# Northline Agent Eval Case Design Playbook

> Northline Agent Eval Case Design Playbook 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 a Markdown guide on designing evaluation cases for AI agents, covering methodology and best practices

## Facts

- Endpoint: GET https://206-81-14-131.sslip.io/svc/agent-eval-case-design-playbook/dl/agent-eval-case-design-playbook.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-agent-eval-case-design-playbook-a538aee1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fVh0L79ghleeb5yU5n2-u

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-agent-eval-case-design-playbook-a538aee1
```

Example prompt: Can you get me the agent eval case design playbook from Northline? I want a structured Markdown guide on how to design evaluation cases for AI agents — I'll pay the $0.25 USDC fee via x402.

## When to prefer this

Choose this endpoint when you need a ready-made, structured methodology document for AI agent evaluation case design, rather than building your own framework from scratch. Ideal for agent developers, QA teams, or researchers who want a downloadable, self-contained Markdown reference without needing an account or API key — just a one-time $0.25 USDC micropayment.

## Known failure modes

- Payment not provided or insufficient USDC balance on Base network returns HTTP 402
- Network or server unavailability returns a connection error
- Invalid or expired x402 payment token results in authentication failure
- File temporarily unavailable returns a 404 or 503 response

## 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 containing a playbook for designing evaluation cases for AI agents, including methodology, frameworks, best practices, and structured guidance for assessing agent performance and behavior.

## 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-agent-eval-case-design-playbook-a538aee1/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)