# TLS JA4 Fingerprinter

> TLS JA4 Fingerprinter is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.12/call, status unknown (last checked 2026-10-20).

Computes JA4 TLS fingerprints from raw TLS client hello data or connection metadata

## Facts

- Endpoint: POST https://api.m2mcent.com/tls-ja4-fingerprinter-mcp/api/process?utm_source=zero.xyz
- Price: $0.12/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tls-ja4-fingerprinter-0bfed912
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KBVw1z9K_5mqk0yBndulg

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 tls-ja4-fingerprinter-0bfed912 -d '<json body>'
```

Example prompt: Can you compute the JA4 TLS fingerprint for this raw TLS client hello data: '0303abcd1234...' and tell me what client signature it produces?

## When to prefer this

Use this endpoint when you need to compute JA4 TLS fingerprints programmatically as part of a security pipeline, bot detection system, or network traffic analysis workflow. Prefer it over manual parsing when you need fast, structured fingerprint output from raw TLS handshake data without maintaining your own fingerprinting library.

## Known failure modes

- Invalid or malformed TLS data string returns an error
- Empty or missing 'data' field causes validation failure
- Non-TLS binary data passed as input may return an unexpected or null fingerprint
- Truncated TLS client hello may result in partial or failed fingerprint extraction

## How this service works

The premier global index of 1,069 monetized MCP nodes across 205 specialized subdomains. Gasless USDC runtime settlements via x402 V2 Spec on Base L2. Save 95% token context.

## Output

Returns a JA4 TLS fingerprint string derived from the input TLS data, including the structured hash that encodes TLS version, cipher suites, extensions, and ALPN values in the JA4 format (e.g. 't13d1516h2_8daaf6152771_b0da82dd1658').

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tls-ja4-fingerprinter-0bfed912/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.m2mcent.com](https://www.zero.xyz/host/api.m2mcent.com/llms.txt)