io.github.atsp-protocol/x402-conformance
x402 Conformance
Is the x402 Conformance MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-12.
x402 payment safety checks: validate a 402 answer, prove a server never serves before settlement.
alive probed 2026-11-14 · unchanged since 2026-11-12
- Run it
- npx -y x402-conformance-mcp@1.6.1 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- x402-conformance 1.6.1
- Capabilities
- tools
- Instructions
- 494 characters
- Of a 1M window
- 0.2 % of a 1M context window
- Count
- 1.7k tokens in Claude Opus 5.5, exact, measured 2026-11-12. With the Claude Code prefix mcp__…__ on each tool name: 1.8k. The o200k_base estimate is 1.0k. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/atsp-protocol/x402-conformance
- Website
- https://github.com/atsp-protocol/x402-conformance/blob/main/docs/USING.md
- Registry
- active, updated 2026-11-11 · registry entry
- Changes
- 2 recorded, reachable in 1 of them. A row is added when the result, the tool count or the cost changes.
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.67×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| x402_probe_resource_server | 375 | 225 | 22 % |
| x402_share_case | 322 | 193 | 19 % |
| x402_check_payment_required | 272 | 163 | 16 % |
| x402_start_facilitator_double | 238 | 143 | 14 % |
| x402_explain_check | 227 | 136 | 13 % |
Compare this server with others.
More servers
Other registry entries on npmjs.com, the ones next to this name; all of them.
- io.github.atlasprzetargow/mcp · alive
- AgentShield io.github.atmflow55/agentshield · no executable
- llmwiki io.github.atomicstrata/llmwiki · needs args
- Atris io.github.atrislabs/atris · crashed on start
- Remogram io.github.attebury/remogram · alive
- io.github.attestd-io/attestd-mcp · alive
- io.github.attestedintelligence/aga-mcp-server · alive
- Attestify OS io.github.attestifyagent/attestify-mcp · alive
Servers that mention conformance.
- Mekler AI ai.mekler/agent-discovery · alive
- Caption File Check com.powmcp/caption-file-check · alive
- The Service Marketing Guys Audit com.theservicemarketingguys/audit · alive
- PDF Spec (PDF Agent Stack) io.github.shuji-bonji/pdf-spec-mcp · alive
- IAMF Sentinel io.github.jlivingston-Cipher/iamf-sentinel-mcp · alive
- MCP Protocol Conformance io.studiomeyer/protocol-conformance · crashed on start
- io.github.arden-instance/x402lint · needs args
- PDF Verify (PDF Agent Stack) io.github.shuji-bonji/pdf-verify-mcp · alive
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-11-12 08:53 | alive | 297 ms | 7 | 1.7k | 1.0k |
| 2026-10-26 07:14 | install failed |
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 server answers initialize and tools/list. Nothing to fix.