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

# Commerce & Payments

> Use Relay to facilitate seamless payments between users and merchants across any chain

Relay is crosschain payments infrastructure that enables seamless payments between users and merchants. Users pay in any token on any chain. Merchants configure exactly which token they receive as settlement — any stablecoin, native asset, or token on any supported chain. One integration to facilitate it all — instant, transparent, and low-fee.

<Columns cols={4}>
  <Card title="85+ Chains" icon="link">
    Connect users on every major network
  </Card>

  <Card title="< 3s Settlement" icon="bolt">
    P50 fill time across all routes
  </Card>

  <Card title="$20B+" icon="chart-line">
    Volume enabled to date
  </Card>

  <Card title="100M+ Txs" icon="receipt">
    Processed across the network
  </Card>
</Columns>

## Watch a Live Demo

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  <iframe className="w-full aspect-video rounded-xl" src="https://www.youtube.com/embed/nW7t-1aNmHY" title="YouTube video player" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowFullScreen />
</Frame>

## Who Builds with Relay

**Payment processors** — Add crosschain acceptance to your payment stack through a single integration. Rather than building 85+ chain connections, use Relay as the crosschain layer to connect your merchants with users on any network.

**Wallets and neobanks** — Let your users pay merchants directly from their existing holdings on any chain. No bridging, no chain-switching. One tap to pay, regardless of what chain the user or merchant is on.

**Commerce platforms** — Give your merchants onchain payment acceptance without requiring buyers to hold specific assets on specific chains. Connect any buyer to any merchant across the entire onchain ecosystem.

## Integration Paths

### Connected Wallet Checkout

For applications where users connect a wallet directly — web apps, mobile apps, or embedded wallets. Use the standard Relay [execute flow](/references/api/api_core_concepts/step-execution) with `tradeType: EXACT_OUTPUT` to guarantee merchants receive the exact amount requested.

Users connect their wallet, review the transaction, and confirm. Relay handles crosschain routing in the background. Compatible with all major wallet providers.

### Deposit Addresses

For flows where no wallet connection is needed. Generate a unique [deposit address](/features/deposit-addresses) per transaction and present it as a QR code, payment link, or in an invoice. Users send funds from any wallet on any chain, and Relay routes settlement to the merchant.

## Commerce Features

**[Exact Output Settlement](/references/api/api_core_concepts/trade-types)** — Use `tradeType: EXACT_OUTPUT` to guarantee merchants receive precisely the configured amount. No slippage, no shortfalls. If the exact amount cannot be filled, the transaction reverts and the user is refunded on the origin chain. This eliminates partial payment edge cases and removes the need for reconciliation logic.

**[Fee Sponsorship](/features/fee-sponsorship)** — Cover destination chain fees for users to create a frictionless checkout experience. Set a `maxSubsidizationAmount` to cap your exposure.

**[Sponsored Execution](/features/sponsored-execution)** — Submit transactions on behalf of users and cover gas costs entirely. Users sign a payload — your platform handles submission. Works with Permit2, ERC-4337 smart accounts, and EIP-7702, making payments completely gasless for end users.

**[App Fees](/features/app-fees)** — Collect a fee on every transaction that flows through your platform. Fees are automatically settled in USDC on Base.

**[Transaction Tracking](/references/api/get-requests)** — Monitor all transactions through the Relay [Request API](/references/api/get-requests). Track status, amounts, routes, and settlement in real time via API or [WebSockets](/references/api/api_guides/websockets).

## What You Build on Top

Relay provides crosschain routing, settlement guarantees, deposit addresses, real-time status tracking, and exact output fills. Relay does not include a merchant management system, order management, or invoicing — it empowers you to build these solutions on top.

* Merchant onboarding and management
* Order IDs and payment lifecycle management
* Checkout UI and product catalog
* Payment confirmation and receipts
* Invoicing and subscription logic

## Trusted by Leading Teams

Relay powers crosschain transactions for MetaMask, OpenSea, Coinbase, and other leading platforms. The protocol operates with 99.9%+ transaction reliability across 85+ networks with sub-3-second settlement on most routes.

## Get Started

Add crosschain payments to your platform through a single integration. Whether you are building a wallet checkout, a scan-to-pay flow, or a full payment processing layer, the [Quote API](/references/api/get-quote-v2) is the primary interface. Check out the [Quickstart Guide](/references/api/quickstart) to get started, or [reach out](https://forms.gle/XNeELYavjwoJwPEf7) to discuss your use case.