Onramp Kit brings fiat-to-USDC conversion in-app

@arc has opened its Onramp Kit to developers, giving applications a straightforward way to convert users' regular money into $USDC without redirecting them to a third-party site. The kit lets developers embed fiat-to-USDC funding flows with familiar payment methods like Apple Pay and debit cards, with built-in identity verification.

The move is part of a broader push by Circle to make stablecoin adoption frictionless at the point of entry. Arc App Kits enable stablecoin-powered apps with curated SDKs that simplify onchain development, allowing developers to add core financial functionality directly into their apps rather than stitching together custom integrations across wallets, protocols, and liquidity providers.

Powering the payment rails inside the Onramp Kit is Transak. Transak, used by more than 600 financial applications, is live on Arc as an on-ramp provider in the Arc Onramp Kit, giving developers a single integration for fiat-to-USDC onboarding through cards, Apple Pay, and Google Pay. Any team building on Arc can give its users a direct path from local currency into USDC using cards, Apple Pay, and Google Pay, without redirecting them to a separate site.

Flexible integration and real-time event tracking

Developers have two ways to plug in the kit. They can embed a hosted widget for a minimal-code setup, or work through SDK methods for deeper customisation. Either route includes built-in lifecycle events, so teams can track each stage of a user's funding flow from start to finish.

Alongside Onramp Kit, Earn Kit lets developers offer in-app earn opportunities through lending protocols like Morpho, while keeping the full user experience inside their application.

The Onramp Kit launch follows Circle's public mainnet debut of Arc on 16 September 2026. Arc is Circle's Layer-1 network using USDC as native gas, featuring sub-second finality and enterprise-grade infrastructure for stablecoin applications. Eleven institutional validators joined Circle initially, including BlackRock, DTCC, Visa, Mastercard, and Standard Chartered.

Sources
Arc Mainnet Is Here: The Economic OS for the Internet Is Now Live (arc.io)
Circle Arc Mainnet Launches with USDC Gas (crypto.news)
Transak Brings Fiat On-Ramps to Arc (bitcoinethereumnews.com)