{"id":"afab5b12-3518-4817-befa-9fc4bdf6d9a3","shortId":"ZgGAfa","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transactions/73` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises four main categories of APIs: 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 endpoints appear to follow the same x402 payment flow — callers receive a 402 challenge with payment details, settle in USDC on Base, and then receive the API response.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/transactions/73` endpoint specifically returns. The x402 challenge confirms the endpoint is live and accepts USDC payments of up to 20,000 base units ($0.02) on Base.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or JSON schema available for any endpoint","The specific purpose of /api/v1/transactions/73 ('Premium API Access') is undocumented — unclear what data it returns","No request body schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/73","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/transactions/73","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 confirms pricing and payment details, but documentation is essentially nonexistent — all doc/API/pricing pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the /api/v1/transactions/73 endpoint actually returns. The listing is largely a 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'/request':13,28 '0.02':12,27,59,226 '000':223 '20':222 '402':150 '402 payment api' 'accept':216 'access':90 'advertis':98 'ai':111 'ai-inference' 'ai/ml':49 'analysi':115 'analyt':48,105 'api':5,20,37,71,89,103,164,172 'appear':139 'application/json':93 'base':8,23,67,159,224,228 'base network api' 'broad':42 'call':4,19 'caller':147 'catalog':43 'categori':101 'challeng':151,209 'classif':118 'commit':79 'confirm':210 'connect':181 'content':187 'convers':135 'cost':58 'data':47,52,104,108 'data-analytics' 'descript':199 'detail':154,198 'doc':171 'document':166 'embed':119 'enabl':36 'endpoint':45,57,82,138,204,212 'estim':129 'everi':56 'exampl':195 'exchang':124 'export':109 'extrem':168 'feed':123 'financ':120 'finance-data' 'finance/web3':51 'flow':146 'follow':141 'four':99 'gas':128 'generat':136 'geocod':133 'infer':50 'infrastructur':131 'insight':110 'json-api' 'key':72 'learn':113 'limit':75 'list':86 'live':214 'low payment fee' 'lowpaymentfee.com':31 'machin':112 'main':100 'metric':106 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':191 'page':176 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':145,153,218 'per':3,18,60 'platform':6,21,38,97 'post':95 'premium':88 'price':122,173 'prompt':183 'quot':127 'rate':74,125 'readm':175 'receiv':148,162 'render':178 'report':107 'request':61 'request/response':194 'respons':165 'return':92,206 'schema':192 'sentiment':114 'servic':55 'settl':155 'span':46 'spars':169 'specif':81,205 'summar':117 'text':116 'token':126 'unit':225 'upfront':78 'usdc':15,30,64,157,217 'usdc api' 'usdc-base-network' 'util':54,132 'utility-services' 'valid':134 'via':10,25,94 'wallet':182 'web3':121 'web3-data' 'x402':11,26,35,144,208 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"1d5901f9-6371-4fd7-aa67-424eb24107cf","listingId":"afab5b12-3518-4817-befa-9fc4bdf6d9a3","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/transactions/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:10.633Z"}],"sources":[{"listingId":"afab5b12-3518-4817-befa-9fc4bdf6d9a3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:10.633Z","lastSeenAt":"2026-04-22T16:32:15.320Z"}],"details":{"listingId":"afab5b12-3518-4817-befa-9fc4bdf6d9a3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/73\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All 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 Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transactions/73 specifies maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/73"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing analytics metrics and reports on a per-call basis without subscription","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-request USDC payment","Fetching real-time crypto prices, gas estimates, and exchange rates","Geocoding, data validation, and format conversion utilities"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micro-transactions for API calls"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that benefit from bulk pricing or rate-limit guarantees","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.797Z"},"updatedAt":"2026-04-22T16:32:15.320Z"}}