{"id":"27bd112b-1852-4244-b42c-b3c07969d33a","shortId":"Ghch83","kind":"x402","title":"x402 pay-per-call API platform on Base with $0.02 USDC requests across data, AI, finance, and utility endpoints.","tagline":"x402 pay-per-call API platform on Base with $0.02 USDC requests across data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-call endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/nfts/40` is listed as \"Premium API Access\" and costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact-payment scheme — no API keys, accounts, or rate limits are required. Callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader platform advertises endpoints spanning four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing.\n\nThe specific functionality behind `/api/v1/nfts/40` is not documented — the path suggests NFT-related data (possibly metadata or details for NFT ID 40), but no schema, example request, or example response is available. The endpoint accepts POST requests and returns `application/json`. Payments are sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base, with a maximum timeout of 300 seconds.","tags":[],"capabilities":["x402-payment","pay-per-call","usdc-settlement","base-network","nft-data","json-api","no-api-key","no-rate-limit"],"categories":["web3","data"],"synonyms":["NFT API","NFT metadata","pay-per-request API","x402 API","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No documentation exists for the /api/v1/nfts/40 endpoint — its purpose and response format are unknown","The endpoint path is not listed among the advertised APIs on the homepage, raising questions about its status","No OpenAPI spec, request schema, or response schema is available","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/40","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for what /api/v1/nfts/40 actually returns, no request/response schema, no examples, and the crawled pages beyond the homepage are empty wallet-connect stubs. The specific NFT endpoint isn't even listed on the homepage 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'/request':172 '0.02':11,31,80,171 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':219 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':222 '20':83 '300':230 '40':196 '6':90 'Base network API' 'NFT API' 'NFT metadata' 'USDC micropayment API' 'accept':209 'access':77 'account':105 'across':14,34 'advertis':127 'ai':16,36,139 'analysi':143 'analyt':133 'api':6,26,47,76,103 'application/json':214 'attach':113 'avail':206 'base':9,29,65,85,224 'base-network' 'behind':177 'broad':52 'broader':125 'call':5,25,58 'caller':111 'catalog':53 'categori':131 'classif':146 'convers':163 'cost':79 'data':15,35,132,136,188 'decim':91 'detail':192 'document':181 'embed':147 'enabl':46 'endpoint':20,40,59,69,128,167,208 'estim':157 'exact':99 'exact-pay':98 'exampl':200,203 'exchang':152 'export':137 'feed':151 'financ':17,37,148 'four':130 'function':176 'gas':156 'generat':164 'geocod':161 'handl':94 'header':118 'id':195 'infrastructur':159 'insight':138 'json-api' 'key':104 'learn':141 'limit':108 'list':73,166 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':140 'maximum':227 'metadata':190 'metric':134 'network':66 'nft':186,194 'nft-data' 'nft-relat':185 'no-api-key' 'no-rate-limit' 'offer':50 'path':183 'pay':3,23,56 'pay-per-cal':2,22,55 'pay-per-call' 'pay-per-request API' 'payment':92,100,117,122,215 'per':4,24,57,81 'platform':7,27,48,126 'possibl':189 'post':210 'premium':75 'price':150,173 'proof':123 'quot':155 'rate':107,153 'relat':187 'report':135 'request':13,33,82,201,211 'requir':110 'respons':204 'return':213 'schema':199 'scheme':101 'second':231 'sent':217 'sentiment':142 'settl':60 'share':168 'simpli':112 'span':129 'specif':68,175 'suggest':184 'summar':145 'text':144 'timeout':228 'token':154 'unit':86 'usdc':12,32,62,88,221 'usdc-settlement' 'use':220 'util':19,39,160 'valid':121,162 'via':95 'web3':149 'x':116 'x-payment':115 'x402':1,21,45,97 'x402 API' 'x402-enabled':44 'x402-payment'","prices":[{"id":"42ed02b1-031f-43ef-ad96-90ecfd588500","listingId":"27bd112b-1852-4244-b42c-b3c07969d33a","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.115Z"}],"sources":[{"listingId":"27bd112b-1852-4244-b42c-b3c07969d33a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.115Z","lastSeenAt":"2026-04-22T02:32:09.377Z"}],"details":{"listingId":"27bd112b-1852-4244-b42c-b3c07969d33a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/40 \\\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 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/nfts/40"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/40"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT-related data without needing an API key or account","Programmatic access to NFT information with per-call USDC micropayments","Agent-driven workflows that need on-demand NFT data with crypto settlement"],"bestFor":["Developers or agents wanting keyless, pay-as-you-go NFT data access","Crypto-native applications already operating on Base with USDC","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["High-volume consumers needing bulk NFT data at lower per-call cost","Users without USDC on Base or unfamiliar with x402 payment flows","Anyone needing detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.31Z"},"updatedAt":"2026-04-22T02:32:09.377Z"}}