# xx402 BTC 15-Minute Prediction Market Calibration Slice

> xx402 BTC 15-Minute Prediction Market Calibration Slice is a paid API for AI agents from x402.xx402.icu, paid per call via x402, $0.01/call, status down (last checked 2026-10-23).

Returns calibration data and signal buckets for resolved Bitcoin 15-minute Up/Down prediction markets to help agents assess market quality and decide whether to participate.

## Facts

- Endpoint: GET https://x402.xx402.icu/api/btc15-calibration-slice?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/xx402-btc-15-minute-prediction-market-calibration-slice-e005305a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OFkxlCzR6y0iZ-7EBzrDJ

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 xx402-btc-15-minute-prediction-market-calibration-slice-e005305a
```

Example prompt: Pull the BTC 15-minute prediction market calibration slice looking at the last 120 resolved markets, with up to 24 sample rows, and only include final-window snapshots taken within the last 60 seconds — I want to see the signal buckets, risk breakdown, and the calibration decision.

## When to prefer this

Choose this endpoint when an AI agent or risk tool needs to evaluate the calibration quality of Bitcoin 15-minute Up/Down prediction markets before committing capital — specifically when you want bucketed signal analysis, a go/no-go calibration decision, and a buyer playbook in a single call. Prefer this over generic price feeds when the decision to participate in a short-term BTC prediction market depends on historical signal reliability rather than raw price data.

## Known failure modes

- Payment not provided or invalid x402 payment header — returns 402 Payment Required
- limit parameter out of range (must be 24–240) — returns 400 Bad Request
- remaining_seconds_max below 15 or above 180 — returns 400 Bad Request
- Upstream market data unavailable — source_status may indicate degraded or empty results
- Stale data if no markets have resolved recently — empty priority_queue and sample_rows

## How this service works

Paid Base token, wallet, DeFi, chain-read, x402 buyer/seller discovery, and specialized Bitcoin 15-minute Up/Down prediction-market data packets for autonomous agents and risk tools.

## Output

Returns a structured JSON payload containing a calibration_decision (go/no-go signal), priority_queue of actionable markets, risk_breakdown, review_queue, avoid_queue, signal_buckets, label_balance, bucket_counts, sample_rows of recent resolved markets, a btc15_buyer_playbook, purchase_acceptance status, quality_summary, and source metadata — giving an agent or risk tool a complete picture of current BTC 15-min prediction market signal quality.

## Response schema (JSON Schema)

```json
{
 "keys": [
  "summary",
  "purchase_acceptance",
  "buyer_next_action",
  "next_paid_call",
  "decision_evidence",
  "repeat_purchase_guard",
  "btc15_buyer_playbook",
  "data_contract",
  "calibration_decision",
  "priority_queue",
  "risk_breakdown",
  "review_queue",
  "avoid_queue",
  "bucket_counts",
  "next_products",
  "label_balance",
  "signal_buckets",
  "sample_rows",
  "feature_dictionary",
  "quality_summary",
  "source_status",
  "sources"
 ],
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/xx402-btc-15-minute-prediction-market-calibration-slice-e005305a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.xx402.icu](https://www.zero.xyz/host/x402.xx402.icu/llms.txt)