X (Twitter) Follow Relationship Checker

X (Twitter)

Operated by Sourcelane✓ verified

A utility that checks follow relationships on X (Twitter) between a specified source account and a list of target accounts. For each source/target pair it returns a tabular row containing whether the source follows the target, whether the target follows the source, a mutual-follow indicator, and a timestamp for when the check was performed. The connector operates without login to X and is designed for repeated runs to detect changes in follow status over time, producing structured, account-pair-level relationship data useful for mapping and analysis.

Verified Sep 28, 12:10 AM

$0.01

per check

Up to 100 per call. Only pay for results returned; failed calls are refunded.

What people use it for

"Does X follow Y" checks to determine if one account follows another
Unfollow audits to detect accounts that have stopped following by re-checking and diffing results
Influencer outreach qualification to see if prospects already follow a brand before outreach
Community and CRM enrichment by adding follow-relationship columns to contact or member lists
Mutual-follow mapping to identify which accounts in a list are mutuals with a key account

Trust & reliability

7d uptime trend

Window	Uptime	Success rate	p50	p95
24h	—	—	—	—
7d	—	—	—	—
30d	—	—	—	—

Calling contract

Call it through Sourcelane's gateway or MCP server. We run the connector, apply your agent's spend guardrails, and bill only the results returned.

Call it via Sourcelane

curl -X POST https://cool-puffin-608.convex.site/v1/call \
  -H "Authorization: Bearer sl_live_your_agent_key" \
  -H "Content-Type: application/json" \
  -d '{"listing":"x-follow-relationship-checker","params":{"sourceUsername":"elonmusk","targetUsernames":["jack","nasa","BillGates"]},"maxResults":10}'

Request params

Field	Type	Required	Description
`sourceUsername`	string	required	The X (Twitter) account whose follow relationships you want to check, with or without @.
`targetUsernames`	array	required	Target accounts to check against the source account, one per line. Each pair returns whether the source follows the target and vice versa.

Each result contains

Field	Type	Description
`sourceUsername`	string	Source Username
`targetUsername`	string	Target Username
`sourceFollowsTarget`	boolean	Source Follows Target
`targetFollowsSource`	boolean	Target Follows Source
`mutual`	boolean	Mutual
`checkedAt`	string	Checked At

Use X (Twitter) Follow Relationship Checker from Claude, ChatGPT or Cursor

Pick your tool and connect in under a minute. Then just ask — for example: “Find the 50 most-liked tweets about 'MCP servers' this month and summarise the takes.”

Connect Claude

Web, desktop and mobile. Paste one URL.

1Copy your personal connector URL
2In Claude open Settings → Connectors → Add custom connector
3Paste the URL and click Add — done

Manual setup (config files, REST, Python) +

Claude Code

Adds the Sourcelane MCP server with your key as a header.

terminal

claude mcp add --transport http sourcelane https://cool-puffin-608.convex.site/mcp \
  --header "Authorization: Bearer sl_live_your_agent_key"

Claude Desktop (config file)

Alternative to the connector URL: add to claude_desktop_config.json, then restart Claude.

claude_desktop_config.json

{
  "mcpServers": {
    "sourcelane": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://cool-puffin-608.convex.site/mcp",
        "--header",
        "Authorization:${AUTH_HEADER}"
      ],
      "env": {
        "AUTH_HEADER": "Bearer sl_live_your_agent_key"
      }
    }
  }
}

Cursor & Windsurf

Add to ~/.cursor/mcp.json (or Windsurf's mcp_config.json).

mcp.json

{
  "mcpServers": {
    "sourcelane": {
      "url": "https://cool-puffin-608.convex.site/mcp",
      "headers": {
        "Authorization": "Bearer sl_live_your_agent_key"
      }
    }
  }
}

VS Code

Save as .vscode/mcp.json. VS Code prompts for your key once.

.vscode/mcp.json

{
  "servers": {
    "sourcelane": {
      "type": "http",
      "url": "https://cool-puffin-608.convex.site/mcp",
      "headers": {
        "Authorization": "Bearer ${input:sourcelane-key}"
      }
    }
  },
  "inputs": [
    {
      "type": "promptString",
      "id": "sourcelane-key",
      "description": "Sourcelane agent key",
      "password": true
    }
  ]
}

ChatGPT Custom GPT (Actions)

Create a GPT → Actions → Import from URL, then Authentication: API Key, Bearer.

OpenAPI schema URL

https://sourcelane-amber.vercel.app/openapi.json

REST

One POST. Pass maxResults to cap cost.

curl

curl -X POST https://cool-puffin-608.convex.site/v1/call \
  -H "Authorization: Bearer sl_live_your_agent_key" \
  -H "Content-Type: application/json" \
  -d '{"listing":"x-follow-relationship-checker","params":{"sourceUsername":"elonmusk","targetUsernames":["jack","nasa","BillGates"]},"maxResults":10}'

Python, LangChain, CrewAI, OpenAI Agents SDK…

Wrap the REST call as a tool, or point an MCP client at the endpoint.

python

import requests

res = requests.post(
    "https://cool-puffin-608.convex.site/v1/call",
    headers={"Authorization": "Bearer sl_live_your_agent_key"},
    json={
        "listing": "x-follow-relationship-checker",
        "params": {"sourceUsername":"elonmusk","targetUsernames":["jack","nasa","BillGates"]},
        "maxResults": 10,
    },
    timeout=300,
)
body = res.json()
print(body["receipt"]["chargedMicros"], "micro-USD for", body["receipt"]["results"], "results")
print(body["data"])

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