{"id":"d2906d3d-2cc1-4a2a-8aa2-85c7a8c11a34","shortId":"vDFNwd","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/113` 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 accounts are required; callers pay via the x402 protocol by attaching an X-PAYMENT header to each POST request.\n\nThe platform advertises four categories of APIs: 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 with no minimums, commitments, or rate limits.\n\nImportant caveat: the specific `/api/v1/inbox/113` endpoint is not explicitly described in the site's public catalog — it may be a custom or unlisted inbox-style endpoint. The x402 challenge confirms it is live and accepts POST requests returning application/json. Beyond the generic \"Premium API Access\" label, no documentation, request schema, or response schema is available for this particular path.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key"],"categories":["general","api-platform"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee"],"warnings":["The /api/v1/inbox/113 path does not appear in the site's public API catalog — its purpose is unknown.","No request or response schema is available for this endpoint.","Documentation pages (/api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'.","The endpoint's actual functionality cannot be verified from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/113","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/113","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 network, but the specific /api/v1/inbox/113 endpoint has no documentation, no request/response schema, and no examples. The endpoint name 'Premium API Access' is entirely generic. The site's other pages returned only 'Connect wallet' with no useful 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'/request':19,38 '0.02':18,37,80,162 '000':84 '20':83 '6':90 'accept':209 'access':75,219 'account':96 'advertis':118 'ai':12,31,130 'analysi':134 'analyt':124 'api':5,24,45,74,93,122,218 'application/json':213 'attach':106 'avail':229 'base':8,27,63,85 'base usdc api' 'beyond':214 'broad':50 'call':4,23,82 'caller':99 'catalog':51,189 'categori':120 'caveat':175 'challeng':203 'classif':137 'commit':170 'confirm':204 'convers':154 'cost':77 'custom':194 'data':11,30,123,127 'decim':91 'describ':183 'document':222 'embed':138 'enabl':44 'endpoint':16,35,57,67,158,179,200 'estim':148 'exchang':143 'explicit':182 'export':128 'feed':142 'financ':13,32,139 'four':119 'gas':147 'generat':155 'generic':216 'geocod':152 'header':111 'import':174 'inbox':198 'inbox-styl':197 'infrastructur':150 'insight':129 'json-api' 'key':94 'label':220 'learn':132 'limit':173 'list':71,157 'live':207 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':131 'may':191 'metric':125 'micropayment api' 'minimum':169 'network':64 'no-api-key' 'offer':10,29 'particular':232 'path':233 'pay':2,21,54,100 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':110 'per':3,22,55,81,164 'per-request':163 'platform':6,25,46,117 'post':114,210 'post-method' 'premium':73,217 'price':141,166 'protocol':104 'provid':48 'public':188 'quot':146 'rate':144,172 'report':126 'request':56,115,165,211,223 'requir':98 'respons':226 'return':212 'schema':224,227 'sentiment':133 'settl':58 'share':159 'site':186 'specif':66,177 'style':199 'summar':136 'text':135 'token':145 'unit':86 'unlist':196 'usdc':9,28,60,88 'usdc-base' 'util':15,34,151 'valid':153 'via':101 'web3':140 'x':109 'x-payment':108 'x402':43,103,202 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a0bb3158-819d-42d2-812e-bc7efe10ea9a","listingId":"d2906d3d-2cc1-4a2a-8aa2-85c7a8c11a34","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/113","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.207Z"}],"sources":[{"listingId":"d2906d3d-2cc1-4a2a-8aa2-85c7a8c11a34","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/113","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.207Z","lastSeenAt":"2026-04-22T04:02:32.801Z"}],"details":{"listingId":"d2906d3d-2cc1-4a2a-8aa2-85c7a8c11a34","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/113 \\\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 x402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/113"},{"claim":"All listed APIs 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":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/113"}],"useCases":["Accessing premium API endpoints without creating an account or managing API keys","Making one-off paid API calls from autonomous agents using x402 payment protocol","Integrating pay-as-you-go data or utility services into workflows settled on Base"],"bestFor":["Agents or developers wanting frictionless, keyless API access via crypto micropayments","Low-volume or sporadic API consumers who prefer per-call pricing over subscriptions","x402-compatible clients on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.396Z"},"updatedAt":"2026-04-22T04:02:32.801Z"}}