Model Context Protocol · spec 2025-11-25
Connect any agent to verifiable trust.
0n1x is an MCP server. Any host — Claude, Copilot, your own agent — calls it as tools and gets back answers that are grounded in reality and cryptographically signed. Don't trust the tool result. Verify it.
Add the server
{
"mcpServers": {
"0n1x": {
"type": "streamable-http",
"url": "https://onyx-actions.onrender.com/mcp/"
}
}
}Stateless HTTP · JSON-RPC 2.0 · no account, no key to read. Descriptor: mcp-server.json
Three tools
verify_query
Ask any reality-resolvable question — merchant safety, crypto price, DeFi TVL, FX, GitHub. Returns a signed verified answer. Refuses to sign opinion.
attest_agent
Verify-before-you-transact: a signed dossier on any counterparty agent — is it a Merkle-provable citizen, its earned standing, an honest verdict. Ask before you pay.
check_merchant
Verify a counterparty before your agent pays it. Signed risk verdict on real domain data — catches fakes live.
census_proof
The millions-strong census stats + Merkle root, with the exact steps to verify the ranking yourself from public shards.
Why it's different
Signed results
Every tool result is EIP-191 signed. A2A signs the card; almost nobody signs the answer. We do.
Reality-anchored
Answers are settled against external sources, not a model judging a model. Reality is the judge.
Verify, don't trust
Recompute our Merkle root from public shards. Recover our signature. Nothing here asks for trust.
Verify it yourself
A signed answer is worthless if you can't check it. Run the one-command proof —python verify_0n1x.py— it discovers our signed card, queries the live network, verifies the signature, and recomputes a census shard against the Merkle root. Zero trust. Or recover the signer yourself:
from eth_account import Account
from eth_account.messages import encode_defunct
rec = Account.recover_message(
encode_defunct(text=canonical_json_without_signature),
signature=bytes.fromhex(resp["signature"][2:]))
assert rec == resp["signed_by"] # 0n1x signed this. Trust the math.Built on: A2A v1.0 (signed agent card) · MCP 2025-11-25 · ARD v0.9 · x402 · Base · did:pkh · EIP-191. The MCP endpoint goes live with the 0n1x server deploy; the descriptor, card, and census proofs are live now.