{"id":"d367cc17-5943-4153-a0b7-b9258ab67365","shortId":"Fn9Hma","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility/infrastructure services. All endpoints are priced at $0.02 per request, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/180` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment timeout is 300 seconds. The broader platform also exposes endpoints for 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.\n\nNote that the exact functionality behind `/api/v1/messages/180` is not documented beyond the generic \"Premium API Access\" label. No OpenAPI schema, request/response examples, or detailed documentation were found for this specific endpoint. The crawled docs and pricing pages returned only wallet-connect prompts with no additional content.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation found for /api/v1/messages/180 — its actual functionality is unknown","No OpenAPI or request/response schema available","Crawled /api, /pricing, and /README pages returned no useful content (wallet-connect only)","The endpoint name 'Premium API Access' is generic and does not describe what the endpoint does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/180","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/180","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 documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/messages/180 is unknown beyond the generic 'Premium API Access' label. The crawled pages beyond the homepage returned only wallet-connect 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'/request':13,28 '0.02':12,27,65,130,172 '000':118 '0x8335':124 '20':117 '2913':125 '300':140 '6':134 'Base network API' 'USDC API' 'accept':106 'access':7,22,104,190 'account':78 'addit':220 'advertis':112 'ai/ml':53 'also':145 'analysi':150 'analyt':52 'api':6,21,37,76,103,189 'asset':123 'attach':86 'base':9,24,73,119,127 'base-network' 'behind':180 'beyond':185 'broad':42 'broader':143 'call':4,19 'caller':84 'catalog':43 'challeng':111 'classif':153 'connect':216 'content':221 'convers':165 'cost':115 'crawl':207 'crypto-paid API' 'data':51,56 'decim':135 'detail':198 'doc':208 'document':184,199 'embed':154 'enabl':36 'endpoint':49,61,96,147,205 'equal':129 'estim':162 'exact':178 'exampl':196 'exchang':157 'expos':146 'feed':156 'finance/web3':55 'found':201 'function':179 'gas':161 'generat':167 'generic':187 'geocod':163 'given':131 'header':90 'infer':54 'key':77 'label':191 'limit':81 'list':100 'lowpaymentfee' 'lowpaymentfee.com':31 'maximum':114 'micropayment API' 'network':74 'no-api-key' 'no-rate-limit' 'note':175 'offer':40 'openapi':193 'page':211 'pay':2,17,46 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':45 'payment':89,137 'per':3,18,47,66 'per-request-billing' 'platform':38,144 'point':174 'post':107 'post-endpoint' 'premium':5,20,102,188 'premium API access' 'price':63,155,173,210 'prompt':217 'quot':160 'rate':80,158 'request':48,67,93,108 'request/response':195 'requir':83 'return':212 'schema':194 'second':141 'sentiment':149 'servic':59 'settl':68 'simpli':85 'span':50 'specif':95,204 'summar':152 'text':151 'timeout':138 'token':159 'unit':120 'usdc':15,30,70,122,132 'usdc-settlement' 'utility/infrastructure':58 'valid':164 'via':10,25 'wallet':215 'wallet-connect':214 'x402':11,26,35,88,110 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"b7b5401f-72c3-4cc2-8dd8-5dd6c2dacad0","listingId":"d367cc17-5943-4153-a0b7-b9258ab67365","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/180","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.569Z"}],"sources":[{"listingId":"d367cc17-5943-4153-a0b7-b9258ab67365","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/180","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.569Z","lastSeenAt":"2026-04-22T02:32:07.244Z"}],"details":{"listingId":"d367cc17-5943-4153-a0b7-b9258ab67365","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/180 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/180"},{"claim":"All endpoints are priced at $0.02/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"}],"useCases":["Accessing premium API functionality with instant crypto micropayments and no signup","Integrating pay-per-use endpoints into AI agent workflows via x402 protocol","Making one-off API calls without managing API keys or subscriptions"],"bestFor":["Developers and agents wanting frictionless pay-per-call API access","x402-compatible clients on the Base network","Use cases where avoiding API key management and rate limits is valuable"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume callers who would benefit from bulk/subscription pricing rather than per-call fees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.768Z"},"updatedAt":"2026-04-22T02:32:07.244Z"}}