{
  "page": "https://x402-list.com/apis/nft-api",
  "title": "NFT APIs you can pay per call",
  "answer": "As of November 13, 2026, x402-list compares 5 NFT services with NFT-specific endpoints. The median selected call costs $0.01. A contract check, a holdings lookup and a mint builder are different products: compare the returned data and the chain before paying.",
  "date_modified": "2026-11-13",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "cite_as": "x402-list, \"NFT APIs you can pay per call\", https://x402-list.com/apis/nft-api, data as of 2026-11-13. Licensed CC BY 4.0.",
  "how_to_cite": "Quote the number with its date and link the page URL. Data is CC BY 4.0: attribution to x402-list is required.",
  "methodology": "https://x402-list.com/methodology",
  "criteria": {
    "listed": "online, payment-ready, 30-day uptime >= 90%, known price, description >= 80 characters",
    "price": "cheapest current NFT endpoint of each service, USD per call (not its cheapest tool of any kind); services without one are left out",
    "generalist": "a gateway matching more than three unrelated capabilities: listed, never called the cheapest",
    "buyers_30d": "distinct wallets that paid the service on-chain in the last 30 days (measured floor)",
    "best": "most distinct buyers in 30 days; ties go to higher 30-day uptime"
  },
  "in_index": true,
  "stats": {
    "services": 5,
    "with_buyers_30d": 4,
    "median_price_usd": 0.01,
    "min_price_usd": 0.001,
    "max_price_usd": 0.1,
    "generalists": 0,
    "left_out_no_task_endpoint": 2
  },
  "faq": [
    {
      "question": "Is a zero-price NFT option available?",
      "answer": "The 5 listed services have positive per-call prices for their task endpoints. A free sample, a free catalog or a test network does not establish a zero-price paid route."
    },
    {
      "question": "What do 100,000 calls cost?",
      "answer": "At the median selected quote, 100,000 calls total $1,000.00 at $0.01 per call. This reference calculation assumes the same request shape and excludes network fees, payments inside built transactions and retries."
    },
    {
      "question": "Does a mint builder fee pay for the NFT?",
      "answer": "No. The builder fee pays for an unsigned transaction. The mint payment inside that transaction, the network fee and the submission are separate, and the token exists only after the signed transaction is confirmed."
    },
    {
      "question": "Does an ERC-721 classification prove who owns a token?",
      "answer": "No. A standard check describes the contract. Ownership is a separate lookup of the current holder, true at the block it was read from."
    },
    {
      "question": "Does paying a transfer fee move an NFT?",
      "answer": "Not by itself. A route that charges a fee for an action the caller performs returns no NFT data and does not move the token, so it is not compared here."
    },
    {
      "question": "Do these prices include floor prices or sales data?",
      "answer": "Only if a listed endpoint returns them. Market prices of a collection come from marketplace sales, a different data type from contract checks, holdings and mint builders."
    },
    {
      "question": "Does an answer for one chain hold on another?",
      "answer": "No. The same address can hold a different contract, or nothing, on another chain. Keep the chain and network identifier with every result."
    },
    {
      "question": "Does HTTP 402 establish a correct paid answer?",
      "answer": "It establishes a payment requirement for the request. A stored challenge, an observed payment and a correct response are different evidence. Inspect the resource and the request schema before using payment terms."
