io.github.Dempty-glitch/z-zero-mcp
z-zero-mcp-server
Payments for AI agents: gasless USDC on Base + JIT single-use virtual cards, PAN never in context.
alive probed 2026-10-19
14tools
≈ 3.6ktokens, estimate
≈ 1.8 %of Claude's 200k window
2.5×the median server
794 msto initialize
20 msto list tools
- Run it
- npx -y z-zero-mcp-server@1.10.2 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- z-zero-mcp-server 1.10.2
- Capabilities
- prompts, resources, tools
- Instructions
- none
- Of a 1M window
- ≈ 0.4 % of a 1M context window, estimate
- Claude count
- The count_tokens endpoint refused the tool schemas: invalid x-api-key. The estimate stands in.
- Repository
- https://github.com/Dempty-glitch/Z-Zero-mcp
- Website
- https://z-zero.xyz
- Registry
- active, updated 2026-09-30 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
Estimates with the o200k_base tokenizer.
| Tool | o200k estimate | Share of this server |
|---|---|---|
| request_payment_token | 776 | 22 % |
| execute_payment | 636 | 18 % |
| report_checkout_fail | 480 | 14 % |
| ucp_probe_checkout | 471 | 13 % |
| verify_receipt | 260 | 7 % |
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The Anthropic count_tokens endpoint refused the tool schemas (invalid x-api-key). A client that validates schemas can refuse them too.