{"id":"51aa6f4b-2387-4239-bc17-59812daba259","shortId":"jGkQCT","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys required.","description":"This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific resource `/api/v1/nfts/39` is labeled \"Premium API Access\" and is gated via the x402 protocol, settling payments in USDC on the Base network. Each call costs up to $0.02 (20,000 base units of USDC with 6 decimals). No API keys or accounts are needed — callers simply attach an x402 payment header.\n\nThe platform advertises a uniform $0.02-per-request pricing model with no rate limits, no minimums, and no commitments. Other endpoints on the same domain cover sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export. However, the specific functionality behind `/api/v1/nfts/39` is not documented beyond its title \"Premium API Access,\" so the exact response payload and purpose are unclear. The endpoint accepts POST requests and returns `application/json`.\n\nThe x402 challenge was successfully captured (HTTP 402), confirming the endpoint is live. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maximum timeout for payment settlement is 300 seconds.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","nft-data"],"categories":["web3","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","NFT API","lowpaymentfee","crypto-gated endpoint","402 payment required"],"warnings":["The specific functionality of /api/v1/nfts/39 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI spec, request schema, or response schema was found for this or any endpoint on the platform.","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content.","The NFT-related naming is inferred from the URL path; actual response content is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/39","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /api/v1/nfts/39 endpoint specifically — no request schema, no response schema, no examples, and the purpose beyond 'Premium API Access' is unknown. The broader site lists many endpoints but provides no detailed docs for any of 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'0.02':10,27,89,118 '000':91 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':206 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':209 '20':90 '300':219 '402':195 '402 payment required' '6':97 'Base network API' 'NFT API' 'USDC micropayment API' 'accept':182 'access':6,23,68,170 'account':103 'across':51 'address':205 'advertis':115 'ai/ml':54 'analysi':141 'analyt':53 'api':5,22,50,67,100,169 'application/json':187 'attach':108 'base':8,25,82,92,211 'base-network' 'behind':160 'beyond':165 'broader':43 'call':49,85 'caller':106 'captur':193 'challeng':190 'classif':144 'commit':132 'confirm':196 'convers':152 'cost':86 'cover':139 'crypto-gated endpoint' 'data':52,154 'decim':98 'document':164 'domain':138 'embed':145 'endpoint':36,134,181,198 'exact':173 'exchang':148 'export':155 'feed':147 'finance/web3':56 'function':159 'gate':3,20,71 'geocod':150 'header':112 'howev':156 'http':194 'infer':55 'infrastructur':58 'json-response' 'key':16,33,101 'label':65 'limit':127 'live':200 'lowpaymentfee' 'lowpaymentfee.com':38 'made':203 'maximum':213 'minimum':129 'model':123 'need':105 'network':83 'nft-data' 'no-api-key' 'offer':45 'part':40 'pay':9,26,47 'pay-per-cal':46 'pay-per-call API' 'pay-per-request' 'payload':175 'payment':77,111,201,216 'per':11,28,48,120 'per-request':119 'platform':44,114 'post':183 'premium':4,21,66,168 'price':122,146 'protocol':75 'purpos':177 'rate':126,149 'request':12,29,121,184 'requir':17,34 'resourc':62 'respons':174 'return':186 'second':220 'sentiment':140 'settl':76 'settlement':217 'simpli':107 'specif':61,158 'success':192 'summar':143 'text':142 'timeout':214 'titl':167 'unclear':179 'uniform':117 'unit':93 'usdc':14,31,79,95,208 'usdc-settlement' 'use':207 'util':59 'valid':151 'via':72 'x402':2,19,74,110,189 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"f10852a8-f4ab-4365-8b7c-104276e8e1ba","listingId":"51aa6f4b-2387-4239-bc17-59812daba259","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.791Z"}],"sources":[{"listingId":"51aa6f4b-2387-4239-bc17-59812daba259","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.791Z","lastSeenAt":"2026-04-22T04:02:47.323Z"}],"details":{"listingId":"51aa6f4b-2387-4239-bc17-59812daba259","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/39 \\\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":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/nfts/39"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units of USDC with 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/nfts/39"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/39"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing NFT-related data or premium content behind a per-call paywall","Integrating pay-per-use API calls into agent workflows without managing API keys","Programmatic micropayment-gated data retrieval on Base"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Projects needing low-cost per-request pricing with no subscription"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.358Z"},"updatedAt":"2026-04-22T04:02:47.323Z"}}