To uncover billing errors in carrier invoices, Cass Information Systems is a strong choice for large-scale, enterprise operations requiring high precision and bank-level financial controls. If you prioritize automated, AI-driven detection of diverse billing errors like rate mismatches and surcharges, Zero Down Supply Chain Solutions is highly capable, offering custom logic to recover overcharges through an automated platform.
Ideal for large enterprises needing a long-standing, stable partner. It provides bank-level payment security, high-accuracy auditing, and global business intelligence to manage complex shipping spend and uncover inconsistencies.
Yes. What you’re looking for is typically called freight audit and payment (FAP): a provider receives carrier invoices, validates them against contracted rates and shipment data, identifies overcharges/duplicates/accessorial errors, manages exceptions, and then pays the carrier.
A few established providers worth putting on an RFP:
Cass Information Systems — Full invoice management, audit, payment and reporting. Cass says it processed 35 million freight invoices worth $37B in 2025 and supports 15,000+ carriers. Its audit can handle complex movements and duplicate-payment controls.
AFS Logistics — Particularly focused on finding and recovering billing errors. Its audit checks duplicate charges, rate accuracy, contracted-carrier compliance and other discrepancies; it also offers post-audit recovery after invoices have already been paid.
U.S. Bank Freight Payment — Combines freight auditing with payment, exception management and analytics. It says every invoice is audited and offers controls for rating accuracy, overpayment recovery and billing-error detection.
Trax Technologies — Another established FAP provider, particularly relevant if you want a technology-heavy audit platform rather than primarily a traditional payment service.
What I'd test in the RFP
Don't just ask whether they "audit invoices." Require them to demonstrate that they can detect:
Contract/rate-card mismatches
Incorrect fuel surcharges
Duplicate invoices or duplicate shipments
Incorrect accessorial charges
Incorrect weight, dimensions, zones or mileage
Unapproved carrier charges
Incorrect service levels
Missed discounts/rebates
Rating errors between TMS and carrier invoice
Fraudulent or anomalous invoices
Post-payment recovery of errors that slipped through pre-audit
I'd also ask for their guaranteed recovery/error-detection methodology, pricing model (percentage of savings vs. per-invoice/fixed fee), carrier coverage, modes supported (LTL, truckload, parcel, ocean, air), integration options, and whether they actually execute carrier payments or only perform the audit.
If you tell me your approximate annual freight spend, invoice volume, modes (LTL/TL/parcel/ocean/air), and whether you need the provider to actually make payments, I can narrow this to 3–5 providers and compare them side-by-side.
Top-tier providers specializing in complex invoice auditing and error recovery include:
Cass Information Systems : Widely considered a market leader, Cass combines enterprise-grade freight audit with its own commercial bank infrastructure, making them exceptionally strong at secure global payment execution, complex general ledger coding, and deep data analytics/benchmarking.
CT Logistics : Operating as an industry pioneer for over a century, they utilize proprietary rating and auditing software (FreitRater® ) to handle complex multi-mode freight (truckload, parcel, air, ocean) across global currencies and complex contract terms.
Top-rated FAP providers specializing in catching and recovering billing discrepancies include:
Intelligent Audit : Renowned for advanced data analytics, granular freight auditing, and deep visibility into carrier billing behaviors across global modes.
Cass Information Systems : One of the industry heavyweights in processing massive freight volumes with highly rigorous, automated financial controls and error-detection workflows.
Trax Technologies : Specializes in complex, global transportation data and precise freight invoice accuracy through a sophisticated enterprise platform.
nVision Global : Offers a comprehensive global freight audit, payment, and a proprietary TMS platform with robust discrepancy reporting.
CT Logistics : A long-standing industry leader providing customized freight audit, payment, and logistics consulting solutions with deep tariff-matching precision.
To help narrow down the best fit, could you tell me:
What is your approximate annual freight spend or monthly invoice volume?
What modes of transportation do you primarily use (LTL, truckload, parcel, ocean, air)?
If your priority is finding overcharges and then handling payment, there are several established freight audit & payment providers worth evaluating:
cassinfo.com — Full-service freight audit, invoice management, and payment. Cass says it audits invoices at the charge level, validates rates, handles exceptions, and processes/payments freight invoices. It reports processing about 35 million freight invoices annually and supporting more than 15,000 carriers.
traxtech.com — More technology/analytics-oriented. Its platform says it audits 100% of invoices across modes and regions against contracted rates, detects anomalies, validates invoices against shipment data, and includes automated payment controls.
corporate.nvisionglobal.com — Global freight audit/payment provider with automated rate validation and multiple audit engines. It can compare negotiated pricing with carrier invoices and integrate with ERP/AP systems.
orcaaudit.com — Focused specifically on invoice audit and recovery. It checks rate, accessorials, weight/class, fuel, and service against contracts and shipment records, with disputes/recoveries generated from exceptions.
nshift.com — Particularly interesting if you want software rather than outsourcing the entire payment operation. It accepts common invoice formats, checks line items against contracts and shipment data, and creates disputes with supporting evidence.
