org.448c/sentinel

up checked 2026-11-11T11:37:33.452Z

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Publisher-provided title

Sentinel

Publisher-provided description

Pay-per-call safety checks for AI agents: screen a crypto address or URL before you transact.

Summary by lookupd

Screens crypto addresses and URLs for risk, attests fetched pages, runs sandboxed code, and provides leases, storage and watches for agents.

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http sentinel https://448c.org/mcp

Codex, remote (streamable-http)

codex mcp add sentinel --url https://448c.org/mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "sentinel": {
      "url": "https://448c.org/mcp"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (showing 30 of 54)

Publisher-provided text

execute PAID: run code in an isolated, network-less sandbox and get stdout, stderr and exit code back. Call it once without payment to receive the price as an x402 Paym
storage_buy PAID: store opaque bytes for the life of the plan you buy, owned by the wallet that pays, readable with no account. Returns the object id and when it expires; r
storage_renew PAID: push an object you own further out, by buying it another plan term. The object is untouched; only its expiry moves. Returns the new and previous expiry. C
storage_replace PAID: overwrite the contents of an object you own, keeping its id, and buy it a fresh plan term at the same time. Omit label to keep the current one, pass an em
storage_read FREE: read back an object you own, as base64. This is how what you bought with storage_buy comes back to you over MCP. Ownership is proved by the paying wallet,
storage_list FREE: list the objects your wallet owns -- id, label, size, when each was created and when it expires -- one page at a time. Ownership is proved by the paying w
storage_usage FREE: how many objects your wallet is storing and how many bytes they occupy. Ownership is proved by the paying wallet, with no account: send any placeholder si
storage_delete FREE: delete an object you own before it expires, and free its bytes. There is no refund and no undo. Ownership is proved by the paying wallet, with no account:
claim_acquire PAID: atomically win a caller-named key for your own fleet -- an accountless compare-and-set. outcome "acquired" means you won it; outcome "held" is NOT an erro
claim_renew PAID: extend a hold you already have without losing your place in line -- the heartbeat that lets a lease be SHORT (so a crash frees it fast) while a live holde
claim_acquire_free FREE: win a caller-named key for 300 seconds, or learn who already holds it. Unlimited distinct keys per wallet, renewable by calling again. A sibling of claim_
claim_read FREE: who currently holds this key, if anyone -- scoped to YOUR wallet, so a stranger cannot probe your namespace. Checking your own lock must not cost again, o
claim_release FREE: give up a key you hold before it expires, so the next racer does not have to wait out your hold. Release signs its own domain-separated message, distinct
attest_create PAID: we fetch a URL from OUR vantage point and return a signed, timestamped attestation of what we saw -- hash, byte count, HTTP status and headers, never the
attest_read FREE and unauthenticated: read a previously-created attestation back by id, with its signature. This is how what you bought with attest_create comes back over M
handoff_deposit PAID: deposit a typed briefing for the process that takes over from you -- what is DONE (every entry carrying evidence of how it was verified), what is NOT done
handoff_read FREE and unauthenticated: read a briefing back by id. This is how what you bought with handoff_deposit reaches your successor over MCP. Deliberately needs no si
deadman_register PAID: register an intent you are about to act on irreversibly, with a lease and a verification probe (a GET plus a predicate). Confirm before the lease expires
deadman_confirm FREE: the live caller closes the loop before the lease expires, so the probe never runs. Deliberately NOT wallet-scoped -- possession of the id is the entire au
deadman_read FREE and unauthenticated: read an entry back by id, including its verdict and the raw probe response once resolved. This is how what you bought with deadman_reg
listing_promote PAID: buy paid placement for a listing you own in this directory -- it ranks above free rows and reads tier "paid" for the life of the plan. Pay from the WALLET
drift_check PAID: we re-fetch a venue we have snapshotted before, from OUR vantage point, and return what changed since the baseline -- the schema/rubric fields that moved,
drift_venues FREE: every venue id drift_check can be aimed at, with what we hold for each. A closed value set, not a pattern: without it a caller can honour the input schema
drift_baseline FREE: the baseline snapshot we hold for one venue -- what a paid check would diff against, and when it was taken. Reading what you are about to buy a comparison
watch_register PAID: we poll a URL from OUR vantage point on your interval until your predicate matches or the ttl runs out, and keep the verdict for you to collect -- a wait
watch_read FREE: the current state of a watch you registered -- active, matched or expired, with the observation that matched. The id is the capability, so a successor pro
check_address PAID: check an EVM address against public risk feeds (OFAC, community darklists, on-chain age) and get back a verdict, score and reasons in the same response th
check_url PAID: check a URL against public risk feeds (phishing lists, domain age, lexical signals) and get back a verdict, score and reasons in the same response the pay
check_counterparty PAID: grade an x402 challenge you are about to sign against what you expected -- payee, resource, network, asset and price -- and get back a verdict, score and
flights_lookup PAID: one live-flight lookup for $0.0100. Give a callsign, a 6-hex ICAO24 address or a tail number and get the aircraft's current position, altitude, ground spe

Details

Version: 0.0.1
Transports: streamable-http
Uptime (7 days): 100%
Median latency: 1048 ms
First indexed: 2026-11-01T10:08:00.820Z
Last seen in registry: 2026-11-01T10:08:00.820Z

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