Coordinate multiple agents through one shared workspace: $0.25 for 7 days and 1000 operations, all free after this one payment. BARRIER — collect results from N sub-agents: each gets its own arrive URL; when the last one reports, ONE webhook fires with everything collected; a missed deadline sends a partial event naming who's missing. LOCK — exactly one agent performs a critical step: others get 409 naming the holder, and leases expire on their own, so a crashed agent never blocks the rest.

Cron expression parser: parse any 5/6-field cron and get the next N run times (any IANA timezone via "tz") plus seconds-until-next. $0.001 per call. POST {"cron":"0 9 * * *","tz":"America/New_York","count":5}. Unlike every other cron parser on this marketplace, the same host can also RUN your cron: POST /watch/standard with a schedule condition fires an HMAC-signed webhook on that expression for 7 days. Failed calls are never billed.

x402 payment self-test: verify your agent's payment stack end-to-end against a production seller for $0.001. Returns payer address, network and server time; the settlement tx lands in the X-PAYMENT-RESPONSE header. Smoke-test a new wallet, client library, or an agent's first-ever paid call before pointing it at anything expensive. Failed calls are never billed. This host also sells standing infra: on-chain watches, dead-man switches, cron schedules, url-change monitors, coordination.

A 7-day watch, ONE condition: on-chain on Base (wallet activity, whale token transfers, price crossings, new pools), a heartbeat dead-man switch for your agent (silence fires the alert), a schedule/cron webhook, or a url-change website monitor (CSS-selector/regex scoped). No account: one paid call returns a watch id + secret. Events push to your webhook (HMAC-signed) and a pollable mailbox, each with a signed Ed25519 receipt. Failed calls never billed. 50 triggers; {"renew":"wt_..."} extends.