{"id":"67fd33ac-ef31-443a-8db5-8ff39045b656","shortId":"Xnyqaj","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 minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/37` is listed as \"Premium API Access\" and follows the same x402 payment pattern. Its exact functionality is not documented beyond the generic title; it likely serves a messaging or content-retrieval purpose given its path structure, but the crawl material does not clarify this. The x402 challenge confirms it is live, accepts POST requests, and requires up to 20,000 base units of USDC (i.e., $0.02) per call on Base.\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 price point. No OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawl.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","messaging-api","no-api-key","no-rate-limit","ai-inference","analytics","finance-data","crypto-data","geocoding","text-summarization","sentiment-analysis","embeddings"],"categories":["api-marketplace","llm","finance","geo","utilities"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation found for any endpoint","The specific endpoint /api/v1/messages/37 has no description beyond 'Premium API Access' — its actual functionality is unknown","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content","Cannot verify what data or service this endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/37","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and network, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint's purpose is unclear. The broader platform lists many endpoints but provides no detail on any of 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'/request':18,36 '0.02':17,35,68,171,206 '000':165 '20':164 '402 payment api' 'accept':157 'access':110 'advertis':179 'ai':11,29 'ai-inference' 'ai/ml':55 'analysi':183 'analyt':12,30,54 'analytics' 'api':5,23,43,81,109 'attach':92 'base':8,26,76,166,175 'base network api' 'beyond':124 'broad':48 'broader':177 'call':4,22,173 'caller':90 'challeng':152 'clarifi':148 'classif':186 'collect':49 'commit':89 'confirm':153 'content':135 'content-retriev':134 'convers':198 'cover':10,28 'crawl':144,222 'crypto-data' 'data':53,58,200 'detail':212 'document':123,214 'embed':187 'embeddings' 'enabl':42 'endpoint':51,64,102,180 'estim':195 'everi':63 'exact':119 'exampl':217 'exchang':190 'feed':189 'financ':13,31 'finance-data' 'finance/web3':57 'follow':112 'found':219 'function':120 'gas':194 'general':60 'generat':201 'generic':126 'geocod':196 'geocoding' 'given':138 'header':96 'i.e':170 'infer':56 'infrastructur':61 'key':82 'like':129 'limit':85 'list':106 'live':156 'low payment fee' 'lowpaymentfee.com':37 'materi':145 'messag':132 'messaging-api' 'micropayment api' 'minimum':88 'network':77 'no-api-key' 'no-rate-limit' 'offer':46 'openapi':210 'path':140 'pattern':117 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'payment':95,116 'per':3,21,69,172 'per-call-pricing' 'platform':44,178 'point':208 'post':158 'premium':108 'price':66,188,207 'purpos':137 'quot':193 'rate':84,191 'request':70,99,159 'request/response':213 'requir':161 'retriev':136 'schema':211 'sentiment':182 'sentiment-analysis' 'serv':130 'settl':71 'simpli':91 'span':52 'specif':101 'structur':141 'suit':6,24 'summar':185 'text':184 'text-summarization' 'titl':127 'token':192 'unit':167 'usag':216 'usdc':9,27,73,169 'usdc api' 'usdc-base' 'util':15,33,62 'valid':197 'x402':41,94,115,151 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"393db41b-866a-48db-91b9-c8ecfa350ef2","listingId":"67fd33ac-ef31-443a-8db5-8ff39045b656","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.782Z"}],"sources":[{"listingId":"67fd33ac-ef31-443a-8db5-8ff39045b656","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.782Z","lastSeenAt":"2026-04-22T02:32:07.755Z"}],"details":{"listingId":"67fd33ac-ef31-443a-8db5-8ff39045b656","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/37 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/37","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-header>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/messages/37"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","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":"Payment is settled in USD Coin (USDC) on the Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium content or messages via a single micropayment per request","Running AI inference tasks (sentiment, summarization, classification, embeddings) without subscription","Fetching real-time crypto token quotes and gas estimates on demand","Geocoding addresses or validating data with no signup required","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["Agents or bots that need instant, keyless API access with crypto micropayments","Developers prototyping integrations who want zero-commitment pricing","Web3-native applications already operating on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume production workloads where $0.02/request adds up and bulk discounts are needed","Users without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.535Z"},"updatedAt":"2026-04-22T02:32:07.755Z"}}