Linen App

Linen Wallet, operated by Linen Mobile, Inc., was a mobile self-custody cryptocurrency wallet that used multi-signature protection built on Safe (formerly Gnosis Safe) smart-contract accounts instead of the single seed phrase used by most wallets. It began as a DeFi savings wallet earning yield on stablecoins through Compound, later adding Ethereum staking and Polygon support, and grew out of Bloqboard, a non-custodial digital-asset lending platform built on the Dharma, Compound and MakerDAO protocols. Linen was backed by Polychain, Coinbase Ventures, HashKey and Wyre, and won Aave and Polygon grants. The product is discontinued — since late 2023 every path on linen.app has returned a site-wide redirect to a single X post, and no documentation, developer portal, API or specification was ever published publicly. See lifecycle/linen-app-lifecycle.yml for the probed wind-down evidence.

Linen App is profiled on the APIs.io network. Tagged areas include Company, Wallets, Cryptocurrency, Ethereum, and DeFi.

🌐 Visit website 📡 Profile data on GitHub

0.0/100 minimal ▬ flat Agent 0/100 human only Front door AI 1/6 silent Heartbeat 0/100 dormant self hosted · Apache-2.0 Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs

Company Wallets Cryptocurrency Ethereum DeFi Self-Custody Multisig Blockchain Discontinued

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 0.0/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 0.0 / 9

Regulatory Posture 0.8 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 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 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Payments regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 0.0 — up to +20.0 composite points
Access Clarity scores 0.0 — up to +20.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/linen-app/apis.yml: open an issue on github.com/api-evangelist/linen-app to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Security Posture 1

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

Linen App Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Lifecycle

Lifecycle

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

SourceCode

SourceCode

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: linen-app
deliveryModel:
  model: self-hosted
  license: Apache-2.0
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  - url: https://linen.app
    status: 301
    note: declared website redirects to https://x.com/GetLinen/status/1719361452186710050 — a different registrable domain
      (linen.app -> x.com), possible rename or acquisition (probed 2026-09-03, roadmap#169)
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/linen-app.png
name: Linen App
description: Linen Wallet, operated by Linen Mobile, Inc., was a mobile self-custody cryptocurrency wallet that used multi-signature
  protection built on Safe (formerly Gnosis Safe) smart-contract accounts instead of the single seed phrase used by most wallets.
  It began as a DeFi savings wallet earning yield on stablecoins through Compound, later adding Ethereum staking and Polygon
  support, and grew out of Bloqboard, a non-custodial digital-asset lending platform built on the Dharma, Compound and MakerDAO
  protocols. Linen was backed by Polychain, Coinbase Ventures, HashKey and Wyre, and won Aave and Polygon grants. The product
  is discontinued — since late 2023 every path on linen.app has returned a site-wide redirect to a single X post, and no documentation,
  developer portal, API or specification was ever published publicly. See lifecycle/linen-app-lifecycle.yml for the probed
  wind-down evidence.
url: https://raw.githubusercontent.com/api-evangelist/linen-app/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- polychain
x-tier: stub
x-tier-reason: defunct-no-public-api
x-status: discontinued
x-legal-entity: Linen Mobile, Inc.
x-formerly: Bloqboard
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Wallets
- Cryptocurrency
- Ethereum
- DeFi
- Self-Custody
- Multisig
- Blockchain
- Discontinued
tags_raw:
- Company
- Wallet
- Cryptocurrency
- Ethereum
- DeFi
- Self Custody
- Multisig
- Blockchain
- Discontinued
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: IssueTracker
  url: https://github.com/linen-app/bloqboard-lending-wallet/issues
- type: License
  name: Apache-2.0
  url: https://github.com/linen-app/bloqboard-lending-wallet/blob/master/LICENSE
- type: Website
  url: https://linen.app
- type: GitHubOrganization
  url: https://github.com/linen-app
- type: SourceCode
  name: Bloqboard Lending Wallet
  url: https://github.com/linen-app/bloqboard-lending-wallet
- type: X
  url: https://x.com/GetLinen
- type: Lifecycle
  url: lifecycle/linen-app-lifecycle.yml
- type: DomainSecurity
  url: security/linen-app-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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