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ProofCheck

MCP server · hosted · v0.1.0 · io.github.something-agent/proofcheck
Online · tested 1h agoNEW · 1h agoSeen in the registry 59m ago

Free x402 offer/receipt checker: verifies signatures and whether the signer fits the host.

Website ↗Source code ↗How to connect ↓

What it does

ProofCheck is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.

No capability identified yet from its description.

Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence). None of this is a test of the tool.

At a glance

Hosted (remote)YES
Local installNO
Version0.1.0
PriceNot in the registry
First seen27 Oct 2026
Last checked59m ago

How to connect

As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 1h ago (live check)

Hosted endpoint

  • https://proofcheck.something-agent.workers.dev/mcp streamable-http

In Claude Code: claude mcp add --transport http proofcheck https://proofcheck.something-agent.workers.dev/mcp

MCP settings (Claude Desktop, Cursor and other MCP clients)

{
  "mcpServers": {
    "proofcheck": {
      "url": "https://proofcheck.something-agent.workers.dev/mcp"
    }
  }
}

Live check

Electra Index connected to the hosted endpoint 1h ago

ONLINE ProofCheck answered an MCP connection on 27 Oct 2026 and introduced itself as proofcheck 0.1.0 (MCP protocol 2025-06-18).

5 tools offered to AI assistants

  • verify_offer · Verify an x402 signed offer (EIP-712 or JWS): signature, expiry, match to accepts[], and signer-authorization evidence (payTo, did:web, DNS _controllers, ERC-8004). Free.
  • verify_receipt · Verify an x402 signed receipt (EIP-712 or JWS) returned in the settlement response: signature, freshness, payer/resource/transaction match, signer-authorization evidence. Free.
  • verify_payment_required · Verify every signed offer inside a PaymentRequired object (pass the decoded JSON, or the raw base64 PAYMENT-REQUIRED header). Free.
  • preflight_x402_endpoint · Unpaid preflight of an x402 URL: fetch its 402, summarise accepts[]/extensions, verify any signed offers and report who can vouch for the signer. Never pays. Free.
  • lookup_erc8004_agent · Read-only ERC-8004 identity lookup (owner, agentWallet, registration file, endpoint-domain verification) on Ethereum, Base, Optimism, Arbitrum, Polygon, BNB, Avalanche, Gnosis, Celo, Linea or Scroll.

What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method

Is this your server? Monitoring Pro: a check every 30 minutes and an email within the hour when it stops answering. Launch offer: $39.99 once, for life.

Facts & evidence

Each fact shows where it was seen and when.
FactValueEvidenceSourceLast confirmed
Hosted endpointhttps://proofcheck.something-agent.workers.dev/mcpDECLAREDSRC-001 Official MCP Registry59m ago
Local install (package)noDECLAREDSRC-001 Official MCP Registry59m ago
Remote access (hosted)yesDECLAREDSRC-001 Official MCP Registry59m ago
Websitehttps://proofcheck.something-agent.workers.devDECLAREDSRC-001 Official MCP Registry59m ago
Repositoryhttps://github.com/something-agent/proofcheckDECLAREDSRC-001 Official MCP Registry59m ago
Registry statusactiveDECLAREDSRC-001 Official MCP Registry59m ago
Version0.1.0DECLAREDSRC-001 Official MCP Registry59m ago
MCP serveryesDECLAREDSRC-001 Official MCP Registry59m ago

Change history

  • NEW27 Oct 2026
    first seen in the index

Is this page accurate?

Flag it and our robot re-checks the official source. Reports never change a score.

Do you run ProofCheck? Know when it stops answering

For publishers · optional

Its hosted endpoint can be monitored. Monitoring Pro connects every 30 minutes like an AI assistant, emails you within the hour when it stops answering, keeps a 90-day availability history and adds your answer rate to your badge.

Monitor ProofCheckLaunch offer $39.99 once, for life instead of $9.99/month · All plans

Monitoring never changes a score or a rank.

Are you the publisher of ProofCheck?

Free · show your listing

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Announce it on LinkedInListed on Electra Index
<a href="https://electraindex.com/mcp/proofcheck?utm_source=badge&utm_medium=share&utm_campaign=listing"><img src="https://electraindex.com/api/badge/proofcheck" alt="Listed on Electra Index"></a>

Questions about ProofCheck

How do I connect ProofCheck?

Use the hosted endpoint https://proofcheck.something-agent.workers.dev/mcp in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.

What tools does ProofCheck offer?

When Electra Index connected on 27 Oct 2026, it listed 5 tools: verify_offer, verify_receipt, verify_payment_required, preflight_x402_endpoint, lookup_erc8004_agent. The full list is in "Live check" above.

Is ProofCheck online?

Yes. Its hosted endpoint answered an MCP connection from Electra Index 1h ago.