# Synthex Forge x402 eBook Download

> Synthex Forge x402 eBook Download is a paid API for AI agents from x402.synthexforge.com, paid per call via x402, $29/call, status unknown (last checked 2026-10-23).

Downloads a paid PDF eBook ('x402-The-Agent-Economy.pdf') via atomic USDC micropayment on Base mainnet using the x402 payment protocol.

## Facts

- Endpoint: GET https://x402.synthexforge.com/api/ebook/download?utm_source=zero.xyz
- Price: $29/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthex-forge-x402-ebook-download-ca9c32d5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZvyskvPvdTQ0S4Ph1FUBk

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 synthex-forge-x402-ebook-download-ca9c32d5
```

Example prompt: Can you download the x402 Agent Economy PDF from Synthex Forge for me? It costs $29 USDC and I want the full 121-page ebook.

## When to prefer this

Use this endpoint when an agent needs to programmatically purchase and retrieve a specific PDF eBook about the x402 agent economy protocol using atomic USDC micropayments on Base mainnet. It is purpose-built for x402 protocol-native content delivery, making it ideal for agents operating in Web3 or agentic payment infrastructures rather than traditional subscription or OAuth-gated content systems.

## Known failure modes

- HTTP 402 returned if payment has not been submitted or is invalid — requires valid x402 v2 payment-required envelope
- Payment rejected if USDC amount is insufficient ($29 required)
- Chain ID mismatch if payment is not on Base mainnet (8453)
- Signature verification failure if Ed25519 or SHA-256 artifact is invalid
- Timeout if Base mainnet transaction confirmation is slow
- File unavailable if server-side asset is missing or endpoint is misconfigured

## How this service works

Synthex Forge x402 Receive: 41 paid verification, attestation and governance endpoints (Ed25519 + SHA-256 signed artifacts) plus free verify/public-key/standard sibling routes. Paid routes answer HTTP 402 with an x402 v2 `payment-required` envelope (atomic USDC on Base mainnet, chain ID 8453). Free routes are declared with `security: []` per the x402scan discovery spec.

## Output

Returns a JSON response containing the filename ('x402-The-Agent-Economy.pdf'), MIME type ('application/pdf'), and page count (121), along with the PDF file content — delivered after successful USDC payment settlement on Base mainnet (chain ID 8453).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "file": "x402-The-Agent-Economy.pdf",
  "mime": "application/pdf",
  "pages": 121
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthex-forge-x402-ebook-download-ca9c32d5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.synthexforge.com](https://www.zero.xyz/host/x402.synthexforge.com/llms.txt)