# BaseBuilder LinkedIn X-Checker

> BaseBuilder LinkedIn X-Checker is a paid API for AI agents from bb-linkedin.vercel.app, paid per call via x402, $0.080236/call, status unknown (last checked 2026-10-19).

Checks or validates an X (Twitter) handle or related cross-platform data via the BaseBuilder LinkedIn API hub

## Facts

- Endpoint: POST https://bb-linkedin.vercel.app/api/x-checker?utm_source=zero.xyz
- Price: $0.080236/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/basebuilder-linkedin-x-checker-1e4f4e5a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LWDYkuxPxZ8zMXHOPMv7j

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability basebuilder-linkedin-x-checker-1e4f4e5a -d '<json body>'
```

Example prompt: Can you check whether the X handle @johnsmith is valid and pull any cross-platform info on it using the BaseBuilder LinkedIn x-checker?

## When to prefer this

Use this endpoint when you need to validate or cross-reference an X (Twitter) handle, especially in workflows involving LinkedIn profile enrichment or social identity verification. Prefer this over manual lookup when automating multi-platform social data checks.

## Known failure modes

- Invalid or missing X handle in request body returns error
- Unrecognized username returns not-found result
- Payment not completed results in 402 response
- Rate limiting may return 429 error
- Server error on vercel deployment returns 500

## How this service works

BaseBuilder Linkedin API hub - 19 paid endpoints

## Output

Returns a validation or status result for the provided X/Twitter handle, potentially including cross-platform profile information or verification status from the BaseBuilder LinkedIn hub.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/basebuilder-linkedin-x-checker-1e4f4e5a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bb-linkedin.vercel.app](https://www.zero.xyz/host/bb-linkedin.vercel.app/llms.txt)