# Saylor Innovations Guide Library — Building an AI Agent That Pays with x402

> Saylor Innovations Guide Library — Building an AI Agent That Pays with x402 is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-02).

Returns a guide article explaining how to build an AI agent that uses the x402 protocol to pay for data

## Facts

- Endpoint: GET https://saylorinnovations.com/api/kb/building-an-ai-agent-that-pays-with-x402?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-guide-library-building-an-ai-agent-that-pays-with-d784c9ca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IyKQPoCmLZpzTt9VKk_Up

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 saylor-innovations-guide-library-building-an-ai-agent-that-pays-with-d784c9ca
```

Example prompt: Pull up the Saylor Innovations guide on building an AI agent that pays for data using the x402 protocol — I want the full walkthrough article.

## When to prefer this

Choose this endpoint when you need a structured, machine-readable version of the x402 AI agent walkthrough article from Saylor Innovations, particularly for agentic workflows that need to ingest, summarize, or act on the guide content programmatically. It is best suited for developer agents researching x402 protocol implementation details.

## Known failure modes

- Article not found or URL path incorrect — may return an error or empty body
- Payment not processed correctly via x402 — 402 response requiring payment before content is delivered
- Service unavailable — network or provider-side error
- Content licensing restriction — license field may restrict reuse of returned content

## How this service works

Building an AI Agent That Pays for Data: A Practical x402 Walkthrough. A working implementation walkthrough for an AI agent consuming an x402-gated API: reading the 402 response and its accepts array, choosing a payment method (facilitator-settled transaction vs self-submitted reference), building the payment, and handling the settlement-lag retry loop — using this site’s own live Watchdog endpoints as the worked example.

## Output

A JSON object containing the article's unique ID, title (t), content type (c), full body text (body), and optional metadata including price and license. The body field contains the full text of the walkthrough article describing how to implement the x402 payment protocol in an AI agent context.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "id",
      "t",
      "c",
      "body"
     ],
     "properties": {
      "c": {
       "type": "string"
      },
      "t": {
       "type": "string"
      },
      "id": {
       "type": "string"
      },
      "body": {
       "type": "string"
      },
      "price": {
       "type": [
        "number",
        "null"
       ]
      },
      "license": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-guide-library-building-an-ai-agent-that-pays-with-d784c9ca/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)