{"id":"609dc754-a099-4669-b7a7-13245a3ccfd8","shortId":"8bfvKC","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, 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 being listed here is `/api/v1/inbox/85`, described by the provider as \"Premium API Access.\" Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.\n\nDocumentation is minimal — the crawled pages beyond the landing page returned only \"Connect wallet\" prompts, and no OpenAPI spec, README, or detailed endpoint documentation was found. The exact functionality of `/api/v1/inbox/85` is unclear; it may be a messaging or notification inbox endpoint, but this is speculative. The platform appears live (402 challenge returned correctly, root page returns 200), but the lack of schemas, example payloads, and endpoint-specific docs limits confidence in what this particular route does.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-platform","misc"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","inbox api"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact purpose and expected request/response format of /api/v1/inbox/85 is unknown","All non-landing crawled pages returned only 'Connect wallet' with no useful content","Endpoint name 'inbox/85' suggests a resource-specific route; unclear if it is a general-purpose API or a single-resource accessor"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/85","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/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (valid 402 challenge returned) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation for this specific endpoint, no input/output schema, and no examples. The purpose of '/api/v1/inbox/85' is ambiguous — the provider description is just 'Premium API Access' with no further 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'/request':19,38 '0.02':18,37,94,144 '000':133 '0x8335':138 '20':132 '200':240 '2913':139 '300':159 '402':233 '6':148 'access':123,170 'across':54 'advertis':127,169 'ai':12,31,63 'amount':130 'analysi':67 'analyt':58 'api':5,24,45,122,163 'appear':231 'base':8,27,102,134,141 'base network api' 'beyond':189 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':126,234 'classif':70 'confid':254 'connect':195 'convers':87 'correct':236 'crawl':187 'data':11,30,57 'decim':149 'describ':116 'detail':204 'doc':252 'document':183,206 'embed':71 'enabl':44 'endpoint':16,35,53,90,110,205,224,250 'endpoint-specif':249 'equal':143 'estim':81 'exact':155,210 'exampl':246 'exchang':76 'export':61 'expos':48 'feed':75 'financ':13,32,72 'found':208 'four':55 'function':211 'gas':80 'generat':88 'geocod':85 'given':145 'header':182 'inbox':223 'inbox api' 'includ':176 'infrastructur':83 'insight':62 'instant':172 'key':164 'lack':243 'land':191 'learn':65 'limit':167,253 'list':112 'live':232 'low payment fee' 'lowpaymentfee.com':39 'machin':64 'made':152 'maximum':129 'may':217 'messag':220 'metric':59 'micropayment api' 'minim':185 'network':103 'no-api-key' 'no-rate-limit' 'notif':222 'offer':10,29 'openapi':200 'page':188,192,238 'particular':258 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payload':247 'payment':150,174,181 'per':3,22,95 'platform':6,25,46,230 'post-endpoint' 'premium':121 'price':74,92 'prompt':197 'protocol':107 'provid':119 'quot':79 'rate':77,166 'readm':202 'report':60 'request':96 'return':193,235,239 'root':237 'rout':259 'schema':245 'scheme':156 'second':160 'sentiment':66 'settl':97 'spec':201 'specif':109,251 'specul':228 'summar':69 'text':68 'timeout':161 'token':78 'unclear':215 'unit':135 'usdc':9,28,99,137,146 'usdc api' 'usdc-base' 'util':15,34,84 'valid':86 'via':104,153 'wallet':196 'web3':73 'x':180 'x-payment':179 'x402':43,106,125 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"01dc1aa5-32e2-40c3-8314-d2349085b653","listingId":"609dc754-a099-4669-b7a7-13245a3ccfd8","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/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.557Z"}],"sources":[{"listingId":"609dc754-a099-4669-b7a7-13245a3ccfd8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/85","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.557Z","lastSeenAt":"2026-04-22T04:02:45.977Z"}],"details":{"listingId":"609dc754-a099-4669-b7a7-13245a3ccfd8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/85 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/inbox/85"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium inbox or messaging endpoint with per-request USDC micropayments","Integrating pay-per-call APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand API access settled on Base"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing well-documented, schema-defined endpoints with clear input/output contracts","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.213Z"},"updatedAt":"2026-04-22T04:02:45.977Z"}}