{"id":"38175d65-b0c6-4c67-b7b7-8b5623cb6557","shortId":"FpE8mr","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/transfers/89` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per call. Payment is made via the x402 exact scheme to the payTo address on Base. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, 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 essentially empty (pages like /docs, /pricing, and /README only show a \"Connect wallet\" prompt), so the actual functionality and response schemas of individual endpoints are not documented or verifiable from the crawl material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["infrastructure","general"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, and /README pages are empty (only show 'Connect wallet')","The specific function of /api/v1/transfers/89 is unknown; 'Premium API Access' is a generic label","No request body schema or response schema is documented or inferrable","The platform lists many endpoint categories but none can be verified from crawl content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/89","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/transfers/89","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 documentation, no OpenAPI schema, no request/response examples, and the purpose of this specific endpoint (/api/v1/transfers/89) is unclear beyond the generic label 'Premium API Access.' The docs, pricing, and README pages are all 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'/docs':190 '/pricing':191 '/readme':193 '/request':13,28 '0.02':12,27,64,117,176 '000':104 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '20':103 '6':113 'Base network API' 'USDC micropayment API' 'accept':136 'access':95 'across':50 'actual':202 'address':131 'advertis':99,145 'ai/ml':53 'analysi':154 'analyt':52 'api':5,20,37,76,94 'application/json':141 'asset':109 'base':8,23,72,105,133 'beyond':181 'broad':42 'broader':143 'call':4,19,119 'catalog':43 'categori':146 'challeng':98 'classif':157 'commit':83 'connect':197 'convers':169 'crawl':217 'crypto-paid API' 'data':51,150 'decim':114 'document':180,212 'embed':158 'empti':187 'enabl':36 'endpoint':49,60,87,135,209 'equat':115 'essenti':186 'estim':166 'exact':126 'exchang':161 'export':151 'feed':160 'finance/web3':55 'function':203 'gas':165 'generat':171 'geocod':167 'howev':179 'includ':147 'individu':208 'infer':54 'infrastructur':57 'insight':152 'json-response' 'key':77 'land':183 'like':189 'limit':80 'list':91 'lowpaymentfee' 'lowpaymentfee.com':31 'made':122 'materi':218 'maxamountrequir':101 'metric':148 'network':9,24,73 'no-api-key' 'offer':40 'page':184,188 'paid':67 'pay':2,17,46 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':45 'payment':120 'payto':130 'per':3,18,47,65,118 'platform':6,21,38,144 'point':178 'post':137 'post-method' 'premium':93 'premium API access' 'price':62,159,177 'prompt':199 'quot':164 'rate':79,162 'report':149 'request':48,66,138 'requir':84 'respons':205 'return':140 'schema':206 'scheme':127 'sentiment':153 'show':195 'specif':86 'summar':156 'text':155 'token':163 'unit':106 'usdc':15,30,69,108 'usdc-base' 'use':112 'util':58 'valid':168 'verifi':214 'via':10,25,123 'wallet':198 'x402':11,26,35,97,125 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e931c7c5-f529-4fbe-b6c6-a49949cfb015","listingId":"38175d65-b0c6-4c67-b7b7-8b5623cb6557","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/transfers/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:59.081Z"}],"sources":[{"listingId":"38175d65-b0c6-4c67-b7b7-8b5623cb6557","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:59.081Z","lastSeenAt":"2026-04-22T07:01:41.380Z"}],"details":{"listingId":"38175d65-b0c6-4c67-b7b7-8b5623cb6557","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/89 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/89"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/89"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and README pages only display 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to utility/data endpoints without managing API keys or subscriptions","Agent-driven workflows that need low-cost per-call pricing settled on-chain","Testing x402 payment flows against a live endpoint on Base"],"bestFor":["Developers wanting zero-friction, keyless API access via crypto micropayments","AI agents that can settle x402 payments autonomously on Base","Projects needing simple pay-as-you-go pricing with no minimums"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring high-throughput batch processing where per-call fees add up","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.497Z"},"updatedAt":"2026-04-22T07:01:41.380Z"}}