# Obol Bitcoin Broadcast-Timing Decision Feed

> Obol Bitcoin Broadcast-Timing Decision Feed is a paid API for AI agents from obol-x402.fly.dev, paid per call via x402, $0.05/call, status down (last checked 2026-09-15).

Returns a real-time Bitcoin fee decision signal — including next-block fee estimate, fee trend, broadcast verdict (now/wait/wait briefly), mempool congestion, and BTC spot price — to help agents optimally time BTC transaction broadcasts.

## Facts

- Endpoint: GET https://obol-x402.fly.dev/pulse
- Price: $0.05/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-broadcast-timing-decision-feed-a5b6bbe5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_blDZpFKYty62l-ubKHLww

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-broadcast-timing-decision-feed-a5b6bbe5
```

Example prompt: I'm about to broadcast a Bitcoin transaction — check the mempool right now and tell me whether I should send it immediately or wait a bit to save on fees.

## When to prefer this

Use this endpoint when an agent needs a high-level, actionable broadcast-timing decision rather than raw fee data. It synthesizes mempool backlog, fee trends, and congestion into a single verdict ('broadcast now / wait / wait briefly'), saving the agent from having to implement its own decision logic. Prefer this over raw fee-rate endpoints when you want a pre-interpreted recommendation with trend context and a recheck timer. The Ed25519 signature provides verifiability for audit trails.

## Known failure modes

- Payment not provided or invalid x402 payment header — returns 402 Payment Required
- Upstream Bitcoin node or mempool data source unavailable — returns 503 or degraded response
- Rate limit exceeded — returns 429
- Malformed request — returns 400
- Fly.dev cold-start latency on first call after idle period

## How this service works

Bitcoin broadcast-timing decision feed for agents: next-block fee estimate sat/vB, fee TREND (rising/falling since last poll), broadcast verdict (broadcast now / wait / wait briefly), economy-tier savings %, recheck-in-seconds, mempool backlog, congestion tier, fee-spike flag, tip height, BTC spot. Poll each cycle to time a BTC broadcast and minimize fees — should I broadcast now? ... Cryptographically signed (Ed25519) — every response is independently verifiable via /.well-known/obol-pubkey.

## Output

Returns a structured decision feed including: next-block fee estimate in sat/vB, fee trend direction (rising/falling since last poll), a broadcast verdict (broadcast now / wait / wait briefly), economy-tier savings percentage, seconds until recommended recheck, mempool backlog stats, congestion tier label, a boolean fee-spike flag, current chain tip height, and BTC/USD spot price. The entire payload is cryptographically signed with Ed25519 for tamper verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/obol-bitcoin-broadcast-timing-decision-feed-a5b6bbe5/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)