{"id":"6d29d743-65ad-453d-8099-f48b133093de","shortId":"ZWpvrN","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/43` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint categories: 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nThe specific functionality behind `/api/v1/inbox/43` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, /api) all resolve to a minimal \"Connect wallet\" prompt with no additional detail. The endpoint is confirmed live — it returns a proper 402 challenge — but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available for the specific endpoint /api/v1/inbox/43 — its actual functionality is unknown","No OpenAPI or JSON schema describing request parameters or response format","Crawled docs pages (/pricing, /README, /api) all returned only a 'Connect wallet' prompt with no content","The endpoint name 'Premium API Access' is generic and does not describe what the endpoint does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/43","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/inbox/43 actually does beyond the generic label 'Premium API Access.' The crawled pages are nearly empty. This is effectively a stub 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'/api/v1/inbox/43':69,176 '/request':19,38,169 '0.02':18,37,80,168 '000':84 '20':83 '402':223 '402 payment API' '6':90 'Base network API' 'USDC API' 'access':75,185 'account':102 'actual':228 'addit':212 'advertis':124 'ai':12,31,135 'ai-inference' 'analysi':139 'analyt':129 'api':5,24,45,74,100,184 'attach':110 'base':8,27,63,85 'base-network' 'behind':175 'beyond':180 'broad':50 'call':4,23,82 'caller':108 'catalog':51 'categori':127 'challeng':224 'classif':142 'confirm':217 'connect':207 'convers':159 'cost':77 'cover':10,29 'crawl':196 'data':11,30,128,132 'data-analytics' 'decim':91 'detail':213 'doc':197 'document':179 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,162,215 'estim':153 'exampl':193 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'finance-data' 'four':125 'function':174 'gas':152 'generat':160 'geocod':157 'handl':94 'header':115 'infrastructur':155 'insight':134 'key':101 'label':182 'learn':137 'limit':105 'list':71,164 'live':218 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':136 'metric':130 'micropayment API' 'minim':206 'network':64 'no-api-key' 'offer':48 'openapi':189 'page':198 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,114,119,232 'per':3,22,55,81 'platform':6,25,46,123 'point':171 'premium':73,183 'price':146,170,199 'prompt':209 'proof':120 'proper':222 'protocol':98 'quot':151 'rate':104,149 'readm':200 'report':131 'request':56 'request/response':192 'requir':107 'resolv':203 'return':220,229 'schema':190 'sentiment':138 'settl':58 'simpli':109 'specif':66,173 'success':231 'summar':141 'text':140 'token':150 'unit':86 'unknown':234 'upon':230 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,156 'utility-services' 'valid':118,158 'via':95 'wallet':208 'web3':145 'wider':122 'x':113 'x-payment':112 'x402':43,97 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"3fb5a2fb-db60-4fd9-b259-ec59efecbf9c","listingId":"6d29d743-65ad-453d-8099-f48b133093de","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.918Z"}],"sources":[{"listingId":"6d29d743-65ad-453d-8099-f48b133093de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.918Z","lastSeenAt":"2026-04-22T01:02:16.705Z"}],"details":{"listingId":"6d29d743-65ad-453d-8099-f48b133093de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/43 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/43"},{"claim":"All listed 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 in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/43"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls from autonomous agents using x402 payment headers","Integrating pay-as-you-go data, AI, or finance endpoints into workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Use cases requiring USDC micropayments on Base for API consumption","Quick prototyping where traditional API key management is undesirable"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.132Z"},"updatedAt":"2026-04-22T01:02:16.705Z"}}