{"id":"4a98ada8-4ef3-4fb5-a941-b47ef8e83c6f","shortId":"Mb7npS","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/34` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across 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 endpoints are listed at the same $0.02/request price point.\n\nHowever, documentation is extremely thin. 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 description of what the `/api/v1/payments/34` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The purpose of '/api/v1/payments/34' ('Premium API Access') is not explained anywhere","Cannot verify what data or functionality this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/34","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/payments/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. It is unclear what 'Premium API Access' actually returns, making this effectively a stub 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'/request':13,28,152 '0.02':12,27,74,151 '000':68 '20':67 '402':204 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,88,219 'across':108 'actual':194 'advertis':79 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,81,162,218 'attach':91 'base':8,23,51,69 'broader':104 'call':4,19,76 'caller':89 'categori':110 'challeng':206 'charg':64 'classif':125 'confirm':199 'connect':171 'content':177 'convers':142 'crypto-paid API' 'data':111,115,214 'descript':188 'doc':161 'document':156,209 'embed':126 'endpoint':55,107,145,193,197 'estim':136 'exampl':185 'exchang':131 'export':116 'extrem':158 'feed':130 'financ':127 'four':109 'function':216 'gas':135 'generat':143 'geocod':140 'header':96 'howev':155 'http-post' 'i.e':73 'infrastructur':138 'insight':117 'instant':87 'key':82 'label':59 'learn':120 'limit':85 'list':147 'live':200 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'openapi':181 'page':166 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,95,101 'per':3,18,36,75 'platform':6,21,39,78,105 'point':154 'premium':60,217 'price':129,153,163 'prompt':173 'proof':102 'proper':203 'protocol':44 'provid':220 'quot':134 'rate':84,132 'readm':165 'render':168 'report':114 'request':37 'request/response':184 'return':195,201 'schema':182 'sentiment':121 'simpli':90 'specif':54 'summar':124 'text':123 'thin':159 'token':133 'unclear':212 'unit':70 'usdc':15,30,47,72 'usdc-base-network' 'use':41 'util':139 'valid':99,141 'via':10,25 'wallet':172 'web3':128 'without':208 'x':94 'x-payment':93 'x402':11,26,43,100,205 'x402 API' 'x402-payment'","prices":[{"id":"bacbe1d4-d809-4c0d-bfc6-7940f6edded0","listingId":"4a98ada8-4ef3-4fb5-a941-b47ef8e83c6f","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/payments/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:22.921Z"}],"sources":[{"listingId":"4a98ada8-4ef3-4fb5-a941-b47ef8e83c6f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:22.921Z","lastSeenAt":"2026-04-24T00:32:11.749Z"}],"details":{"listingId":"4a98ada8-4ef3-4fb5-a941-b47ef8e83c6f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/34 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/34"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","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"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/34"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off API calls paid in USDC on Base","Agent-driven API consumption with per-request crypto payments"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone requiring free-tier or fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.266Z"},"updatedAt":"2026-04-24T00:32:11.749Z"}}