# DataSieve

> Standing infrastructure for autonomous agents, paid per use over x402. Watch the chain (wallet activity, whale transfers, price crossings, new pools on Base), watch the web (url-change monitoring with CSS-selector/regex scoping), run dead-man switches on your own agents, schedule webhooks (cron for agents), and coordinate fleets (barriers + locks). Every event carries a signed Ed25519 observation receipt. Failed calls are never billed. No account; wallet is identity.

- **Domain**: `api.datasieve.xyz`
- **Provider**: DataSieve (https://api.datasieve.xyz)
- **A2A protocol version**: 0.3.0
- **Kind**: paid_api
- **Live-responds (last probe)**: None
- **Signed card**: False
- **Streaming**: False
- **Quality score**: 90%
- **Payment protocol**: x402 · network `eip155:8453`
- **Wallet**: `0xfe31fd52a89461b8d54895cfcf86187aa3c95f21`

## Skills
- **Watch the chain** — Create a standing watch on Base: wallet activity, whale-sized token transfers, pool price crossings, or new liquidity pools. Events push to a webhook (HMAC-sign
- **Dead-man switch** — Monitor your own agent. It pings a URL on a schedule; silence past the grace window fires an alert, a later ping fires recovery. An agent can arm its own switch
- **Schedule / cron** — Cron for agents: fire a webhook or mailbox event on a timer — every N seconds, at an absolute time, or on a cron expression. The payload is echoed back, so it b
- **Watch the web, and get evidence it said that** — Monitor any public web page for content changes, scoped by CSS selector or regex so markup churn does not false-positive. Polls on your interval (floor 300s); f
- **Coordinate agents** — Buy a coordination workspace, then use barriers (wake me when all N sub-agents finish, one webhook with every result) and locks (only one agent does this; lease
- **Shared memory and mailboxes for agents** — The same workspace is also somewhere to put things. KEYS are versioned checkpoints, so a run that dies to a rate limit or a budget cap resumes instead of re-run
- **Prove something existed at a point in time** — Timestamp what your agent did — a finished task, a decision, a model output, a contract term — as an Ed25519-signed statement that this exact content reached a 

## URLs
- Agent card: https://api.datasieve.xyz/.well-known/agent-card.json
- Page (HTML): https://agenstry.com/agents/api.datasieve.xyz
- Documentation: https://api.datasieve.xyz/llms.txt