{"id":"fefbecc5-d21a-4927-aebe-53e8de69221b","shortId":"64nCQr","kind":"x402","title":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","tagline":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/messages/179` is listed as \"Premium API Access\" and accepts POST requests. 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. Payment is made via the x402 exact scheme with a 300-second timeout.\n\nThe broader platform advertises endpoints for 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/request price point. However, the crawled documentation is extremely thin: the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further technical documentation, schemas, or example payloads. Without request/response schemas or usage examples, it is unclear what input format this specific endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call","USDC API","Base network API","crypto-paid API"],"warnings":["No request or response schema available — the endpoint's actual functionality is unknown","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no technical content","The endpoint path '/api/v1/messages/179' with description 'Premium API Access' gives no indication of what data or service it provides","No OpenAPI spec, no ai-plugin manifest, no agents.txt discovered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/179","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/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no API documentation, no request/response schema, no examples, and the endpoint's actual functionality (\"Premium API Access\" / \"messages/179\") is completely opaque. The /api, /pricing, and /README pages returned no useful 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'/api/v1/messages/179':88 '/pricing':181 '/readme':183 '/request':11,26,169 '0.02':10,25,62,119,168 '000':108 '0x8335':113 '20':107 '2913':114 '300':135 '6':123 'Base network API' 'USDC API' 'accept':96 'access':94 'across':50 'advertis':102,141 'ai/ml':53 'analysi':145 'analyt':52 'api':5,20,37,75,93 'base':8,23,67,109,116 'broad':42 'broader':139 'call':4,19,60 'catalog':43 'chain':72 'challeng':101 'classif':148 'connect':189 'convers':160 'cost':61,105 'crawl':174 'crypto-paid API' 'data':51,162 'decim':124 'document':175,196 'embed':149 'enabl':36 'endpoint':49,86,142,215 'equal':118 'estim':157 'exact':131 'exampl':199,206 'exchang':152 'expect':216 'extrem':177 'feed':151 'finance/web3':55 'format':212 'gas':156 'generat':163 'geocod':158 'given':120 'howev':172 'infer':54 'infrastructur':57 'input':211 'key':76 'limit':79 'list':90 'low payment fee' 'lowpaymentfee.com':31 'made':127 'maximum':104 'micropayment API' 'network':9,24,68 'no-api-key' 'no-rate-limit' 'offer':40 'on-chain':70 'page':184 'pay':2,17,46 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':45 'payload':200 'payment':15,30,125 'per':3,18,47 'platform':6,21,38,140 'point':171 'post':97 'post-endpoint' 'premium':92 'price':150,170 'prompt':191 'quot':155 'rate':78,153 'request':48,98 'request/response':202 'requir':83 'return':186,220 'schema':197,203 'scheme':132 'second':136 'sentiment':144 'settl':69 'specif':85,214 'subscript':82 'summar':147 'technic':195 'text':146 'thin':178 'timeout':137 'token':154 'unclear':209 'unit':110 'usag':205 'usdc':14,29,64,112,121 'usdc-base' 'util':58 'valid':159 'via':12,27,128 'wallet':190 'without':201 'x402':13,28,35,100,130 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"cdfcaf6d-836b-48ce-8a7d-a605a454b11e","listingId":"fefbecc5-d21a-4927-aebe-53e8de69221b","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/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.644Z"}],"sources":[{"listingId":"fefbecc5-d21a-4927-aebe-53e8de69221b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/179","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.644Z","lastSeenAt":"2026-04-22T02:32:07.413Z"}],"details":{"listingId":"fefbecc5-d21a-4927-aebe-53e8de69221b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/179 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/179"},{"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"}],"useCases":["Accessing premium API content with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Prototyping integrations without subscription commitments"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Users who prefer on-chain micropayments over API key management"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.646Z"},"updatedAt":"2026-04-22T02:32:07.413Z"}}