MCP.Market

NullClear Arbiter MCP server

online · 100% uptime
by mithgalalfayez·io.github.mithgalalfayez/nullclear·v1.1.1·1 stars
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Autonomous x402 payment schema-escrow arbiter, spend firewall, failover & ERC-8004 Sybil oracle

B82/100grade B
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Safety scan
B82/100

full report

Adoption
Growing

1 stars

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If you have run it, two minutes of your experience saves the next person an afternoon.

NullClear Arbiter tools (3, 1 write)

write = sends, deletes, buys or posts
  • nullclear_check_reputationFree

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

  • nullclear_escrow_x402_callwrite actionFree

    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.

  • nullclear_verify_kya_mandateFree

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

Public scan report

scanner v0.1.10 · 2026-10-16 · same rubric, same numbers if you re-run it

1 high
  • Code scan3 source files scanned25/25
  • Live reliabilityremote reachable in 274ms20/20
  • Tool poisoning3 tool descriptions checked15/15
  • Auth qualityopen endpoint exposes 1 write-action tools with no auth3/15
  • Maintenancelast push 0 days ago15/15
  • Maintainer identitynamespace and repository owner differ4/10

Findings (1)

  • highWrite-action tools reachable without authenticationauth.open-write
Overall 82/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How NullClear Arbiter compares

Against every graded Finance MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
82/100
higher than 73% of 1,761 Finance servers
Tools
3
the typical Finance server has 8
Tools that change things
33%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote Finance server answers 100%
Response time
248 ms
faster than 57% of 1,133 Finance servers
GitHub stars
1
more than 65% of 946 Finance servers

What its tools let an agent do: 2 read · 1 change

Install NullClear Arbiter in Claude Code, Cursor or VS Code

claude mcp add --transport http nullclear https://api.nullclear.dev/mcp
Add to Cursor

What the publisher says

From the NullClear Arbiter repository's README, as published. We do not edit it. Read it on GitHub

NullClear (nullclear.dev / nullclear.com)

Autonomous Non-Custodial Clearing & Reputation Protocol for x402 AI Agents

NullClear eliminates payment risk in Agent-to-Agent (A2A) commerce. In standard HTTP 402 Payment Required flows, buyers are forced to pay before seeing whether an upstream agent hallucinates, crashes, or returns malformed data. NullClear introduces deferred non-custodial schema escrow: the buyer signs an EIP-3009 TransferWithAuthorization, the arbiter cryptographically validates the upstream agent's output against the buyer's schema contract, and only settles payment upon 100% verification. If the seller hallucinates or crashes, the authorization is voided and $0 is spent.

Architecture Overview

┌──────────────────────────────────────────┐
                      │              BUYER AGENT                 │
                      │  (@nullclear/x402-arbiter client/fetch)   │
                      └─────────────────────┬────────────────────┘
                                            │
                          1. Target request │ (Intercepted 402)
                          2. EIP-3009 signed│ & Schema defined
                                            ▼
                      ┌──────────────────────────────────────────┐
                      │          NULLCLEAR ARBITER               │
                      │     (Cloudflare Worker + Hono)           │
                      │  - Sybil & Wash-Trade Engine             │
                      │  - Deterministic JSON Schema Validator   │
                      │  - EIP-712 Receipt Attestation           │
                      └─────────────┬──────────────┬─────────────┘
                                    │              │
                   3. Proxy Request │              │ 4. If Valid: Settle
                      with Escrow   │              │    If Invalid: VOID ($0)
                                    ▼              ▼

Monorepo Packages

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

NullClear Arbiter: common questions

Is NullClear Arbiter MCP server safe?
Mostly: it is graded B (82/100). Read the NullClear Arbiter safety report
How do I install NullClear Arbiter?
It runs remotely at api.nullclear.dev. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does NullClear Arbiter need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is NullClear Arbiter maintained?
The last commit was 19 days ago (2026-10-16). The latest release is v1.1.1.
Is NullClear Arbiter up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of NullClear Arbiter?
Servers from other publishers that do the same job: three.ws Agent Payments MCP server, X402 List MCP server and SatGate – Economic Firewall for AI Agents MCP server. Compare all NullClear Arbiter alternatives.
How does NullClear Arbiter compare with other Finance MCP servers?
safety score 82/100 (higher than 73% of 1,761 Finance servers); tools 3 (the typical Finance server has 8); tools that change things 33% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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