# x402 API Key + URL Packs – Codex Key Pack 50

> x402 API Key + URL Packs – Codex Key Pack 50 is a paid API for AI agents from x402-key.558686.xyz, paid per call via x402, $5.5556/call, status down (last checked 2026-09-16).

Purchase a prepaid OpenAI-compatible API key and base URL quota pack (~$1 USD quota) via x402 micropayment, including optional GPT-5.6 Soul model access.

## Facts

- Endpoint: POST https://x402-key.558686.xyz/v1/paid/sub2api-codex-key-pack-50
- Price: $5.5556/call
- Payment: x402
- Status: down
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-api-key-url-packs-codex-key-pack-50-07cc3444
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ItfqrYVq2BNcIM5EMTD8b

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-api-key-url-packs-codex-key-pack-50-07cc3444 -d '<json body>'
```

Example prompt: Buy me a Codex Key Pack 50 from x402-key using buyer reference 'buyer-001' so I get an OpenAI-compatible API key and base URL with about $1 of quota.

## When to prefer this

Choose this endpoint when you need a small, prepaid OpenAI-compatible API key and base URL provisioned instantly via a single x402 micropayment, especially for disposable or per-task AI API access without a long-term subscription. Prefer over manual key management when operating in an automated agent context that can handle x402 payment flows.

## Known failure modes

- Payment not received or insufficient USDC — x402 payment challenge returned instead of key
- Invalid or missing buyer_reference query parameter — request rejected
- Upstream quota exhausted — key issued but with zero effective quota
- GPT-5.6 Soul model unavailable if upstream key does not permit it
- Network timeout or provider outage — no key returned

## How this service works

Buy a low-cost readiness check first, then buy a small OpenAI-compatible URL + API key quota pack through x402, including GPT-5.6 Soul access when your upstream key allows it. The readiness check returns URL, model, request-shape, and next-pack contract details without exposing a key.

## Output

Returns a JSON object containing: a masked and unmasked API key (sk-proj-...), base URL (https://sub2api.558686.xyz/v1), chat completions URL, models URL, quota in USD (integer), receipt evidence, and metadata about the tool/route/project.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "tool": "api-codex-key-pack-50",
  "input": {
   "buyer_reference": "buyer-001"
  },
  "route": "/v1/paid/sub2api-codex-key-pack-50",
  "result": {
   "apiKey": "sk-proj-...masked",
   "baseUrl": "https://sub2api.558686.xyz/v1",
   "quotaUsd": 1,
   "modelsUrl": "https://sub2api.558686.xyz/v1/models",
   "apiKeyMasked": "sk-proj-...masked",
   "receiptEvidence": {},
   "chatCompletionsUrl": "https://sub2api.558686.xyz/v1/chat/completions"
  },
  "project": "x402-key-url-tools",
  "deterministic": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-api-key-url-packs-codex-key-pack-50-07cc3444/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-key.558686.xyz](https://www.zero.xyz/host/x402-key.558686.xyz/llms.txt)