# SSDF Receipt Protocol

> SSDF Receipt Protocol is a paid API for AI agents from www.ssdf.site, paid per call via x402, $47/call, status unknown (last checked 2026-09-13).

Purchases the SSDF digital receipt SKU for $47 USDC on Base, returning a Passport token and fulfillment path upon successful payment settlement.

## Facts

- Endpoint: GET https://www.ssdf.site/api/x402/ssdf-receipt-protocol
- Price: $47/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ssdf-receipt-protocol-c8ec73e5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uA-BDeAePHI6mF17R06Kb

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-receipt-protocol-c8ec73e5
```

Example prompt: Buy the SSDF receipt protocol item from the SSDF INC digital store — pay the $47 USDC price and give me back the Passport token and fulfillment link.

## When to prefer this

Use this endpoint when you need to purchase the specific SSDF digital product SKU ('ssdf-receipt-protocol') and receive a blockchain-backed Passport token as proof of purchase, settled in USDC on Base via the x402 payment protocol. Prefer this over generic e-commerce APIs when the workflow requires both crypto payment settlement and identity/passport minting in a single call.

## Known failure modes

- Payment rejected or insufficient USDC balance — endpoint returns non-ok response or HTTP 402
- x402 payment header malformed or missing — request blocked before processing
- On-chain settlement failure on Base — transaction may time out
- Duplicate payment attempt — may return a new passport or idempotency error depending on server state
- Network timeout before fulfillment URL is returned — partial state possible

## 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 purchased SKU identifier, e.g. 'ssdf-receipt-protocol'), `passport` (a unique Passport token ID minted on settlement), and `fulfillment` (a path like /api/fulfillment/{token} to retrieve the purchased digital product).

## 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-receipt-protocol",
  "passport": "{id}",
  "fulfillment": "/api/fulfillment/{token}"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ssdf-receipt-protocol-c8ec73e5/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)