{"id":"94260475-8df5-4643-a171-7fd69dc5afe3","shortId":"m4pVEy","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 collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/customers/87` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the `exact` scheme with a 300-second timeout window.\n\nThe broader platform advertises additional endpoints including 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/request price point. Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas for individual endpoints are not publicly available.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","no-auth API"],"warnings":["No OpenAPI or request/response schema available for this endpoint","Documentation pages are gated behind wallet connection and contain no public content","The specific purpose of /api/v1/customers/87 is unclear — 'Premium API Access' is a generic label","This endpoint path (/customers/87) with a numeric ID suggests it may return customer-specific data, but no details are documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/87","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/87","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 402 challenge with clear pricing. However, there is no OpenAPI schema, no documented request/response format for this specific endpoint, and the docs/pricing/README pages are all gated behind wallet connection, yielding no useful content. The purpose of the `/api/v1/customers/87` endpoint specifically is unclear beyond the generic 'Premium API Access' 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'/request':19,38,177 '0.02':18,37,125,176 '000':115 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '20':114 '300':141 '6':130 'Base network API' 'USDC API' 'accept':103 'access':101 'addit':149 'advertis':148 'ai':12,31 'ai-inference' 'ai/ml':57 'analysi':153 'analyt':56 'api':5,24,45,82,100 'appear':184 'avail':200 'base':8,27,75,116,122 'behind':186 'broad':50 'broader':146 'call':4,23 'challeng':108 'classif':156 'classification' 'collect':51 'connect':189 'convers':168 'cost':112 'cover':10,29 'crypto-data' 'data':11,30,55,60,170 'data-analytics' 'decim':131 'detail':191 'document':180 'embed':157 'embeddings' 'enabl':44 'endpoint':16,35,53,66,93,150,196 'equal':124 'estim':165 'exact':137 'exchang':160 'exist':182 'feed':159 'financ':13,32 'finance-data' 'finance/web3':59 'gas':164 'gate':185 'general':62 'generat':171 'geocod':166 'geocoding' 'includ':151 'indic':109 'individu':195 'infer':58 'key':83 'limit':86 'list':97 'low payment fee' 'lowpaymentfee.com':39 'made':134 'maximum':111 'micropayment API' 'network':76 'no-auth API' 'offer':48 'page':181 'paid':68 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'payment':132 'per':3,22,69,126 'per-request-pricing' 'platform':6,25,46,147 'point':179 'post':104 'premium':99 'price':158,178 'protocol':80 'public':199 'quot':163 'rate':85,161 'request':70,105,127 'request/response':192 'requir':90 'schema':193 'scheme':138 'second':142 'sentiment':152 'sentiment-analysis' 'servic':64 'span':54 'specif':92 'subscript':89 'summar':155 'text':154 'text-summarization' 'timeout':143 'token':162 'unit':117 'usdc':9,28,72,119,128 'usdc-base' 'use':71,129 'util':15,34,63 'utility-services' 'valid':167 'via':77,135 'wallet':188 'window':144 'x402':43,79,107 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a62d55c2-06fb-4825-addb-a5d0ec8e5be5","listingId":"94260475-8df5-4643-a171-7fd69dc5afe3","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:54.183Z"}],"sources":[{"listingId":"94260475-8df5-4643-a171-7fd69dc5afe3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:54.183Z","lastSeenAt":"2026-04-22T20:00:37.129Z"}],"details":{"listingId":"94260475-8df5-4643-a171-7fd69dc5afe3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/87 \\\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 on Base with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/customers/87"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/87"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto token quotes and gas estimates programmatically","Running geocoding or data validation as a utility microservice","Exporting analytics data or generating insights reports on demand","Accessing exchange rates and price feeds for financial applications"],"bestFor":["AI agents that need frictionless, keyless API access via crypto micropayments","Developers prototyping with multiple API categories under a single payment model","Applications on Base network that want native USDC-settled API calls"],"notFor":["Users who need free or subscription-based API access without crypto wallets","High-volume production workloads where $0.02/request adds up significantly","Users requiring detailed OpenAPI schemas or comprehensive documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.584Z"},"updatedAt":"2026-04-22T20:00:37.129Z"}}