{"id":"f2329b54-2022-41da-9b4c-2423b2a6d94e","shortId":"9HBLWu","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 set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $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 probed here (`/api/v1/accounts/100`) is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base.\n\nThe platform advertises four categories of APIs: 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 (geocoding, validation, conversion, generation). All endpoints follow the x402 payment protocol — callers receive a 402 challenge with payment details and settle via an `X-PAYMENT` header.\n\nDocumentation is extremely sparse. 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 detailed endpoint documentation available from the crawl. The actual behavior and response format of each endpoint is unknown beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no api key","serverless api"],"warnings":["Documentation pages (docs, API, pricing, README) are empty — only show 'Connect wallet'","No OpenAPI or schema available; request/response formats are unknown","The specific endpoint /api/v1/accounts/100 ('Premium API Access') has no description of what data it returns","Cannot verify actual functionality of any endpoint without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/100","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/accounts/100","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 ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. No OpenAPI schema, no request/response examples, and no details on what the /accounts/100 endpoint actually returns after 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'/request':13,28 '0.02':12,27,61,108 '000':102 '20':101 '402':96,160 'access':92 'actual':213 'advertis':113 'ai':125 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':129 'analyt':48,119 'api':5,20,37,73,91,117,179 'avail':208 'base':8,23,69,103,110 'base network api' 'behavior':214 'beyond':223 'broad':42 'call':4,19 'caller':157 'categori':115 'challeng':97,161,226 'classif':132 'commit':81 'connect':188 'content':194 'convers':148 'conversion' 'crawl':211 'crypto-gas-estimates' 'data':47,52,118,122 'data-analytics' 'detail':164,205 'doc':178 'document':173,207 'embed':133 'enabl':36 'endpoint':45,57,84,151,206,220 'estim':143 'everi':56 'exampl':202 'exchang':138 'exchange-rates' 'export':123 'extrem':175 'feed':137 'financ':134 'finance-price-feeds' 'finance/web3':51 'follow':152 'format':217 'four':114 'gas':142 'generat':149 'geocod':146 'geocoding' 'header':172 'i.e':107 'infer':50 'infrastructur':54,145 'insight':124 'key':74 'label':89 'learn':127 'limit':77 'low payment fee' 'lowpaymentfee.com':31 'machin':126 'metadata':227 'metric':120 'micropayment api' 'network':9,24,70 'no api key' 'offer':40 'openapi':198 'page':183 'paid':64 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':155,163,171 'per':3,18,62 'platform':6,21,38,112 'premium':90 'price':59,136,180 'probe':85 'prompt':190 'protocol':156 'quot':141 'rate':76,139 'readm':182 'receiv':158 'render':185 'report':121 'request':63,98 'request/response':201 'respons':216 'return':94 'schema':199 'sentiment':128 'serverless api' 'set':43 'settl':166 'span':46 'spars':176 'specif':83 'summar':131 'text':130 'token':140 'unit':104 'unknown':222 'upfront':80 'usdc':15,30,66,106 'usdc api' 'usdc-base-network' 'util':55 'valid':147 'validation' 'via':10,25,167 'wallet':189 'web3':135 'x':170 'x-payment':169 'x402':11,26,35,154,225 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"af2ab2bc-e880-4412-8b55-d2d1f0e3b427","listingId":"f2329b54-2022-41da-9b4c-2423b2a6d94e","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/accounts/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:13.565Z"}],"sources":[{"listingId":"f2329b54-2022-41da-9b4c-2423b2a6d94e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:13.565Z","lastSeenAt":"2026-04-22T20:00:46.019Z"}],"details":{"listingId":"f2329b54-2022-41da-9b4c-2423b2a6d94e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/100\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment on Base to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/accounts/100","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"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","source_url":"https://lowpaymentfee.com"},{"claim":"Payment in USDC on Base network via x402 protocol","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units (USDC, 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/accounts/100"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments","Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) without subscription","Accessing utility services (geocoding, validation, conversion) on a pay-as-you-go basis","Integrating x402-compatible agent workflows that settle payments automatically on Base"],"bestFor":["Agents or developers wanting zero-commitment, per-request API access","x402-native workflows that need low-cost micropayments on Base","Prototyping across multiple API categories without managing API keys"],"notFor":["Production workloads requiring detailed documentation, SLAs, or guaranteed uptime","Use cases needing high-throughput bulk access with volume discounts","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.518Z"},"updatedAt":"2026-04-22T20:00:46.019Z"}}