{"id":"629573ac-7fa2-42a0-bccb-23e1ced220ce","shortId":"5RHBJj","kind":"x402","title":"Pay-per-call API platform on Base (USDC) — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol. 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 `/api/v1/inbox/42` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader 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, no OpenAPI schema, detailed documentation, or example request/response payloads are available for any of these endpoints, so the actual functionality behind each route is unverified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","no-api-key"],"categories":["ai","data","finance","infrastructure"],"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 available for any endpoint","The specific endpoint /api/v1/inbox/42 is not listed among the advertised API categories on the landing page — its purpose is unclear","No example request or response payloads are documented anywhere","The /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet')","Actual functionality behind each advertised endpoint is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/42","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/inbox/42","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 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation, no example requests or responses, and the actual functionality behind '/api/v1/inbox/42' (labeled only 'Premium API Access') is completely opaque. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful 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'/request':11,26 '0.02':10,25,61,127 '000':116 '0x8335':121 '20':115 '2913':122 '300':140 '402':110 '402 payment api' '6':131 'accept':145 'access':106 'actual':208 'advertis':154 'ai':164 'ai-inference' 'ai/ml':49 'analysi':168 'analyt':48,158 'api':5,13,20,28,37,78,105 'application/json':150 'attach':89 'avail':200 'base':8,23,69,117,124 'base network api' 'behind':210 'broad':42 'broader':152 'call':4,19 'caller':87 'catalog':43 'categori':155 'challeng':111 'classif':171 'classification' 'commit':86 'convers':187 'crypto-quotes' 'data':47,52,157,161 'data-analytics' 'decim':132 'detail':193 'document':194 'embed':172 'embeddings' 'enabl':36 'endpoint':45,57,99,144,205 'equal':126 'estim':182 'everi':56 'exact':137 'exampl':196 'exchang':177 'export':162 'feed':176 'financ':173 'finance-data' 'finance/web3':51 'function':209 'gas':181 'generat':188 'geocod':185 'geocoding' 'given':128 'header':93 'howev':189 'includ':156 'infer':50 'infrastructur':54,184 'insight':163 'key':14,29,79 'learn':166 'limit':82 'list':102 'low payment fee' 'lowpaymentfee.com':31 'machin':165 'metric':159 'micropayment api' 'minimum':85 'network':70 'no-api-key' 'offer':40 'openapi':191 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payabl':64 'payload':198 'payment':92,134 'per':3,18,62 'platform':6,21,38,153 'post':146 'premium':104 'price':59,175 'protocol':74 'quot':180 'rate':81,178 'report':160 'request':63,96,112,147 'request/response':197 'requir':15,30 'return':108,149 'rout':212 'schema':192 'scheme':135 'second':141 'sentiment':167 'sentiment-analysis' 'simpli':88 'span':46 'specif':98 'summar':170 'text':169 'text-summarization' 'timeout':142 'token':179 'unit':118 'unverifi':214 'usdc':9,24,66,120,129 'usdc api' 'usdc-base' 'util':55 'valid':186 'via':71 'web3':174 'x402':35,73,91 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"a7f12639-9eea-4a48-b0e7-111e85f4eba9","listingId":"629573ac-7fa2-42a0-bccb-23e1ced220ce","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/inbox/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.956Z"}],"sources":[{"listingId":"629573ac-7fa2-42a0-bccb-23e1ced220ce","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.956Z","lastSeenAt":"2026-04-22T02:32:01.167Z"}],"details":{"listingId":"629573ac-7fa2-42a0-bccb-23e1ced220ce","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/42 \\\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":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/inbox/42"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Calling AI inference endpoints (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-request basis","Running geocoding, validation, or data conversion tasks with instant pay-as-you-go access","Exporting data or pulling analytics metrics without subscription commitments"],"bestFor":["Agents or developers who want zero-setup, keyless API access paid per call","Low-volume or bursty workloads where subscriptions are wasteful","Web3-native applications already holding USDC on Base"],"notFor":["High-volume production workloads needing SLAs, rate guarantees, or dedicated support","Users without USDC on Base or unfamiliar with x402 payment flows","Anyone needing detailed API documentation or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.122Z"},"updatedAt":"2026-04-22T02:32:01.167Z"}}