Mainframe

Mainframe (Mainframe Group, Inc.) is a software development and marketing services company building products for the decentralized finance (DeFi) ecosystem. It offers three service areas — Risk Management (protocol parameter optimization and stability), Development (DeFi and blockchain financial solutions), and Marketing (brand reach and audience engagement) — and has produced projects including Hifi, Pooled NFT, Sheet Heads, and Crown Ribbon. It was surfaced as a portfolio company of a16z and Techstars and added to the API Evangelist network. Mainframe itself publishes only a three-page Webflow marketing site, with no API host and no developer portal (api., docs. and developer.mainframe.co do not resolve), and its MainframeHQ GitHub organization has zero public repositories. Its developer surface lives under its Hifi product instead — the docs.hifi.finance protocol documentation (footer copyright "Mainframe Group Inc."), the github.com/hifi-finance organization, five first-party npm packages in the @hifi scope, and a GraphQL subgraph schema for the Hifi lending protocol. That surface is a smart-contract SDK rather than an HTTP API — there is no REST API and no OpenAPI anywhere — and it has gone quiet, with the newest package release dated 2024-01-12 and the documented GraphQL endpoint on The Graph's retired hosted service returning HTTP 404.

Mainframe publishes 1 API on the APIs.io network. Tagged areas include Company, DeFi, Blockchain, Web3, and NFT.

Mainframe’s developer surface includes documentation and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

19.6/100 emerging ▬ flat Agent 18/100 agent aware Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company DeFi Blockchain Web3 NFT Software Development Marketing Lending GraphQL Smart Contracts Subgraph Ethereum

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 19.6/100 · emerging

Contract Quality 9.1 / 25

Developer Ergonomics 3.3 / 20

Access Clarity 0.0 / 20

Operational Transparency 0.3 / 13

Contract Governance 0.0 / 12

Discoverability 6.9 / 10

Agent readiness — 18/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/mainframe: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Hifi Protocol Subgraph

The Graph subgraph that indexes the Hifi fixed-rate, fixed-term lending protocol — vaults, collateral and debt positions, listed bonds and collaterals, AMM pools and swaps — and...

GraphQL 1

GraphQL schemas published by this provider.

Mainframe / Hifi Protocol GraphQL

generated: '2026-08-13'

GRAPHQL

Pricing Plans 1

Published pricing tiers and plan structures.

Mainframe Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Mainframe Rate Limits

0 limits

RATE LIMITS

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Mainframe Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Build 3

SDKs, sample code, and the tooling you integrate with

Packages

Packages

SDKs

SDKs

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: mainframe
deliveryModel:
  model: unknown
  open_source: unknown
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - repository-unlicensed
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/mainframe.png
name: Mainframe
description: Mainframe (Mainframe Group, Inc.) is a software development and marketing services company building products
  for the decentralized finance (DeFi) ecosystem. It offers three service areas — Risk Management (protocol parameter optimization
  and stability), Development (DeFi and blockchain financial solutions), and Marketing (brand reach and audience engagement)
  — and has produced projects including Hifi, Pooled NFT, Sheet Heads, and Crown Ribbon. It was surfaced as a portfolio company
  of a16z and Techstars and added to the API Evangelist network. Mainframe itself publishes only a three-page Webflow marketing
  site, with no API host and no developer portal (api., docs. and developer.mainframe.co do not resolve), and its MainframeHQ
  GitHub organization has zero public repositories. Its developer surface lives under its Hifi product instead — the docs.hifi.finance
  protocol documentation (footer copyright "Mainframe Group Inc."), the github.com/hifi-finance organization, five first-party
  npm packages in the @hifi scope, and a GraphQL subgraph schema for the Hifi lending protocol. That surface is a smart-contract
  SDK rather than an HTTP API — there is no REST API and no OpenAPI anywhere — and it has gone quiet, with the newest package
  release dated 2024-01-12 and the documented GraphQL endpoint on The Graph's retired hosted service returning HTTP 404.
url: https://raw.githubusercontent.com/api-evangelist/mainframe/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
- techstars
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-08-13'
tags:
- Company
- DeFi
- Blockchain
- Web3
- NFT
- Software Development
- Marketing
- Lending
- GraphQL
- Smart Contracts
- Subgraph
- Ethereum
apis:
- aid: mainframe:hifi-subgraph
  name: Hifi Protocol Subgraph
  description: 'The Graph subgraph that indexes the Hifi fixed-rate, fixed-term lending protocol — vaults, collateral and
    debt positions, listed bonds and collaterals, AMM pools and swaps — and serves them over GraphQL. This is the only machine-readable
    contract Mainframe publishes; the schema is captured verbatim in graphql/. WARNING: the endpoint Hifi''s own documentation
    names is on The Graph''s retired hosted service and returned HTTP 404 when probed 2026-08-13, and the docs name no replacement,
    so the surface is documented but not currently callable.'
  humanURL: https://docs.hifi.finance/protocol/developers/data
  baseURL: https://thegraph.com/hosted-service/subgraph/hifi-finance/hifi
  tags:
  - GraphQL
  - Subgraph
  - The Graph
  - DeFi
  - Lending
  properties:
  - type: Documentation
    url: https://docs.hifi.finance/protocol/developers/data
  - type: Repository
    url: https://github.com/hifi-finance/hifi-subgraph
  - type: GraphQL
    url: graphql/mainframe-hifi-graphql.md
  - type: Schema
    url: graphql/mainframe-hifi-subgraph-schema.graphql
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: License
  name: LGPL-3.0
  url: https://github.com/hifi-finance/hifi-subgraph/blob/main/LICENSE
- type: DomainSecurity
  url: security/mainframe-domain-security.yml
- type: Website
  url: https://mainframe.co/
- type: Packages
  url: packages/mainframe-packages.yml
- type: SDKs
  url: packages/mainframe-packages.yml
- type: LLMsTxt
  url: llms/mainframe-llms.txt
- type: Documentation
  url: https://docs.hifi.finance/protocol/introduction
- type: GitHubOrganization
  url: https://github.com/hifi-finance
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 7
  pass: local-v1

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