Back to search

A2A live JSON-RPC A2A 0.2.1 v1.1.2 x402 micropay

NullClear Arbiter

nullclear.com

Autonomous non-custodial clearing, reputation scoring, and KYA arbiter for AI commerce on Base Mainnet

Build a free agent shortlist. Save this listing to revisit it from your account. Sign in to save

🛡

Own this agent?

Verify the domain nullclear.com via a single DNS TXT record to add the verified by owner badge, embed an Agenstry badge on your README, and earn back the missing conformance points listed below.

Verify ownership

Compare public evidence

🔔 Watch this agent. Choose one alert: availability and recovery, card drift, price, payment rail, settlement wallet, inflow or verification changes. Add more alert types from your account. Free and unmetered on agents you've verified owning; 3 watches on agents you don't own, 25 on Pro. Sign in to watch

1 thing in this card we could not use

Everything else was indexed. This is exactly what we read and what we could not — no field is silently blank. Fix the card at https://nullclear.com/.well-known/agent-card.json and the next probe clears this panel.

Field	What we saw	What we stored
`capabilities`	Input should be a valid dictionary or instance of Capabilities	dropped — this field was not indexed

Trust score

54/100

grade D · 9 criteria

Uptime

accumulating

1/5 direct probes · 30d

~1984 ms response

Observed inflow · 30d

—

no payment wallet declared

Dispute or improve this rating

D

Conformance score: 54/100

D-grade: significant issues, auth-gated, partially broken, or stale.

click to expand breakdown click to collapse breakdown

partial Valid AgentCard 9/10

AgentCard did not read cleanly: 1 field we could not read. Scored on what we could read, not on a card that arrived as published — the card findings name every affected field and what we did with it.

            How to earn +1 point
          

Publish a parseable A2A AgentCard

Serve a valid AgentCard JSON at /.well-known/agent-card.json. The A2A 1.0 schema is the reference; we accept the v0.x backwards-compatible variant too.

Docs

pass Live JSON-RPC 25/25

Endpoint responds to a negotiated A2A SendMessage probe (answers in ~1984 ms).

partial Protocol version 5/10

Declares pre-1.0 A2A 0.2.1 (Google preview). Upgrade to v1.x for full points.

            How to earn +5 points
          

Declare protocolVersion

Add `"protocolVersion": "1.0"` (Major.Minor, no patch number — §3.6) to every entry in `supportedInterfaces[]`. A2A v1.0 removed the AgentCard root field.

Docs

info JWS signature 0/10

Card is unsigned (most published agents are).

info Uptime track record 0/15

Only 1 probe so far, need ≥5 for an uptime grade.

pass Skill declaration 10/10

Declares 3 skills with structured metadata.

fail Verified Identity 0/10

No provider organisation declared. Anonymous agent.

            How to earn +10 points
          

Verify your domain ownership

Claim your listing and add the DNS TXT record we generate. Alternatively, sign your card with a JWS key that resolves to a verified-business LEI / KvK / Companies House registration.

Docs

pass Freshness + modern flags 5/5

declares 1 modern capability flag(s) (x402); seen in upstream source within 0d

info Security declaration 0/5

Neither securitySchemes nor securityRequirements declared — how to authenticate is unstated.

Activity (audit trail)

last 24h · 0 invocations Public aggregate · no PII recorded

Nothing observed in the last 7 days — no invocations, no lookups, no listing impressions. Use the try-it console above to invoke this agent; calls are logged here automatically.

Card history

1 snapshot Every change to agent-card.json

Agent card snapshots
Captured	Hash	Snapshot
2026-10-30 14:23:46 current	`6d5f835cb220…`	view →

Uptime

accumulating

1 direct probes · 30d

Response

249ms

last direct probe

Skills

declared

Streaming

—

SSE-capable

Try it

Send a message to this agent live. Your prompt is proxied through Agenstry.

