{"id":"bed5fbc0-c7a4-423c-9506-dacd7f9cfc5b","shortId":"LkWGLP","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 provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/88` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers pay per request via the x402 protocol's X-PAYMENT header.\n\nThe 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 listed endpoints share the same $0.02 per-request pricing. The x402 challenge confirms the endpoint is live, accepts POST requests, and settles payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.\n\nNote that the specific `/api/v1/inbox/88` endpoint's purpose is unclear — it does not correspond to any of the documented API categories on the landing page. No OpenAPI schema, request/response examples, or detailed documentation were found. The /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","misc"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The endpoint /api/v1/inbox/88 does not match any documented API path on the landing page; its actual functionality is unknown.","No OpenAPI schema, request examples, or response examples are available.","The /api, /pricing, and /README pages contain no documentation — only a 'Connect wallet' prompt.","The platform's advertised capabilities (AI, analytics, finance, etc.) could not be independently verified beyond the landing page listing."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/88","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/88","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 confirms pricing and settlement details, but the specific endpoint (/api/v1/inbox/88) has no documentation, no schema, no request/response examples, and its purpose ('Premium API Access') is vague. Supporting pages returned only 'Connect wallet' with no useful 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'/api/v1/inbox/88':69,190 '/pricing':223 '/readme':225 '/request':19,38 '0.02':18,37,80,158 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':179 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':183 '20':83 '402 payment api' '6':90 'accept':171 'access':75 'address':178 'advertis':99,115 'ai':12,31,126 'analysi':130 'analyt':120 'api':5,24,45,74,93,205 'base':8,27,63,85,185 'base network api' 'base-network' 'broad':50 'call':4,23,82 'caller':100 'catalog':51 'categori':118,206 'challeng':165 'classif':133 'confirm':166 'connect':231 'content':237 'contract':182 'convers':150 'correspond':199 'cost':77 'data':11,30,119,123 'decim':91 'detail':217 'document':204,218 'embed':134 'enabl':44 'endpoint':16,35,57,67,117,154,168,191 'estim':144 'exampl':215 'exchang':139 'export':124 'feed':138 'financ':13,32,135 'found':220 'four':116 'gas':143 'generat':151 'geocod':148 'header':112 'infrastructur':146 'insight':125 'key':94 'land':209 'learn':128 'limit':97 'list':71,153 'live':170 'low payment fee' 'lowpaymentfee.com':39 'machin':127 'metric':121 'micropayment api' 'network':64 'no-api-key' 'note':186 'offer':10,29 'openapi':212 'page':210,226 'pay':2,21,54,101 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':111,176 'per':3,22,55,81,102,160 'per-request':159 'platform':6,25,46,114 'post':172 'post-endpoint' 'premium':73 'price':137,162 'prompt':233 'protocol':107 'provid':48 'purpos':193 'quot':142 'rate':96,140 'report':122 'request':56,103,161,173 'request/response':214 'return':228 'schema':213 'sentiment':129 'settl':58,175 'share':155 'specif':66,189 'substant':236 'summar':132 'text':131 'token':141 'unclear':195 'unit':86 'usdc':9,28,60,88,181 'usdc api' 'usdc-settlement' 'use':180 'util':15,34,147 'valid':149 'via':104 'wallet':232 'web3':136 'x':110 'x-payment':109 'x402':43,106,164 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"864f6ee5-5003-4949-9579-74daf35d112d","listingId":"bed5fbc0-c7a4-423c-9506-dacd7f9cfc5b","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.190Z"}],"sources":[{"listingId":"bed5fbc0-c7a4-423c-9506-dacd7f9cfc5b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.190Z","lastSeenAt":"2026-04-22T04:02:35.028Z"}],"details":{"listingId":"bed5fbc0-c7a4-423c-9506-dacd7f9cfc5b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/88 \\\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":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base, paid to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","source_url":"https://lowpaymentfee.com/api/v1/inbox/88"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that need on-demand endpoint access settled in USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol","Agents needing keyless, pay-as-you-go API access on Base","Low-volume or sporadic API consumers who prefer per-call billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers seeking bulk pricing or subscription discounts","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.762Z"},"updatedAt":"2026-04-22T04:02:35.028Z"}}