{"id":"c7d4727f-6e73-4d05-9aaa-e387db3fd714","shortId":"DZFyLJ","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, 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, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, rate limits, or upfront commitments.\n\nThe specific endpoint `/api/v1/item/16` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment scheme is \"exact\" and the asset contract is the canonical Base USDC address (0x8335…). The endpoint accepts HTTP POST and returns `application/json`.\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 per request price point. However, documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further technical detail, so request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion","data-export"],"categories":["api-marketplace","llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","no api key","on-chain api payment"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no technical content","The specific endpoint /api/v1/item/16 has no description beyond 'Premium API Access'; its actual functionality is unknown","No request or response schemas are provided for any endpoint on the platform","The platform lists many endpoint categories but it is unclear whether all are fully functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/16","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/item/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($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 ('Connect wallet' only). The purpose of `/api/v1/item/16` specifically is unclear — it is labeled generically as 'Premium API Access' with no further detail. This is effectively a stub 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'/request':13,32 '0.02':12,31,70,114,177 '000':109 '0x8335':138 '20':108 '402':103 '6':119 'accept':141 'access':99 'across':58 'address':137 'advertis':150 'ai-inference' 'ai/ml':61 'analysi':154 'analyt':60 'api':5,17,24,36,45,83,98 'application/json':146 'asset':130 'base':8,27,75,110,122,135 'base network api' 'beyond':185 'broad':50 'broader':148 'call':4,23,68 'canon':134 'catalog':51 'chain':80 'challeng':104 'classif':157 'classification' 'commit':89 'connect':192 'contract':131 'convers':169 'conversion' 'cost':69 'crypto-quotes' 'data':59,171 'data-analytics' 'data-export' 'decim':120 'detail':199 'document':183 'embed':158 'embeddings' 'enabl':44 'endpoint':57,92,140,151,205 'estim':166 'exact':127 'exchang':161 'feed':160 'finance-data' 'finance/web3':63 'gas':165 'gas-estimates' 'generat':172 'geocod':167 'geocoding' 'howev':182 'http':142 'individu':204 'infer':62 'infrastructur':65 'key':18,37,84 'land':187 'limit':86 'list':95 'low payment fee' 'lowpaymentfee.com':39 'micropayment api' 'network':9,28,76 'no api key' 'offer':48 'on-chain':78 'on-chain api payment' 'page':184,188 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':124 'per':3,22,55,178 'platform':6,25,46,149 'point':181 'post':143 'premium':97 'price':159,180 'prompt':194 'quot':164 'rate':85,162 'request':56,105,179 'request/response':201 'requir':19,38 'return':101,145,189 'schema':202 'scheme':125 'sentiment':153 'sentiment-analysis' 'settl':77 'sinc':116 'specif':91 'summar':156 'technic':198 'text':155 'text-summarization' 'token':163 'unit':111 'unknown':207 'upfront':88 'usd':115 'usdc':15,34,72,113,117,136 'usdc api' 'usdc-base' 'use':118 'util':66 'valid':168 'validation' 'via':10,29 'wallet':193 'x402':11,30,43 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"087b5e98-fab9-44f1-91b7-183bbe33ff4a","listingId":"c7d4727f-6e73-4d05-9aaa-e387db3fd714","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/item/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:27.707Z"}],"sources":[{"listingId":"c7d4727f-6e73-4d05-9aaa-e387db3fd714","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:27.707Z","lastSeenAt":"2026-04-23T20:01:26.699Z"}],"details":{"listingId":"c7d4727f-6e73-4d05-9aaa-e387db3fd714","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/16 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/item/16"},{"claim":"All endpoints are 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":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no further 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","Geocoding or data validation as a utility service paid in USDC on Base","Exporting or analyzing data through analytics endpoints with no subscription"],"bestFor":["AI agents with Base USDC wallets needing diverse utility endpoints","Developers who want zero-commitment, pay-as-you-go API access","Workflows requiring multiple endpoint types (AI, finance, geo) from a single provider"],"notFor":["Users who need detailed API documentation or guaranteed SLAs — docs are currently minimal","High-volume production workloads where $0.02/request adds up and bulk pricing would be preferred","Users without a crypto wallet or USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:01:22.724Z"},"updatedAt":"2026-04-23T20:01:26.699Z"}}