{"id":"42d00e12-c110-4094-b7b2-57e9263e165f","shortId":"sRdMTJ","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 marketplace that exposes a broad set of endpoints across four 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 priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol.\n\nThe specific endpoint `/api/v1/inbox/57` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header to each POST request.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt with no additional content. Because of this, the actual behavior and response format of the inbox/57 endpoint (and the other listed endpoints) cannot be confirmed from the crawl material alone.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/inbox/57 is undocumented","All sub-pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content","Cannot verify actual response format or functionality without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/57","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no usage examples, and no documentation beyond a landing page listing. The actual purpose of '/api/v1/inbox/57' is unclear — 'Premium API Access' is a generic label. Most detail pages return only 'Connect 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'/api/v1/inbox/57':113 '/pricing':201 '/readme':203 '/request':19,38 '0.02':18,37,95,140 '000':129 '0x8335':134 '20':128 '2913':135 '300':151 '402':123 '6':138 'access':119 'across':54 'actual':221 'addit':215 'advertis':161 'ai':12,31,64 'ai-inference' 'alon':242 'analysi':68 'analyt':58 'api':5,24,45,118,155 'attach':164 'avail':181 'bare':209 'base':8,27,103,130,137 'base network api' 'behavior':222 'broad':50 'call':4,23 'caller':162 'cannot':235 'categori':56 'challeng':124 'classif':71 'classification' 'confirm':237 'connect':210 'content':216 'convers':88 'conversion' 'crawl':240 'crypto-quotes' 'data':11,30,57,61 'data-analytics' 'decim':139 'document':174,194 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,112,182,229,234 'estim':82 'exact':147 'exampl':198 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'format':225 'four':55 'gas':81 'gas-estimates' 'generat':89 'geocod':86 'geocoding' 'header':169 'inbox/57':228 'infrastructur':84 'insight':63 'key':156 'land':178 'learn':66 'limit':159 'list':115,180,233 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':143 'marketplac':46 'materi':241 'metric':59 'micropayment api' 'minim':176 'network':104 'offer':10,29 'openapi':189 'page':179,204 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':108,141,168 'per':3,22,96 'platform':6,25 'post':172 'premium':117 'price':75,93,184 'prompt':212 'protocol':109 'quot':80 'rate':78,158 'report':60 'request':97,125,173 'request/response':192 'resolv':206 'respons':224 'return':121 'schema':193 'scheme':148 'second':152 'sentiment':67 'sentiment-analysis' 'set':51 'settl':98 'simpli':163 'spec':190 'specif':111 'summar':70 'text':69 'text-summarization' 'timeout':153 'token':79 'unit':131 'usag':197 'usdc':9,28,100,133 'usdc api' 'usdc-base' 'util':15,34,85 'valid':87 'validation' 'via':105,144 'wallet':211 'web3':74 'x':167 'x-payment':166 'x402':43,107,146 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b8a6a46c-10ec-42c3-9f7e-b936b9340d83","listingId":"42d00e12-c110-4094-b7b2-57e9263e165f","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.795Z"}],"sources":[{"listingId":"42d00e12-c110-4094-b7b2-57e9263e165f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.795Z","lastSeenAt":"2026-04-22T04:02:46.225Z"}],"details":{"listingId":"42d00e12-c110-4094-b7b2-57e9263e165f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/57 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/57","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/57"},{"claim":"Available endpoint categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates programmatically","Geocoding addresses or validating data via simple paid HTTP calls","Exporting analytics data or generating reports with per-request billing"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications already holding USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.875Z"},"updatedAt":"2026-04-22T04:02:46.225Z"}}