# GPT-5.6 Terra 100-Call Prepaid Pack Purchase

> GPT-5.6 Terra 100-Call Prepaid Pack Purchase is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $4/call, status unknown (last checked 2026-10-13).

Purchases a prepaid pack of 100 GPT-5.6 Terra chat API calls for $4 USDC via x402 payment protocol, returning a token for subsequent use.

## Facts

- Endpoint: GET https://gpt55.558686.xyz/v1/paid/call-packs/gpt-5.6-terra-100?utm_source=zero.xyz
- Price: $4/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gpt-5-6-terra-100-call-prepaid-pack-purchase-2518b5fc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1ek3688UfTBv2sMbQ6oi6

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 gpt-5-6-terra-100-call-prepaid-pack-purchase-2518b5fc
```

Example prompt: I want to buy a prepaid pack of 100 GPT-5.6 Terra chat API calls for $4 USDC so I can use them later without paying per request — go ahead and purchase the gpt-5.6-terra-100 call pack.

## When to prefer this

Choose this endpoint when you need to prepay for a block of 100 GPT-5.6 Terra completions at a discounted rate ($4 for 100 calls vs per-call pricing) and want to avoid per-request payment overhead. Prefer it over per-call endpoints when running agent loops, test suites, or apps with predictable usage volume. Not suitable if you only need a single completion or if you need a different model tier.

## Known failure modes

- Payment failure: x402 wallet lacks sufficient USDC balance, returns payment error
- Invalid pack ID: requesting a non-existent call pack returns 404 or error response
- Method mismatch: only GET/HEAD/DELETE accepted per schema; POST returns 405
- Token generation failure: upstream provisioning error returns ok:false with error details
- Network timeout: gateway unreachable, returns connection error

## How this service works

GPT-5.6 Luna API Base USDC and OpenAI-compatible x402 chat: one request for $0.00293, paid by browser wallet or a quote-first agent fallback.

## Output

Returns a JSON object with ok:true, a pack object containing the call pack ID, model name (gpt-5.6-terra), price ($4), title, a provisioned token (pk_test_***), a discount factor (0.8), exact USD price (3.99984), total call count (100), remaining calls (100), and a productId of 'model-call-pack'.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "additionalProperties": true
    },
    "queryParams": {
     "type": "object",
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "pack": {
   "id": "gpt-5.6-terra-100-call-pack",
   "model": "gpt-5.6-terra",
   "price": "$4.00",
   "title": "GPT-5.6 Terra 100 Prepaid Call Credits",
   "token": "pk_test_***",
   "discount": 0.8,
   "priceUsd": 3.99984,
   "callCount": 100,
   "remainingCalls": 100
  },
  "productId": "model-call-pack"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gpt-5-6-terra-100-call-prepaid-pack-purchase-2518b5fc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gpt55.558686.xyz](https://www.zero.xyz/host/gpt55.558686.xyz/llms.txt)