Substack archive API

Posts one Substack publication published, newest first by default, with reactions and restacks.

Ask your agent

“Call substack/archive with handle on.substack.com and summarize what comes back.”

Works in any MCP client connected to https://data.openkrill.app/mcp. Install in one line.

Path: substack/archive
MCP tool: call_endpoint
Credits: 1
Cache: 30 min

Parameters

handlestring, required	Publication name or host, such as on.substack.com
sortstring, optional	new or top, default new
limitinteger, optional	1-50 posts, default 12
offsetinteger, optional	Page offset, default 0

Response

data.resources[] uses the same keys as every other platform: author, engagement, metadata, with Substack-only fields under extras. A failed upstream call is never billed.

More Substack tools

post

MCP tool call

{
  "name": "call_endpoint",
  "arguments": {
    "path": "substack/archive",
    "params": {
      "handle": "on.substack.com"
    }
  }
}

curl

curl "https://data.openkrill.app/v1/substack/archive?handle=on.substack.com" \
  -H "x-api-key: YOUR_API_KEY"

Response

{
  "success": true,
  "platform": "substack",
  "endpoint": "substack/archive",
  "data": {
    "resources": [
      { "id": …, "title": …, "text": …, "url": …,
        "author": {…}, "engagement": {…},
        "metadata": {…}, "extras": {…} }
    ]
  },
  "credits_used": 1,
  "cached": false
}