{"id":"0f5db417-94f8-4d33-9476-e0c70d75106f","shortId":"WwUN82","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, 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 & machine learning, finance & Web3, and 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/39` 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 generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling; the docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["llm","data","finance","geo"],"synonyms":["x402 API","pay-per-request API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/messages/39 is undocumented","Docs, pricing, and README pages returned no useful content beyond 'Connect wallet'","Broad claims about AI, finance, and utility endpoints cannot be independently verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/39","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/39","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 challenge, but there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the specific purpose of /api/v1/messages/39 is unclear. Most detail pages return only 'Connect wallet' with no 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'/request':18,36 '0.02':17,35,68,131,185 '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':12,30,55 'ai-inference' 'analysi':163 'analyt':54 'api':5,23,43,81,109 'application/json':144 'attach':92 'base':8,26,76,121,128 'broad':48 'broader':156 'call':4,22 'caller':90 'challeng':113 'classif':166 'classification' 'collect':49 'commit':89 'connect':212 'content':218 'convers':178 'cost':117 'cover':10,28 'crawl':201 'crypto-quotes' 'data':11,29,53 'data-analytics' 'decim':136 'detail':192 'doc':203 'document':193 'embed':167 'embeddings' 'enabl':42 'endpoint':51,64,102,138,160 'equal':130 'estim':175 'everi':63 'exampl':195 'exchang':170 'feed':169 'financ':13,31,58 'finance-data' 'found':199 'gas':174 'generat':180 'geocod':176 'geocoding' 'given':132 'header':96 'howev':188 'http':140 'includ':161 'infrastructur':61 'key':82 'learn':57 'limit':85 'list':106 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'maximum':116 'micropayment API' 'minimum':88 'network':77 'offer':46 'openapi':190 'page':207 'pay':2,20 'pay-per-cal':1,19 'pay-per-call' 'pay-per-request API' 'payload':197 'payment':95,145 'per':3,21,69 'platform':44,157 'point':187 'post':141 'premium':108 'price':66,168,186,204 'prompt':214 'quot':173 'rate':84,171 'readm':206 'request':70,99 'request/response':196 'return':143,209 'schema':191 'second':153 'sent':147 'sentiment':162 'sentiment-analysis' 'settl':71 'simpli':91 'span':52 'specif':101 'suit':6,24 'summar':165 'text':164 'text-summarization' 'timeout':154 'token':172 'unit':122 'usdc':9,27,73,124,133 'usdc-base' 'util':15,33,62 'utility-services' 'valid':177 'wallet':213 'web3':59 'x402':41,94,112 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"5d8cc686-2286-46d7-b12d-af414be9dc6a","listingId":"0f5db417-94f8-4d33-9476-e0c70d75106f","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/39","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":"0f5db417-94f8-4d33-9476-e0c70d75106f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.727Z","lastSeenAt":"2026-04-22T02:32:07.645Z"}],"details":{"listingId":"0f5db417-94f8-4d33-9476-e0c70d75106f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/39 \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/39"},{"claim":"All 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":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/39"}],"useCases":["Calling AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding or data validation tasks with instant pay-as-you-go pricing","Exporting data or generating analytics reports via lightweight HTTP calls"],"bestFor":["Agents and bots that need keyless, pay-per-call API access","Developers prototyping with multiple utility endpoints at low cost","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.552Z"},"updatedAt":"2026-04-22T02:32:07.645Z"}}