Koskamo

costheta MCP

Provides verifiable physical randomness derived from cosmic-ray detections for AI agents. Offers free public beacons for non-secret randomness and paid commitment-bound decisions with signed certificates for auditable outcomes.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

costheta MCP logo, by costhetaVendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-06Operated by costheta
MCP endpoint (Streamable HTTP)
https://costheta.dev/mcp
Vendor documentation

What its tools do

3 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Not annotated (3)

3 of 3 have a description · 0 of 3 declare behavior hints · 2 of 3 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Passed Official MCP Registry namespace is tied to costheta.dev ·
  • Passed Endpoint is on the registry namespace domain ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Generate free public randomness via costheta_random beacon
  • Obtain paid commitment-bound decisions with signed certificates
  • Verify certificate signatures and attestation records

Source and maintenance

Vendor evidenceRegistry 0.1.0
mcp-registry: dev.costheta/costheta@0.1.0Source repositoryProject website
Maintenance checked

Protocol and capabilities

Server
costheta 0.1.0
MCP protocol negotiated in check
2025-11-25
Tools
3 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {}
}

Tools

3 advertised

costheta_random — costheta random
Advertised by the server during the last successful anonymous check.

Free public random outcome anchored to the latest signed cosmic-ray coincidence pulse. This is a shared beacon: every caller sees the same latest signed pulse until the next muon arrives. For private commitments and retry-safe paid certificates, use costheta_decide.

costheta_random input schema
{
  "type": "object",
  "properties": {
    "n_options": {
      "type": "integer",
      "default": 2,
      "maximum": 1000000,
      "minimum": 2,
      "description": "Number of equally indexed outcomes. Result is in [0, n_options)."
    }
  },
  "additionalProperties": false
}
costheta_decide — costheta decide
Advertised by the server during the last successful anonymous check.

Paid x402 Base mainnet tool: commit-and-reveal decision with a signed certificate. Requires PAYMENT-SIGNATURE and idempotency_key.

costheta_decide input schema
{
  "type": "object",
  "required": [
    "commitment",
    "idempotency_key",
    "n_options"
  ],
  "properties": {
    "n_options": {
      "type": "integer",
      "default": 2,
      "maximum": 1000000,
      "minimum": 2
    },
    "commitment": {
      "type": "string",
      "description": "Caller commitment, usually sha256:<hex>."
    },
    "idempotency_key": {
      "type": "string",
      "description": "Stable retry key. Same key + commitment returns the same paid result."
    }
  },
  "additionalProperties": false
}
costheta_witness — costheta witness
Advertised by the server during the last successful anonymous check.

Paid x402 Base mainnet tool: witness a caller commitment against a signed pulse certificate. Requires PAYMENT-SIGNATURE and idempotency_key.

costheta_witness input schema
{
  "type": "object",
  "required": [
    "commitment",
    "idempotency_key"
  ],
  "properties": {
    "commitment": {
      "type": "string",
      "description": "Caller commitment, usually sha256:<hex>."
    },
    "idempotency_key": {
      "type": "string",
      "description": "Stable retry key. Same key + commitment returns the same paid result."
    }
  },
  "additionalProperties": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (2 of 2 answered).

  1. 2026-11-06: 1 of 1 checks answered
  2. 2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
958 ms
95th percentile latency
958 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 958 ms · metadata changed · 3 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http costheta-mcp https://costheta.dev/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add costheta-mcp --url https://costheta.dev/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable costheta-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "costheta-mcp": {
      "url": "https://costheta.dev/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "costheta-mcp": {
      "type": "streamableHttp",
      "url": "https://costheta.dev/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start costheta-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "costheta-mcp": {
      "type": "http",
      "url": "https://costheta.dev/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http costheta-mcp https://costheta.dev/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://costheta.dev/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "costheta-mcp": {
      "serverUrl": "https://costheta.dev/mcp"
    }
  }
}

Let your agent find its tools

Find servers like costheta MCP from your agent. Add Koskamo once to search the index for endpoints, access requirements, and client setup. Public discovery needs no key.

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Do you run costheta MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

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