{"id":"7dcfeb6b-6e19-42bd-9e89-3ab470351f11","shortId":"WeuDHj","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. Each call costs $0.02 in USDC on the Base network, settled via the x402 payment protocol. No API keys, accounts, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint at `/api/v1/payments/169` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The broader platform lists 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.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content visible to crawlers. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body this specific endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","no-auth api","402 payment api"],"warnings":["Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no usable content for crawlers.","No OpenAPI or schema documentation is available for any endpoint.","The specific function of /api/v1/payments/169 ('Premium API Access') is not documented — it is unclear what it does or what request body it expects.","The platform lists many endpoint categories but without docs it is impossible to verify they are functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/169","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/payments/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — docs/pricing/API pages all show only 'Connect wallet'. No OpenAPI spec, no request/response schemas, and no examples are available. The specific purpose of /api/v1/payments/169 ('Premium API Access') is unclear beyond its generic 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'/request':12,28 '0.02':11,27,65,135,171 '000':124 '0x8335':129 '20':123 '2913':130 '402':223 '402 payment api' '6':139 'accept':113 'access':111 'account':81 'across':52 'advertis':86,119 'ai-inference' 'ai/ml':55 'analysi':148 'analyt':54 'api':5,14,21,30,39,79,110,182 'attach':89 'avail':214 'base':8,24,70,125,132 'base usdc api' 'bodi':233 'broad':44 'broader':142 'call':4,20,63 'caller':87 'catalog':45 'challeng':118,224 'classif':151 'classification' 'confirm':218 'connect':191 'content':197 'convers':163 'cost':64 'crawler':200 'crypto-data' 'data':53,58,165 'data-analytics' 'decim':140 'doc':181 'document':176,209,227 'embed':152 'embeddings' 'enabl':38 'endpoint':51,103,145,216,236 'equal':134 'estim':160 'exampl':212 'exchang':155 'expect':237 'extrem':178 'feed':154 'finance-data' 'finance/web3':57 'gas':159 'generat':166 'geocod':161 'geocoding' 'given':136 'header':94 'infer':56 'key':15,31,80 'limit':84 'list':107,144 'live':219 'low payment fee' 'lowpaymentfee.com':33 'maxamountrequir':121 'micropayment api' 'network':71 'no-api-key' 'no-auth api' 'offer':42 'openapi':204 'page':186 'pay':2,18,48 'pay per call api' 'pay-per-cal':1,17 'pay-per-request':47 'payload':213 'payment':76,93,99 'per':3,19,49,172 'platform':6,22,40,143 'point':175 'post':114 'premium':109 'price':153,174,183 'prompt':193 'proof':100 'proper':222 'protocol':77 'quot':158 'rate':83,156 'readm':185 'render':188 'request':50,115,173,232 'request/response':207 'requir':16,32 'respons':240 'return':220,242 'schema':208 'sentiment':147 'sentiment-analysis' 'servic':61 'settl':72 'simpli':88 'spars':179 'spec':205 'specif':102,235 'summar':150 'text':149 'text-summarization' 'token':157 'unclear':230 'unit':126 'usdc':67,128,137 'usdc-base' 'util':60 'utility-services' 'valid':97,162 'via':9,25,73 'visibl':198 'wallet':192 'without':226 'x':92 'x-payment':91 'x402':10,26,37,75,98,117 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"bd17d7e7-4aab-458d-bb05-8154be86af37","listingId":"7dcfeb6b-6e19-42bd-9e89-3ab470351f11","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/payments/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:38.394Z"}],"sources":[{"listingId":"7dcfeb6b-6e19-42bd-9e89-3ab470351f11","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/169","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:38.394Z","lastSeenAt":"2026-04-23T05:01:22.181Z"}],"details":{"listingId":"7dcfeb6b-6e19-42bd-9e89-3ab470351f11","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/169 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/payments/169 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/payments/169"},{"claim":"Listed endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility service paid per request via x402","Programmatic data export and analytics without subscription commitments"],"bestFor":["AI agents and bots that can settle x402 payments on Base","Developers wanting zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where $0.02/call is cost-effective"],"notFor":["High-volume production workloads where per-call costs add up quickly","Users who need detailed API documentation or SLAs before integrating","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.292Z"},"updatedAt":"2026-04-23T05:01:22.181Z"}}