{"id":"d8f2109a-b262-4c85-8948-2b071b885bf8","shortId":"zkYRxW","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 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 sign-up — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/100` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost 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`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including 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-call price point. However, no OpenAPI schema, request/response examples, or detailed documentation were found during the crawl, so the exact input parameters and response shapes for any of these endpoints remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","data-analytics","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","data-export","no-api-key"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 API","pay per request API","USDC API","Base network API","micropayment API","cheap API calls"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact purpose and expected input/output of /api/v1/messages/100 is undocumented","Crawled /api, /pricing, and /README pages returned no meaningful content","The platform lists many endpoint categories but none have verifiable documentation","No SLA, uptime, or rate-limit information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/100","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/100","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 schema, no documentation, no request/response examples, and the crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The purpose of the specific /api/v1/messages/100 endpoint is unclear beyond its generic 'Premium API Access' 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'/request':18,36 '0.02':17,35,67,131,186 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':125 '20':119 '2913':126 '300':152 '6':135 'Base network API' 'USDC API' 'accept':139 'access':110 'addit':159 'advertis':114,158 'ai':11,29 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':163 'analyt':12,30,54 'api':5,23,43,80,109 'application/json':144 'attach':92 'base':8,26,75,121,128 'broad':48 'broader':156 'call':4,22,189 'caller':90 'challeng':113 'cheap API calls' 'classif':166 'collect':49 'convers':178 'cost':117 'cover':10,28 'crawl':205 'crypto-gas-estimates' 'data':53,58,180 'data-analytics' 'data-export' 'decim':136 'detail':199 'document':200 'embed':167 'enabl':42 'endpoint':51,63,102,138,160,218 'equal':130 'estim':175 'everi':62 'exact':208 'exampl':197 'exchang':170 'exchange-rates' 'feed':169 'financ':13,31 'finance-price-feeds' 'finance/web3':57 'found':202 'gas':174 'general':60 'generat':181 'geocod':176 'geocoding' 'given':132 'header':96 'howev':192 'http':140 'includ':161 'infer':56 'input':209 'key':81 'limit':84 'list':106 'low payment fee' 'lowpaymentfee.com':37 'maximum':116 'micropayment API' 'network':76 'no-api-key' 'offer':46 'openapi':194 'paramet':210 'pay':2,20 'pay per request API' 'pay-per-cal':1,19 'pay-per-call' 'payment':95,145 'per':3,21,68,188 'per-cal':187 'platform':44,157 'point':191 'post':141 'premium':108 'price':65,168,190 'quot':173 'rate':83,171 'remain':219 'request':69,99 'request/response':196 'respons':212 'return':143 'schema':195 'second':153 'sent':147 'sentiment':162 'settl':70 'shape':213 'sign':88 'sign-up':87 'simpli':91 'span':52 'specif':101 'suit':6,24 'summar':165 'text':164 'timeout':154 'token':172 'unit':122 'unknown':220 'usdc':9,27,72,124,133 'usdc-base' 'util':15,33,61 'valid':177 'x402':41,94,112 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"1ca50bdb-02e4-46f9-a6c2-5890e518e497","listingId":"d8f2109a-b262-4c85-8948-2b071b885bf8","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/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.976Z"}],"sources":[{"listingId":"d8f2109a-b262-4c85-8948-2b071b885bf8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.976Z","lastSeenAt":"2026-04-22T07:32:30.990Z"}],"details":{"listingId":"d8f2109a-b262-4c85-8948-2b071b885bf8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/100 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{\"message\": \"hello\"}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/100"},{"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":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/100"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto token quotes or gas estimates via a single paid HTTP call","Geocoding addresses or validating data on a per-request payment basis","Exporting analytics data or generating insights with no upfront commitment","Embedding text for search or retrieval-augmented generation workflows"],"bestFor":["Agents or bots that need keyless, pay-as-you-go API access","Developers prototyping with multiple API categories (AI, finance, geo) from one provider","Low-volume or sporadic usage where subscription pricing is wasteful"],"notFor":["High-volume production workloads where per-call costs add up quickly without bulk discounts","Use cases requiring detailed SLAs, uptime guarantees, or documented rate limits","Applications needing well-documented request/response schemas for strict type safety"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.773Z"},"updatedAt":"2026-04-22T07:32:30.990Z"}}