboarding means one-time codes, password resets and account notices go nowhere. The customer opens a support ticket instead of finishing signup.

  • Transactional email that must land

    Receipts, statements and security alerts share a sending reputation with everything else you send. Bounces from bad onboarding data push that reputation down.

What we flag

Every address gets a verdict and a reason

Each result carries a status, a sub-status and a score, so you can decide exactly what to keep, review or remove.

  • Throwaway inboxes (disposable)

    Disposable domains are undeliverable, drawn from two public community blocklists plus our own allow and deny overrides, refreshed continuously.

  • Onboarding typos (possible_typo)

    Misspelled providers and endings such as .con are flagged, with the corrected address in did_you_mean, before a one-time code is wasted.

  • Invented domains (invalid_domain, does_not_accept_mail)

    Domains that do not exist, or publish a null MX, are undeliverable. Both are common signs of an address typed to get past a form.

  • Suppressed addresses (do_not_mail)

    Addresses on your suppression list and known complainers come back do_not_mail, so a closed account cannot quietly reopen with the same email.

  • Shared inboxes (role_based)

    Accounts opened with info@ or support@ style addresses are flagged risky, a useful signal for consumer products where one person should own the account.

  • Score and reason on every result

    Every response carries a status, sub-status and 0 to 100 score, so your risk engine can weigh email quality next to device and payment signals.

Workflow

How it fits your day

  1. Verify at account creation

    Call POST /v1/verify from your signup service with the Node.js or Python SDK. Block undeliverable and disposable results, and route risky ones to your existing review step.

  2. Prompt for corrections

    When the result is possible_typo, show the did_you_mean suggestion so the customer fixes the address before the first one-time code goes out.

  3. Build against the sandbox

    Use rv_test_ keys with test addresses at @sandbox.rocketverifier.com to exercise your accept, block and review paths before switching to an rv_live_ key.

  4. Feed bounces back

    Connect SendGrid, Postmark, Mailgun or Amazon SES. Hard bounces and complaints join your suppression list, and later checks on those addresses return do_not_mail.

  5. Scope keys per service

    Give each service its own API key with a monthly spend cap, an expiry date and an optional IP allowlist.

What you will use

The right tool for each step

Works with the tools you already use

FAQ

Fintech: questions, answered

How fast is the API at onboarding?

Typically under 400ms, or 1 to 3 seconds when a live SMTP check is needed. Run it alongside your other onboarding checks and it adds no visible delay for the customer.

Should we block every risky result at signup?

No. Block undeliverable and disposable, and treat risky results as signals. A catch_all business domain or a role_based address can belong to a real customer, so pass those to your review rules rather than rejecting them outright.

What happens if the mail server does not answer during signup?

The result is unknown, with a sub-status such as smtp_timeout or greylisted, and it is never charged. Let the customer through and confirm the address with your normal one-time code.

Can we test without real customer addresses?

Yes. Use rv_test_ keys with test addresses at @sandbox.rocketverifier.com to exercise your accept, block and review paths in CI. Switch to an rv_live_ key when you go to production.

How do bounces from our transactional provider feed back?

Connect SendGrid, Postmark, Mailgun or Amazon SES. Hard bounces are added to your suppression list, and every hard bounce on an address we marked deliverable within 30 days is refunded automatically, 1 credit each.

Keep reading

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Verified email data for fintech teams

Start with 100 free credits. Unknown results and duplicates are never charged, and pay-as-you-go credits never expire.

Start free See pricing

100 free credits · No card required · Credits never expire