{"id":"2e44294a-cf5d-4d36-b418-23b3a8f05f4d","shortId":"bRDM6b","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, 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. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/payments/1` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises 16+ endpoints across four categories: 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). Documentation pages exist but appear to require a wallet connection and contain no visible content. No OpenAPI spec or detailed request/response schemas were found, so the exact input parameters and response formats for each endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","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-request API","USDC API","Base network API","micropayment API","no-auth API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no visible content","The specific endpoint /api/v1/payments/1 is not listed among the 16 advertised endpoints on the homepage; its exact function is unclear","No rate limit or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/1","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and confirms pricing and network details. However, there is no OpenAPI spec, no documentation content (all doc pages just show 'Connect wallet'), no request/response schemas, and no examples. The purpose of the specific /api/v1/payments/1 endpoint is unclear beyond the generic 'Premium API Access' 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'/request':13,30 '0.02':12,29,63,143 '000':132 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '0x8335':137 '16':164 '20':131 '2913':138 '300':157 '6':147 'Base network API' 'USDC API' 'accept':118 'access':116 'across':166 'address':153 'advertis':163 'ai':176 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':53 'analysi':180 'analyt':52,170 'api':5,15,22,32,41,80,115 'appear':205 'attach':92 'base':8,25,71,133,140 'broad':46 'broader':161 'call':4,21 'caller':90 'categori':168 'challeng':123 'classif':183 'confirm':124 'connect':210 'contain':212 'content':215 'convers':199 'conversion' 'cost':62 'crypto-gas-estimates' 'crypto-paid API' 'data':51,56,169,173 'data-analytics' 'decim':148 'detail':220 'document':201 'embed':184 'enabl':40 'endpoint':49,61,108,165,235 'equal':142 'estim':194 'everi':60 'exact':227 'exchang':189 'exchange-rates' 'exist':203 'export':174 'feed':188 'financ':185 'finance-price-feeds' 'finance/web3':55 'format':232 'found':224 'four':167 'gas':193 'generat':200 'geocod':197 'geocoding' 'given':144 'header':97 'infer':54 'infrastructur':196 'input':228 'insight':175 'key':16,33,81 'learn':178 'limit':89 'list':112 'live':127 'low payment fee' 'lowpaymentfee.com':35 'machin':177 'mean':76 'metric':171 'micropayment API' 'network':72 'no-auth API' 'offer':44 'openapi':217 'page':202 'paid':66 'paramet':229 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request API' 'payment':96,101,149 'per':3,20,64 'platform':6,23,42,162 'post':119 'premium':114 'price':187 'proof':102 'protocol':75 'quot':192 'rate':88,190 'remain':236 'report':172 'request':65,105,120,128 'request/response':221 'requir':17,34,207 'respons':231 'schema':222 'second':158 'sent':151 'sentiment':179 'servic':59 'set':47 'sign':84 'sign-up':83 'simpli':91 'span':50 'spec':218 'specif':107 'summar':182 'text':181 'timeout':159 'token':191 'unit':134 'unknown':237 'up':85 'usdc':9,26,68,136,145 'usdc-base' 'util':58 'valid':100,198 'validation' 'via':10,27 'visibl':214 'wallet':209 'web3':186 'x':95 'x-payment':94 'x402':11,28,39,74,122 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"4c27afdf-363b-45be-8ec7-33bc67806601","listingId":"2e44294a-cf5d-4d36-b418-23b3a8f05f4d","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:29.912Z"}],"sources":[{"listingId":"2e44294a-cf5d-4d36-b418-23b3a8f05f4d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:29.912Z","lastSeenAt":"2026-04-22T15:01:34.156Z"}],"details":{"listingId":"2e44294a-cf5d-4d36-b418-23b3a8f05f4d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/1 \\\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 offers 16+ endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $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 at /api/v1/payments/1 requires up to 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, paid to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/payments/1"}],"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","Running data analytics or generating reports via simple HTTP POST with USDC micropayments","Geocoding, data validation, or format conversion as utility microservices"],"bestFor":["AI agents and bots that can settle payments on Base via x402","Developers who want instant API access without sign-up or subscription","Low-volume or bursty workloads where $0.02/call flat pricing is economical"],"notFor":["High-volume production workloads where per-call costs would accumulate significantly","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, guaranteed uptime, or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.767Z"},"updatedAt":"2026-04-22T15:01:34.156Z"}}