# xl402 BTC Context Signal

> xl402 BTC Context Signal is a paid API for AI agents from xl402.agentsats.org, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-21).

Returns the latest signed and anchored Bitcoin macro/onchain context signal with calibrated confidence and a verification kit

## Facts

- Endpoint: POST https://xl402.agentsats.org/v1/btc-context-signal?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/xl402-btc-context-signal-86357550
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GPMsgGHlBr--HR-dMUmaS

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 xl402-btc-context-signal-86357550 -d '<json body>'
```

Example prompt: Get me the latest combined Bitcoin macro and onchain context signal from agentsats — I want the calibrated confidence score and the verification kit so I can check it myself.

## When to prefer this

Use this endpoint when you need a signed, verifiable Bitcoin macro or onchain context signal with calibrated confidence for research purposes — especially when auditability and cryptographic anchoring of the signal matter. Prefer over generic crypto data APIs when you need proof-of-provenance and Brier-calibrated confidence.

## Known failure modes

- Invalid signal type enum value returns 422 validation error
- No signal available for the requested type returns 404
- Payment not received or insufficient funds returns 402
- Service temporarily unavailable returns 503
- Signal expired or stale may be flagged in response metadata

## How this service works

Última señal de contexto Bitcoin-macro, firmada y anclada antes de venderse, con confianza calibrada y kit de verificación. Research/contexto, no consejo de inversión.

## Output

Returns the most recent Bitcoin context signal (onchain, macro, or combined), cryptographically signed and anchored, with a calibrated confidence score and a verification kit allowing the caller to independently validate the signal's authenticity and provenance.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "type": {
   "enum": [
    "onchain",
    "macro",
    "combined"
   ],
   "type": "string",
   "description": "Tipo de señal deseado (opcional; por defecto, la última vigente de cualquier tipo)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/xl402-btc-context-signal-86357550/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from xl402.agentsats.org](https://www.zero.xyz/host/xl402.agentsats.org/llms.txt)