{"id":"82b68067-6520-4b56-a1ae-4d3ba15fb15d","shortId":"yDLSzd","kind":"x402","title":"x402 pay-per-call API platform on Base with $0.02 USDC requests — no keys, no rate limits.","tagline":"x402 pay-per-call API platform on Base with $0.02 USDC requests — no keys, no rate limits.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad suite of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every request is paid per-call at $0.02 USDC on the Base network, with no API keys, no rate limits, and no subscription commitments. Payment is handled via the x402 protocol: callers attach an X-PAYMENT header with a signed USDC payment to the payTo address, and the endpoint returns the result.\n\nThe specific endpoint `/api/v1/nfts/3` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests. No detailed input/output schema beyond the x402 challenge envelope is published, so the exact request body format and response structure for this NFT-related endpoint are unknown.\n\nThe broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). All share the same $0.02/request pricing model. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional content.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","nft-data","json-api","no-api-key","no-rate-limit","pay-per-use"],"categories":["web3","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","nft api","micropayment api","402 payment api"],"warnings":["No API documentation available — /api, /pricing, and /README all return only a wallet-connect prompt with no content.","No input or output schema published for /api/v1/nfts/3; request body format is unknown.","The endpoint path suggests NFT data but the listing title is generic ('Premium API Access') with no further detail.","Platform appears to be a demonstration or early-stage project; reliability and data quality are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/3","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/3","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no published OpenAPI schema, no request/response examples, and no documentation beyond a landing page. The specific purpose of /api/v1/nfts/3 is undocumented. This is effectively a stub 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'/api/v1/nfts/3':119 '/pricing':244 '/readme':246 '/request':232 '0.02':11,29,70,148,231 '000':137 '0x8335':142 '20':136 '2913':143 '402 payment api' '6':152 'accept':156 'access':125 'addit':258 'address':109 'advertis':132,190 'ai':202 'ai/ml':55 'analysi':206 'analyt':54,196 'api':6,24,43,78,124 'application/json':128 'attach':95 'base':9,27,74,138,145 'base network api' 'beyond':163,236 'bodi':174 'broad':48 'broader':188 'call':5,23,68 'caller':94 'categori':194 'challeng':131,166 'classif':209 'commit':86 'connect':254 'content':259 'convers':225 'data':53,58,195,199 'decim':153 'detail':160 'document':235 'embed':210 'enabl':42 'endpoint':51,112,118,155,184,191 'envelop':167 'equal':147 'estim':220 'everi':62 'exact':172 'exchang':215 'export':200 'feed':214 'financ':211 'finance/web3':57 'format':175 'four':193 'gas':219 'generat':226 'geocod':223 'given':149 'handl':89 'header':100 'infer':56 'infrastructur':60,222 'input/output':161 'insight':201 'json-api' 'key':15,33,79 'land':238 'learn':204 'limit':18,36,82 'list':121 'low payment fee' 'lowpaymentfee.com':37 'machin':203 'maxamountrequir':134 'metric':197 'micropayment api' 'model':234 'network':75 'nft':182 'nft api' 'nft-data' 'nft-relat':181 'no-api-key' 'no-rate-limit' 'offer':46 'page':239,247 'paid':65 'pay':3,21 'pay per call api' 'pay-per-cal':2,20 'pay-per-use' 'payment':87,99,105 'payto':108 'per':4,22,67 'per-cal':66 'per-call-pricing' 'platform':7,25,44,189 'post':157 'premium':123 'price':213,233 'prompt':255 'protocol':93 'publish':169 'quot':218 'rate':17,35,81,216 'relat':183 'report':198 'request':13,31,63,158,173 'resolv':249 'respons':177 'result':115 'return':113,127 'schema':162 'sentiment':205 'share':228 'sign':103 'span':52 'spars':241 'specif':117 'structur':178 'subscript':85 'suit':49 'summar':208 'text':207 'token':217 'unit':139 'unknown':186 'usdc':12,30,71,104,141,150 'usdc api' 'usdc-base' 'util':61 'valid':224 'via':90 'wallet':253 'wallet-connect':252 'web3':212 'x':98 'x-payment':97 'x402':1,19,41,92,130,165 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"06df0065-ba3d-47ce-8b51-274d4f9c401a","listingId":"82b68067-6520-4b56-a1ae-4d3ba15fb15d","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.062Z"}],"sources":[{"listingId":"82b68067-6520-4b56-a1ae-4d3ba15fb15d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.062Z","lastSeenAt":"2026-04-22T02:32:09.317Z"}],"details":{"listingId":"82b68067-6520-4b56-a1ae-4d3ba15fb15d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/3 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/nfts/3 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/nfts/3"},{"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 on a per-call basis without managing API keys","Agent-driven workflows that need on-demand paid API access settled in USDC on Base","Prototyping integrations against a low-cost, no-commitment API platform"],"bestFor":["Developers or agents wanting zero-setup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime documentation","Users who need detailed API documentation, schemas, or SDKs before integrating","Non-crypto users who cannot send USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.322Z"},"updatedAt":"2026-04-22T02:32:09.317Z"}}