{"id":"03dcd5f7-4a9e-4268-a19b-2b989d6377d8","shortId":"8kDzHE","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 collection 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/127` 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 use the x402 payment protocol, settling in USDC (contract `0x8335...2913`) on Base.\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 documentation for any endpoint. The x402 challenge for this specific endpoint is live and well-formed, confirming the payment flow works, but the actual functionality behind `/api/v1/transactions/127` is unclear beyond its \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","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, pricing, README, api) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available for any endpoint","The specific endpoint /api/v1/transactions/127 has no description beyond 'Premium API Access' — its actual functionality is unknown","No request or response examples are available anywhere in the crawled material","The endpoint path '/api/v1/transactions/127' does not appear in the site's own listed API catalog, raising questions about what it actually does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/127","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/127","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 well-formed, confirming the endpoint exists and accepts USDC payments on Base. However, documentation is essentially nonexistent — all doc/pricing/README pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the actual functionality of /api/v1/transactions/127 is unclear. The listing is effectively a stub with a working payment 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'/request':13,28 '0.02':12,27,59 '0x8335':148 '2913':149 '402 payment api' 'access':90,219 'actual':209 'advertis':98 'ai':111 'ai-inference' 'ai/ml':49 'analysi':115 'analyt':48,105 'api':5,20,37,71,89,103,158,218 'application/json':93 'base':8,23,67,151 'base network api' 'behind':211 'beyond':215 'broad':42 'call':4,19 'categori':101 'challeng':191 'classif':118 'collect':43 'commit':79 'confirm':202 'connect':167 'content':173 'contract':147 'convers':135 'cost':58 'data':47,52,104,108 'data-analytics' 'detail':184 'doc':157 'document':152,185 'embed':119 'enabl':36 'endpoint':45,57,82,138,188,195 'estim':129 'everi':56 'exampl':181 'exchang':124 'export':109 'extrem':154 'feed':123 'financ':120 'finance-data' 'finance/web3':51 'flow':205 'form':201 'four':99 'function':210 'gas':128 'generat':136 'geocod':133 'infer':50 'infrastructur':131 'insight':110 'json-api' 'key':72 'label':220 'learn':113 'limit':75 'list':86 'live':197 'low payment fee' 'lowpaymentfee.com':31 'machin':112 'main':100 'metric':106 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':177 'page':162 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':142,204 'per':3,18,60 'platform':6,21,38,97 'post':95 'post-method' 'premium':88,217 'price':122,159 'prompt':169 'protocol':143 'quot':127 'rate':74,125 'readm':161 'render':164 'report':107 'request':61 'request/response':180 'return':92 'schema':178 'sentiment':114 'servic':55 'settl':144 'span':46 'spars':155 'specif':81,194 'summar':117 'text':116 'token':126 'unclear':214 'upfront':78 'usdc':15,30,64,146 'usdc api' 'usdc-base' 'use':139 'util':54,132 'utility-services' 'valid':134 'via':10,25,94 'wallet':168 'web3':121 'web3-data' 'well':200 'well-form':199 'work':206 'x402':11,26,35,141,190 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"0a6cab74-3a4d-46d8-be71-56bcd1732b84","listingId":"03dcd5f7-4a9e-4268-a19b-2b989d6377d8","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/127","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:33.971Z"}],"sources":[{"listingId":"03dcd5f7-4a9e-4268-a19b-2b989d6377d8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/127","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:33.971Z","lastSeenAt":"2026-04-22T23:02:08.416Z"}],"details":{"listingId":"03dcd5f7-4a9e-4268-a19b-2b989d6377d8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/127 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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":"x402 challenge is live with maxAmountRequired of 20000 base units USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/transactions/127"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing analytics metrics or 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, or exchange rates","Geocoding, data validation, or format conversion via utility endpoints","Integrating pay-as-you-go APIs into autonomous agent workflows"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Projects needing lightweight access to multiple API categories without managing API keys"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.755Z"},"updatedAt":"2026-04-22T23:02:08.416Z"}}