{"id":"fa7b2843-eff3-47bb-9b67-d08162956f1e","shortId":"Bg5dcn","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 `/api/v1/inbox/33` is listed as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, no subscriptions, no rate limits. Callers attach an X-PAYMENT header with a signed payment to access the resource.\n\nThe wider 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 endpoints are listed at the same $0.02 per request price point.\n\nNotably, the specific `/api/v1/inbox/33` endpoint does not clearly map to any of the named API categories on the landing page. Its purpose beyond the generic \"Premium API Access\" label is unknown. No OpenAPI schema, request/response examples, or detailed documentation were found during the crawl — the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services","post-method"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The /api/v1/inbox/33 endpoint does not correspond to any named API on the landing page; its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema is available.","Documentation pages (/api, /pricing, /README) returned no useful content — only a 'Connect wallet' prompt.","The platform lists many endpoint categories but none have been individually verified beyond the landing page descriptions."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/33","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/33","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 request/response examples, and no documentation beyond a landing page listing. The specific /inbox/33 endpoint's purpose is entirely opaque. Most detail pages returned only 'Connect wallet' with no 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'/api/v1/inbox/33':68,176 '/pricing':219 '/readme':221 '/request':19,38 '0.02':18,37,79,168 '000':83 '20':82 '402 payment api' '6':89 'access':74,118,200 'advertis':124 'ai':12,31,135 'ai-inference' 'analysi':139 'analyt':129 'api':5,24,45,73,99,187,199 'attach':107 'base':8,27,63,84 'base network api' 'beyond':195 'broad':50 'call':4,23 'caller':106 'catalog':51 'categori':127,188 'classif':142 'clear':180 'connect':227 'content':233 'convers':159 'cost':76 'crawl':216 'data':11,30,128,132 'data-analytics' 'decim':90 'detail':210 'document':211 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,162,177 'estim':153 'exampl':208 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'finance-data' 'found':213 'four':125 'gas':152 'generat':160 'generic':197 'geocod':157 'handl':93 'header':112 'infrastructur':155 'insight':134 'key':100 'label':201 'land':191 'learn':137 'limit':105 'list':70,164 'low payment fee' 'lowpaymentfee.com':39 'machin':136 'map':181 'metric':130 'micropayment api' 'name':186 'network':64 'no-api-key' 'notabl':173 'offer':10,29 'openapi':205 'page':192,222 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':91,111,116 'per':3,22,55,80,169 'platform':6,25,46,123 'point':172 'post-method' 'premium':72,198 'price':146,171 'prompt':229 'protocol':97 'provid':48 'purpos':194 'quot':151 'rate':104,149 'report':131 'request':56,81,170 'request/response':207 'resourc':120 'return':224 'schema':206 'sentiment':138 'settl':58 'sign':115 'specif':66,175 'subscript':102 'substant':232 'summar':141 'text':140 'token':150 'unit':85 'unknown':203 'usdc':9,28,60,87 'usdc api' 'usdc-base-network' 'util':15,34,156 'utility-services' 'valid':158 'via':94 'wallet':228 'web3':145 'wider':122 'x':110 'x-payment':109 'x402':43,96 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e98aaf8c-08f5-4bd4-9c03-21987402c558","listingId":"fa7b2843-eff3-47bb-9b67-d08162956f1e","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.892Z"}],"sources":[{"listingId":"fa7b2843-eff3-47bb-9b67-d08162956f1e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.892Z","lastSeenAt":"2026-04-22T10:02:57.262Z"}],"details":{"listingId":"fa7b2843-eff3-47bb-9b67-d08162956f1e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/33 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/33"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/33"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscription","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Exporting data or retrieving analytics metrics with no upfront commitment"],"bestFor":["Agents and developers who want instant, keyless API access via crypto micropayments","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","Web3-native applications already operating on the Base network with USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where per-request costs would exceed flat-rate alternatives","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.241Z"},"updatedAt":"2026-04-22T10:02:57.262Z"}}