# x402 Retry-Safe Seller Playbook (quietstore)

> x402 Retry-Safe Seller Playbook (quietstore) is a paid API for AI agents from quietstore-production.edge-7e13f.workers.dev, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).

Returns a production playbook for safely charging AI agents over HTTP 402 (x402 protocol), covering retry safety, idempotency, cache rules, ambiguous-settle handling, and buyer recovery patterns on Base USDC.

## Facts

- Endpoint: GET https://quietstore-production.edge-7e13f.workers.dev/v1/packs/x402-retry-safe-seller-v1
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-retry-safe-seller-playbook-quietstore-17311c2c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rBh5MPzKPXlERmGJfQvCb

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 x402-retry-safe-seller-playbook-quietstore-17311c2c
```

Example prompt: Can you get me the x402-retry-safe-seller-v1 playbook from quietstore so I know the exact patterns for handling retries, ambiguous settles, and ledger idempotency when charging agents over HTTP 402 on Base USDC without double-billing?

## When to prefer this

Choose this endpoint when you need a concrete, production-tested reference for implementing an x402-compliant seller endpoint that safely handles agent retries and avoids double-billing. Prefer it over generic HTTP 402 documentation when you need Base USDC-specific patterns, ledger idempotency guidance, or buyer recovery message templates.

## Known failure modes

- Payment not received or 402 not resolved — endpoint returns 402 requiring USDC payment before content is served
- Invalid pack identifier — returns 404 if the pack name does not match a known playbook
- Network or worker error — Cloudflare edge worker may return 500 or 503 transiently
- Expired or stale payment facilitator — facilitator may reject payment if configuration is outdated

## How this service works

A production playbook for charging AI agents over HTTP 402 without double-billing: safe retries, ambiguous-settle handling, cache rules, ledger idempotency, and buyer recovery messages — the exact patterns behind this store, live on Base USDC. Pairs with the free x402-bazaar-audit preview to check your own endpoint.

## Output

A structured playbook document covering production-ready patterns for x402 HTTP 402 seller endpoints: safe retry handling, ambiguous-settle resolution, cache rules, ledger idempotency strategies, and buyer-facing recovery messages — all battle-tested on Base USDC.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-retry-safe-seller-playbook-quietstore-17311c2c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quietstore-production.edge-7e13f.workers.dev](https://www.zero.xyz/host/quietstore-production.edge-7e13f.workers.dev/llms.txt)