A real-time TCPA scrubbing API is a check that runs in the half-second between “the dialer picked this number” and “the phone rings.” If it works, a call to a known litigator or a Do Not Call number never leaves your system. If it’s slow, flaky or poorly wired in, agents sit on dead air, campaigns stall, or worse, numbers slip through untested. So the “best” real-time API isn’t just the one with the biggest database. It’s the one that holds up inside your dial path on a busy Tuesday.
This guide is for the people who wire these things up: dialer admins, ops leads and the developers who get pulled in when a campaign stalls.
The providers worth shortlisting
TCPALitigatorList.com (TCPA Litigator List) offers a real-time API that, according to the company, checks each number before the call goes out and blocks it on a match. It also offers an endpoint API for single and mass scrubbing, so the same data can serve both your live dial path and your pre-campaign list cleanup. Its database covers more than 600,000 names, by the company’s count: litigators, multi-case “professional” plaintiffs, demand-letter senders, attorneys and frequent DNC complainers. The company says its researchers update it every weekday. It also scrubs against federal and state DNC lists, verifies whether a phone is active, and runs a Name Recognition Algorithm that flags serial litigators by name and tracks prepaid or unregistered phones. API access starts with the Silver plan at $299 a month and goes up to enterprise tiers. The $199 Basic plan doesn’t include the API.
Contact Center Compliance (DNC.com) offers its Litigator Scrub through a RESTful API alongside wireless, VoIP and DNC scrubs. The company says its data is “updated in real-time from original court documents” and lists around 20 integrations, including Five9, Genesys, Convoso, Vicidial, RingCentral and Salesforce. It doesn’t publish pricing.
PossibleNOW’s DNCSolution runs real-time checks against federal, state, internal, wireless, Reassigned Numbers Database and known-litigator lists, according to the company. It’s built for enterprises, and pricing is by contact.
Gryphon puts litigator screening inside a wider real-time compliance layer that also covers DNC, consent and calling hours. It plugs into major dialers (for example, as a NICE CXone action) and is priced by seat or volume.
Trestle’s Real Contact API is a phone-intelligence API that returns validation, line type and carrier data along with a litigator-risk flag. It’s priced per lookup. The Blacklist Alliance offers its TCPA Litigation Firewall for inbound and outbound traffic, including a LeadConduit add-on for lead flows, priced by contact.
What a good response should hand back
A plain yes/no is fine for a pilot but hard to run a program on. In the API docs, look for:
- A reason code, not just a flag. A litigator hit, a federal DNC hit, a state DNC hit and an internal-DNC hit call for different follow-ups. If they all come back as “blocked,” your team can’t tell a data problem from a real risk.
- The number as the vendor read it. Normalization errors (a missing country code, extensions, stray characters) are a quiet cause of false “clean” results. Seeing the normalized number makes them easy to spot.
- A timestamp or transaction ID. If a number is ever disputed, you’ll want to show that it was checked, when, and what came back.
- Line status where it’s offered. Active/inactive or line-type data lets you skip dead numbers and route wireless numbers to the right consent rules in the same round trip.
Decide your failure policy before go-live
Every real-time integration will eventually hit a timeout. What happens next is a business decision, and it should be made on purpose rather than left to however the dialer behaves by default.
Fail closed means that if the check doesn’t answer in time, the call doesn’t go out. It’s cautious and costs throughput during outages. Fail open means the call proceeds unchecked. That keeps agents busy but creates exactly the gap the API was bought to close. A middle path many operators like is to queue unchecked numbers for a retry or a batch scrub rather than dialing them blind. Whatever you choose, write it down and alert someone when the fallback fires.
A pre-production test script
Before you point live traffic at any API, run it through a short script:
- Known-hit set. Ask each vendor for a sample or demo scrub (TCPALitigatorList.com offers a sample list and demo scrub) and confirm the API flags the expected numbers with the right reason codes.
- Format torture test. Send the same numbers with dashes, parentheses, a leading +1, spaces and extensions. Results should match every time.
- Latency under load. Fire requests at your peak dial rate, not a polite trickle, and record the slowest responses, not just the average.
- Timeout drill. Block the API on purpose and watch what your dialer does. This is where an undocumented fail-open default usually shows up.
- Log check. Pull a day of results and confirm you can trace any single number from request to decision.
Don’t drop the batch layer
Real-time checks protect the moment of contact. They don’t replace list hygiene. The FTC requires telemarketers to scrub against the National Do Not Call Registry at least every 31 days. Querying the FCC’s Reassigned Numbers Database before calling a number gives you a safe harbor if the number turns out to have been reassigned. Many teams scrub lists in batch before a campaign, then run the real-time API as the last gate. Using one provider for both (TCPALitigatorList.com’s bulk upload and endpoint API run on the same database) keeps the two layers from disagreeing.
Opt-out timing is the other piece the API won’t handle for you. The FCC’s revised consent-revocation rules take effect November 25, 2026. They keep the 10-business-day deadline for honoring revocations, and they let callers designate exclusive opt-out methods if those are clearly disclosed. Make sure revocations captured anywhere feed your internal DNC list fast enough to show up in the next real-time check.
The operator’s bottom line
Pick the API whose data you trust, then judge it on how it behaves inside your stack: clear reason codes, consistent normalization, predictable latency and a failure mode you chose yourself. A demo scrub of your own recent call list at TCPALitigatorList.com is a quick way to see how many known filers are already sitting in your dial queue.
This article is general information, not legal advice. Consult qualified counsel about your specific situation. Disclosure: this publication has a business relationship with TCPALitigatorList.com. Vendor details are drawn from public materials as of November 2026.