{"uid":"cap_ER8Jg5DkTuyakLbtkHFgv","slug":"x402-toolbox-nft-balance-checker-432258ab","name":"x402-toolbox NFT Balance Checker","description":"309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.","url":"https://x402-toolbox.shablony-pro.workers.dev/chain/nft-balance?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"schema":{"type":"string"}}},"responseSchema":{"type":"json","example":{"ok":true,"paid":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_nLx6UnlRb1gVhidP61L9I","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the NFT (non-fungible token) balance for a given blockchain address on a specified chain, paid per-call via x402/USDC with no API key required.","exampleAgentPrompt":"Check the NFT balance on Base chain for wallet address 0xAbCd1234... — pay the micro-fee automatically with USDC, no API key needed.","exampleUseCases":[{"title":"Verify NFT ownership for gating","prompt":"Check whether wallet 0x1234abcd...5678 holds any NFTs on Base — I need to know if they qualify for our token-gated community."},{"title":"Portfolio audit for NFT holdings","prompt":"How many NFTs does the wallet 0xdeadbeef...cafe currently have on Base? I'm auditing my on-chain portfolio."},{"title":"Agent-triggered NFT balance monitoring","prompt":"Every time my agent runs a task, check the NFT balance of 0xAABBCCDD...1122 on Base and alert me if it drops to zero."}],"resultDescription":"A JSON object with an 'ok' boolean indicating success, a 'paid' boolean confirming the x402 micro-payment was accepted, and the NFT balance data for the queried address on the specified chain.","failureModes":["Invalid or malformed wallet address returns an error response","Unsupported chain schema returns a bad request","Payment failure (insufficient USDC or wallet issue) prevents the call from executing","Rate limits or Cloudflare Worker timeouts on high-volume requests","Missing required schema parameter results in an ambiguous or empty response"],"whenToPreferThis":"Choose this endpoint when you need a frictionless, no-signup NFT balance lookup payable per-call in USDC over x402, especially in autonomous agent workflows where managing API keys is undesirable. It is ideal for Base chain queries and micro-payment-native pipelines.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:48:59.479Z","isFirstParty":false,"canonicalSlug":"x402-toolbox-nft-balance-checker-432258ab"}