{"id":"78ebb978-450a-4367-bb44-7bf44cc09564","shortId":"4pUzQw","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. 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 `/api/v1/messages/66` is listed as \"Premium API Access\" and follows the same x402 payment pattern. Its 402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`.\n\nThe provider's landing page lists 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). All share the same $0.02 pricing. No OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawl, so the exact input parameters and response shapes for each endpoint remain unknown.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","data-analytics","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","cheap API calls","402 payment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/messages/66 has no description beyond 'Premium API Access' — its actual functionality is unknown","No request body schema or response schema documented; callers must guess at input format","Pricing and /api pages returned no meaningful content beyond 'Connect wallet'","The breadth of advertised capabilities (AI, analytics, finance, geo) is unverifiable without documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/66","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/66","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema documentation, no usage examples, and the specific purpose of /api/v1/messages/66 is entirely opaque beyond the generic label 'Premium API Access'. Most pages behind the landing page returned only 'Connect wallet' with no useful 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'/request':18,36 '0.02':17,35,68,135,197 '000':125 '0x8335':130 '16':156 '20':124 '402':118 '402 payment API' '6':139 'Base network API' 'USDC API' 'accept':143 'access':109 'advertis':120 'ai':11,29,168 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':172 'analyt':12,30,54,163 'api':5,23,43,81,108 'application/json':148 'attach':92 'base':8,26,76,126,132 'broad':48 'call':4,22 'caller':90 'categori':161 'challeng':119 'cheap API calls' 'classif':175 'collect':49 'commit':89 'convers':191 'conversion' 'cover':10,28 'crawl':212 'crypto-quotes' 'data':53,58,162 'data-analytics' 'decim':140 'detail':202 'document':204 'embed':176 'enabl':42 'endpoint':51,64,102,142,157,223 'equal':134 'estim':186 'everi':63 'exact':215 'exampl':207 'exchang':181 'export':166 'feed':180 'financ':13,31,177 'finance-data' 'finance/web3':57 'follow':111 'found':209 'four':160 'gas':185 'gas-estimates' 'general':60 'generat':192 'geocod':189 'geocoding' 'given':136 'header':96 'http':144 'infer':56 'infrastructur':61,188 'input':216 'insight':167 'key':82 'land':152 'learn':170 'limit':85 'list':105,154 'low payment fee API' 'lowpaymentfee.com':37 'machin':169 'maxamountrequir':122 'metric':164 'micropayment API' 'network':77 'offer':46 'openapi':200 'organ':158 'page':153 'paramet':217 'pattern':116 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'payment':95,115 'per':3,21,69 'per-call-pricing' 'platform':44 'post':145 'premium':107 'price':66,179,198 'provid':150 'quot':184 'rate':84,182 'remain':224 'report':165 'request':70,99 'request/response':203 'respons':219 'return':147 'rough':155 'schema':201 'sentiment':171 'settl':71 'shape':220 'share':194 'simpli':91 'span':52 'specif':101 'suit':6,24 'summar':174 'text':173 'token':183 'unit':127 'unknown':225 'upfront':88 'usag':206 'usdc':9,27,73,129,137 'usdc-base' 'util':15,33,62 'valid':190 'validation' 'web3':178 'x402':41,94,114 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"9b50ec3a-e8fb-45bf-8802-40096d54f754","listingId":"78ebb978-450a-4367-bb44-7bf44cc09564","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.233Z"}],"sources":[{"listingId":"78ebb978-450a-4367-bb44-7bf44cc09564","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.233Z","lastSeenAt":"2026-04-22T02:32:08.313Z"}],"details":{"listingId":"78ebb978-450a-4367-bb44-7bf44cc09564","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/66 \\\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 for /api/v1/messages/66 shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/66"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto token quotes and gas estimates on demand","Geocoding addresses or validating data with per-call billing","Exporting analytics data or generating insights via pay-as-you-go endpoints","Embedding text for search or retrieval-augmented generation workflows"],"bestFor":["Agents or bots that need low-friction, keyless API access with crypto micropayments","Developers prototyping with multiple utility endpoints at uniform low cost","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads that need SLA guarantees and documented rate limits","Users who require detailed OpenAPI schemas and comprehensive documentation before integration","Teams that cannot or prefer not to settle payments in on-chain USDC"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.817Z"},"updatedAt":"2026-04-22T02:32:08.313Z"}}