# Mainframe

> Mainframe (Mainframe Group, Inc.) is a software development and marketing services company
> building products for the decentralized finance (DeFi) ecosystem. It works across Risk
> Management (protocol parameter optimization and stability), Development (DeFi and blockchain
> financial solutions), and Marketing. Its portfolio products are Hifi, Pooled NFT, Sheet Heads,
> and Crown Ribbon.

GENERATED BY API EVANGELIST — Mainframe does not publish an llms.txt. Probed 2026-08-13:
www.mainframe.co/llms.txt and hifi.finance/llms.txt both return a soft-200 marketing/SPA HTML
shell (not a document); docs.hifi.finance/llms.txt returns 404. This file is derived from
apis.yml and the artifacts in this repository. See well-known/mainframe-well-known.yml for the
full probe record.

## What Mainframe does and does not publish

- There is NO REST API, NO OpenAPI or Swagger document, and NO developer portal on any
  Mainframe-controlled host. api.mainframe.co, docs.mainframe.co and developer.mainframe.co do
  not resolve (NXDOMAIN, checked 2026-08-13).
- www.mainframe.co is a three-page Webflow marketing site (`/`, `/contact-mainframe`,
  `/portfolio/crownribbon`), last published 2024-09-16.
- The GitHub organization github.com/MainframeHQ has 0 public repositories. Mainframe's public
  code lives in github.com/hifi-finance instead.
- The one machine-readable contract is the GraphQL schema of the Hifi Protocol subgraph.

## Developer surface

- [Hifi Protocol documentation](https://docs.hifi.finance/protocol/introduction): the protocol
  docs for Hifi, Mainframe's fixed-rate, fixed-term lending protocol. Footer reads
  "Copyright (c) 2025 Mainframe Group Inc."
- [Hifi SDK](https://docs.hifi.finance/protocol/developers/sdk): npm packages of Solidity
  contracts plus generated TypeChain/ethers.js bindings. A smart-contract SDK, not an HTTP client.
- [Hifi data access](https://docs.hifi.finance/protocol/developers/data): documents two paths —
  Multicall against the deployed contracts, and a GraphQL subgraph on The Graph.
- [Network addresses](https://docs.hifi.finance/protocol/developers/network-addresses): deployed
  contract addresses per network.

## GraphQL

- [Hifi subgraph schema](graphql/mainframe-hifi-subgraph-schema.graphql): the verbatim SDL, six
  `@entity` types — Position, Token, Hifi, Vault, Pool, Swap.
- [GraphQL manifest](graphql/mainframe-hifi-graphql.md): endpoint, provenance, and entity notes.
- Documented endpoint `https://thegraph.com/hosted-service/subgraph/hifi-finance/hifi` returned
  HTTP 404 on 2026-08-13. The Graph's hosted service is retired and Hifi's docs name no
  replacement, so the documented GraphQL surface is not currently callable.

## Packages

All under the npm `@hifi` scope; there is no `@mainframe` scope.

- `@hifi/protocol` 1.12.0 (2024-01-12) — core lending protocol contracts. BUSL-1.1.
- `@hifi/flash-swap` 1.13.0 (2024-01-12) — flash-swap liquidation for Uniswap V2 and forks.
- `@hifi/amm` 1.11.0 (2023-01-04) — dedicated AMM for market-making hTokens.
- `@hifi/proxy-target` 1.11.0 (2023-01-04) — DSProxy target with stateless scripts.
- `@hifi/react-tos-modal` 1.1.0 (2022-10-12) — React terms-of-service modal.
- [Full package record](packages/mainframe-packages.yml)

## Repositories

- [github.com/hifi-finance](https://github.com/hifi-finance) — 24 public repos; holds hifi
  (monorepo), hifi-subgraph, pooled-nft, and spreadsheet (Sheet Heads). Four of the standalone
  protocol repos are archived.
- [github.com/MainframeHQ](https://github.com/MainframeHQ) — 0 public repositories.

## Contact

- contact@mainframe.co
- https://www.mainframe.co/contact-mainframe

## Optional

- [Hifi interface](https://hifi.finance/)
- [Pooled NFT](https://poolednft.com/)
- [Sheet Heads](https://sheetheads.com/)
- [Crown Ribbon](https://www.mainframe.co/portfolio/crownribbon)