Bolt Threads

Bolt Threads, Inc. was a San Francisco Bay Area biomaterials company founded in 2009 to engineer protein- and mycelium-based materials. It is best known for Microsilk, a bioengineered spider-silk fiber; Mylo, a mycelium-derived leather alternative developed with partners including adidas, Kering, Lululemon, Patagonia and Stella McCartney; and b-silk protein, a silk-protein ingredient for beauty and personal care. The company went public on Nasdaq in August 2024 via a SPAC business combination under the ticker BSLK, halted Mylo production, was suspended from Nasdaq in January 2026, and now trades OTC Pink while deregistering with the SEC. Its website serves only a notice that the company is no longer operating. Bolt Threads was a materials manufacturer, not a software vendor, and never operated a developer program, public API, SDK, or machine-readable specification.

Bolt Threads is profiled on the APIs.io network. Tagged areas include Company, Biomaterials, Biotechnology, Materials Science, and Sustainability.

🌐 Visit website 📡 Source on GitHub

5.0/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Company Biomaterials Biotechnology Materials Science Sustainability Personal Care Textiles Defunct

Kin Score

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

Composite quality — 5.0/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 0.0 / 20

Access Clarity 0.0 / 20

Operational Transparency 0.3 / 13

Contract Governance 0.0 / 12

Discoverability 4.6 / 10

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

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.

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Resources

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

SecondaryMarket

SecondaryMarket

Source (apis.yml)

aid: bolt-threads
name: Bolt Threads
description: Bolt Threads, Inc. was a San Francisco Bay Area biomaterials company founded in 2009 to engineer protein- and
  mycelium-based materials. It is best known for Microsilk, a bioengineered spider-silk fiber; Mylo, a mycelium-derived leather
  alternative developed with partners including adidas, Kering, Lululemon, Patagonia and Stella McCartney; and b-silk protein,
  a silk-protein ingredient for beauty and personal care. The company went public on Nasdaq in August 2024 via a SPAC business
  combination under the ticker BSLK, halted Mylo production, was suspended from Nasdaq in January 2026, and now trades OTC
  Pink while deregistering with the SEC. Its website serves only a notice that the company is no longer operating. Bolt Threads
  was a materials manufacturer, not a software vendor, and never operated a developer program, public API, SDK, or machine-readable
  specification.
url: https://raw.githubusercontent.com/api-evangelist/bolt-threads/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: stub
x-tier-reason: harvest
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
specificationVersion: '0.23'
created: '2026-08-08'
modified: '2026-08-08'
tags:
- Company
- Biomaterials
- Biotechnology
- Materials Science
- Sustainability
- Personal Care
- Textiles
- Defunct
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://boltthreads.com/
- type: GitHubOrganization
  url: https://github.com/boltthreads
- type: SecondaryMarket
  url: https://forgeglobal.com/bolt-threads_stock/
x-enrichment:
  date: '2026-08-08'
  status: nochange
  artifacts_added: 0
  pass: local-v1
x-coverage:
  state: none
  reason: defunct
  detail: boltthreads.com now serves a single 1.4KB wind-down page reading "The Company is no longer operating" with a creditor-contact
    email at vlpc.com; api./developer./docs. subdomains do not resolve in DNS, and the boltthreads GitHub org holds 17 repositories
    that are all forks of third-party Ruby/JS open source, last pushed in 2020.
  evidence:
  - url: https://boltthreads.com/
    status: 200
  - url: https://boltthreads.com/developers
    status: 404
  - url: https://boltthreads.com/openapi.json
    status: 404
  - url: https://boltthreads.com/.well-known/agent-card.json
    status: 404
  - url: https://api.boltthreads.com/
    status: 0
  checked: '2026-08-08'

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