476 sources live// Agents first · people welcome

The world's open data,
checked and ready to call.

Signal Lab is the open data catalog for people and AI agents. Every source has its licence, limits and evidence checked, a Signal Score, and one MCP endpoint that any agent can call.

Browse the catalog Connect an agent

fig. 01 — the beacon, written in source names

Sources: 476
Domains: 11
Need no key: 413
Open licence: 161
Evidence links: 1,539

// 01 / I// Two readers, one record

Written for people.
Parsed by agents.

Every fact on a Signal Lab page is the same fact an agent receives — same field, same value, same evidence. Hover a row to see its twin.

// For peoplerendered page

National Weather Service API (api.weather.gov)

United States and its territories where NWS offices issue products.

Domain: Weather
Access: none; User-Agent header required
Limits: Not stated. NWS says the rate limit is not public information.
Licence: Public domain (custom terms)
Verified: 2026-10-30
Evidence: 3 source pages checked
Signal Score: 85 / 100

// For agentsget_entry → JSON

{
  "domain": "Weather",  "auth": "none; User-Agent header required",  "rateLimits": "Not stated. NWS says the rate limit is not public information.",  "license": "Custom",  "lastVerified": "2026-10-30",  "evidenceUrls": [3 urls],  "signalScore": 85}

// 02 / II// Eleven domains

From central banks to ship transponders.

Each domain has a three-letter code that follows a source everywhere — the catalog, the score card and the agent reply.

// 03 / III// Signal Score

A number you can
trace to its evidence.

Five checks, twenty points each, computed only from what we verified at the source. No paid placement changes a score.

Example

National Weather Service API (api.weather.gov)

WTH

Access: No key · none; User-Agent header required; 20
Licence clarity: Custom · terms linked; 13
Evidence: 3 source links checked; 15
Freshness: verified 2026-10-30; 20
Documentation: docs · limits · coverage · attribution; 17

Draft model Weights are a proposal for review.

Highest scoring nowcatalog average 83

// 04 / IV// For agents

One endpoint.
No key. Every source.

A public MCP server, listed in the official registry as io.github.QDThead/signal-lab. Ten tools; all read-only except two that only queue a suggestion for review.

Connect · Claude Code

claude mcp add --transport http signal-lab \
  https://signal-lab-jet.vercel.app/api/mcp

Call · search_catalog

{
  "jsonrpc": "2.0", "id": 1, "method": "tools/call",
  "params": {
    "name": "search_catalog",
    "arguments": { "query": "weather", "auth": "none" }
  }
}

Discoverable by design

Provider sites and their data are third-party and untrusted. Catalog text is screened for injection-style content before it is published, and every reply carries the provider's terms.

// 05 / V// For data providers

Have data worth finding?
We host, score and sell it.

Soon, commercial providers can list their catalogs next to the open ones: scored with the same method, discoverable by the same agents.

Host

Your catalog lives on Signal Lab, with pages for people and records for agents, kept in sync with your source.

Score

The same five checks as every open source. A partner listing never buys points — that is why the score is worth showing.

Market

Reach agents where they look for data: MCP search, llms.txt and the registry. See which agents read your listing.

List your data Partner listings · coming soonLatest verification 2026-11-09

The world's open data,checked and ready to call.

National Weather Service API (api.weather.gov)

The world's open data,
checked and ready to call.