One POST per call. The 402 challenge carries the exact amount and a line-item breakdown before you sign, so an agent always knows the cost first.
Dynamic pricing — the exact quote is returned in each 402 before any spend. Volume tools bill per returned item and require resultsLimit, so you never pay for more than you asked for.
Watch an account and get the post as it lands, have every event signed and pushed to your endpoint, and post as your own handle without handing over your keys.
Monitor an account or keyword and get the post the moment it lands. 21 event types, prepaid by the hour at about $0.025/hr, stops on its own at expiry.
Every event arrives as an HMAC-signed POST with a durable retry ladder over ~36 minutes, auto-pause on repeated failure, and a terminal monitor.expired event.
Connect an X account once, then pay per action across 12 write types. Credentials are relayed sealed — never stored here, never in a URL, never seen by the calling agent.
We publish an installable agent skill — the full workflow for connecting an account, creating monitors, verifying webhook signatures and posting, including the unattended loop that drafts in your voice and queues replies for approval. Point any skill-aware client at it and it knows how to drive twitr.sh end to end.
/skill.mdthe agent playbook/llms.txtservice index for LLMs/openapi.jsonschemas + payment discoveryPOST /api/mcptools/list free · tools/call paid14 tools, one spec. Your agent pays, we run it, you get clean JSON.
Listings in progress — the agent directories and payment indexes we publish to, not endorsements.