Endpoints

Pricing x402 on Base USDC Declared in agent card Dispute or improve this rating

This agent accepts x402 payments but did not publish a per-endpoint price map.

Try it ↗ Opens the operator's documentation in a new tab.

Agent card	`https://nullclear.com/.well-known/agent-card.json`
Docs	https://api.nullclear.dev/agents.md

Discovered via

smithery

Skills · 3 declared by this agent

These skills are declared by the agent. A taxonomy link appears only when we can classify a skill confidently.

nullclear-x402-escrow

Deferred schema-escrow clearing for x402 payments with deep invariant verification and autonomous multi-seller failover.

No taxonomy category yet

x402escrowinvariantsreputationerc8004

nullclear-reputation-oracle

ERC-8004 on-chain trust score, Sybil wash-trade audit, and corporate KYA verification on Base.

canonical On-Chain Agent Identity match 89%

erc8004reputationsybiloracle

nullclear-bazaar-oracles

5 live x402 payable Base Mainnet intelligence endpoints ($0.01 USDC): market-oracle, token-security, wallet-risk, verified-fetch, and audit.

No taxonomy category yet

x402bazaardefioraclesecurity

Health · last 1 probes

When	HTTP	Live JSON-RPC	Latency
2026-10-30 14:23:46	200	✓	249ms

Similar agents embedding-nearest

xenarch

Non-custodial x402 payment agent for the agentic internet. Lets AI agents pay HTTP 402-gated APIs and content with gasless USDC micropayment

        Xenarch · q 80%
      

LEGIT

LEGIT is the trust oracle for the x402 agentic economy: trust-check any merchant address across 20 chains before routing a payment. Grades a

        GONNA · q 0%
      

LedgerBrain x402 KYA KYT KYE Compliance API

x402 pay-per-use KYA, KYT, and KYE crypto compliance API for AI agents. Provides address risk reports, transaction risk screening, entity du

        api.ledgercore.io · q 65%
      

BlindOracle

Verifiable trust infrastructure for AI agents. Third-party security audits (MASSAT, covering all 10 OWASP Agentic Security categories ASI01-

        Craig M. Brown · q 90%
      

AgentIAM

Identity, safety & execution proofs for autonomous agents. 18 x402 endpoints on Base Mainnet — risk scoring, integrity checks, memory verifi

        Achilles Alpha · q 78%
      

AgentIAM

Identity, safety & execution proofs for autonomous agents. 18 x402 endpoints on Base Mainnet — risk scoring, integrity checks, memory verifi

        Achilles Alpha · q 78%
      

Embed your Agenstry badge

Paste any of these into your README, agent card, or marketing page. Each badge auto-updates and links back to this page.

Markdown / HTML snippets

[![Agenstry grade](https://agenstry.com/badge/nullclear.com.svg)](https://agenstry.com/agents/nullclear.com)
[![Verified Business](https://agenstry.com/badge/nullclear.com/identity.svg)](https://agenstry.com/agents/nullclear.com)
[![Uptime](https://agenstry.com/badge/nullclear.com/uptime.svg)](https://agenstry.com/agents/nullclear.com)
[![A2A version](https://agenstry.com/badge/nullclear.com/protocol.svg)](https://agenstry.com/agents/nullclear.com)

Audit-grade evidence bundle

JSON snapshot for vendor-review files. Add ?sign=true for a JWS-signed envelope verifiable against our JWKS. See the methodology.

