costheta is a remote MCP server that gives an AI agent 3 tools, among them costheta_decide, costheta_random, costheta_witness. It answers at https://costheta.dev/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 6 of 6 times since 10 September 2026; the last check, on 19 October 2026, succeeded.
Verifiable physical randomness from cosmic-ray detections. Free beacon, paid signed decisions.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
costheta_decide | Paid x402 Base mainnet tool: commit-and-reveal decision with a signed certificate. Requires PAYMENT-SIGNATURE and idempotency_key. Inputs: commitment, idempotency_key, n_options |
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 certific Inputs: n_options |
costheta_witness | Paid x402 Base mainnet tool: witness a caller commitment against a signed pulse certificate. Requires PAYMENT-SIGNATURE and idempotency_key. Inputs: commitment, idempotency_key |
Every block below points at https://costheta.dev/mcp. Pick your client and copy.
claude mcp add --transport http costheta https://costheta.dev/mcp
{
"mcpServers": {
"costheta": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://costheta.dev/mcp"]
}
}
}{
"mcpServers": {
"costheta": {
"url": "https://costheta.dev/mcp"
}
}
}{
"servers": {
"costheta": {
"type": "http",
"url": "https://costheta.dev/mcp"
}
}
}{
"context_servers": {
"costheta": {
"url": "https://costheta.dev/mcp"
}
}
}{
"mcpServers": {
"costheta": {
"serverUrl": "https://costheta.dev/mcp"
}
}
}{
"mcpServers": {
"costheta": {
"url": "https://costheta.dev/mcp"
}
}
}name: costheta
version: 0.0.1
schema: v1
mcpServers:
- name: costheta
type: streamable-http
url: https://costheta.dev/mcp{
"mcpServers": {
"costheta": {
"httpUrl": "https://costheta.dev/mcp"
}
}
}{
"mcpServers": {
"costheta": {
"type": "http",
"url": "https://costheta.dev/mcp"
}
}
}{
"mcpServers": {
"costheta": {
"url": "https://costheta.dev/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fcostheta.dev%2Fmcp&type=streamable_http&id=costheta&name=costheta
It answered our last check on 19 October 2026 in 289 ms. Over 6 checks since 10 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.
Yes. It is published by costheta.dev and served from costheta.dev, the vendor's own domain: https://costheta.dev/mcp.
3, as returned by the server's own tools/list on 11 September 2026: costheta_decide, costheta_random, costheta_witness.
It answered our last check on 19 October 2026 in 289 ms. Over 6 checks since 10 September 2026 it answered 6.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://costheta.dev/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: dev.costheta. Endpoint host: costheta.dev. ARD identifier: urn:air:dev.costheta:mcp:costheta.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.