KOVRELLSee it liveSee a live verification

Kovrell calls the vendor before you pay.

A voice agent verifies every bank-detail change on the vendor's number of record, asks what only the real vendor knows, and holds the payment until it checks out.

See a live verification Try it on your own vendor

Northwind Steel, 01:39, verified

A real Kovrell verification call. Vendor answers spoken by a scripted test caller.

Checks on this call

IdentityPass
Vendor confirms the requestPass
INV-4471 totalPass
INV-4502 totalPass
INV-4502 payment datePass
Readback of new accountPass

$184,200.00Verified

Released to Chase ending 8841.

A real verification run, Sep 24, 2026

00:00
Request held
00:00
Number verified
00:00
Vendor called
01:20
Challenge passed
01:39
Payment released
01:39
Evidence sealed

The call your team skips

The control exists. People skip it.

94% of companies say they call the vendor back on a number from official records. Only 63% say that control works well. Kovrell makes the call mandatory, runs it the same way every time, and records it. AFP 2026, PDF p. 15

Every bank change is held and checked first.

An email asks to move $184,200.00 to a new bank. Kovrell holds the payment, ignores the callback number in the email, and checks that the number of record is old and unchanged before it dials.

Northwind Steel

Bank change by email. Contact of record Jide Okafor.

$184,200.00

HELD

On file

First Citizens Bank 2209

Requested

Chase 8841

Number of record ageOn file since 2025-03-11 (562 days).ok

Contact changed in last 30 daysNo contact changes.ok

Callback contact from the request+1 512 555 0199 came with the request. Not used.info

Calling Jide Okafor +1 512 555 0142

VERIFIED

00:18IdentityHeard: Jide Okafor at Northwind Steelpass

00:36Vendor confirms the requestHeard: Confirmed they moved operating account to Chase last month.pass

00:54INV-4471 totalHeard: 96,325.00pass

01:07INV-4502 totalHeard: 127,400.00pass

01:20INV-4502 payment dateHeard: September 12thpass

01:32Readback of new accountHeard: confirmedpass

It calls the number of record and checks the answers.

Three questions from the ledger, one attempt each. The agent never says the answers and never says whether one was right. Fixed rules release the payment to Chase ending 8841.

Hear for yourself

The evidence

Every run leaves a sealed record.

The recording, the transcript, every tool call, and the expected versus heard answers, sealed with sha256. Download this run and check the hash yourself.

Download the sealed record Download the PDF report

sha256d17939c156d5...ba11ffcf

Open the full evidence pack

Transcript

00:09 Agent

Hi, this is the automated payments assistant from Acme Manufacturing accounts payable. This call is recorded. Is this Jide Okafor at Northwind Steel?

00:17 Vendor

Yes, this is Jide Okafor at Northwind Steel.

00:28 Agent

Thanks. This is a quick routine check to make sure your payments go to the right place. We got a request to change the bank account we pay Northwind Steel. Did your team ask for that change?

00:34 Vendor

Yes, we did. We moved our operating account to Chase last month.

00:46 Agent

Great. I just have three quick questions from our records. What was the total amount on invoice INV-4471?

00:53 Vendor

That one was $96,325.

00:59 Agent

What was the total amount on invoice INV-4502?

01:06 Vendor

$127,400.

01:13 Agent

On what date did you receive our payment for invoice INV-4502?

01:19 Vendor

We received it on September 12th.

01:27 Agent

Last one. The request asks us to pay Chase, account ending 8 8 4 1. Is that right?

01:30 Vendor

Yes, that's correct.

01:39 Agent

That's everything. Thanks for your help. Our accounts payable team will follow up by email. Have a good day.

Expected vs heard

INV-4471 total

$96,325.00 / 96,325.00

INV-4502 total

$127,400.00 / 127,400.00

INV-4502 payment date

2026-09-12 / September 12th

Verdict

VERIFIED

Released to Chase ending 8841.

Identity, 3 of 3 ledger checks, and readback confirmed.

Built for audit

Controls that hold up

A callback control, run the same way on every change.

Number of record only

Kovrell calls the contact in your vendor master. A callback number inside the request is logged and never used.

Provenance lock

If the number of record changed in the last 30 days, the call is locked and a person has to verify.

Ledger challenge

Three questions only the real vendor can answer, drawn at random from recent paid invoices on every call. The agent never hears the answers.

One attempt per question

The first answer counts. Retries are logged and ignored, so a caller cannot guess their way through.

Fixed verdict rules

The model collects answers. Code decides: pass releases, fail blocks, anything else keeps the payment held.

Sealed evidence

Recording, transcript, every tool call, and expected versus heard answers, sealed with sha256.

Integration

Plugs into your payment run.

Your ERP keeps the vendor master and the payment schedule. Kovrell holds the payment, makes the call, and tells your ERP what to do.

How to integrate

01
Sync vendors and paid invoices
The contact of record, the bank on file, and recent paid invoices, from your vendor master.
POST /api/vendors
02
Hold the payment on a bank change
Send each change request. The vendor's next payment is held until a call decides it.
POST /api/requests
03
Get a signed verdict
When the call ends, your webhook gets the verdict and payment status, signed with HMAC-SHA256.
verification.completed
04
File the evidence
Every run has a sealed JSON record and a PDF report for the audit file.
GET /api/runs/:id/pdf

Built on

Real infrastructure, end to end.

Every verification call runs live through the AssemblyAI Voice Agent API. This showcase uses a scripted test vendor and sample ledger data.

Voice Agent API

Universal-3.5 Pro speech-to-text, turn detection and barge-in, JSON Schema tool calls, the agent's voice, and the session recording and timeline that seal each evidence pack.