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

5.3/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-17 · rubric v0.11.0

0 APIs

CompanyBiomaterialsBiotechnologyMaterials ScienceSustainabilityPersonal CareTextilesDefunct

Kin Score

Kin Score How this is scored →
scored 2026-08-17 · rubric v0.11.0

Composite quality — 5.3/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 0.0 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 0.7 / 13

Governance 0.0 / 12

Discoverability 4.6 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

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

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/bolt-threads: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

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
specificationVersion: '0.20'
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'