# costheta (remote · costheta.dev)

Verifiable physical randomness from cosmic-ray detections. Free beacon, paid signed decisions.

- Trust score: 61/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-20

## Components

- remote · `costheta.dev`: 61/100 (this document), [markdown](https://verifymcp.io/servers/dev-costheta-costheta/costheta.md), [page](https://verifymcp.io/servers/dev-costheta-costheta/costheta)

## Channel facts

- Endpoint: `https://costheta.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-20.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 72/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 243 tokens (~81/item across 3 items; 3 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 94/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 83% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http dev-costheta-costheta https://costheta.dev/mcp
```

### Codex

```toml
[mcp_servers.dev-costheta-costheta]
url = "https://costheta.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "dev-costheta-costheta": {
      "type": "remote",
      "url": "https://costheta.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add dev-costheta-costheta --url https://costheta.dev/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  dev-costheta-costheta:
    url: "https://costheta.dev/mcp"
```

### Other

```json
{
  "mcpServers": {
    "dev-costheta-costheta": {
      "type": "http",
      "url": "https://costheta.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-19 (score 61, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-17 (score 60, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-15 (score 59, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-14 (score 58, 0)

- [security] Tool “costheta_decide” rewrote its description, which is the text the model reads
- [security] Tool “costheta_witness” rewrote its description, which is the text the model reads

### 2026-08-13 (score 58, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-08-12 (score 58)

First indexed and scored.

## MCP tools (3)

### `costheta_random` (~81 tokens)

costheta random

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.

Input parameters:

- `n_options` (integer): Number of equally indexed outcomes. Result is in [0, n_options).

### `costheta_decide` (~85 tokens)

costheta decide

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

Input parameters:

- `commitment` (string, required): Caller commitment, usually sha256:<hex>.
- `idempotency_key` (string, required): Stable retry key. Same key + commitment returns the same paid result.
- `n_options` (integer, required)

### `costheta_witness` (~77 tokens)

costheta witness

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

Input parameters:

- `commitment` (string, required): Caller commitment, usually sha256:<hex>.
- `idempotency_key` (string, required): Stable retry key. Same key + commitment returns the same paid result.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/dev-costheta-costheta/costheta#diagnostics

## Score history

- 2026-08-20: 61
- 2026-08-19: 61
- 2026-08-18: 60
- 2026-08-17: 60
- 2026-08-16: 59
- 2026-08-15: 59
- 2026-08-14: 58
- 2026-08-13: 58
- 2026-08-12: 58

## Links

- Remote endpoint: https://costheta.dev/mcp
- Repository: https://github.com/costhetadev/costheta-verify
- Website: https://costheta.dev/
- Changelog RSS feed: https://verifymcp.io/servers/dev-costheta-costheta/costheta.xml
- Changelog JSON feed: https://verifymcp.io/servers/dev-costheta-costheta/costheta.json
- HTML version of this page: https://verifymcp.io/servers/dev-costheta-costheta/costheta