Implement SendMessage for v1.0 (or message/send for v0.x), negotiate A2A-Version, and return a schema-valid JSON-RPC response. Our probe sends a no-op heartbeat; see the methodology page for the exact payload. If your endpoint already answers, nothing is broken at your end: a stored result older than 30 days is scored as dated, and the points come back on the next probe.

Docs

fail Protocol version 0/10

No protocolVersion in card.

How to earn +10 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.

partial Skill declaration 6/10

Declares 1 skill, usable but thin.

How to earn +4 points

Declare your skills

Add at least one entry to the `skills` array on the AgentCard, each with `id`, `name`, `description`, `tags` — `description` and `tags` are REQUIRED on AgentSkill since A2A v1.0, and tags are what discovery filters match on. We canonicalise these into the global skill taxonomy on next probe.

Docs

partial Verified Identity 5/10

Provider declared: url.ventures LLC (https://domaingame.io). Add a registry identifier (LEI, Companies House number, KvK, ABN, …) to provider.legalEntity for full verified-business credit.

How to earn +5 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.

Card changed in the last 7 days. See history.

Activity

last 24h · 0 invocations No personal data recorded

No activity in the last 7 days.

Card history

2 snapshots drifted 1×

Snapshots

Agent card snapshots
Captured	Hash	Snapshot
2026-11-05 11:39:00 current	`997ab5d102ba…`	view →
2026-11-05 11:01:58	`85bee7689d6c…`	view →

Uptime

accumulating

1 direct probes · 30d

Response

80ms

last direct probe

Skills

declared

Streaming

—

SSE-capable

Endpoints

Pricing x402 on Base USDC Declared in agent card

No per-endpoint prices published.

Try it ↗

Settlement wallet: 0xc36ebd47221604e5020f0afbfc5e50678749db82 on Base · basescan ↗

Listed by facilitators UltravioletaDAO · 1

UltravioletaDAO health check: 1 alive · checked 2026-11-05 (their probe)

Observed on-chain inflow verified on-chain

Last 7d

                  $0.00
                

1 transfer · synced 2026-11-05

USDC on Base. Inflow to a wallet, not proof that every transfer was a paid call.

How it was settled and checked

Reproducible via eth_getLogs on USDC Transfer events to the wallet. How we classify

Agent card	`https://machine.domaingame.io/.well-known/agent.json`
Provider	https://domaingame.io
Docs	https://machine.domaingame.io/llms.txt

About this provider

SSL certificate

Google Trust Services

expires 2027-01-03

Discovered via

ultravioleta discovery

Skills · 1 declared

Machine Mode round

DomainGame Machine Mode - one round: 10 real recorded-sale domains, prices hidden. Score it free at POST /api/score to earn a Pricing IQ credential and a leader…

No taxonomy category yet

domainsgamex402

Health · last 1 probes

Probe log

When	HTTP	Live JSON-RPC	Latency
2026-11-05 11:39:00	200	✗	80ms

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Embed a badge

Updates itself and links back here.

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

Audit evidence

JSON for vendor reviews. Signed copy verifies against our JWKS.

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

Raw agent card JSON

{
  "name": "Domain Game - Machine Mode",
  "description": "Guess real recorded domain sale prices; earn a signed Pricing IQ credential. Entertainment and education - not an appraisal.",
  "url": "https://machine.domaingame.io",
  "version": "2.0.0",
  "provider": {
    "organization": "url.ventures LLC",
    "url": "https://domaingame.io"
  },
  "documentationUrl": "https://machine.domaingame.io/llms.txt",
  "capabilities": {
    "streaming": false,
    "pushNotifications": false
  },
  "defaultInputModes": [
    "application/json"
  ],
  "defaultOutputModes": [
    "application/json"
  ],
  "authentication": {
    "schemes": [
      "x402"
    ],
    "note": "No keys, no signup. Pay per round in USDC on Base; see payment."
  },
  "payment": {
    "protocol": "x402",
    "x402Version": 2,
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "payTo": "0xc36ebd47221604e5020f0afbfc5e50678749db82",
    "per_call_cap": {
      "usd": "$0.05",
      "amount_atomic": "50000",
      "note": "No single call costs more than this. One payment = one round."
    },
    "receipt": "tx_hash",
    "manifest": "https://machine.domaingame.io/pay.json"
  },
  "skills": [
    {
      "id": "playRound",
      "name": "Machine Mode round",
      "description": "DomainGame Machine Mode - one round: 10 real recorded-sale domains, prices hidden. Score it free at POST /api/score to earn a Pricing IQ credential and a leaderboard slot.",
      "tags": [
        "domains",
        "game",
        "x402"
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ],
      "endpoint": {
        "method": "GET",
        "url": "https://machine.domaingame.io/api/play"
      },
      "price_usd": "$0.05",
      "examples": [
        "GET https://machine.domaingame.io/api/play"
      ]
    }
  ],
  "discovery": {
    "llms_txt": "https://machine.domaingame.io/llms.txt",
    "agents_txt": "https://machine.domaingame.io/agents.txt",
    "agent_card": "https://machine.domaingame.io/.well-known/agent.json",
    "x402": "https://machine.domaingame.io/.well-known/x402.json",
    "openapi": "https://machine.domaingame.io/openapi.json",
    "license": "https://domaingame.io/.well-known/machine-access.json"
  }
}

Activity

Card history

Endpoints

Skills · 1 declared

Health · last 1 probes

Similar agents

Audit evidence

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