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On-chain watches, web-page monitors, dead-man switches, cron, and agent coordination, paid via x402.
About
On-chain watches, web-page monitors, dead-man switches, cron, and agent coordination, paid via x402.
Security Report
10.0
Low Risk10.0Low RiskValid MCP server (2 strong, 3 medium validity signals). No known CVEs in dependencies. Package registry verified. Imported from the Official MCP Registry.
3 files analyzed · 1 issue found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Path to a file holding a burner wallet key (0x…) with USDC on Base. Optional — free tools work without it.
Environment variable: DATASIEVE_PRIVATE_KEY_FILE
API base URL. Default https://api.datasieve.xyz; sandbox https://staging.datasieve.xyz (Base Sepolia, faucet USDC).
Environment variable: DATASIEVE_API_URL
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-gitwormq-datasieve": {
"env": {
"DATASIEVE_API_URL": "your-datasieve-api-url-here",
"DATASIEVE_PRIVATE_KEY_FILE": "your-datasieve-private-key-file-here"
},
"args": [
"-y",
"datasieve-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
datasieve-mcp
MCP server for DataSieve — standing infrastructure for AI agents, paid over x402. On-chain conditions on Base (wallet activity, whale transfers, price crossings, new pools), url-change web monitoring (CSS selector / regex scoped), dead-man switches for your own agents (your agent pings a URL; silence fires the alert), cron schedules (fire a webhook every N seconds, at a time, or on a cron expression), and multi-agent coordination (barriers + locks). Every event carries a signed Ed25519 observation receipt. No account, no API key: one gasless USDC payment per watch, signed locally — your key never leaves your machine. Failed calls are never billed.
Setup — no key required to start
claude mcp add datasieve -- npx -y datasieve-mcp
Most tools work with no wallet at all — check our scanner's health, read watch status, drain events, ping dead-man switches, pause/resume, verify receipts, cancel watches. Only the buying tools spend money.
The Claude Code skill (recommended)
npx -y datasieve-mcp --install-skill
Installs a skill into ~/.claude/skills/datasieve/ that teaches Claude when to
reach for standing infrastructure proactively: arm a dead-man switch before
long autonomous work, schedule wake-ups, watch pages and wallets, coordinate
sub-agents.
When you want to buy
x402 means paying is a signature, so purchases need a key. Two rules:
- Use a dedicated burner wallet holding a few dollars of USDC on Base — never your main wallet. Payments are gasless (EIP-3009), so it needs no ETH.
- Keep the key out of config files — point at a file instead:
echo '0xYOUR_BURNER_KEY' > ~/.datasieve/key.txt && chmod 600 ~/.datasieve/key.txt
claude mcp add datasieve -e DATASIEVE_PRIVATE_KEY_FILE=$HOME/.datasieve/key.txt -- npx -y datasieve-mcp
(DATASIEVE_PRIVATE_KEY=0x... inline also works if you prefer.)
The key never leaves the process: each payment is a signature authorizing
exactly the route price — one at a time, nothing standing. Run
payment_status to see the wallet, its balance, and prices before spending
anything.
Rehearse for free
claude mcp add datasieve-sandbox -e DATASIEVE_API_URL=https://staging.datasieve.xyz \
-e DATASIEVE_PRIVATE_KEY_FILE=$HOME/.datasieve/key.txt -- npx -y datasieve-mcp
Same API, Base Sepolia, faucet USDC. Sandbox watches last 1 hour.
Tools
| tool | cost | what |
|---|---|---|
create_watch | $0.10 (standard/7d) · $0.25 (composite/7d, ≤5 conditions) · $0.35 (standard30/30d) · $0.85 (composite30/30d) | buy a watch; returns id, secret, ping URLs |
renew_watch | tier price | one more period, trigger budget reset |
coord_workspace | $0.25 / 7d | multi-agent barriers + locks; every op after is free |
cron_next | $0.001 | parse a cron expression: next N run times, any timezone |
x402_ping | $0.001 | end-to-end payment stack self-test |
watch_status | free | heartbeat, triggers, expiry, up/down per dead-man switch |
drain_events | free | collect everything caught while you weren't running |
pause_watch / resume_watch | free | stop firing without deleting; backlog-free resume |
ping_heartbeat | free | keep your dead-man switch alive |
verify_receipt | free | check the Ed25519 receipt on any delivered event |
coord_barrier / coord_arrive / coord_lock / coord_release / coord_events | free | workspace ops |
delete_watch | free | cancel |
service_health | free | verify our scanner is alive before you pay |
payment_status | free | wallet address, USDC balance, prices — "can I buy?" |
Watch ids and secrets are remembered in ~/.datasieve/watches.json (mode 600),
so follow-up calls only need the watch id — the persistent memory your
ephemeral agent lacks.
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