{"id":"7cba5a41-795e-4e11-857f-8f617f0abf62","shortId":"TuHRNH","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. All endpoints are pay-per-request using the x402 protocol, settling in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/products/2` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, using USDC at contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`.\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 data generation — all at the same $0.02 per request 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.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content","The specific purpose and expected input/output of /api/v1/products/2 is undocumented","No request or response examples could be sourced"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/2","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/2","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 there is essentially no documentation: no OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The purpose of this specific '/products/2' endpoint is unclear beyond the generic label 'Premium API Access'. This is effectively a stub 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'/request':13,28 '0.02':12,27,119,180 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':142 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':149 '20':112 '402 payment api' 'accept':130 'access':106 'address':141 'advertis':153 'ai/ml':49 'analysi':157 'analyt':48 'api':5,20,37,77,105,192 'application/json':135 'attach':88 'avail':222 'base':8,23,72,114,144 'base network api' 'base-network' 'broad':42 'broader':151 'call':4,19,121 'caller':86 'catalog':43 'challeng':124 'classif':160 'commit':85 'confirm':125 'connect':201 'content':226 'contract':148 'convers':172 'crawl':225 'data':47,52,174 'detail':208 'doc':191 'document':186,217 'embed':161 'enabl':36 'endpoint':45,57,98,127,154 'estim':169 'exampl':221 'exchang':164 'extrem':188 'feed':163 'finance/web3':51 'gas':168 'generat':175 'geocod':170 'header':92 'howev':185 'i.e':118 'infer':50 'json-response' 'key':78 'limit':81 'list':102 'live':129 'low payment fee' 'lowpaymentfee.com':31 'maximum':110 'micropayment api' 'minimum':84 'network':9,24,73 'no-api-key' 'offer':40 'openapi':212 'page':196 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payment':91,137 'per':3,18,61,120,181 'platform':6,21,38,152 'point':184 'post':131 'post-method' 'premium':104 'price':162,183,193 'prompt':203 'protocol':66 'quot':167 'rate':80,165 'readm':195 'render':198 'request':62,95,132,182 'request/response':215 'requir':108 'return':134 'schema':216 'sent':139 'sentiment':156 'servic':55 'settl':67 'simpli':87 'span':46 'spars':189 'spec':213 'specif':97 'summar':159 'technic':207 'text':158 'token':166 'unit':115 'usag':220 'usdc':15,30,69,117,146 'usdc api' 'usdc-settlement' 'use':63,145 'util':54 'valid':171 'via':10,25 'wallet':202 'x402':11,26,35,65,90,123 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2d895611-9404-4bd2-a750-df82f166e8ee","listingId":"7cba5a41-795e-4e11-857f-8f617f0abf62","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:14.285Z"}],"sources":[{"listingId":"7cba5a41-795e-4e11-857f-8f617f0abf62","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:14.285Z","lastSeenAt":"2026-04-23T16:30:39.040Z"}],"details":{"listingId":"7cba5a41-795e-4e11-857f-8f617f0abf62","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/2 \\\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 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/2"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/2"},{"claim":"Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need low-friction, per-request payment"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can handle x402 payment flows autonomously","Users already holding USDC on Base who want instant API access"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.443Z"},"updatedAt":"2026-04-23T16:30:39.040Z"}}