API Tools

factreason.com

Provides comprehensive third-party API discovery, schema lookup, breaking change alerts, and integration briefs to help developers safely and efficiently integrate external APIs.

2 endpoints20 known toolsFirst detected August 14, 2026Last detected August 14, 2026

ENDPOINT 1

https://factgrid.co.uk/mcp

No auth detected

MCP server metadata

Name: factreason
Version: 2.0.0

Capabilities

tools

Server instructions

FactReason provides verified reference data for AI agents: third-party API breaking changes and schemas, and electronics component specifications. Every key gets 50 free queries per day. Paid queries are billed per tier — see /pricing. Responses are Ed25519-signed and verifiable at /.well-known/jwks.json.

Known tools 10

factreason_package_upgrade_advisory

Before upgrading an npm or PyPI dependency, find out what breaks.

Inferred read-only

factreason_api_breaking_changes

TEMPORARILY OFFLINE for third-party APIs, pending revalidation - it returns no data and bills nothing.

Inferred read-only

factreason_api_schema

Look up the exact request and response shape of a third-party API endpoint at a specific version — parameter names, which are required, and their types.

Inferred read-only

factreason_integration_brief

Get everything needed to write ONE working call to a third-party API: base URL, authentication scheme, required parameters with types, request body shape, and documented response codes — in a single response.

Potential side effects

factreason_discover_api

Find WHICH third-party API can do something, across an index of over a thousand services.

Inferred read-only

factreason_create_topup_link

Create a secure Stripe checkout link to add prepaid credit to the calling API key.

Potential side effects

factreason_component_spec

Look up verified electronics component facts: pin-by-pin assignments, operating voltage range, package type, and drop-in alternative part numbers.

Potential side effects

factreason_deprecation_scan

Find WHICH endpoints or parameters of a third-party API are deprecated, sunset dates, and replacement operations.

Inferred read-only

factreason_auth_playbook

Get the authentication schemes, required scopes, declared rate-limit headers, and complete error code table for a third-party API.

Inferred read-only

factreason_subscribe_spec_changes

Subscribe to specification changes or demand auto-ingest updates for a third-party API.

Inferred read-only

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.factreason]
url = "https://factgrid.co.uk/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "factreason": {
      "type": "http",
      "url": "https://factgrid.co.uk/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: factreason
Remote MCP URL: https://factgrid.co.uk/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "factreason": {
      "url": "https://factgrid.co.uk/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "factreason": {
      "type": "http",
      "url": "https://factgrid.co.uk/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "factreason",
  "transport": "streamable-http",
  "url": "https://factgrid.co.uk/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

ENDPOINT 2

https://www.factreason.com/mcp

No auth detected

MCP server metadata

Name: factreason
Version: 2.0.0

Capabilities

tools

Server instructions

Known tools 10

factreason_package_upgrade_advisory

Before upgrading an npm or PyPI dependency, find out what breaks.

Inferred read-only

factreason_api_breaking_changes

TEMPORARILY OFFLINE for third-party APIs, pending revalidation - it returns no data and bills nothing.

Inferred read-only

factreason_api_schema

Look up the exact request and response shape of a third-party API endpoint at a specific version — parameter names, which are required, and their types.

Inferred read-only

factreason_integration_brief

Potential side effects

factreason_discover_api

Find WHICH third-party API can do something, across an index of over a thousand services.

Inferred read-only

factreason_create_topup_link

Create a secure Stripe checkout link to add prepaid credit to the calling API key.

Potential side effects

factreason_component_spec

Look up verified electronics component facts: pin-by-pin assignments, operating voltage range, package type, and drop-in alternative part numbers.

Potential side effects

factreason_deprecation_scan

Find WHICH endpoints or parameters of a third-party API are deprecated, sunset dates, and replacement operations.

Inferred read-only

factreason_auth_playbook

Get the authentication schemes, required scopes, declared rate-limit headers, and complete error code table for a third-party API.

Inferred read-only

factreason_subscribe_spec_changes

Subscribe to specification changes or demand auto-ingest updates for a third-party API.

Inferred read-only

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.factreason]
url = "https://www.factreason.com/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "factreason": {
      "type": "http",
      "url": "https://www.factreason.com/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: factreason
Remote MCP URL: https://www.factreason.com/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "factreason": {
      "url": "https://www.factreason.com/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "factreason": {
      "type": "http",
      "url": "https://www.factreason.com/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "factreason",
  "transport": "streamable-http",
  "url": "https://www.factreason.com/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

TRUST AND VERIFICATION EVIDENCE

Loading Trust v2 evidence…

Checking the associated registrable domain. The BuiltWith key remains server-side.

Indexed

Evidence is source-attributed and does not guarantee that a third-party server is safe. Risk labels are conservative metadata heuristics.