# x402.monpham.work GPT-5.6 Terra Chat Completions

> x402.monpham.work GPT-5.6 Terra Chat Completions is a paid API for AI agents from x402.monpham.work, paid per call via x402, $0.025/call, status unknown (last checked 2026-10-30).

Runs chat completions via the GPT-5.6 Terra balanced frontier model (Intelligence Index 55.0), supporting multi-step reasoning, coding, and agentic tasks at mid-tier cost and capability.

## Facts

- Endpoint: GET https://x402.monpham.work/v1/terra/chat/completions?utm_source=zero.xyz
- Price: $0.025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-monpham-work-gpt-5-6-terra-chat-completions-8ef35b04
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_T_QL44dTV-3Y9AahLH6hP

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-monpham-work-gpt-5-6-terra-chat-completions-8ef35b04
```

Example prompt: Use the GPT-5.6 Terra model to answer this multi-step reasoning question with up to 2000 tokens: 'A factory produces widgets at 120 per hour but breaks down randomly — if downtime follows a Poisson distribution averaging 2 breaks per 8-hour shift each lasting 30 minutes, what is the expected daily output?'

## When to prefer this

Choose Terra over Luna when you need stronger multi-step reasoning, harder coding tasks, or higher benchmark performance (GPQA Diamond 92.5%) and Luna's capability is insufficient. Choose Terra over Sol when cost efficiency matters and you do not need Sol's maximum capability tier. Ideal for agentic pipelines that require mid-tier intelligence at $0.025 per call with a 16K input context window and OpenAI-compatible format.

## Known failure modes

- Input messages exceed 16,000 token limit — request rejected with token limit error
- max_tokens set above 4000 — capped or rejected
- Malformed messages array (missing role or content fields) — validation error
- Payment of $0.025 USDC not completed via x402 protocol — 402 Payment Required response
- Model ID does not match gpt-5.6-terra — may fall back to default or return error
- Temperature outside 0-2 range — validation error or unexpected outputs

## How this service works

GPT-5.6 Terra — balanced frontier model (Intelligence Index 55.0, GPQA Diamond 92.5%, Terminal-Bench Hard 57.6%). Best for everyday coding, multi-step reasoning, and agentic tasks needing more capability than Luna without Sol's cost. Limits: 16K input / 4K output tokens per call. OpenAI-compatible request and response format.

## Output

Returns an OpenAI-compatible chat completion object containing the assistant's generated message, finish reason, and token usage counts (prompt tokens, completion tokens, total tokens). Optionally streams tokens via SSE if stream is set to true.

## Request schema (JSON Schema)

```json
{
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-monpham-work-gpt-5-6-terra-chat-completions-8ef35b04/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.monpham.work](https://www.zero.xyz/host/x402.monpham.work/llms.txt)