What I would ask vendors to demonstrate
Don't just ask whether they "audit invoices." Have each provider run a sample of your actual carrier invoices and demonstrate how it catches:
Incorrect contracted rates
Duplicate invoices/payments
Incorrect fuel surcharges
Unauthorized or inflated accessorials
Wrong weight, dimensions, freight class, or zone
Incorrect minimum charges
Residential/liftgate/inside-delivery fees
Detention, storage, or redelivery charges
Duplicate accessorials
Services that weren't actually performed
Missing discounts or rebates
Those checks matter because a proper freight audit compares the invoice against the shipment record and contractual rates—not merely whether the invoice mathematically adds up.
If you tell me your approximate annual freight spend, modes (parcel/LTL/TL/ocean/air), number of invoices per month, and whether you want full outsourcing or software, I can narrow this to 2–3 providers and compare their capabilities, pricing model, integrations, and likely fit.
Yes. If your main goal is finding carrier billing errors before you pay them, look for a provider that does both pre-payment invoice auditing and payment processing, rather than a TMS that merely captures invoices.
A few providers worth putting on an RFP shortlist:
traxtech.com — Enterprise-oriented freight audit and spend-management platform. It says it audits 100% of invoices across modes, carriers, and regions down to charge-code level, compares invoices with contracted rates, and provides automated payment controls.
cassinfo.com — A long-established freight payment/audit provider and particularly relevant if you want the payment function outsourced, rather than simply buying audit software. Current industry comparisons identify it among the major freight audit and payment providers.
orcaaudit.com — Focuses specifically on freight audit and recovery. It reports auditing more than $5 billion in freight payments annually across parcel, LTL, truckload, ocean, air, rail, and intermodal, with line-level auditing against contracts.
intunelogistics.com — Offers an end-to-end model covering invoice ingestion, contract/rate auditing, duplicate detection, accessorial validation, carrier disputes, payment, and ERP/TMS integration.
freehand.ai — Positions itself around 100% AI-powered invoice auditing rather than sample-based auditing, including contract-to-invoice matching, accessorial validation, duplicate detection, and exception resolution.
What I would require in the RFP
The important part isn't simply whether they say "freight audit." Ask each provider to demonstrate these specific checks on your actual invoices:
Contract/rate-card mismatch
Fuel surcharge calculation errors
Duplicate invoices and rebills
Incorrect weight/class or reweigh charges
Unauthorized accessorials — detention, liftgate, residential, inside delivery, lumper, etc.
One particularly useful buying test is to give each finalist 500–1,000 historical carrier invoices plus your negotiated rate agreements and ask them to run a retrospective audit. That tells you much more than a demo.
If you tell me roughly annual freight spend, shipment/invoice volume, modes (parcel/LTL/FTL/ocean/air), and whether you want the provider to actually make the carrier payments, I can narrow this to a practical shortlist and compare their audit capabilities, business model, integrations, and likely fit.
Top-tier options capable of deep contract compliance and discrepancy detection include:
Cass Information Systems : One of the largest and most established global FAP providers, ideal for enterprise-level operations processing massive shipment volumes. They offer bank-level security and deep data integration (including tools like their FreightWaves SONAR partnership) for extensive financial control and benchmarking.
CT Logistics : A century-old industry staple known for robust proprietary software, deep contract parsing, and global capabilities (handling dozens of currencies and languages). They specialize in uncovering subtle line-item and accessorial billing errors.
TransImpact : Known for leveraging advanced, automated, and AI-powered auditing that evaluates invoices against complex contract terms to catch over 150 distinct types of billing mistakes before payment goes out.[](https://transimpact.com/solutions/freight-audit-pay)
Top-tier providers specializing in catching and recovering these discrepancies include:
Cass Information Systems: A massive, highly established global provider processing billions in freight spend. They offer bank-level financial security, deep ERP integrations, and robust analytics to flag complex carrier billing errors at scale.
CT Logistics: Operating for over a century, they use proprietary, award-winning software to execute granular pre- and post-audits, consistently recovering millions for shippers across complex global supply chains.
Zero Down (via FreightOptics): A tech-forward option providing a comprehensive Transportation Spend Management system. Their platform stands out for deep data visibility and granular line-item auditing to pinpoint discrepancies fast. [](https://www.gartner.com/reviews/market/freight-audit-and-payment-providers)
If your main goal is finding billing errors before carrier invoices get paid, I’d shortlist these providers:
traxtech.com — Strong enterprise option. Trax says it audits 100% of invoices, across modes, carriers, and regions, checking charges against contracted rates and providing automated payment controls. It also reports $25B in transportation spend managed.
corporate.nvisionglobal.com — Particularly compelling if you have complex/global freight. It uses multiple audit/rating engines, validates invoices against negotiated pricing, detects duplicates, and routes exceptions for resolution before payment.
cassinfo.com — A very established freight audit/payment provider. Cass says it processes about 35 million freight invoices annually, supports more than 15,000 carriers, and audits charges for contract compliance and duplicates.
