# SSDF ROS2 Protocol – Digital Purchase

> SSDF ROS2 Protocol – Digital Purchase is a paid API for AI agents from www.ssdf.site, paid per call via x402, $58/call, status unknown (last checked 2026-09-15).

Purchases the SSDF ROS2 Protocol digital product via a $58 USDC payment on Base, returning a Passport NFT and a fulfillment token for content access.

## Facts

- Endpoint: GET https://www.ssdf.site/api/x402/ssdf-ros2-protocol
- Price: $58/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ssdf-ros2-protocol-digital-purchase-75bda3a3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_P-lhj-qRn0nwWTKyGzzs5

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 ssdf-ros2-protocol-digital-purchase-75bda3a3
```

Example prompt: Buy the SSDF ROS2 Protocol from the SSDF digital store — pay the $58 USDC price on Base and get me the Passport and fulfillment link.

## When to prefer this

Use this endpoint when you need to programmatically purchase the SSDF ROS2 Protocol digital product, receive an on-chain Passport as proof of purchase, and obtain a fulfillment URL to access the content — all via a single $58 USDC payment over the x402 protocol on Base. Prefer this over manual checkout flows when an AI agent needs to autonomously acquire robotics protocol access without human interaction.

## Known failure modes

- Insufficient USDC balance — payment of $58 cannot be completed
- x402 payment protocol failure — Base network congestion or wallet misconfiguration
- Invalid or expired payment header — agent must re-initiate the x402 flow
- Fulfillment token generation failure — ok: false returned with no passport or fulfillment URL
- Network timeout on Base settlement — transaction may be pending

## How this service works

SSDF INC digital store. Priced in USD, settled in USDC on Base through Coinbase Business. Humans and agents buy the same SKU. Every settlement mints a Passport.

## Output

Returns a JSON object with: ok (boolean success flag), sku (the product identifier 'ssdf-ros2-protocol'), passport (a unique Passport ID minted on-chain upon purchase), and fulfillment (a URL path to retrieve the actual protocol content once payment is confirmed).

## Request schema (JSON Schema)

```json
{
 "properties": {
  "input": {
   "type": "object",
   "required": [],
   "properties": {}
  },
  "output": {
   "type": "object",
   "properties": {
    "ok": {
     "type": "boolean"
    },
    "sku": {
     "type": "string"
    },
    "passport": {
     "type": "string"
    },
    "fulfillment": {
     "type": "string"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "schema": {
  "type": "object",
  "properties": {
   "ok": {
    "type": "boolean"
   },
   "sku": {
    "type": "string"
   },
   "passport": {
    "type": "string"
   },
   "fulfillment": {
    "type": "string"
   }
  }
 },
 "example": {
  "ok": true,
  "sku": "ssdf-ros2-protocol",
  "passport": "{id}",
  "fulfillment": "/api/fulfillment/{token}"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ssdf-ros2-protocol-digital-purchase-75bda3a3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.ssdf.site](https://www.zero.xyz/host/www.ssdf.site/llms.txt)