{"id":"731dc5d0-dd2a-4db3-8a9c-e2f1f2423df2","shortId":"aHZFMH","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 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 via the x402 protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/payments/343` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum required amount of 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimal places. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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 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","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","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","no-key api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no technical content","No OpenAPI or schema available — request and response formats are unknown","The specific purpose of /api/v1/payments/343 ('Premium API Access') is not documented; it is unclear how it differs from other endpoints","No examples of successful responses are available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/343","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/343","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 captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific '/payments/343' endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/request':12,28 '0.02':11,27,61,142,191 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':155 '0x8335':136 '20':129 '2913':137 '300':158 '6':146 'accept':117 'access':102,115 'address':154 'advertis':164 'ai-inference' 'ai/ml':51 'amount':127 'analysi':168 'analyt':50 'api':5,14,21,30,39,78,114,201 'attach':89 'avail':231 'base':8,24,69,131,139 'base usdc api' 'broad':44 'broader':162 'call':4,20 'caller':87 'catalog':45 'challeng':122 'classif':171 'classification' 'commit':86 'connect':210 'content':235 'contract':135 'convers':183 'cost':60 'crawl':234 'crypto-data' 'data':49,54,185 'data-analytics' 'decim':147 'detail':217 'doc':200 'document':195,226 'embed':172 'embeddings' 'enabl':38 'endpoint':47,59,104,107,165 'equal':141 'estim':180 'everi':58 'exampl':230 'exchang':175 'extrem':197 'feed':174 'finance-data' 'finance/web3':53 'gas':179 'generat':186 'geocod':181 'geocoding' 'given':143 'header':94 'howev':194 'indic':123 'infer':52 'key':15,31,79 'limit':82 'list':111 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'maximum':125 'micropayment api' 'network':70 'no-api-key' 'no-key api' 'offer':42 'openapi':221 'page':205 'paid':64 'pay':2,18 'pay per call api' 'pay-per-cal':1,17 'pay-per-request' 'payment':93,99,150 'per':3,19,62 'place':148 'platform':6,22,40,163 'point':193 'post':118 'premium':113 'price':173,192,202 'prompt':212 'proof':100 'protocol':74 'quot':178 'rate':81,176 'readm':204 'render':207 'request':63,119 'request/response':224 'requir':16,32,126 'schema':225 'second':159 'sent':152 'sentiment':167 'sentiment-analysis' 'servic':57 'simpli':88 'span':48 'spars':198 'spec':222 'specif':106 'subscript':85 'summar':170 'technic':216 'text':169 'text-summarization' 'timeout':160 'token':177 'unit':132 'usag':229 'usdc':66,134,144 'usdc-base' 'util':56 'utility-services' 'valid':97,182 'via':9,25,71 'wallet':211 'x':92 'x-payment':91 'x402':10,26,37,73,98,121 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"353de572-36bd-4f2c-86e4-48895c3a84d2","listingId":"731dc5d0-dd2a-4db3-8a9c-e2f1f2423df2","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/343","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:28.975Z"}],"sources":[{"listingId":"731dc5d0-dd2a-4db3-8a9c-e2f1f2423df2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/343","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:28.975Z","lastSeenAt":"2026-04-22T15:01:38.718Z"}],"details":{"listingId":"731dc5d0-dd2a-4db3-8a9c-e2f1f2423df2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/343 \\\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":"Platform offers endpoints at $0.02/request with no API keys, no rate limits, and payment on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/343"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without managing API keys or subscriptions","Fetching real-time crypto token quotes, gas estimates, and exchange rates via micropayment","Running geocoding, validation, or data conversion utilities on a per-call basis","Exporting analytics data or generating insights reports with pay-as-you-go pricing"],"bestFor":["Agents or bots that need frictionless, keyless API access paid per call","Developers prototyping with multiple API categories without upfront commitments","Web3-native workflows that can settle USDC payments on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.951Z"},"updatedAt":"2026-04-22T15:01:38.718Z"}}