{"id":"619bda93-a925-47fa-9f0c-5bf07052f5ea","shortId":"fAUPNs","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 platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. 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.\n\nThe specific endpoint at `/api/v1/transactions/243` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base (asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform also advertises 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. However, documentation beyond the landing page is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available, making it difficult to determine what inputs the endpoints expect or what outputs they return.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","crypto API gateway"],"warnings":["No OpenAPI or schema documentation available — all doc/pricing/README pages show only 'Connect wallet'","The specific purpose of /api/v1/transactions/243 ('Premium API Access') is not explained anywhere","No request or response examples are available; integration requires guesswork","The breadth of advertised endpoints (AI, finance, geo, etc.) cannot be verified from available material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/243","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/transactions/243","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 confirms pricing and payment details, but there is zero documentation on request/response schemas, no OpenAPI spec, and all doc pages render only 'Connect wallet'. The actual functionality behind 'Premium API Access' at /api/v1/transactions/243 is 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'/api/v1/transactions/243':89 '/docs':182 '/pricing':184 '/readme':186 '/request':13,28 '0.02':12,27,64,117,169 '000':112 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':134 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':128 '20':111 '300':137 '6':122 'Base network API' 'USDC API' 'accept':97 'access':95 'across':50 'address':133 'advertis':143 'ai-inference' 'ai/ml':53 'also':142 'analysi':147 'analyt':52 'api':5,20,37,76,94 'asset':126 'avail':213 'base':8,23,72,113,125 'beyond':174 'broad':42 'call':4,19 'catalog':43 'challeng':102 'classif':150 'classification' 'commit':83 'confirm':103 'connect':192 'contract':127 'convers':162 'crypto API gateway' 'crypto-quotes' 'data':51 'data-analytics' 'decim':123 'detail':199 'determin':218 'difficult':216 'document':173,208 'embed':151 'embeddings' 'enabl':36 'endpoint':49,60,87,144,222 'estim':159 'exampl':211 'exchang':154 'expect':223 'extrem':179 'feed':153 'finance-data' 'finance/web3':55 'gas':158 'generat':164 'geocod':160 'geocoding' 'howev':172 'infer':54 'infrastructur':57 'input':220 'key':77 'land':176 'limit':80 'list':91 'live':106 'low payment fee' 'lowpaymentfee.com':31 'make':214 'maximum':109 'micropayment API' 'network':9,24,73 'offer':40 'openapi':203 'output':226 'page':177,187 'paid':67 'pay':2,17,46 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':45 'payload':212 'payment':129 'per':3,18,47,65 'platform':6,21,38,141 'point':171 'post':98 'premium':93 'price':62,152,170 'prompt':194 'quot':157 'rate':79,155 'render':189 'request':48,66,99,107 'request/response':206 'requir':84 'return':228 'schema':207 'second':138 'sent':131 'sentiment':146 'sentiment-analysis' 'sinc':119 'spars':180 'spec':204 'specif':86 'summar':149 'technic':198 'text':148 'text-summarization' 'timeout':139 'token':156 'unit':114 'usd':118 'usdc':15,30,69,116,120 'usdc-base' 'use':121 'util':58 'utility-services' 'valid':161 'via':10,25 'wallet':193 'x402':11,26,35,101 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"fa56f505-01eb-4f73-a6ce-487db7f46585","listingId":"619bda93-a925-47fa-9f0c-5bf07052f5ea","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/transactions/243","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:31.176Z"}],"sources":[{"listingId":"619bda93-a925-47fa-9f0c-5bf07052f5ea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/243","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:31.176Z","lastSeenAt":"2026-04-22T19:32:15.865Z"}],"details":{"listingId":"619bda93-a925-47fa-9f0c-5bf07052f5ea","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/243 \\\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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/243"},{"claim":"Platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without API keys","Fetching real-time crypto quotes, gas estimates, and exchange rates via micropayments","Performing geocoding, validation, or data conversion with no subscription commitment","Integrating pay-as-you-go data analytics and reporting into agent workflows"],"bestFor":["Developers wanting zero-commitment, keyless API access paid in USDC","AI agents that need on-demand inference endpoints purchasable via x402","Web3-native applications needing micropayment-gated utility services"],"notFor":["Users who need detailed API documentation and well-defined schemas before integrating","High-volume production workloads where per-request pricing at $0.02 may not be cost-effective","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.044Z"},"updatedAt":"2026-04-22T19:32:15.865Z"}}