sg-connectors

By Lobang Scout — practical, evidence-backed connectors for Singapore SMEs.

Free, no-auth MCP connectors that let Claude reach the Singapore data surfaces an SME actually uses. Closing the gap our evaluation kept hitting: most of those surfaces have no connector.

Connector	Server	Source	Auth
Company / UEN lookup	sg-company-lookup	ACRA open data (data.gov.sg)	None
Address / postal code	sg-onemap	OneMap (SLA)	None (optional free token)

Tools

sg-company-lookup

Tool	What it does	Network
validate_uen	Check a UEN's format against the 3 official patterns	No (offline)
lookup_company	Exact lookup by UEN	Yes
search_companies	Free-text search by name	Yes

sg-onemap

Tool	What it does
lookup_postal_code	Resolve a 6-digit SG postal code to address + coordinates
search_address	Free-text address / building / road search

Honest scope

These are built on free government open data. Be clear about the limits:

Company / UEN (ACRA open dataset):

• Returns: UEN, entity name, type, registration status, UEN issue date, street name, postal code, issuance agency.
• Monthly snapshot — not real-time. A struck-off entity may still show Registered.
• No officers, directors, shareholders, financials, paid-up capital, SSIC activity, or full address. Those need the paid ACRA Business Profile API (Corppass + EIQ) or a ~S$5.50 Bizfile profile.
• validate_uen confirms format only — ACRA's check-letter algorithm is undisclosed.

Address (OneMap):

• Singapore addresses only. Returns block, road, building, full address, postal code, WGS84 lat/long, and SVY21 x/y.
• The Search API is free; OneMap may require a free token in future (set ONEMAP_TOKEN).

For anything statutory or real-time, verify at the source (Bizfile, OneMap). These connectors are for fast, free first-pass lookup — not the system of record.

Install

Into Claude via uvx (no clone needed)

Add to your .mcp.json (or your plugin's). Runs straight from this repo:

{
  "mcpServers": {
    "sg-company-lookup": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/Lobang-Scout/sg-connectors", "sg-company-lookup"],
      "env": { "DATAGOV_API_KEY": "${DATAGOV_API_KEY}" }
    },
    "sg-onemap": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/Lobang-Scout/sg-connectors", "sg-onemap"]
    }
  }
}

Local clone (development)

python3.12 -m venv .venv
.venv/bin/pip install -e ".[dev]"
.venv/bin/sg-company-lookup    # or: .venv/bin/sg-onemap

Optional: raise the rate limit (company lookup)

Without a key, data.gov.sg allows 4 requests / 10s. A free API key lifts this to 20/10s. export DATAGOV_API_KEY=... before launching Claude. Request a key at guide.data.gov.sg.

UEN formats (what validate_uen checks)

Format	Shape	Entity
A	nnnnnnnnX	Business (sole-prop / partnership)
B	yyyynnnnnX	Local company (yyyy = incorporation year)
C	TyyPQnnnnX	Other entity (prefix T/S/R, PQ = 2-letter type)

Tests

.venv/bin/python -m pytest -q

Network is mocked in tests — no live calls in CI.

Data sources & licence

• Company data: ACRA via data.gov.sg, under the Singapore Open Data Licence.
• Address data: OneMap (Singapore Land Authority).

This connector is an independent tool, not affiliated with or endorsed by ACRA, SLA, or GovTech. Code under MIT (see LICENSE).