{"id":"3df74998-6356-4d4a-a8aa-79f56ac0cc7a","shortId":"NcMwLQ","kind":"x402","title":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","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 utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/orders/17` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per call. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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 generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse (docs, pricing, and README pages all render only a \"Connect wallet\" prompt), so the actual request/response schemas for these endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","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","utility"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","no-key API"],"warnings":["Documentation pages (/docs, /pricing, /README, /api) are all empty — only a 'Connect wallet' prompt is rendered.","No OpenAPI or schema available; request and response formats for this endpoint are completely unknown.","The specific purpose of /api/v1/orders/17 ('Premium API Access') is not explained anywhere — it may be a demo or placeholder.","The platform lists many endpoints on its landing page but none have documented schemas or example payloads."],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/17","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/orders/17","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 schema, no request/response examples, and all documentation pages beyond the landing page are empty stubs ('Connect wallet'). The purpose of the specific /orders/17 endpoint is unclear beyond the generic 'Premium API Access' 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'/call':13,30 '0.02':12,29,63,131,175 '000':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':124 '20':117 '300':142 '6':127 'Base network API' 'USDC API' 'accept':107 'access':105 'actual':201 'addit':149 'address':138 'advertis':113,148 'ai-inference' 'ai/ml':53 'analysi':153 'analyt':52 'api':5,15,22,32,41,76,104 'asset':123 'attach':87 'base':8,25,71,119 'beyond':180 'broad':46 'broader':146 'call':133 'caller':85 'challeng':112 'classif':156 'classification' 'commit':84 'connect':196 'convers':168 'cost':62 'crypto-data' 'data':51,56 'data-analytics' 'decim':128 'doc':187 'document':179 'embed':157 'embeddings' 'enabl':40 'endpoint':49,61,97,150,206 'equat':129 'estim':165 'everi':60 'exchang':160 'extrem':185 'feed':159 'finance-data' 'finance/web3':55 'gas':164 'generat':170 'geocod':166 'geocoding' 'header':91 'howev':178 'includ':151 'infer':54 'key':16,33,77 'land':182 'limit':80 'list':101 'low payment fee' 'lowpaymentfee.com':35 'maxamountrequir':115 'micropayment API' 'network':72 'no-api-key' 'no-key API' 'offer':44 'page':183,191 'paid':66 'pay':2,19 'pay-per-call API' 'pay-per-request':1,18 'payment':90,134 'per':3,20,64,132 'platform':6,23,42,147 'point':177 'post':108 'premium':103 'price':158,176,188 'prompt':198 'quot':163 'rate':79,161 'readm':190 'render':193 'request':4,21,65,94,109 'request/response':202 'requir':17,34 'schema':203 'second':143 'sent':136 'sentiment':152 'sentiment-analysis' 'servic':59 'set':47 'simpli':86 'span':50 'spars':186 'specif':96 'subscript':83 'summar':155 'text':154 'text-summarization' 'timeout':144 'token':162 'unit':120 'unknown':208 'usdc':9,26,68,122 'usdc-base-network' 'util':58 'utility-services' 'valid':167 'via':10,27 'wallet':197 'x402':11,28,39,89,111 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"1f5cc876-7fed-40fa-b663-9c70fd42d437","listingId":"3df74998-6356-4d4a-a8aa-79f56ac0cc7a","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/orders/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:49.421Z"}],"sources":[{"listingId":"3df74998-6356-4d4a-a8aa-79f56ac0cc7a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:49.421Z","lastSeenAt":"2026-04-22T20:00:36.869Z"}],"details":{"listingId":"3df74998-6356-4d4a-a8aa-79f56ac0cc7a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/17 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/orders/17 requires maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equating to $0.02.","source_url":"https://lowpaymentfee.com/api/v1/orders/17"},{"claim":"The platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, and README pages render only a 'Connect wallet' prompt with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes or gas estimates with per-call payment","Running geocoding or data validation as a utility service from an autonomous agent","Exporting analytics data or generating reports with zero subscription overhead"],"bestFor":["AI agents needing keyless, pay-as-you-go API access","Developers who want to avoid API key management and subscriptions","Low-volume or bursty workloads where per-request pricing is cost-effective"],"notFor":["High-volume production workloads where bulk pricing would be cheaper","Users who need detailed API documentation and guaranteed SLAs","Callers who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.842Z"},"updatedAt":"2026-04-22T20:00:36.869Z"}}