{"id":"3d9852b6-fea0-4a40-89d2-d04007c60808","shortId":"6GAh2T","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/products/97` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the payTo address, with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The exact functionality behind the `/api/v1/products/97` \"Premium API Access\" endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 API","USDC API","Base network API","micropayment API","pay-per-call API","crypto API payments"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content","The specific functionality of /api/v1/products/97 'Premium API Access' is not described anywhere in the crawled material","No request body schema or response examples could be found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/97","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/products/97","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 pricing and payment details. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty beyond a wallet-connect prompt. The purpose of '/api/v1/products/97' specifically is unknown beyond its title 'Premium API Access'. This is effectively a stub 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'/call':13,28 '0.02':12,27,61,117,169 '000':106 '0x8335':111 '20':105 '2913':112 '300':137 '6':121 'Base network API' 'USDC API' 'accept':92 'access':90,222 'across':45 'address':134 'advertis':143 'ai':48 'analysi':147 'analyt':47 'api':5,20,37,73,89,179,221 'avail':209 'base':8,23,69,107,114 'behind':217 'broader':141 'categori':55 'challeng':97 'classif':150 'commit':78 'confirm':98 'connect':188 'content':213 'convers':162 'crawl':212 'crypto API payments' 'data':46 'decim':122 'detail':195 'doc':178 'document':173,204 'embed':151 'enabl':36 'endpoint':44,57,82,144,223 'equal':116 'estim':159 'exact':129,215 'exampl':208 'exchang':154 'extrem':175 'feed':153 'financ':51 'function':216 'gas':158 'generat':164 'geocod':160 'given':118 'howev':172 'infrastructure/utility':54 'json-response' 'key':74 'learn':50 'limit':76 'list':86 'live':101 'low payment fee' 'lowpaymentfee.com':31 'machin':49 'made':125 'marketplac':38 'micropayment API' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':199 'page':183 'paid':64 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payment':123 'payto':133 'per':3,18,62 'platform':6,21,142 'point':171 'post':93 'post-endpoint' 'premium':88,220 'price':59,152,170,180 'prompt':190 'quot':157 'rate':75,155 'readm':182 'render':185 'request':4,19,63,94,102 'request/response':202 'requir':79 'schema':203 'scheme':130 'second':138 'sentiment':146 'spars':176 'spec':200 'specif':81 'summar':149 'technic':194 'text':148 'timeout':139 'token':156 'unclear':225 'unit':108 'usag':207 'usdc':15,30,66,110,119 'usdc-base-network' 'valid':161 'varieti':42 'via':10,25,126 'wallet':189 'web3':52 'x402':11,26,35,96,128 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"afa742ee-1f3b-41e9-9dac-3f94aabe360e","listingId":"3d9852b6-fea0-4a40-89d2-d04007c60808","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/products/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:54.353Z"}],"sources":[{"listingId":"3d9852b6-fea0-4a40-89d2-d04007c60808","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:54.353Z","lastSeenAt":"2026-04-23T18:03:21.521Z"}],"details":{"listingId":"3d9852b6-fea0-4a40-89d2-d04007c60808","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/97 \\\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 priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Payment in USDC on Base network via x402 exact scheme","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/97"},{"claim":"Endpoint accepts POST method and returns application/json","source_url":"https://lowpaymentfee.com/api/v1/products/97"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing various API services (analytics, AI, finance, utilities) with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API key management","Programmatic access to data and utility endpoints settled on Base L2"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.374Z"},"updatedAt":"2026-04-23T18:03:21.521Z"}}