{"id":"653c77e2-615b-468d-bf82-e268cb4fca6f","shortId":"MgDhmg","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities 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 infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/181` is listed as \"Premium API Access\" and follows the same x402 exact-payment scheme. Its 402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. Beyond this particular path, the platform advertises roughly 16 endpoints organized into four categories: Data & Analytics (metrics, reports, 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).\n\nNo OpenAPI schema, detailed request/response documentation, or usage examples were found during the crawl — the pricing, README, and API pages all returned only a \"Connect wallet\" prompt. As a result, the exact input parameters and response shapes for this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-api","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","analytics","finance-data","crypto-data","geocoding","data-export"],"categories":["llm","search","geo","finance"],"synonyms":["low payment fee","x402 api","pay per request api","micropayment api","usdc api","base network api","cheap api calls","402 payment api"],"warnings":["No OpenAPI or request/response schema available — input parameters and response format are unknown","Documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content","The specific endpoint path /api/v1/messages/181 labeled 'Premium API Access' does not match any of the 16 advertised endpoint categories, making its function unclear","No SLA, rate-limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/181","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/messages/181","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. However, there is no OpenAPI spec, no request/response schema documentation, no usage examples, and the crawled docs pages are empty beyond a wallet-connect prompt. The purpose of the specific /messages/181 path is unclear. This is effectively a stub 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'/request':18,36 '0.02':17,35,68,144 '000':133 '0x8335':138 '16':166 '20':132 '2913':139 '402':126 '402 payment api' '6':148 'accept':152 'access':115 'advertis':128,164 'ai':11,29,178 'ai-inference' 'ai/ml':55 'analysi':182 'analyt':12,30,54,173 'analytics' 'api':5,23,43,86,114,221 'application/json':157 'attach':97 'base':8,26,76,134,141 'base network api' 'beyond':158 'broad':48 'call':4,22 'caller':95 'categori':171 'challeng':127 'cheap api calls' 'classif':185 'classification' 'collect':49 'commit':94 'connect':227 'convers':201 'cover':10,28 'crawl':216 'crypto-data' 'data':53,58,172 'data-export' 'decim':149 'detail':206 'document':208 'embed':186 'embeddings' 'enabl':42 'endpoint':51,64,107,151,167,242 'equal':143 'estim':196 'everi':63 'exact':122,234 'exact-pay':121 'exampl':211 'exchang':191 'export':176 'feed':190 'financ':13,31,187 'finance-data' 'finance/web3':57 'follow':117 'found':213 'four':170 'gas':195 'general':60 'generat':202 'geocod':199 'geocoding' 'given':145 'header':101 'http':153 'infer':56 'infrastructur':61,198 'input':235 'insight':177 'json-api' 'key':87 'learn':180 'limit':90 'list':111 'low payment fee' 'lowpaymentfee.com':37 'machin':179 'maxamountrequir':130 'metric':174 'micropayment api' 'network':77 'offer':46 'openapi':204 'organ':168 'page':222 'paramet':236 'particular':160 'path':161 'pay':2,20 'pay per request api' 'pay-per-cal':1,19 'pay-per-call' 'payment':81,100,123 'per':3,21,69 'platform':44,163 'post':154 'premium':113 'price':66,189,218 'prompt':229 'protocol':82 'quot':194 'rate':89,192 'readm':219 'report':175 'request':70,104 'request/response':207 'respons':238 'result':232 'return':156,224 'rough':165 'schema':205 'scheme':124 'sentiment':181 'sentiment-analysis' 'settl':71 'shape':239 'simpli':96 'span':52 'specif':106 'suit':6,24 'summar':184 'text':183 'text-summarization' 'token':193 'unit':135 'unknown':244 'upfront':93 'usag':210 'usdc':9,27,73,137,146 'usdc api' 'usdc-base' 'util':15,33,62 'valid':200 'via':78 'wallet':228 'web3':188 'x402':41,80,99,120 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"c26a97ac-5687-48bf-81ba-b80b4b5f77bf","listingId":"653c77e2-615b-468d-bf82-e268cb4fca6f","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/messages/181","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.727Z"}],"sources":[{"listingId":"653c77e2-615b-468d-bf82-e268cb4fca6f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/181","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.727Z","lastSeenAt":"2026-04-22T02:32:07.642Z"}],"details":{"listingId":"653c77e2-615b-468d-bf82-e268cb4fca6f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/181 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/181"},{"claim":"Platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval where per-call micropayments replace API key management","On-demand AI inference (sentiment, summarization, classification, embeddings) without subscription","Fetching real-time crypto gas estimates or token quotes with instant USDC settlement","Geocoding or data conversion as a utility service paid per call"],"bestFor":["AI agents that need low-friction, keyless API access via x402","Developers prototyping with multiple API categories at a flat $0.02/call","Web3-native applications already holding USDC on Base"],"notFor":["High-volume production workloads where $0.02/call adds up quickly without bulk discounts","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.552Z"},"updatedAt":"2026-04-22T02:32:07.642Z"}}