# SSDF Rail Receipt Purchase

> SSDF Rail Receipt Purchase is a paid API for AI agents from www.ssdf.site, paid per call via x402, $1/call, status unknown (last checked 2026-09-15).

Purchases the SSDF Rail Receipt SKU from SSDF INC's digital store, settling $1 USDC on Base via Coinbase Business and minting a Passport NFT as proof of purchase.

## Facts

- Endpoint: GET https://www.ssdf.site/api/x402/ssdf-rail-receipt
- Price: $1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ssdf-rail-receipt-purchase-33bb18a2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jRekQXmvrNupYIBY3nJ0R

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-rail-receipt-purchase-33bb18a2
```

Example prompt: Buy me the SSDF Rail Receipt from the SSDF INC digital store — pay $1 USDC on Base and get back the Passport and fulfillment token.

## When to prefer this

Choose this endpoint when you specifically want to purchase the SSDF Rail Receipt SKU from SSDF INC's digital store using the x402 micropayment protocol, pay exactly $1 USDC settled on the Base blockchain via Coinbase Business, and receive a Passport NFT mint plus a fulfillment token as proof. Prefer this over generic payment endpoints when the agent needs on-chain Passport issuance as a side effect of purchase, or when building workflows that depend on x402-compatible digital storefronts on Base.

## Known failure modes

- Payment rejected or insufficient USDC balance — ok returns false or HTTP 402 re-issued
- Invalid or malformed x402 payment header — endpoint returns payment required error
- Base network congestion causing settlement delay — fulfillment token may be delayed
- Duplicate payment attempt — may result in a second Passport mint or idempotency error depending on server logic
- SKU unavailable or store configuration error — ok returns false with no passport or fulfillment

## 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 product identifier, e.g. 'ssdf-rail-receipt'), `passport` (the minted Passport ID tied to this purchase), and `fulfillment` (a URL path to retrieve the fulfilled digital item, e.g. '/api/fulfillment/{token}').

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ssdf-rail-receipt-purchase-33bb18a2/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)