# Services from obol-payai.fly.dev on Zero

> obol-payai.fly.dev serves 3 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/obol-payai.fly.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/obol-payai.fly.dev/health.json

## Services

- [Bitcoin Block Anomaly Detector](https://www.zero.xyz/c/bitcoin-block-anomaly-detector-ba80f1ec/llms.txt): $0.01/call via x402. Detects and returns on-chain anomaly signals for a given Bitcoin block height, including fee-exceeds-subsidy, empty block, difficulty retarget, timestamp inversion, long block gap, and coinbase message anomalies.
- [Obol PayAI Bitcoin Broadcast Timing Feed](https://www.zero.xyz/c/obol-payai-bitcoin-broadcast-timing-feed-d3b1136c/llms.txt): $0.05/call via x402. Returns a real-time decision feed indicating whether to broadcast a Bitcoin transaction now, wait, or wait briefly, based on mempool fee estimates, trend, and congestion analysis.
- [Obol PayAI Crypto Spot Prices](https://www.zero.xyz/c/obol-payai-crypto-spot-prices-cf4060fe/llms.txt): $0.01/call via x402. Returns real-time USD spot prices for BTC, ETH, SOL, USDC, and USDT in one call, aggregated from Coinbase and Kraken, with stale-price and price-divergence flags, cryptographically signed via Ed25519.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)