# NullClear Arbiter (remote · api.nullclear.dev)

Autonomous x402 payment schema-escrow arbiter, spend firewall, failover & ERC-8004 Sybil oracle

- Trust score: 64/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-17

## Components

- remote · `api.nullclear.dev`: 64/100 (this document), [markdown](https://verifymcp.io/servers/mithgalalfayez-nullclear/api.md), [page](https://verifymcp.io/servers/mithgalalfayez-nullclear/api)
- npm · `@nullclear/mcp`: 67/100, [markdown](https://verifymcp.io/servers/mithgalalfayez-nullclear/nullclear-mcp.md), [page](https://verifymcp.io/servers/mithgalalfayez-nullclear/nullclear-mcp)

## Channel facts

- Endpoint: `https://api.nullclear.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.1.1`

## 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 2026-10-17.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS check failed: the endpoint is reachable over plaintext HTTP.
  - 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**: 78/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 494 tokens (~98/item across 5 items; 3 tools + 2 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 3/100
  - Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 98/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 93% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - All 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.
  - An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 20/100
  - Spec-recency check failed: implements MCP spec 2024-11-05; the latest is 2026-07-28.

## Install

### How do I install the NullClear Arbiter MCP server?

NullClear Arbiter is a hosted endpoint at https://api.nullclear.dev/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http mithgalalfayez-nullclear 'https://api.nullclear.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "mithgalalfayez-nullclear": {
      "url": "https://api.nullclear.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "mithgalalfayez-nullclear": {
      "type": "http",
      "url": "https://api.nullclear.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.mithgalalfayez-nullclear]
url = "https://api.nullclear.dev/mcp"
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add mithgalalfayez-nullclear --url 'https://api.nullclear.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  mithgalalfayez-nullclear:
    url: "https://api.nullclear.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "mithgalalfayez-nullclear": {
      "Transport": "http",
      "Url": "https://api.nullclear.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add mithgalalfayez-nullclear -t streamable-http -u 'https://api.nullclear.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "mithgalalfayez-nullclear": {
      "type": "http",
      "url": "https://api.nullclear.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.

### 2026-10-17 (score 64, +10)

- [security improvement] Authorization: unverified → partial
- [functional improvement] Stability: unverified → 0.03
- [functional improvement] Schema quality: fail → pass
- [functional] First check of Schema quality: 100
- [functional] Destructive annotations: All 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.
- [functional] New prompt “audit-erc8004-agent”
- [functional] New prompt “safe-x402-payment”
- [functional] New resource “NullClear Live Protocol Telemetry”
- [functional] New resource “NullClear Quickstart Guide”
- [cosmetic] “nullclear_check_reputation” reworded the description of “agentId”

### 2026-10-16 (score 54)

First indexed and scored.

## MCP tools (3)

### `nullclear_check_reputation` (~92 tokens)

Inspect an AI agent's trust score (0-100), clearing reliability, Sybil wash-trade penalty flags, and corporate KYA backing on Base

Input parameters:

- `agentId` (string, required): The ERC-8004 agent token ID or registered identifier (e.g. '124595')
- `chainId` (number): Base chain ID (8453 for Mainnet, 84532 for Sepolia)

### `nullclear_escrow_x402_call` (~255 tokens)

Execute an x402-gated HTTP API call through NullClear deferred schema escrow. The arbiter guarantees payment is only settled if upstream returns valid data matching your schema contract. If the seller hallucinates or crashes, $0 is spent.

Input parameters:

- `fallbacks` (array): Ordered fallback candidates for autonomous multi-seller failover routing (max 3)
- `invariants` (array): Deep value invariants (numeric bounds, regex, forbidden substrings, timestamp freshness)
- `jsonSchema` (object): JSON Schema draft-07 contract that response must strictly satisfy
- `method` (string)
- `minTrustScore` (number): Minimum acceptable trust score for seller (0-100, default 50)
- `rejectRefusals` (boolean): Reject canonical LLM refusal strings (default: true)
- `requiredFields` (array): Field paths that must exist in response
- `sellerAgentId` (string): Seller's agent ID for reputation check and Sybil wash-trade gating
- `spendPolicy` (object): Outbound spend firewall limits (maxPerCallAtomic, maxDailyWalletAtomic)
- `targetUrl` (string, required): Upstream API endpoint demanding x402 payment

### `nullclear_verify_kya_mandate` (~93 tokens)

Verify an agent's Know Your Agent (KYA) corporate liability mandate, active validity, and whether a proposed transaction amount is within corporate limits

Input parameters:

- `agentId` (string, required): The ERC-8004 agent token ID
- `chainId` (number): Base chain ID (default 8453)
- `transactionAmountUsd` (number, required): Amount in USD intended to spend in the transaction

## Diagnostics

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

## Score history

- 2026-10-17: 64
- 2026-10-16: 54

## Common questions

### What is the NullClear Arbiter MCP server?

NullClear Arbiter is an MCP server listed in the public MCP registry as io.github.mithgalalfayez/nullclear. Autonomous x402 payment schema-escrow arbiter, spend firewall, failover & ERC-8004 Sybil oracle. This page covers its hosted endpoint (https://api.nullclear.dev/mcp).

### Is the NullClear Arbiter MCP server safe to use?

NullClear Arbiter scores 64 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the NullClear Arbiter MCP server expose?

NullClear Arbiter exposes 3 tools: nullclear_check_reputation, nullclear_escrow_x402_call, nullclear_verify_kya_mandate. Their descriptions and schemas cost roughly 440 tokens of context every time the server is loaded.

### Does the NullClear Arbiter MCP server require authentication?

No. We connected to NullClear Arbiter without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the NullClear Arbiter MCP server still maintained?

NullClear Arbiter is still listed as active in the MCP registry. We last reached this channel on 17 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://api.nullclear.dev/mcp
- Repository: https://github.com/Nullclear-Protocol/nullclear
- Website: https://nullclear.dev/
- Changelog RSS feed: https://verifymcp.io/servers/mithgalalfayez-nullclear/api.xml
- Changelog JSON feed: https://verifymcp.io/servers/mithgalalfayez-nullclear/api.json
- HTML version of this page: https://verifymcp.io/servers/mithgalalfayez-nullclear/api