{"id":"31c7bf07-dad1-4109-9a85-ea107fb24a58","shortId":"fj3Lrf","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/wire/77` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) on Base.\n\nThe platform advertises categories including Data & Analytics (metrics, reports, data 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). However, the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual functionality behind each endpoint cannot be independently verified.\n\nPayment settles via the x402 \"exact\" scheme on Base using USDC (contract 0x8335…2913). The payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The endpoint accepts HTTP POST and returns application/json. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api gateway"],"warnings":["No documentation available — all doc/api/pricing/README pages show only 'Connect wallet' with no content","No OpenAPI or JSON schema describing request or response formats","The specific purpose of /api/v1/wire/77 ('Premium API Access') is unclear — it may be a generic or placeholder endpoint","Functionality of advertised endpoints (AI, analytics, finance, utils) is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/77","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/wire/77","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 pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages returned only 'Connect wallet' with no content. The actual functionality behind the 'Premium API Access' label and other listed endpoints cannot be 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'/request':13,28 '0.02':12,27,60,107 '000':101 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':201 '0x8335':195 '20':100 '2913':196 '6':111 'accept':204 'access':91 'across':45 'actual':174 'address':199 'advertis':117 'ai':127 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':48 'analysi':131 'analyt':47,121 'api':5,20,37,72,90,158 'application/json':209 'base':8,23,68,102,114,191 'base network api' 'behind':176 'call':4,19 'cannot':179 'categori':118 'challeng':96 'classif':134 'commit':79 'connect':165 'content':171 'contract':194 'convers':150 'conversion' 'crawl':154,222 'crypto api gateway' 'crypto-gas' 'data':46,51,120,124 'data-analytics' 'decim':112 'detail':216 'doc':157 'document':155,217 'embed':135 'enabl':36 'endpoint':44,56,83,178,203 'estim':145 'exact':188 'exampl':214 'exchang':140 'exchange-rates' 'export':125 'feed':139 'financ':136 'finance-prices' 'finance/web3':50 'found':219 'function':175 'gas':144 'generat':151 'geocod':148 'geocoding' 'given':108 'howev':152 'http':205 'i.e':106 'includ':119 'independ':181 'infer':49 'infrastructur':147 'insight':126 'key':73 'learn':129 'limit':76 'list':87 'low payment fee' 'lowpaymentfee.com':31 'machin':128 'marketplac':38 'metric':122 'micropayment api' 'network':9,24,69 'offer':40 'openapi':211 'page':156 'paid':63 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':183 'payto':198 'per':3,18,61 'platform':6,21,116 'post':206 'premium':89 'price':58,138,159 'prompt':167 'quot':143 'rate':75,141 'readm':160 'report':123 'request':62,97 'request/response':213 'requir':80 'return':93,162,208 'schema':212 'scheme':189 'sentiment':130 'servic':54 'settl':184 'specif':82 'substant':170 'summar':133 'text':132 'token':142 'unit':103 'usdc':15,30,65,105,109,193 'usdc api' 'usdc-base' 'use':192 'util':53 'valid':149 'validation' 'varieti':42 'verifi':182 'via':10,25,185 'wallet':166 'web3':137 'x402':11,26,35,95,187 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"652b8934-f16f-48d0-a48a-e265a098e8d5","listingId":"31c7bf07-dad1-4109-9a85-ea107fb24a58","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/wire/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:08.299Z"}],"sources":[{"listingId":"31c7bf07-dad1-4109-9a85-ea107fb24a58","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:08.299Z","lastSeenAt":"2026-04-22T07:01:44.811Z"}],"details":{"listingId":"31c7bf07-dad1-4109-9a85-ea107fb24a58","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/77 \\\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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/77"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/77"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) on a per-call basis without API keys","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running data analytics queries (metrics, reports, insights) with micro-payments","Using utility services like geocoding, validation, and data conversion"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agents or bots that can settle payments in USDC on Base via x402","Users who prefer no-signup, no-API-key access to diverse endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput with guaranteed SLAs or rate-limit guarantees","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.185Z"},"updatedAt":"2026-04-22T07:01:44.811Z"}}