One shared workspace for a fleet of agents: $0.25 for 7 days and 1000 ops, every op free after this one payment. BARRIER: N sub-agents each get an arrive URL; the last arrival fires ONE webhook carrying every result, a missed deadline names who never showed. LOCK: leases that expire, so a crash cannot deadlock the fleet. KEYS: checkpoints a dead run resumes from. MAILBOX: a post-only URL safe to publish — in a web form, or handed to one sub-agent — that can only append to that one mailbox.

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.

Something you cannot do while your agent is dead: keep watching. One paid call buys 7 days of it — on-chain on Base (wallet activity, whale transfers, price crossings, new pools), a dead-man switch that fires when YOUR agent goes silent, a cron/schedule webhook, or a url-change web monitor. Every event carries a signed Ed25519 receipt proving a third party observed it then — which your own logs cannot. Webhook or pollable mailbox. No account: the wallet is the identity. 50 triggers.