{"id":"dc9407e3-b0ec-43be-b392-addf9d7ef28c","shortId":"vYaCWU","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 exposes a broad catalog 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 protocol.\n\nThe specific endpoint `/api/v1/inbox/148` 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 no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation is minimal — the site's /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The purpose of the `/api/v1/inbox/148` endpoint specifically is unclear; it does not map to any of the named endpoints on the landing page, so its actual functionality cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","no-api-key"],"categories":["api-platform","x402"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The endpoint path /api/v1/inbox/148 does not match any of the named endpoints listed on the landing page; its actual functionality is unclear.","No OpenAPI spec, request schema, or response schema is available.","Documentation pages (/api, /pricing, /README) all resolve to a wallet-connect prompt with no content.","No usage examples or error documentation found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/148","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/148","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific /api/v1/inbox/148 path does not correspond to any named endpoint on the site. The actual functionality of this endpoint is 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'/api/v1/inbox/148':112,209 '/pricing':175 '/readme':177 '/request':19,38 '0.02':18,37,95,139 '000':128 '0x8335':133 '20':127 '2913':134 '402':122 '402 payment api' '6':137 'accept':162 'access':118 'across':54 'actual':230 'ai':12,31,64 'analysi':68 'analyt':58 'api':5,24,45,117,150 'application/json':167 'avail':204,236 'base':8,27,103,129,136 'base network api' 'broad':50 'call':4,23 'cannot':232 'catalog':51 'categori':56 'challeng':123 'classif':71 'commit':158 'confirm':234 'connect':185 'content':190 'convers':88 'data':11,30,57,61 'decim':138 'document':168,199 'embed':72 'enabl':44 'endpoint':16,35,53,91,111,161,210,223 'estim':82 'exact':146 'exampl':203 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'four':55 'function':231 'gas':81 'generat':89 'geocod':86 'http':163 'http-post' 'infrastructur':84 'insight':63 'json-response' 'key':151 'land':226 'learn':66 'limit':154 'list':114 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':142 'map':217 'materi':237 'metric':59 'micropayment api' 'minim':170 'name':222 'network':104 'no-api-key' 'offer':10,29 'openapi':194 'page':178,227 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':140 'per':3,22,96 'platform':6,25,46 'post':164 'premium':116 'price':75,93 'prompt':186 'protocol':108 'purpos':206 'quot':80 'rate':78,153 'report':60 'request':97,124 'request/response':197 'requir':159 'resolv':180 'return':120,166 'schema':198 'scheme':147 'sentiment':67 'settl':98 'site':172 'spec':195 'specif':110,211 'summar':70 'text':69 'token':79 'unclear':213 'unit':130 'upfront':157 'usag':202 'usdc':9,28,100,132 'usdc api' 'usdc-base' 'util':15,34,85 'valid':87 'via':105,143 'wallet':184 'wallet-connect':183 'web3':74 'x402':43,107,145 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"29578800-c74d-44f8-8f9f-2a2b5f923e56","listingId":"dc9407e3-b0ec-43be-b392-addf9d7ef28c","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/148","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.515Z"}],"sources":[{"listingId":"dc9407e3-b0ec-43be-b392-addf9d7ef28c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/148","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.515Z","lastSeenAt":"2026-04-22T13:32:22.431Z"}],"details":{"listingId":"dc9407e3-b0ec-43be-b392-addf9d7ef28c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/148 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/148 requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02.","source_url":"https://lowpaymentfee.com/api/v1/inbox/148"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to data analytics, AI inference, finance, or utility endpoints without API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Prototyping integrations where per-call pricing avoids subscription overhead"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with Base USDC wallets needing low-friction endpoint access","Projects that prefer crypto-native micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where $0.02/request adds up quickly","Teams that require SLA guarantees or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.872Z"},"updatedAt":"2026-04-22T13:32:22.431Z"}}