{"id":"f7e5d348-d2a9-43d3-b162-4191b1579bb8","shortId":"XFzgeL","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/customers/31` is labeled \"Premium API Access\" and returns JSON via POST.\n\nThe platform advertises four endpoint families: 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 are priced uniformly at $0.02 per call.\n\nThe x402 challenge for this particular endpoint specifies a maxAmountRequired of 20000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. Payment is settled on-chain to the provider's wallet. No OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl — the docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The docs, pricing, and README pages render only a 'Connect wallet' prompt with no usable content","The specific endpoint /api/v1/customers/31 is not listed on the homepage catalog — its purpose is undocumented","No example request or response bodies are available; integration requires trial and error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/31","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/customers/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no example request/response payloads, and the docs/pricing/README pages are empty beyond a wallet-connect prompt. The specific purpose of `/api/v1/customers/31` (labeled 'Premium API Access') is unclear and not 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'/request':13,28 '0.02':12,27,59,139,165 '0x8335':158 '20000':153 '402 payment api' '6':161 'access':89 'addit':206 'advertis':97 'ai':108 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':112 'analyt':48,102 'api':5,20,37,71,88 'base':8,23,67,154,160 'base network api' 'broad':42 'call':4,19,141 'catalog':43 'chain':171 'challeng':144 'classif':115 'commit':79 'connect':201 'content':207 'convers':132 'conversion' 'cost':58 'crawl':190 'crypto-gas' 'data':47,52,101,105 'data-analytics' 'decim':162 'detail':180 'doc':192 'document':181 'embed':116 'enabl':36 'endpoint':45,57,82,99,148 'equal':164 'estim':126 'everi':56 'exampl':183 'exchang':121 'exchange-rates' 'export':106 'famili':100 'feed':120 'financ':117 'finance-prices' 'finance/web3':51 'found':187 'four':98 'gas':125 'generat':133 'geocod':130 'geocoding' 'infer':50 'infrastructur':128 'insight':107 'json':92 'key':72 'label':86 'learn':110 'limit':75 'low payment fee' 'lowpaymentfee.com':31 'machin':109 'maxamountrequir':151 'metric':103 'micropayment api' 'network':9,24,68 'offer':40 'on-chain':169 'openapi':178 'page':196 'paid':62 'particular':147 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payload':185 'payment':166 'per':3,18,60,140 'platform':6,21,38,96 'post':94 'premium':87 'price':119,136,193 'prompt':203 'provid':174 'quot':124 'rate':74,122 'readm':195 'render':198 'report':104 'request':61 'request/response':184 'return':91 'schema':179 'sentiment':111 'servic':55 'settl':168 'span':46 'specif':81 'specifi':149 'summar':114 'text':113 'token':123 'uniform':137 'unit':155 'upfront':78 'usdc':15,30,64,157 'usdc api' 'usdc-base' 'util':54,129 'valid':131 'validation' 'via':10,25,93 'wallet':176,202 'web3':118 'x402':11,26,35,143 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"0d86ca4e-83e8-4e8a-8eba-c3e200ddfe2b","listingId":"f7e5d348-d2a9-43d3-b162-4191b1579bb8","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/customers/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:23.366Z"}],"sources":[{"listingId":"f7e5d348-d2a9-43d3-b162-4191b1579bb8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:23.366Z","lastSeenAt":"2026-04-22T23:00:57.981Z"}],"details":{"listingId":"f7e5d348-d2a9-43d3-b162-4191b1579bb8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/31 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 endpoint families","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/31"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-use analytics and data export into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Use cases requiring small, infrequent API calls where subscription pricing is wasteful","Crypto-native workflows that can settle USDC on Base"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.991Z"},"updatedAt":"2026-04-22T23:00:57.981Z"}}