{"id":"b633cda9-7695-4e11-aab5-4f249a7fc325","shortId":"nMG4FW","kind":"x402","title":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/nfts/29` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific resource appears to serve NFT-related data (inferred from the URL path `/nfts/29`), though the provider's landing page does not explicitly list this particular endpoint among its advertised APIs. The endpoint is live and returns a valid x402 challenge.\n\nPricing is $0.02 per request, paid in USDC on the Base network. The x402 challenge specifies a `maxAmountRequired` of 20,000 base units of USDC (contract `0x8335…2913`, 6 decimals), which equals $0.02. Payment is made via the `exact` scheme with no API keys, subscriptions, or rate limits required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The response MIME type is `application/json`.\n\nThe platform advertises a broad set of endpoints (analytics, AI sentiment/summarization/classification/embeddings, finance price feeds, crypto gas estimates, geocoding, validation, and more), all at the same $0.02 per-call price point. However, documentation beyond the landing page is essentially absent — the `/api`, `/pricing`, and `/README` routes all return only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples for any endpoint, including this one.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","nft-data","json-response","no-api-key","no-rate-limit"],"categories":["web3","data"],"synonyms":["NFT API","NFT data endpoint","pay-per-call API","x402 API","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["The /api/v1/nfts/29 endpoint is not listed among the provider's advertised APIs on the landing page — its purpose and data content are inferred solely from the URL path.","No request or response schema documentation exists for any endpoint on this platform.","The /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no useful content.","Without documented response schemas, callers cannot know what fields or data structure to expect."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/29","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/nfts/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on what this NFT endpoint accepts or returns. The /nfts/29 path is not listed on the provider's own landing page, and no OpenAPI spec, examples, or response schemas are available. This is effectively a stub 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'/api/v1/nfts/29':32 '/nfts/29':74 '/pricing':213 '/readme':215 '0.02':10,24,104,134,196 '000':122 '0x8335':128 '20':121 '2913':129 '6':130 'Base network API' 'NFT API' 'NFT data endpoint' 'USDC micropayment API' 'absent':210 'advertis':90,173 'ai':180 'ai/ml':53 'among':88 'analyt':52,179 'api':49,91,144 'appear':62 'application/json':170 'attach':153 'base':8,22,112,123 'beyond':204 'broad':175 'call':48,199 'caller':151 'challeng':101,116 'collect':40 'connect':221 'contract':127 'crypto':185 'data':5,19,51,68 'decim':131 'detail':228 'document':203,237 'endpoint':6,20,30,87,93,178,243 'equal':133 'essenti':209 'estim':187 'exact':140 'exampl':240 'explicit':83 'feed':184 'financ':182 'finance/web3':55 'gas':186 'gate':3,17 'geocod':188 'header':158 'howev':202 'includ':244 'infer':54,69 'infrastructur':57 'json-response' 'key':145 'land':79,206 'limit':149 'list':84 'live':95 'lowpaymentfee' 'lowpaymentfee.com':37 'made':137 'maxamountrequir':119 'mime':167 'network':113 'nft':4,18,66 'nft-data' 'nft-relat':65 'no-api-key' 'no-rate-limit' 'one':246 'openapi':232 'page':80,207 'paid':107 'part':34 'particular':86 'path':73 'pay':9,23,46 'pay-per-cal':45 'pay-per-call API' 'payment':135,157,163 'per':11,25,47,105,198 'per-cal':197 'per-call-pricing' 'platform':38,172 'point':201 'price':102,183,200 'prompt':223 'proof':164 'protocol':44 'provid':77 'rate':148 'relat':67 'request':12,26,106 'request/response':235 'requir':150 'resourc':61 'respons':166 'return':97,218 'rout':216 'schema':236 'scheme':141 'sentiment/summarization/classification/embeddings':181 'serv':64 'set':176 'simpli':152 'span':50 'spec':233 'specif':60 'specifi':117 'subscript':146 'technic':227 'though':75 'type':168 'unit':124 'url':72 'usdc':14,28,109,126 'usdc-base' 'util':58 'valid':99,161,189 'via':138 'wallet':222 'x':156 'x-payment':155 'x402':2,16,43,100,115,162 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"edb8d7f4-163f-4c5e-987b-47b241148cdf","listingId":"b633cda9-7695-4e11-aab5-4f249a7fc325","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/nfts/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.741Z"}],"sources":[{"listingId":"b633cda9-7695-4e11-aab5-4f249a7fc325","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.741Z","lastSeenAt":"2026-04-22T02:32:08.921Z"}],"details":{"listingId":"b633cda9-7695-4e11-aab5-4f249a7fc325","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/29 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/29"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/29"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists analytics, AI/ML, finance/Web3, and infrastructure endpoints but does not list /api/v1/nfts/29","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for token ID 29 via a single paid request","Integrating pay-per-call NFT data into an agent workflow without managing API keys","Programmatic access to NFT information settled on Base L2 in USDC"],"bestFor":["Developers wanting zero-signup, pay-as-you-go NFT data access","AI agents that can settle x402 payments autonomously on Base","Prototyping workflows that need on-demand NFT information without rate limits"],"notFor":["Production use cases requiring documented request/response schemas and SLAs","Bulk NFT data retrieval where per-call costs would accumulate significantly","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.95Z"},"updatedAt":"2026-04-22T02:32:08.921Z"}}