> ## Documentation Index
> Fetch the complete documentation index at: https://sigma-docs.pastelhq.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Use Case

> Banking Fraud Prevention

### The Challenge

<div className="bg-white dark:bg-gray-800 p-6 rounded-lg shadow border-l-4 border-red-500 mb-8">
  <p>
    A banking institution processes{" "}
    <span className="font-bold">millions of transactions daily</span>, including
    deposits, withdrawals, and fund transfers. With the rise of sophisticated
    financial fraud, the bank needs a robust solution to detect and prevent
    fraudulent activities in real-time.
  </p>
</div>

### Our Solution

<div className="bg-blue-50 dark:bg-gray-900 p-6 rounded-lg shadow-md mb-8">
  <p className="dark:text-gray-200">
    Sigma Transaction Monitoring integrates seamlessly into the bank's core
    banking system, continuously monitoring all transactions and analyzing them
    for suspicious activities such as:
  </p>

  {" "}

  <div className="mt-4 space-y-2">
    <li className="flex items-start">
      <span className="text-blue-600 mr-2">→</span>
      <span>Unusual withdrawal patterns</span>
    </li>

    <li className="flex items-start">
      <span className="text-blue-600 mr-2">→</span>
      <span>Rapid fund transfers between multiple accounts</span>
    </li>

    <li className="flex items-start">
      <span className="text-blue-600 mr-2">→</span>
      <span>Attempts to circumvent security systems</span>
    </li>
  </div>

  <p className="mt-4">
    Sigma acts as a critical intermediary between banks and settlement system
    providers, ensuring that fraudulent transactions are detected and stopped
    before they are processed.
  </p>
</div>

### How It Works

<div className="relative bg-white dark:bg-gray-800 p-6 rounded-lg shadow-md mb-8">
  <div className="absolute top-0 right-0 w-24 h-24 bg-blue-100 rounded-bl-full -z-10" />

  <div className="flex flex-col space-y-6">
    <div className="flex items-center">
      <div className="bg-blue-600 text-white rounded-full w-8 h-8 flex items-center justify-center font-bold mr-4">
        1
      </div>

      <p>Customer initiates a transaction at the bank</p>
    </div>

    <div className="flex items-center">
      <div className="bg-blue-600 text-white rounded-full w-8 h-8 flex items-center justify-center font-bold mr-4">
        2
      </div>

      <p>Bank routes the transaction through Sigma for real-time fraud analysis</p>
    </div>

    <div className="flex items-center">
      <div className="bg-blue-600 text-white rounded-full w-8 h-8 flex items-center justify-center font-bold mr-4">
        3
      </div>

      <p>Sigma evaluates the transaction using AI-driven models and rules</p>
    </div>

    <div className="flex items-center">
      <div className="bg-blue-600 text-white rounded-full w-8 h-8 flex items-center justify-center font-bold mr-4">
        4
      </div>

      <p>Sigma provides a decision recommendation to the bank</p>
    </div>
  </div>
</div>

<img className="" src="https://mintcdn.com/pastelafrica/MhKZ6j7mW3E_SvBN/images/tm/flow.png?fit=max&auto=format&n=MhKZ6j7mW3E_SvBN&q=85&s=514b7f75599e5827021abf9193451517" style={{ borderRadius: "0.5rem" }} width="3968" height="3044" data-path="images/tm/flow.png" />

### Decision Outcomes

<div className="grid grid-cols-1 md:grid-cols-3 gap-6 mb-8">
  <div className="!bg-green-50 dark:!bg-green-800 p-6 rounded-lg border-t-4 border-green-500 shadow-md">
    <h3 className="text-green-700 dark:text-green-100 font-bold text-lg mb-2">
      Approve
    </h3>

    <p className="text-gray-700 dark:text-gray-200">
      If the transaction is deemed legitimate, Sigma recommends approval, and
      the bank forwards it to the settlement provider for processing.
    </p>
  </div>

  <div className="!bg-red-50 dark:!bg-red-800 p-6 rounded-lg border-t-4 border-red-500 shadow-md">
    <h3 className="text-red-700 dark:text-red-100 font-bold text-lg mb-2">
      Reject
    </h3>

    <p className="text-gray-700 dark:text-gray-200">
      If the transaction exhibits high fraud risk or violates a specific rule,
      Sigma advises rejection, preventing further processing.
    </p>
  </div>

  <div className="!bg-yellow-50 dark:!bg-yellow-700 p-6 rounded-lg border-t-4 border-yellow-500 shadow-md">
    <h3 className="text-yellow-700 dark:text-yellow-100 font-bold text-lg mb-2">
      Manual Review
    </h3>

    <p className="text-gray-700 dark:text-gray-100">
      If the transaction contains suspicious but inconclusive risk patterns,
      Sigma flags it for manual review by the bank's fraud team.
    </p>
  </div>
</div>

<div className="bg-white p-6 rounded-lg shadow-sm">
  <div className="grid grid-cols-1 md:grid-cols-2 gap-5">
    {[
            {
              title: "Real-Time Fraud Detection",
              description:
                "Detects and flags suspicious transactions instantly to prevent losses.",
              icon: (
                <path
                  fillRule="evenodd"
                  d="M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z"
                  clipRule="evenodd"
                />
              ),
            },
            {
              title: "AI-Powered Risk Scoring",
              description:
                "Uses machine learning models tailored to your bank’s transaction patterns.",
              icon: (
                <path
                  fillRule="evenodd"
                  d="M11.3 1.046A1 1 0 0112 2v5h4a1 1 0 01.82 1.573l-7 10A1 1 0 018 18v-5H4a1 1 0 01-.82-1.573l7-10a1 1 0 011.12-.38z"
                  clipRule="evenodd"
                />
              ),
            },
            {
              title: "Preemptive Blocking",
              description:
                "Stops fraud before settlement, reducing cleanup effort and customer impact.",
              icon: (
                <path d="M9 6a3 3 0 11-6 0 3 3 0 016 0zM17 6a3 3 0 11-6 0 3 3 0 016 0zM12.93 17c.046-.327.07-.66.07-1a6.97 6.97 0 00-1.5-4.33A5 5 0 0119 16v1h-6.07zM6 11a5 5 0 015 5v1H1v-1a5 5 0 015-5z"></path>
              ),
            },
            {
              title: "Audit & Manual Review",
              description:
                "Route edge cases for manual investigation through an integrated workflow.",
              icon: (
                <path
                  fillRule="evenodd"
                  d="M2.166 4.999A11.954 11.954 0 0010 1.944 11.954 11.954 0 0017.834 5c.11.65.166 1.32.166 2.001 0 5.225-3.34 9.67-8 11.317C5.34 16.67 2 12.225 2 7c0-.682.057-1.35.166-2.001zm11.541 3.708a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z"
                  clipRule="evenodd"
                />
              ),
            },
          ].map((item, idx) => (
            <div key={idx} className="flex items-start space-x-3">
              <div className="bg-blue-100 p-2 rounded-full">
                <svg
                  className="w-5 h-5 text-blue-600"
                  fill="currentColor"
                  viewBox="0 0 20 20"
                >
                  {item.icon}
                </svg>
              </div>
              <div>
                <h4 className="text-sm font-semibold">{item.title}</h4>
                <p className="text-xs text-gray-600">{item.description}</p>
              </div>
            </div>
          ))}
  </div>
</div>