{"id":"f868849b-7feb-4f82-a4c2-f264a3e154fa","shortId":"3gEj9r","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/169` 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 subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment on Base.\n\nThe broader 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/request pricing.\n\nImportant caveat: the `/api/v1/inbox/169` path does not clearly map to any of the named endpoints on the landing page. Its actual functionality is unknown — the description is simply \"Premium API Access\" with no further documentation, input schema, or example responses available. The platform's documentation pages (/api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. Prospective callers should test the endpoint to determine what it actually returns before relying on it in production.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["The endpoint path /api/v1/inbox/169 does not match any documented API on the landing page — its actual functionality is unknown.","No input schema, output schema, or example responses are available.","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content.","The platform lists many endpoint categories but provides no technical documentation for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/169","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/169","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the endpoint path '/api/v1/inbox/169' does not correspond to any named service on the landing page. Functionality is entirely 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'/api/v1/inbox/169':69,173 '/pricing':217 '/readme':218 '/request':19,38,168 '0.02':18,37,80,167 '000':84 '20':83 '6':90 'Base network API' 'USDC API' 'access':75,200 'account':102 'actual':190,240 'advertis':124 'ai':12,31,135 'analysi':139 'analyt':129 'api':5,24,45,74,100,199 'attach':108 'avail':210 'base':8,27,63,85,120 'base-network' 'broad':50 'broader':122 'call':4,23,82 'caller':107,231 'catalog':51 'categori':127 'caveat':171 'classif':142 'clear':177 'connect':223 'content':229 'convers':159 'cost':77 'data':11,30,128,132 'decim':91 'descript':195 'determin':237 'document':204,214 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,163,184,235 'estim':153 'exampl':208 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'four':125 'function':191 'gas':152 'generat':160 'geocod':157 'handl':94 'header':113 'import':170 'infrastructur':155 'input':205 'insight':134 'json-response' 'key':101 'land':187 'learn':137 'list':71,162 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':136 'map':178 'metric':130 'micropayment API' 'name':183 'network':64 'no-api-key' 'offer':10,29 'page':188,215 'path':174 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,112,118 'per':3,22,55,81 'platform':6,25,46,123,212 'post-method' 'premium':73,198 'premium API access' 'price':146,169 'product':247 'prompt':225 'prospect':230 'protocol':98 'provid':48 'quot':151 'rate':149 'reli':243 'report':131 'request':56 'requir':106 'respons':209 'return':220,241 'schema':206 'sentiment':138 'settl':58 'share':164 'sign':116 'simpli':197 'specif':66 'subscript':104 'substant':228 'summar':141 'test':233 'text':140 'token':150 'unit':86 'unknown':193 'usdc':9,28,60,88,117 'usdc-settlement' 'util':15,34,156 'valid':158 'via':95 'wallet':224 'web3':145 'x':111 'x-payment':110 'x402':43,97 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"642f3cc4-c2eb-41fb-85bd-e19f7aa13db1","listingId":"f868849b-7feb-4f82-a4c2-f264a3e154fa","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/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.451Z"}],"sources":[{"listingId":"f868849b-7feb-4f82-a4c2-f264a3e154fa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/169","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.451Z","lastSeenAt":"2026-04-22T04:02:45.865Z"}],"details":{"listingId":"f868849b-7feb-4f82-a4c2-f264a3e154fa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/169 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\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 x402 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/inbox/169"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Four endpoint categories are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages /api, /pricing, and /README returned only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/api"}],"useCases":["Programmatic access to paid API endpoints without account registration","Agent-driven API consumption with per-call USDC micropayments on Base","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402 protocol experimentation and integration testing","Low-volume callers who prefer per-request billing over subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume production workloads where $0.02/request adds up significantly","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.347Z"},"updatedAt":"2026-04-22T04:02:45.865Z"}}