# Services from api.datasieve.xyz on Zero

> api.datasieve.xyz serves 8 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/api.datasieve.xyz
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.datasieve.xyz/health.json

## Services

- [DataSieve Standard Watch](https://www.zero.xyz/c/datasieve-standard-watch-10d5ef03/llms.txt): $0.1/call via x402. Sets up a 7-day event-driven monitor on Base chain activity, heartbeat/dead-man switch, cron/schedule, or URL change, pushing HMAC-signed events to a webhook or pollable mailbox.
- [DataSieve x402 Payment Ping](https://www.zero.xyz/c/datasieve-x402-payment-ping-cbf38dca/llms.txt): $0.001/call via x402. Smoke-tests an agent's x402 payment stack end-to-end for $0.001, returning payer address, network, and server time with the settlement transaction in the response header.
- [DataSieve Standard30 Watch — Blockchain & Heartbeat Monitor](https://www.zero.xyz/c/datasieve-standard30-watch-blockchain-heartbeat-monitor-8b45ad3c/llms.txt): $0.35/call via x402. Creates a 30-day standing watch on Base blockchain events or a dead-man-switch heartbeat, firing webhook alerts up to 200 times, paid per call via x402.
- [DataSieve Receipt Notarization](https://www.zero.xyz/c/datasieve-receipt-notarization-b486e2ac/llms.txt): $0.005/call via x402. Cryptographically notarizes an arbitrary JSON claim by returning a signed Ed25519 receipt attesting to the content hash and timestamp at the moment of receipt.
- [DataSieve Composite Watch](https://www.zero.xyz/c/datasieve-composite-watch-51e82bf0/llms.txt): $0.25/call via x402. Creates a multi-condition blockchain/time/heartbeat watcher on Base that fires webhook alerts when any configured condition triggers, paid per call via x402.
- [DataSieve Composite30 Watch — Multi-Condition Blockchain Monitor](https://www.zero.xyz/c/datasieve-composite30-watch-multi-condition-blockchain-monitor-b945e59b/llms.txt): $0.85/call via x402. Creates a composite watch (up to 30 conditions) on Base blockchain for wallet activity, token transfers, price crosses, new pairs, heartbeat dead-man switches, and scheduled triggers, with webhook delivery and a 7-day active period.
- [DataSieve Coordination Workspace](https://www.zero.xyz/c/datasieve-coordination-workspace-986b6f76/llms.txt): $0.25/call via x402. Creates a shared multi-agent coordination workspace supporting BARRIER (fan-in synchronization) and LOCK (mutual exclusion) primitives for orchestrating concurrent agent workflows.
- [Cron Expression Parser & Next-Run Calculator](https://www.zero.xyz/c/cron-expression-parser-next-run-calculator-09e65861/llms.txt): $0.001/call via x402. Parses a 5- or 6-field cron expression and returns the next N upcoming run times in any IANA timezone, plus seconds until the next execution.

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)