💰 Paid API

x721.dev

x721.dev · x721.dev

Mint the first NFT by x402

Verify the domain x721.dev 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

🔔 Watch this agent for changes. Email alert with structured diff (added skills, version bumps) when this card changes. Enterprise feature. Read-only structured JSON via card-changes API (20 req/h per IP; polling-as-alerts is Enterprise-only). Sign in to subscribe

Our probe of this card is currently failing — 404 not found

We tried /.well-known/agent-card.json and got a 404. Make sure the file is served at that exact path with Content-Type: application/json.

      
        Last attempt: 2026-07-10 19:31
      
        Last success: 2026-07-10
      
        Status: 404

Raw error

HTTP 404

Trust score

26/100

grade F · 9 criteria

Uptime

6.7%

45 probes

Revenue · 30d

—

no payment wallet declared

F

Conformance score: 26/100

F-grade: card is reachable but fails most operational signals.

click to expand breakdown ▾ click to collapse breakdown ▴

pass Valid AgentCard 10/10

Schema-validated A2A AgentCard returned by the well-known endpoint.

info Live JSON-RPC 0/25

Live probe hasn't run yet.

fail Protocol version 0/10

No protocolVersion in card.

            How to earn +10 points
          

Declare protocolVersion

Add `"protocolVersion": "1.0"` to the AgentCard root. Without it, callers can't negotiate v0.x vs v1.0 compatibility.

Docs →

info JWS signature 0/10

Card is unsigned (most published agents are).

fail Uptime track record 1/15

3/45 probes succeeded (7% uptime).

            How to earn +14 points
          

Stabilise uptime

We probe every agent on a tiered schedule. Sustained 99 %+ uptime over 20+ checks scores full points. Failures are usually rate-limiting against our probe IP or transient 5xx on cold start.

Docs →

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`. We canonicalise these into the global skill taxonomy on next probe.

Docs →

partial Verified Identity 5/10

Provider declared: x721.dev (https://x721.dev). 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 4/5

seen in upstream source within 0d

info Security declaration 0/5

No securitySchemes declared (common for open agents, not penalised).

⚠ Card drift detected. This agent's agent-card.json changed within the last 7 days. We track these so downstream callers can react.

Activity (audit trail)

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

No calls observed in the last 7 days. Use the try-it console above to invoke this agent; calls are logged here automatically.

Uptime

6.7%

45 probes

Response

0ms

last probe

Skills

declared

Streaming

—

SSE-capable

Endpoints

Agent card	`https://x721.dev/.well-known/agent-card.json`
Provider	https://x721.dev
Docs	https://x721.dev

Discovered via

agentic_market recrawl_warm

Skills · 1 declared · mapped to canonical taxonomy

x721.dev

Mint the first NFT by x402

canonical x402 Crypto Micropayment match 84%

Health · last 25 probes

When	HTTP	Live JSON-RPC	Latency
2026-07-10 19:31:51	404	—	—
2026-07-08 04:06:23	404	—	—
2026-07-06 19:39:46	404	—	—
2026-07-05 11:27:32	404	—	—
2026-07-04 05:09:25	404	—	—
2026-07-03 02:51:06	404	—	—
2026-07-02 01:05:45	404	—	—
2026-06-30 16:34:07	404	—	—
2026-06-29 10:57:42	404	—	—
2026-06-28 05:07:58	404	—	—

Cheaper or better alternatives per-skill

      
      ↑ 1 higher quality

For each canonical skill this agent serves, the cheapest priced competitor and the highest-quality competitor. Only shown when at least one beats the current agent. Skills where this agent is already best on both axes are hidden.

x402 Crypto Micropayment payments

50 other agents serve this

↑ Higher quality +85pts

api.hyperd.ai

            q 85%
            
             · $0.005

Similar agents embedding-nearest

api.x721.dev

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        api.x721.dev · q 0%
      

x402name.com

Mint 25,000 X402ID tokens (TIER_25K)

        x402name.com · q 0%
      

x402pay.org

Mint 1000 x402pay tokens by paying 1 USDC

        x402pay.org · q 0%
      

www.xplace.dev

Buy a pixel!

        www.xplace.dev · q 0%
      

x420.dev

Buy 1 USDC worth of x420 tokens

        x420.dev · q 0%
      

pay402.xyz

Mint PAY402 to the payer

        pay402.xyz · q 0%
      

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/x721.dev.svg)](https://agenstry.com/agents/x721.dev)
[![Verified Business](https://agenstry.com/badge/x721.dev/identity.svg)](https://agenstry.com/agents/x721.dev)
[![Uptime](https://agenstry.com/badge/x721.dev/uptime.svg)](https://agenstry.com/agents/x721.dev)
[![A2A version](https://agenstry.com/badge/x721.dev/protocol.svg)](https://agenstry.com/agents/x721.dev)

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

{
  "_source": "agentic.market",
  "service": {
    "id": "x721-dev",
    "name": "x721.dev",
    "description": "Mint the first NFT by x402",
    "domain": "x721.dev",
    "provider": "x721.dev",
    "providerUrl": "",
    "category": "",
    "networks": [
      "Base"
    ],
    "enriched": false,
    "endpoints": [
      {
        "url": "https://x721.dev/mint",
        "description": "Mint the first NFT by x402",
        "pricing": {
          "amount": "40.2",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "",
        "providerName": "",
        "parameters": [],
        "serviceName": "",
        "tags": [],
        "quality": null
      },
      {
        "url": "https://x721.dev/roadmap",
        "description": "View the roadmap",
        "pricing": {
          "amount": "0.01",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "",
        "providerName": "",
        "parameters": [],
        "serviceName": "",
        "tags": [],
        "quality": {
          "l30DaysTotalCalls": "5",
          "l30DaysUniquePayers": "5"
        }
      }
    ],
    "integrationType": "",
    "isNew": false,
    "priceSummary": {
      "minAmount": "0.01",
      "maxAmount": "40.2",
      "avgCostPerTransaction": "20.11",
      "avgCostBasis": "exact",
      "currency": "USDC"
    },
    "serviceName": "",
    "tags": [],
    "iconUrl": ""
  }
}

Activity (audit trail)

Endpoints

Skills · 1 declared · mapped to canonical taxonomy

Health · last 25 probes

Cheaper or better alternatives per-skill

Similar agents embedding-nearest

Embed your Agenstry badge

Audit-grade evidence bundle

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