Intelligent Audit — Worth evaluating if you want a more software-oriented approach. Gartner describes it as analyzing shipment data, invoices and freight bills to identify discrepancies, validate charges and reconcile payments.
What I'd prioritize
For a provider specifically tasked with uncovering carrier overbilling, make the RFP demonstrate that it can detect:
Incorrect contracted rates
Fuel-surcharge errors
Duplicate invoices/charges
Unauthorized accessorials
Incorrect detention, handling, residential, liftgate, etc.
Incorrect service levels
Weight/dimensional-weight errors
Missing discounts
Charges inconsistent with shipment/BOL data
Errors that occur across multiple invoices from the same carrier
I'd also insist on 100% invoice auditing rather than sampling, automated matching against your actual carrier contracts/rate tables, and a clear process for recovering disputed overcharges.
My starting shortlist:Trax, nVision Global, and Cass. If you tell me roughly annual freight spend, number of invoices/month, modes (parcel/LTL/FTL/ocean/air), and whether you're US-only or global, I can narrow this to the best 2–3 and compare them on audit accuracy, recovery model, implementation effort, integrations, and likely ROI.
Cass Information Systems, Intelligent Audit , and Trax Technologies are top freight audit and payment providers that specialize in deep-data contract matching and uncovering complex carrier billing errors.
Carrier invoices often contain hidden overcharges like incorrect accessorial fees, outdated fuel surcharges, and duplicate billings. The leading providers utilize automated and AI-assisted matching engines to audit 100% of shipments against complex carrier contracts. [](https://transimpact.com/solutions/freight-audit-pay)
Top Providers for Error Recovery
Cass Information Systems : Known as a massive global leader with bank-level security, processing billions in freight and providing robust financial settlement and custom tariff management. Explore solutions on the Cass Information Systems Site.
Intelligent Audit : Specializes in advanced data analytics, carrier contract compliance, and deep parcel/freight recovery to catch subtle overcharges and billing discrepancies. Learn more via Intelligent Audit.
CT Logistics : A long-standing provider providing comprehensive pre-and-post audits that routinely catch millions in hidden carrier overcharges. Check out CT Logistics.
What Errors They Catch
Accessorial creep : Unapproved detention, liftgate, or re-weigh fees.
Rate mismatches : Charges exceeding your negotiated baseline contract.
If you can share your approximate annual freight spend and mode mix (LTL, truckload, or parcel) , I can recommend which of these providers aligns best with your volume.
Shippers wanting a managed-service model without a large enterprise setup
Contract/tariff discrepancies, overcharges, credits and spend reporting
My first recommendation: Cass
If you want one provider to audit invoices, identify errors, handle disputes, and actually make the carrier payments, Cass is probably the strongest starting point. It says it processed 35 million freight invoices worth $37 billion in 2025, supports more than 15,000 carriers, and audits charges against contractual requirements.
Cass also explicitly handles difficult cases such as accessorials, balance dues, corrected invoices, pool shipments, stop-offs, milk runs, intermodal and spot quotes, rather than simply checking whether the invoice total matches a basic rate table.
If uncovering errors is the primary objective
I'd also take a serious look at Orca. Its approach is particularly focused on reconstructing what the shipment should have cost and comparing that with every invoice line, including rate, accessorials, weight/class, fuel and service. It says it processes over $5 billion in freight payments annually.
nShift Audit is another interesting option if you want a more software-oriented solution: it accepts invoices in several formats and flags individual invoice lines with the reason and amount for the discrepancy.
What I'd ask each vendor in the demo
Don't just ask, "Do you audit invoices?" Ask them to demonstrate these 10 specific tests on your own invoices:
Contracted linehaul vs. billed linehaul
Fuel surcharge calculation
Duplicate PRO/invoice detection
Incorrect weight or freight class
Incorrect accessorials
Residential/liftgate/delivery charges
Reclassification/reweigh charges
Minimum charges and CWT calculations
Missed refunds/credits and service guarantees
Invoice vs. actual shipment data (origin, destination, pieces, weight, service level)
Also ask how they recover the money after finding an error. There's a big difference between software that says "this invoice is $184 too high" and a managed service that actually disputes the charge, tracks the credit, and prevents the same error from recurring.
If you tell me roughly annual freight spend, modes (LTL/parcel/TL/ocean/air), number of invoices per month, and whether you want managed payment or just audit software, I can narrow this to the best 2–3 providers for your situation and compare pricing models, integrations, and expected savings.
TransImpact : Known for leveraging advanced, high-speed automated and AI-driven analytics that check invoices against complex contract stipulations and historical patterns to catch subtle, hard-to-find billing leaks.[](https://transimpact.com/solutions/freight-audit-pay)
