{"id":"47c597b0-6524-478f-96be-4c647f076ab2","shortId":"3MVN26","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled 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/customers/43` is listed as \"Premium API Access\" and returns `application/json` via POST. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The purpose of the `/api/v1/customers/43` endpoint specifically is unclear; it may be a demo or sample resource. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export, all at the same $0.02 price point.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","crypto-quotes","gas-estimates","geocoding","json-api"],"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","crypto api access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no useful content","The specific endpoint /api/v1/customers/43 is not listed on the landing page catalog — its purpose is unclear","No request body schema or response examples are documented anywhere","The breadth of advertised endpoints (AI, finance, data, utils) is unverifiable without documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/43","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of /api/v1/customers/43 is unexplained. Most doc pages render only 'Connect wallet' with no 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'/api/v1/customers/43':106,200 '/docs':165 '/pricing':166 '/readme':169 '/request':19,38 '0.02':18,37,70,138,239 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '0x8335':132 '20':125 '2913':133 '300':153 '402 payment api' '6':142 'access':112 'address':149 'advertis':121,216 'ai':12,31,57 'ai-inference' 'analysi':220 'analyt':56 'api':5,24,45,83,111 'application/json':115 'asset':131 'attach':94 'avail':195 'base':8,27,78,127,135 'base network api' 'beyond':157 'broad':50 'broader':214 'call':4,23 'caller':92 'catalog':51 'challeng':120 'classif':223 'classification' 'commit':91 'connect':175 'content':181 'convers':231 'cover':10,29 'crypto api access' 'crypto-quotes' 'data':11,30,55,233 'data-analytics' 'decim':143 'demo':209 'document':156,190 'embed':224 'embeddings' 'enabl':44 'endpoint':16,35,53,66,104,201,217 'equal':137 'everi':65 'exampl':194 'exchang':227 'exchange-rates' 'export':234 'extrem':162 'feed':226 'financ':13,32,60 'finance-data' 'gas-estimates' 'geocod':229 'geocoding' 'given':139 'header':98 'infrastructur':63 'json-api' 'key':84 'land':159 'learn':59 'limit':87 'list':108 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'maxamountrequir':123 'may':206 'micropayment api' 'minimum':90 'network':79 'offer':48 'openapi':185 'page':160,170 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':97,145 'per':3,22,71 'platform':6,25,46,215 'point':241 'post':117 'premium':110 'price':68,225,240 'prompt':177 'purpos':197 'rate':86,228 'render':172 'request':72,101 'request/response':188 'resourc':212 'return':114 'sampl':211 'schema':189 'second':154 'sent':147 'sentiment':219 'sentiment-analysis' 'settl':73 'simpli':93 'span':54 'spars':163 'spec':186 'specif':103,202 'summar':222 'text':221 'text-summarization' 'timeout':155 'unclear':204 'unit':128 'usag':193 'usdc':9,28,75,130,140 'usdc api' 'usdc-base' 'util':15,34,64 'valid':230 'via':116 'wallet':176 'web3':61 'x402':43,96,119 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a242de12-dd46-45ee-86ed-e383a58c6015","listingId":"47c597b0-6524-478f-96be-4c647f076ab2","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:10.989Z"}],"sources":[{"listingId":"47c597b0-6524-478f-96be-4c647f076ab2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:10.989Z","lastSeenAt":"2026-04-22T20:00:43.083Z"}],"details":{"listingId":"47c597b0-6524-478f-96be-4c647f076ab2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/43 \\\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 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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/customers/43"},{"claim":"Platform advertises endpoints for analytics, AI (sentiment, summarization, classification, embeddings), finance, and utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages /docs, /pricing, /api, /README render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"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 on a per-call basis","Running data analytics queries and exporting data with instant pay-per-use pricing","Using utility services like geocoding, validation, and conversion via x402 micropayments"],"bestFor":["Agents and bots that need keyless, pay-per-call API access","Developers prototyping with multiple API categories without subscription commitments","Web3-native applications already holding USDC on Base"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where per-request pricing may add up compared to bulk plans","Users without USDC on Base or unfamiliar with x402 payment protocol"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.745Z"},"updatedAt":"2026-04-22T20:00:43.083Z"}}