    }
  ],
  "services": [
    {
      "name": "OneSource",
      "reseller_of_brand_via": null,
      "url": "https://x402-list.com/services/onesource",
      "price_usd_per_call": 0.005,
      "networks": [
        "Base"
      ],
      "uptime_30d": 100,
      "latency_ms": 224,
      "buyers_30d": 1267,
      "last_checked_at": "2026-11-13T17:53:45.335Z",
      "what_it_does": "Ethereum RPC service whose contract introspection classifies an address as ERC-20-like, ERC-721 or ERC-1155.",
      "generalist": false,
      "price_endpoint": {
        "method": "GET",
        "path": "/api/chain/contract/:address"
      },
      "task_endpoints": [
        {
          "method": "GET",
          "path": "/api/chain/contract/:address",
          "price_usd_per_call": 0.005
        }
      ],
      "endpoints_listed": 10
    },
    {
      "name": "APEX: Arc launch data and web pages for agents",
      "reseller_of_brand_via": null,
      "url": "https://x402-list.com/services/apex-on-x1",
      "price_usd_per_call": 0.001,
      "networks": [
        "Base",
        "SOL"
      ],
      "uptime_30d": 99.3,
      "latency_ms": 192,
      "buyers_30d": 21,
      "last_checked_at": "2026-11-13T17:50:08.316Z",
      "what_it_does": "Pay-per-call x402 tools for AI agents.",
      "generalist": false,
      "price_endpoint": {
        "method": "GET",
        "path": "/api/x402/nft-info"
      },
      "task_endpoints": [
        {
          "method": "GET",
          "path": "/api/x402/nft-info",
          "price_usd_per_call": 0.001
        },
        {
          "method": "GET",
          "path": "/api/x402/tx-explain",
          "price_usd_per_call": 0.003
        }
      ],
      "endpoints_listed": 19
    },
    {
      "name": "InsumerAPI",
      "reseller_of_brand_via": null,
      "url": "https://x402-list.com/services/insumerapi",
      "price_usd_per_call": 0.05,
      "networks": [
        "ARB",
        "Base",
        "POL",
        "SOL"
      ],
      "uptime_30d": 100,
      "latency_ms": 266,
      "buyers_30d": 6,
      "last_checked_at": "2026-11-13T17:53:00.717Z",
      "what_it_does": "Wallet auth for AI agents and developers.",
      "generalist": false,
      "price_endpoint": {
        "method": "POST",
        "path": "/v1/attest"
      },
      "task_endpoints": [
        {
          "method": "POST",
          "path": "/v1/attest",
          "price_usd_per_call": 0.05
        },
        {
          "method": "POST",
          "path": "/v1/trust",
          "price_usd_per_call": 0.15
        }
      ],
      "endpoints_listed": 3
    },
    {
      "name": "RelayShield",
      "reseller_of_brand_via": null,
      "url": "https://x402-list.com/services/relayshield",
      "price_usd_per_call": 0.1,
      "networks": [
        "Base",
        "SOL"
      ],
      "uptime_30d": 100,
      "latency_ms": 218,
      "buyers_30d": 6,
      "last_checked_at": "2026-11-13T17:53:21.192Z",
      "what_it_does": "RelayShield threat screening for agents, priced per call in USDC on Base and Solana via x402 v2.",
      "generalist": false,
      "price_endpoint": {
        "method": "POST",
        "path": "/v1/payg/nft-security"
      },
      "task_endpoints": [
        {
          "method": "POST",
          "path": "/v1/payg/nft-security",
          "price_usd_per_call": 0.1
        }
      ],
      "endpoints_listed": 39
    },
    {
      "name": "fry.farm x402 Agentic Actions",
      "reseller_of_brand_via": null,
      "url": "https://x402-list.com/services/fry-farm-x402-agentic-actions",
      "price_usd_per_call": 0.01,
      "networks": [],
      "uptime_30d": 99.4,
      "latency_ms": 247,
      "buyers_30d": null,
      "last_checked_at": "2026-11-13T17:53:33.221Z",
      "what_it_does": "Algorand transaction builders, including an unsigned mint group for its Genesis NFT.",
      "generalist": false,
      "price_endpoint": {
        "method": "POST",
        "path": "/x402/actions/genesis-mint/mint/build"
      },
      "task_endpoints": [
        {
          "method": "POST",
          "path": "/x402/actions/genesis-mint/mint/build",
          "price_usd_per_call": 0.01
        }
      ],
      "endpoints_listed": 15
    }
  ]
}