# Registrai

> Registrai is a data company for the Arc blockchain (by Circle). Data on the Arc ecosystem: a directory of every project building on Arc with status and sources, apps on Arc with their hourly stablecoin payments, paying wallets and volume, the Arc Builders, Integrations and Ecosystem indices, and verified builders. The data lives on builder.registrai.cc.

## Data
- [Full reference](https://builder.registrai.cc/llms-full.txt): every project, the method, Arc in numbers and the question pages in one file
- [Arc in numbers](https://builder.registrai.cc/arc/): USDC and EURC supply on Arc, stablecoins and TVL, estimated 24 h volume, projects and a dated timeline; JSON at https://builder.registrai.cc/api/v1/arc
- [Methodology](https://builder.registrai.cc/methodology/): definitions of every figure (payments, paying wallets, received USD, index points, the 7-day window, directory statuses), sources, the attributed share and known limits
- [Most-used apps on Arc, last 7 days](https://builder.registrai.cc/arc/most-used-apps/): apps ranked by stablecoin payments received (USD), payments and new paying wallets; JSON at https://builder.registrai.cc/api/v1/arc/apps-week
- [Apps that accept USDC on Arc](https://builder.registrai.cc/arc/apps-that-accept-usdc/): payment apps with evidence of taking USDC on Arc mainnet, announced ones, and apps measured receiving stablecoin payments over 7 days (including swaps into DEXs and bridges)
- [New on Arc, last 30 days](https://builder.registrai.cc/arc/new/): projects that went live in the last 30 days (the latest launches when there are none) and apps added to Registrai's index in the last 7 days
- [How to get USDC onto Arc](https://builder.registrai.cc/arc/get-usdc/): on-ramps, exchanges and bridges for Arc, each with its evidence
- [Arc vs Ethereum vs Solana for stablecoin payments](https://builder.registrai.cc/arc/arc-vs-ethereum-vs-solana/): fee currency, measured block times, finality, estimated USDC transfer fees in USD and USDC in circulation per chain, each with its source
- [Arc ecosystem directory](https://builder.registrai.cc/ecosystem/): every project on Arc with category, status and sources; JSON at https://builder.registrai.cc/api/v1/ecosystem
- [AI answers about Arc](https://builder.registrai.cc/arc/ai-answers/): which pages ChatGPT, Claude, Gemini and Perplexity cite when asked about Arc, by edition
- [Apps built with Arc Studio](https://builder.registrai.cc/arc/studio/): apps built with Circle's Arc Studio that are public on GitHub, what each reached on Arc testnet and mainnet, the CLI and a changelog
- [Apps on Arc](https://builder.registrai.cc/apps/): every app with its last 24 h
- [Arc indices](https://builder.registrai.cc/builders-index/): ABI, AII, AEI, hourly
- [Data API v1](https://builder.registrai.cc/data-api/): public JSON API, no key, CC BY 4.0
- [Full agent guide](https://builder.registrai.cc/llms.txt): API, OpenAPI and MCP server

Licence: CC BY 4.0. Credit: "Registrai, builder.registrai.cc, CC BY 4.0".