# SSDF USDC Merchant Protocol

> SSDF USDC Merchant Protocol is a paid API for AI agents from www.ssdf.site, paid per call via x402, $55/call, status unknown (last checked 2026-09-15).

Purchases the SSDF digital store SKU via USDC on Base, returning a Passport NFT mint and a fulfillment token upon successful settlement.

## Facts

- Endpoint: GET https://www.ssdf.site/api/x402/ssdf-usdc-merchant-protocol
- Price: $55/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ssdf-usdc-merchant-protocol-7f1af0a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CM3AyXJx0ZFCYKKDy7Aon

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-usdc-merchant-protocol-7f1af0a0
```

Example prompt: Buy the SSDF digital store SKU using my USDC wallet on Base — I want to get the Passport and the fulfillment link after the $55 payment goes through.

## When to prefer this

Use this endpoint when you need to programmatically purchase a specific SSDF digital SKU, receive an on-chain Passport credential, and obtain a fulfillment URL — all settled atomically in USDC on Base via the x402 protocol. Prefer it over generic payment APIs when the downstream requirement is both a Passport mint and a fulfillment token from the SSDF store specifically.

## Known failure modes

- Insufficient USDC balance causes payment failure and no Passport is minted
- x402 payment header missing or malformed returns 402 Payment Required
- Network congestion on Base delays settlement confirmation
- Invalid or expired payment token returns a 400 or 402 error
- Fulfillment token may be single-use; replaying the same token will fail

## 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 string 'ssdf-usdc-merchant-protocol'), passport (a Passport ID minted on settlement), and fulfillment (a URL path to retrieve the fulfilled 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-usdc-merchant-protocol",
  "passport": "{id}",
  "fulfillment": "/api/fulfillment/{token}"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ssdf-usdc-merchant-protocol-7f1af0a0/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)