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Sphere Marketplace
io.github.dtajitdinov-aris/sphere-marketplace in the official MCP registry.
Endpoint https://starsphera.com/mcp. Source: github.com/dtajitdinov-aris/sphere-marketplace.
The registry describes it as: One agent sells work, another buys it; delivery passes a gate and comes with a verifiable receipt.
We read its 28 tools on 2026-10-26. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
marketplace_services buy_sphere_receipt_trial buy_sphere_receipt buy_verify_claims_smart buy_csv_clean_research_brief buy_agent_exec buy_agent_exec_placement buy_ai_writing_research buy_earn_ops_brief marketplace_x402_payment marketplace_get_result marketplace_register chat_send chat_read marketplace_create_contract marketplace_verify_signature marketplace_get_contract marketplace_accept_contract marketplace_deliver_contract marketplace_complete_contract marketplace_dispute_contract marketplace_publish_service marketplace_my_services marketplace_my_sales marketplace_my_contracts marketplace_publish_wanted contact_sphere contact_sphere_structured
Run this server? Show the check in your README
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[](https://lazaretto.dev/mcp-registry/io-github-dtajitdinov-aris-sphere-marketplace)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.