{"id":"1cf7bb36-e19a-4c33-b5dd-2103180ab17b","shortId":"accT9V","kind":"x402","title":"Pay-per-call NFT data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call NFT data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at `/api/v1/nfts/6` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each call is settled on the Base network using USDC (contract `0x8335…2913`) through the x402 exact-payment scheme. The specific endpoint probed here is labeled \"Premium API Access\" and appears to serve NFT-related data (inferred from the `/nfts/6` path), though no detailed documentation or response schema was found.\n\nPricing is straightforward: the x402 challenge advertises a `maxAmountRequired` of 20,000 base units. USDC uses 6 decimals, so 20000 / 10^6 = $0.02 per request, consistent with the site-wide $0.02/request pricing displayed on the landing page. No API keys are required; payment is handled entirely via the `X-PAYMENT` header. The site claims no rate limits and instant access.\n\nDocumentation is extremely sparse. The landing page lists endpoints with one-line descriptions and prices, but the `/api`, `/pricing`, and `/README` routes all returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no example request/response payloads, and no description of what data the `/nfts/6` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is difficult to know what to POST or what the response structure looks like.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No example request or response payloads found anywhere in crawled content","The exact data returned by /api/v1/nfts/6 is unknown — 'Premium API Access' is a generic label","All non-landing pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content","The platform lists many endpoints but none have detailed docs; quality of actual responses is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/6","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/6","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 402 challenge with clear pricing. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the site pages beyond the landing page are empty. The purpose of the /nfts/6 endpoint is only inferable from its URL path. This is effectively a stub 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'/api/v1/nfts/6':41 '/nfts/6':108,232 '/pricing':201 '/readme':203 '/request':17,34,151 '0.02':16,33,141,150 '000':130 '0x8335':78 '10':139 '20':129 '20000':138 '2913':79 '402':243 '6':135,140 'Base network API' 'NFT API' 'NFT data endpoint' 'USDC micropayment API' 'access':96,181 'actual':234 'addit':214 'advertis':125 'ai/ml':61 'analyt':60 'api':57,95,159 'appear':98 'base':9,26,73,131 'base-network' 'call':4,21,68 'challeng':124,244 'claim':175 'connect':209 'consist':144 'content':215 'contract':77 'data':6,23,59,104,230 'decim':136 'descript':195,227 'detail':112 'difficult':250 'display':153 'document':113,182,247 'enabl':38 'endpoint':7,24,39,89,190,233,237 'entir':166 'exact':84 'exact-pay':83 'exampl':222 'extrem':184 'finance/web3':63 'found':118 'handl':165 'header':172 'infer':62,105 'infrastructur':65 'instant':180 'key':160 'know':252 'label':93 'land':156,187 'like':262 'limit':178 'line':194 'list':189 'live':239 'look':261 'lowpaymentfee' 'lowpaymentfee.com':46 'maxamountrequir':127 'network':74 'nft':5,22,102 'nft-data' 'nft-relat':101 'no-api-key' 'offer':49 'one':193 'one-lin':192 'openapi':219 'page':157,188 'part':43 'path':109 'pay':2,19,54 'pay-per-cal':1,18 'pay-per-call NFT' 'pay-per-request':53 'payload':224 'payment':85,163,171 'per':3,20,55,142 'platform':47 'post':255 'premium':94 'price':119,152,197 'probe':90 'prompt':211 'proper':242 'rate':177 'relat':103 'request':56,143 'request/response':223 'requir':162 'respons':115,259 'return':206,235,240 'rout':204 'schema':116 'scheme':86 'serv':100 'settl':12,29,70 'site':148,174 'site-wid':147 'span':58 'spars':185 'spec':220 'specif':88 'straightforward':121 'structur':260 'suit':51 'though':110 'unit':132 'usdc':14,31,76,133 'usdc-settlement' 'use':75,134 'util':66 'via':10,27,167 'wallet':210 'wide':149 'without':246 'x':170 'x-payment':169 'x402':11,28,37,82,123 'x402 NFT' 'x402-enabled':36 'x402-payment'","prices":[{"id":"1d680d8d-2ed8-464b-adfb-db42f6460262","listingId":"1cf7bb36-e19a-4c33-b5dd-2103180ab17b","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.849Z"}],"sources":[{"listingId":"1cf7bb36-e19a-4c33-b5dd-2103180ab17b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.849Z","lastSeenAt":"2026-04-22T05:32:24.083Z"}],"details":{"listingId":"1cf7bb36-e19a-4c33-b5dd-2103180ab17b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/6 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/6"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/6"}],"useCases":["Fetching NFT metadata or details on a per-request payment basis","Integrating NFT data into agent workflows without managing API keys","Programmatic access to NFT information settled via on-chain USDC micropayments"],"bestFor":["Agents or bots that need keyless, pay-as-you-go NFT data access","Developers experimenting with x402 payment protocol integrations","Low-volume consumers who want no subscription commitments"],"notFor":["High-volume NFT data consumers who need bulk pricing or rate guarantees","Users who need detailed documentation or guaranteed SLAs before integrating","Anyone requiring non-USDC or non-Base-network payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.329Z"},"updatedAt":"2026-04-22T05:32:24.083Z"}}