SJSemi

SJSemi (SJSemiconductor (Jiangyin) Corp.) is a Chinese semiconductor Middle-End-Of-Line (MEOL) pure-play foundry and outsourced assembly and test (OSAT) provider, founded in 2014 as a joint venture between JCET and SMIC and headquartered in the Jiangyin High-Tech Industrial Development Zone, Jiangsu, with offices in Shanghai and Santa Clara, California. The company operates a 12-inch wafer bumping, wafer-level chip-scale packaging, chip probing and final-test line, and supplies advanced packaging and 3D multi-die integration services — Cu pillar, RDL, fan-out, TSV and silicon interposer 2.5D — into smartphone, 5G communications, high-performance computing, data-center and automotive electronics supply chains. It is a contract manufacturer of physical semiconductor packaging services and publishes no public developer program, API, or machine-readable interface contract.

SJSemi is profiled on the APIs.io network. Tagged areas include Company, Semiconductors, Hardware, Manufacturing, and Advanced Packaging.

SJSemi’s developer surface includes product news and 3 more developer resources.

🌐 Visit website 📡 Source on GitHub
5.4/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-09-01 · rubric v0.17.2
0 APIs
CompanySemiconductorsHardwareManufacturingAdvanced PackagingWafer TestOSATChina

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-01 · rubric v0.17.2
Composite quality — 5.4/100 · minimal
Contract Quality 0.0 / 25
Developer Ergonomics 0.0 / 20
Access Clarity 0.0 / 20
Operational Transparency 0.0 / 13
Contract Governance 0.0 / 12
Discoverability 5.4 / 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 Surface 0 / 5
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/sjsemi: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Security Posture 1

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

Sjsemi Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Company 2

The organization behind the API

Website
Website
 News
News

Source (apis.yml)

apis.yml Raw ↑ 
aid: sjsemi
name: SJSemi
description: SJSemi (SJSemiconductor (Jiangyin) Corp.) is a Chinese semiconductor Middle-End-Of-Line (MEOL) pure-play foundry
  and outsourced assembly and test (OSAT) provider, founded in 2014 as a joint venture between JCET and SMIC and headquartered
  in the Jiangyin High-Tech Industrial Development Zone, Jiangsu, with offices in Shanghai and Santa Clara, California. The
  company operates a 12-inch wafer bumping, wafer-level chip-scale packaging, chip probing and final-test line, and supplies
  advanced packaging and 3D multi-die integration services — Cu pillar, RDL, fan-out, TSV and silicon interposer 2.5D — into
  smartphone, 5G communications, high-performance computing, data-center and automotive electronics supply chains. It is a
  contract manufacturer of physical semiconductor packaging services and publishes no public developer program, API, or machine-readable
  interface contract.
url: https://raw.githubusercontent.com/api-evangelist/sjsemi/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: '0.20'
created: '2026-08-28'
modified: '2026-08-28'
tags:
- Company
- Semiconductors
- Hardware
- Manufacturing
- Advanced Packaging
- Wafer Test
- OSAT
- China
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/sjsemi-domain-security.yml
- type: Website
  url: https://en.sjsemi.com/
- type: News
  url: https://en.sjsemi.com/about/23368/
- type: LLMsTxt
  url: llms/sjsemi-llms.txt
x-enrichment:
  date: '2026-08-28'
  status: minimal
  artifacts_added: 3
  pass: local-v1
x-coverage:
  state: none
  reason: not-a-software-company
  detail: SJSemi is a contract semiconductor manufacturer — a 12-inch MEOL bumping, wafer-test and advanced-packaging foundry
    — whose corporate site carries only HOME / ABOUT US / SERVICE / SCM / JOIN US / CONTACT US, with no developer, API, or
    customer-portal section anywhere on it, and whose hosts return 404 for /openapi.json, every /.well-known/ path, robots.txt
    and sitemap.xml.
  evidence:
  - url: https://en.sjsemi.com/
    status: 200
  - url: https://en.sjsemi.com/openapi.json
    status: 404
  - url: https://en.sjsemi.com/.well-known/agent-card.json
    status: 404
  - url: https://en.sjsemi.com/.well-known/api-catalog
    status: 404
  - url: https://www.sjsemi.com/robots.txt
    status: 404
  checked: '2026-08-28'

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