> ## Documentation Index > Fetch the complete documentation index at: https://unevenlabs-scout-mar-1412-what-is-relay-rewrite.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # What is Relay? > The universal onchain payment rail for businesses Relay is the universal onchain payment rail. One integration lets any business accept payment in any token, on any of 85+ chains, and settle in the asset it runs on. The blockchain complexity disappears. Since launching in 2024, applications and users have completed **186M transactions** and **\$40B+ in volume** through Relay across **85+ chains**. Relay is two products on one stack: * **The Relay Platform:** the commercial layer you integrate through the API, SDK, deposit addresses, swaps, gasless execution, fee sponsorship, MEV protection, compliance screening, SLAs, and support. * **The Relay Protocol:** the open, permissionless crosschain settlement rail the Platform runs on. Anyone can build on it without commercial terms or permission. Relay supports a diverse set of use cases: Instant onboarding from any chain, in any token Same-chain and crosschain swaps at the best possible price Execute transactions on any chain and pay with any token To see Relay in action, try the [Relay App](https://relay.link/). To start building, check out the [Quickstart Guide](/references/api/quickstart). *** ## The Relay Stack ### Relay App **For anyone moving tokens across chains.** The fastest way from any token to any token, built on the same infrastructure that powers enterprise customers. [Try the App](https://relay.link/) ### Relay API **For developers and businesses building onchain payments.** One integration gives you access to 85+ chains: * **Accept payment** from any chain, in any token, with predictable fees * **Swap at the best price** through meta-aggregation across all major DEXs * **Ship payments-grade UX** with gasless execution, fee sponsorship, predictable rates, and SLAs Whether you're building wallets, exchange flows, merchant acceptance, or consumer apps, Relay makes crosschain payments fast, reliable, and invisible. [View Documentation](/references/api/overview) ### Relay Protocol **The open rail powering it all.** Permissionless crosschain settlement, designed for low costs, rapid chain expansion, and payments-grade reliability. [Learn More](/references/protocol/overview) *** ## Payments-Grade Payments-grade means meeting the reliability standard of modern payments, not simply being “crypto-native fast”: * **Speed:** sub-three-second settlement on supported routes * **Success rate:** high end-to-end success rates that keep payments moving * **Price:** predictable, competitive, and transparent * **Coverage:** one integration for every relevant chain and asset * **Support:** fast help when something goes wrong, backed by SLAs *** ## Trusted by Leading Teams OpenSea powers crosschain mints through Relay so collectors never have to worry about which chain they're on. Phantom collapses complex crosschain swaps into seamless flows. MetaMask, Coinbase, and 100+ other teams build on Relay across wallets, marketplaces, and payment platforms. Payroll, merchant acceptance, and exchange settlement all run on Relay today. *** ## Get Started **For users:** [Try the Relay App](https://relay.link/) to swap any token across any chain instantly. **For teams and developers:** use the [Quickstart Guide](/references/api/quickstart) to add crosschain payments to your app. Contact us about enterprise features, including dedicated support and custom SLAs.