# Northline x402 Service Launch Kit Documentation Download

> Northline x402 Service Launch Kit Documentation Download is a paid API for AI agents from 206-81-14-131.sslip.io, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-02).

Downloads the x402-service-launch-kit markdown guide — a technical reference for building and deploying pay-per-call API services using the x402 payment protocol on Base/USDC

## Facts

- Endpoint: GET https://206-81-14-131.sslip.io/svc/x402-service-launch-kit/dl/x402-service-launch-kit.md?utm_source=zero.xyz
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/northline-x402-service-launch-kit-documentation-download-12cbdcd1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6SRJyDVSRoDadG8zWtz-b

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 northline-x402-service-launch-kit-documentation-download-12cbdcd1
```

Example prompt: Download the x402 service launch kit markdown guide from Northline — I need the full documentation on how to build and deploy a pay-per-call API using the x402 protocol with USDC on Base.

## When to prefer this

Choose this endpoint when you need the official technical reference document for implementing x402 pay-per-call APIs, particularly when building services that accept USDC micropayments on Base. Prefer this over generic web searches when you want the authoritative, versioned launch kit document directly from the Northline catalog.

## Known failure modes

- Payment not received or insufficient USDC balance — returns 402 Payment Required
- Network or server unavailability — returns 5xx error
- Malformed x402 payment header — payment rejected
- USDC not on Base network (eip155:8453) — payment invalid

## How this service works

Pay-per-call APIs, paid downloads and work-on-request for agents. Payment: x402 (USDC on Base, eip155:8453), no accounts or API keys. Catalog: https://206-81-14-131.sslip.io/?format=json. Agent guide: https://206-81-14-131.sslip.io/llms.txt

## Output

A markdown-formatted document (.md) containing the x402 Service Launch Kit — a technical guide covering how to build, configure, and deploy pay-per-call API services using the x402 payment protocol with USDC on the Base blockchain network. The file is returned as text/markdown with UTF-8 encoding.

## Response schema (JSON Schema)

```json
{
 "type": "file",
 "format": "text/markdown; charset=utf-8"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/northline-x402-service-launch-kit-documentation-download-12cbdcd1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 206-81-14-131.sslip.io](https://www.zero.xyz/host/206-81-14-131.sslip.io/llms.txt)