{"id":"57e2773a-1a7c-4dc5-bfa3-da763873c244","shortId":"fxwkJK","kind":"x402","title":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","tagline":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/inbox/121` is listed as \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys, rate limits, or subscriptions are required — each call is paid individually via an X-PAYMENT header.\n\nThe broader platform advertises several API categories including 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 $0.02 per request and settle payments in USDC on the Base L2 network.\n\nHowever, the specific functionality of the `/api/v1/inbox/121` endpoint is unclear. The description is simply \"Premium API Access\" with no further documentation, input schema, or output schema available. The crawled docs pages (/api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no additional content. Without knowing what this endpoint actually returns, callers should treat it as an opaque service until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available for the specific endpoint /api/v1/inbox/121 — its purpose and expected input/output are unknown","All docs pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No OpenAPI spec, no input schema, no output schema, and no example responses available","The endpoint path 'inbox/121' suggests a resource-specific route but its semantics are undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/121","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/121","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what /api/v1/inbox/121 actually does, no input/output schema, no examples, and the docs pages are empty. The listing is essentially a stub with only the x402 challenge metadata to go 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'/api/v1/inbox/121':56,167 '/pricing':193 '/readme':194 '/request':11,26 '0.02':10,25,67,81,148 '000':73 '20':72 '6':79 'Base network API' 'USDC API' 'accept':46 'access':62,177 'actual':211 'addit':204 'advertis':105 'ai':117 'analysi':121 'analyt':111 'api':5,20,38,61,83,107,176 'avail':187 'base':8,23,51,74,158 'base-network' 'broader':103 'call':4,19,92 'caller':213 'categori':108 'classif':124 'connect':199 'content':205 'convers':141 'cost':64 'crawl':189 'data':110,114 'decim':80 'descript':172 'doc':190 'document':181,223 'embed':125 'endpoint':55,144,168,210 'estim':135 'exchang':130 'export':115 'feed':129 'financ':126 'function':164 'gas':134 'generat':142 'geocod':139 'header':101 'howev':161 'includ':109 'individu':95 'infrastructur':137 'input':182 'insight':116 'key':84 'know':207 'l2':159 'learn':119 'limit':86 'list':58,146 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':118 'maxamountrequir':70 'metric':112 'micropayment API' 'network':9,24,52,160 'no-api-key' 'opaqu':219 'output':185 'page':191 'paid':94 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':34 'payment':15,30,48,100,153 'per':3,18,36,68,149 'platform':6,21,39,104 'post-endpoint' 'premium':60,175 'premium API access' 'price':128 'prompt':201 'protocol':44 'quot':133 'rate':85,131 'report':113 'request':37,69,150 'requir':90 'return':196,212 'schema':183,186 'sentiment':120 'servic':220 'settl':152 'sever':106 'simpli':174 'specif':54,163 'subscript':88 'summar':123 'surfac':224 'text':122 'token':132 'treat':215 'unclear':170 'unit':75 'usdc':14,29,47,77,155 'usdc-settlement' 'use':41 'util':138 'valid':140 'via':12,27,96 'wallet':200 'web3':127 'without':206 'x':99 'x-payment':98 'x402':13,28,43 'x402 API' 'x402-payment'","prices":[{"id":"5bc7ef83-86df-4c64-8f9e-c4a99821ec9a","listingId":"57e2773a-1a7c-4dc5-bfa3-da763873c244","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/121","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.309Z"}],"sources":[{"listingId":"57e2773a-1a7c-4dc5-bfa3-da763873c244","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/121","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.309Z","lastSeenAt":"2026-04-22T15:32:48.861Z"}],"details":{"listingId":"57e2773a-1a7c-4dc5-bfa3-da763873c244","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/121 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/121"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/121"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-request API without needing API keys or subscriptions","Agent-driven workflows that settle per-call costs in USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment-gated APIs","Agents that can settle USDC payments on Base network","Low-volume, on-demand API consumption without subscription overhead"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","High-volume batch processing where per-request fees add up quickly","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.274Z"},"updatedAt":"2026-04-22T15:32:48.861Z"}}