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Vouch is a trust infrastructure SDK built for developers who are tired of stitching together three separate vendors every time they launch a marketplace or B2B platform. Instead of managing a KYC provider, a fraud-scoring service, and a payments escrow layer independently, you get all three as first-class modules in a single TypeScript package — each backed by the same AI engine, sharing the same user context, and accessed through one consistent API.

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Why Vouch exists

Every marketplace faces the same trust problems: you need to know your users are who they claim to be, you need to catch bad actors before they cause damage, and you need a neutral way to hold funds until both sides of a transaction are satisfied. Solving these problems individually means multiple integration projects, multiple compliance reviews, and multiple failure surfaces. Vouch collapses that complexity into a single SDK so you can focus on your product instead of your plumbing.

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Core capabilities

Vouch exposes three modules that cover the full lifecycle of a trusted transaction.

Identity Verification

Launch a zero-click KYC modal or submit documents directly. Vouch runs liveness checks, document authentication, and AI-powered review — and returns a structured verification result.

Fraud Detection

Score any user action or transaction in real time. Vouch returns a GREEN, AMBER, or RED flag along with the signals that drove the decision, so you can act immediately.

Escrow Management

Create milestone-based escrow accounts, track their status, assess release readiness, and confirm payouts — all programmatically, without touching a payments dashboard.

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How it works

When you call any Vouch SDK method, the SDK serialises your request and sends it to the Vouch backend at https://vouch-fmql.onrender.com/v1 over HTTPS, authenticated with your API key. The backend routes the request to the appropriate AI engine — identity, fraud, or escrow — processes it, and returns a structured JSON response. You never communicate with the AI engine directly; the SDK and backend handle all of that on your behalf.
The SDK is stateless on the client side. Every method call is an independent HTTPS request, which means you can call Vouch from serverless functions, long-running servers, or edge runtimes without managing sessions or background workers.

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Requirements

Before you integrate Vouch, make sure your environment meets these prerequisites.
The vouch-sdk package is published as pure ESM. If your project uses CommonJS, configure your bundler (esbuild, Webpack, Rollup) to transpile ESM dependencies, or use a dynamic import() call.
Ready to integrate? Head to the Quickstart to install the SDK and make your first API call in under five minutes.