{"id":"fa0fbc50-d67d-46d8-846e-83004699990a","shortId":"ZuaZZF","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that hosts a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no subscriptions, no rate limits.\n\nThe specific endpoint at `/api/v1/inbox/84` 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 per request (USDC uses 6 decimals). The platform's landing page confirms a uniform $0.02/request pricing across all its endpoints.\n\nThe broader platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during the crawl — the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. The exact functionality of the `/api/v1/inbox/84` endpoint specifically is unclear from available materials.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","post-endpoint","pay-per-use"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific function of /api/v1/inbox/84 ('Premium API Access') is not described anywhere in the crawled material","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No example request or response payloads are available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/84","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no example requests or responses, and the purpose of '/api/v1/inbox/84' specifically is undocumented. The crawled pages beyond the landing page returned no useful 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'/api/v1/inbox/84':93,213 '/pricing':193 '/readme':195 '/request':19,38,140 '0.02':18,37,124,139 '000':113 '0x8335':118 '20':112 '2913':119 '6':129 'accept':101 'access':99 'across':142 'advertis':107,149 'ai':12,31 'ai/ml':56 'analysi':158 'analyt':55 'api':5,24,45,82,98 'avail':219 'base':8,27,75,114,121 'base network api' 'broader':147 'call':4,23 'challeng':106 'classif':161 'collect':50 'confirm':136 'connect':201 'content':207 'convers':173 'cost':110 'crawl':190 'data':11,30,54,59,154 'decim':130 'detail':180 'document':181 'embed':162 'enabl':44 'endpoint':16,35,52,65,91,145,150,214 'equal':123 'estim':170 'exact':209 'exampl':183 'exchang':165 'export':155 'feed':164 'financ':13,32 'finance/web3':58 'found':187 'function':210 'gas':169 'general':61 'generat':175 'geocod':171 'host':48 'howev':176 'infer':57 'insight':156 'key':83 'land':134 'limit':88 'list':95 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'materi':220 'maximum':109 'metric':152 'micropayment api' 'network':76 'no-api-key' 'offer':10,29 'openapi':178 'page':135,196 'paid':67 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-use' 'payload':185 'per':3,22,69,125 'per-request':68 'per-request-billing' 'platform':6,25,46,132,148 'post':102 'post-endpoint' 'premium':97 'price':141,163 'prompt':203 'protocol':80 'quot':168 'rate':87,166 'report':153 'request':70,103,126 'request/response':184 'return':198 'schema':179 'sentiment':157 'servic':63 'span':53 'specif':90,215 'subscript':85 'substant':206 'summar':160 'text':159 'token':167 'unclear':217 'uniform':138 'unit':115 'usdc':9,28,72,117,127 'usdc api' 'usdc-base' 'use':71,128 'util':15,34,62 'valid':172 'via':77 'wallet':202 'x402':43,79,105 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d4d8f031-ad7d-4bf2-bfa9-eeab0d019b12","listingId":"fa0fbc50-d67d-46d8-846e-83004699990a","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.252Z"}],"sources":[{"listingId":"fa0fbc50-d67d-46d8-846e-83004699990a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.252Z","lastSeenAt":"2026-04-22T04:02:45.645Z"}],"details":{"listingId":"fa0fbc50-d67d-46d8-846e-83004699990a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/84 \\\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":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/84"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand access to various utility or data endpoints without managing API keys","Paying for individual API calls with USDC on Base without subscriptions","Integrating low-cost per-request services into automated workflows"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with crypto wallets that can settle x402 payments on Base","Prototyping and low-volume usage where $0.02/call is economical"],"notFor":["High-volume production workloads where per-call pricing adds up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.584Z"},"updatedAt":"2026-04-22T04:02:45.645Z"}}