# BTC15 Calibration Slice API

> BTC15 Calibration Slice API is a paid API for AI agents from xx402.icu, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Returns aggregate calibration buckets and sample rows from recently resolved Bitcoin 15-minute Up/Down prediction markets, including signal quality and feature summaries.

## Facts

- Endpoint: GET https://xx402.icu/x402/api/btc15-calibration-slice
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/btc15-calibration-slice-api-d8a41fcd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ktjyhiiD9ayJQMAK2ctm6

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 btc15-calibration-slice-api-d8a41fcd
```

Example prompt: Pull me a BTC15 calibration slice looking at the last 120 resolved Bitcoin 15-minute Up/Down markets, using a final-window cutoff of 60 seconds remaining, and return up to 24 compact sample rows so I can check the label balance and signal bucket distributions.

## When to prefer this

Choose this endpoint when you need calibration-focused aggregate statistics and sample rows from recently resolved Bitcoin 15-minute Up/Down prediction markets — specifically when evaluating signal bucket distributions, label balance, and feature quality for model training or live trading decisions. Prefer this over generic market data feeds when your goal is microstructure calibration rather than raw price or order book data.

## Known failure modes

- Payment not received or x402 payment rejected — endpoint returns 402 Payment Required
- limit parameter out of range (below 24 or above 240) — request rejected with validation error
- remaining_seconds_max out of range (below 15 or above 180) — request rejected with validation error
- Upstream data source unavailable — source_status may indicate degraded or partial data
- No resolved markets found within the requested window — returns empty buckets or minimal summary

## How this service works

Paid x402 buyer market scout, x402 paid resource preflight, x402 seller visibility audit, Base actionable risk feed, liquidity exit risk alerts, pool launch risk feed, stable asset risk feed, contract control event feed, protocol outflow risk feed, yield pool allocation risk feed, protocol fee quality feed, token watchlist decision packet, wallet watchlist decision packet, approval risk feed, ranked DeFi review queues with incident history, onchain risk decision packet, promoted token campaign decision packet, large transfer decision packet, token candidate screening decision radar, DEX pair anomaly decision radar, wallet safety decision packet, counterparty flow, allowance, approval exposure, DEX pair routing risk, token trade safety, token liquidity, token flow, holder concentration, contract controls, batch token screening decision packets, token diligence, and BTC15 prediction-market microstructure, execution-friction, calibration-slice, recent market tape, resolved feature sample, and threshold-pressure packets for agents and risk tools.

## Output

A JSON object containing a summary of recent resolved BTC 15-minute markets, a calibration decision, label balance statistics, signal bucket aggregates, compact sample rows (up to the requested count), a feature dictionary, a quality summary, and source status details — enabling assessment of prediction signal reliability and market microstructure calibration.

## Response schema (JSON Schema)

```json
{
 "keys": [
  "summary",
  "calibration_decision",
  "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/btc15-calibration-slice-api-d8a41fcd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from xx402.icu](https://www.zero.xyz/host/xx402.icu/llms.txt)