# OBOL Bitcoin Block Signal — Pre-Trade Safety Verdict for Block Height

> OBOL Bitcoin Block Signal — Pre-Trade Safety Verdict for Block Height is a paid API for AI agents from obol-x402.fly.dev, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Returns a safety signal or forensic verdict for a given Bitcoin block height, including Satoshi-era provenance, validation-gated anomalies, and money-graph intelligence.

## Facts

- Endpoint: GET https://obol-x402.fly.dev/signal/%7Bheight%7D
- 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/obol-bitcoin-block-signal-pre-trade-safety-verdict-for-block-height-947c61cc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vVE-Im0qIH7Z2hTU93u2X

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 obol-bitcoin-block-signal-pre-trade-safety-verdict-for-block-height-947c61cc
```

Example prompt: Can you pull the OBOL safety signal for Bitcoin block 9 and tell me if it shows Satoshi-era provenance or any validation-gated anomalies — I want a signed verdict before I proceed.

## When to prefer this

Use this endpoint when you need a forensically signed, per-block Bitcoin intelligence signal — especially for Satoshi-era provenance, validation anomaly detection, or money-graph role classification — that no standard Bitcoin RPC node provides. Prefer this over raw RPC calls when you need structured safety verdicts, Ed25519-signed responses, and whale/exchange fingerprinting at the block level.

## Known failure modes

- Invalid or out-of-range block height returns an error
- Block height not yet mined returns a not-found or future-block error
- Payment not fulfilled (x402 payment required) blocks access
- Network timeout or upstream Bitcoin node unavailability
- Malformed height parameter (non-integer) causes 400 error

## How this service works

Pre-trade safety for AI agents on Base, Ethereum, Arbitrum, Optimism, Polygon, BNB and Robinhood Chain. Is this token a rug — and can I sell it again? Signed verdicts before you buy, approve, send or sign: token rug/honeypot check with buy-sell tax, honeypot sell-simulation, pre-sign calldata guard (unlimited-approve / setApprovalForAll / drain-in-multicall), wallet risk with sanctions screening, tx preflight, and a launch feed with safety overlays. Plus unique Bitcoin forensics no RPC gives you: money-graph role, whale and exchange fingerprinting, Satoshi-era provenance, validation-gated block anomalies, and broadcast-fee timing. Every response Ed25519-signed and independently verifiable. Pay-per-call USDC on Base — no keys, no accounts, no signup. Free: /catalog, /llms.txt, and a preview for every paid SKU.

## Output

A JSON object containing a safety or forensic verdict for the specified Bitcoin block height, potentially including Satoshi-era provenance indicators, validation anomaly flags, money-graph role classification, whale/exchange fingerprinting signals, and a broadcast-fee timing score. Every response is Ed25519-signed for independent verifiability.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/obol-bitcoin-block-signal-pre-trade-safety-verdict-for-block-height-947c61cc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from obol-x402.fly.dev](https://www.zero.xyz/host/obol-x402.fly.dev/llms.txt)