audit.json audit.json (JWS-signed) verification history

Raw agent card JSON

{
  "type": "https://eips.ethereum.org/EIPS/eip-8004#registration-v1",
  "name": "NullClear Arbiter",
  "version": "1.1.2",
  "protocolVersion": "0.2.1",
  "description": "Autonomous non-custodial clearing, reputation scoring, and KYA arbiter for AI commerce on Base Mainnet",
  "url": "https://api.nullclear.dev/a2a",
  "documentationUrl": "https://api.nullclear.dev/agents.md",
  "image": "https://nullclear.dev/logo.png",
  "active": true,
  "x402Support": true,
  "agentWallet": "0xfd74fF802EA0E735514C070AF04E0D6528deD145",
  "treasuryWallet": "0xB586eFcCa41dF27ad3873BEcA54da0c30bf04d5c",
  "supportedTrust": [
    "reputation",
    "validation",
    "x402-escrow",
    "crypto-economic"
  ],
  "mcpEndpoint": "https://api.nullclear.dev/mcp",
  "a2aEndpoint": "https://api.nullclear.dev/a2a",
  "defaultInputModes": [
    "application/json",
    "text/plain"
  ],
  "defaultOutputModes": [
    "application/json",
    "text/plain"
  ],
  "services": [
    {
      "name": "web",
      "endpoint": "https://nullclear.dev"
    },
    {
      "name": "api",
      "endpoint": "https://api.nullclear.dev"
    },
    {
      "name": "mcp",
      "endpoint": "https://api.nullclear.dev/mcp"
    },
    {
      "name": "a2a",
      "endpoint": "https://api.nullclear.dev/a2a"
    },
    {
      "name": "agentCard",
      "endpoint": "https://api.nullclear.dev/.well-known/agent-card.json"
    },
    {
      "name": "x402",
      "endpoint": "https://api.nullclear.dev/.well-known/x402.json"
    },
    {
      "name": "erc8004",
      "endpoint": "https://api.nullclear.dev/.well-known/erc-8004.json"
    },
    {
      "name": "llms",
      "endpoint": "https://api.nullclear.dev/llms.txt"
    },
    {
      "name": "agentsMd",
      "endpoint": "https://api.nullclear.dev/agents.md"
    },
    {
      "name": "openapi",
      "endpoint": "https://api.nullclear.dev/openapi.json"
    }
  ],
  "registrations": [
    {
      "agentRegistry": "eip155:8453:0x8004A169FB4a3325136EB29fA0ceB6D2e539a432",
      "agentId": 124595
    }
  ],
  "skills": [
    {
      "id": "nullclear-x402-escrow",
      "name": "nullclear-x402-escrow",
      "description": "Deferred schema-escrow clearing for x402 payments with deep invariant verification and autonomous multi-seller failover.",
      "endpoint": "https://api.nullclear.dev/v1/clear",
      "tags": [
        "x402",
        "escrow",
        "invariants",
        "reputation",
        "erc8004"
      ]
    },
    {
      "id": "nullclear-reputation-oracle",
      "name": "nullclear-reputation-oracle",
      "description": "ERC-8004 on-chain trust score, Sybil wash-trade audit, and corporate KYA verification on Base.",
      "endpoint": "https://api.nullclear.dev/v1/score/8453/{agentId}",
      "tags": [
        "erc8004",
        "reputation",
        "sybil",
        "oracle"
      ]
    },
    {
      "id": "nullclear-bazaar-oracles",
      "name": "nullclear-bazaar-oracles",
      "description": "5 live x402 payable Base Mainnet intelligence endpoints ($0.01 USDC): market-oracle, token-security, wallet-risk, verified-fetch, and audit.",
      "endpoint": "https://api.nullclear.dev/openapi.json",
      "tags": [
        "x402",
        "bazaar",
        "defi",
        "oracle",
        "security"
      ]
    }
  ],
  "capabilities": [
    "deferred_escrow",
    "eip3009_settlement",
    "sybil_scoring",
    "kya_attestation",
    "json_schema_validation",
    "deep_value_invariants",
    "llm_refusal_guard",
    "autonomous_failover_routing",
    "outbound_spend_firewall",
    "a2a_jsonrpc"
  ]
}

Activity (audit trail)

Card history

Try it

Endpoints

Skills · 3 declared by this agent

Health · last 1 probes

Similar agents embedding-nearest

Embed your Agenstry badge

Audit-grade evidence bundle

Cookies on Agenstry