{"id":"58e24a27-a144-4627-9a0f-170f55479209","shortId":"P92Cze","kind":"x402","title":"Pay-per-call API platform on Base with USDC payments at $0.02/request via x402.","tagline":"Pay-per-call API platform on Base with USDC payments at $0.02/request via x402.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/inbox/6` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns `application/json`. The broader platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is minimal. The landing page lists available endpoints with brief labels and prices, 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 \"Connect wallet\" prompt with no additional content. Because of this, the actual functionality behind `/api/v1/inbox/6` (and what \"Premium API Access\" specifically provides) is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","micropayment API","x402 API","pay per call API","USDC API","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific function of /api/v1/inbox/6 ('Premium API Access') is undocumented and unclear","All non-root pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No request body schema or response examples are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/6","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond endpoint names and prices, and the purpose of '/api/v1/inbox/6' ('Premium API Access') is entirely opaque. Effectively a stub 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'/api/v1/inbox/6':98,224 '/pricing':202 '/readme':204 '/request':14,30 '0.02':13,29,66,125,169 '000':114 '0x8335':119 '20':113 '2913':120 '402':108 '6':129 'Base network API' 'USDC API' 'accept':133 'access':104,229 'across':52 'actual':221 'addit':143,215 'advertis':142 'ai/ml':55 'analysi':147 'analyt':54 'api':5,21,39,77,103,228 'application/json':138 'attach':87 'avail':179 'base':8,24,74,115,122 'behind':223 'brief':182 'broad':44 'broader':140 'call':4,20 'caller':85 'catalog':45 'challeng':109 'classif':150 'connect':210 'content':216 'convers':162 'data':53 'decim':130 'document':172,195 'embed':151 'enabl':38 'endpoint':51,62,97,132,144,180 'equal':124 'estim':159 'exampl':199 'exchang':154 'feed':153 'finance/web3':57 'function':222 'gas':158 'generat':164 'geocod':160 'given':126 'header':91 'infer':56 'infrastructur':59 'json-api' 'key':78 'label':183 'land':176 'limit':80 'list':100,178 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'micropayment API' 'minim':174 'network':75 'no-api-key' 'no-rate-limit' 'offer':42 'openapi':190 'page':177,205 'pay':2,18,48 'pay per call API' 'pay-per-cal':1,17 'pay-per-request':47 'payabl':69 'payment':11,27,90 'per':3,19,49,67 'platform':6,22,40,141 'point':171 'post':134 'post-method' 'premium':102,227 'price':64,152,170,185 'prompt':212 'provid':231 'quot':157 'rate':79,155 'request':50,68,94,110,135 'request/response':193 'requir':84 'resolv':207 'return':106,137 'schema':194 'sentiment':146 'simpli':86 'spec':191 'specif':96,230 'subscript':82 'summar':149 'text':148 'token':156 'unclear':233 'unit':116 'usag':198 'usdc':10,26,71,118,127 'usdc-base' 'util':60 'valid':161 'via':15,31 'wallet':211 'x402':16,32,37,89 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"30af8441-2039-4ab5-98b6-66462d1f42c6","listingId":"58e24a27-a144-4627-9a0f-170f55479209","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.487Z"}],"sources":[{"listingId":"58e24a27-a144-4627-9a0f-170f55479209","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.487Z","lastSeenAt":"2026-04-22T04:02:45.895Z"}],"details":{"listingId":"58e24a27-a144-4627-9a0f-170f55479209","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/6 \\\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 Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/6 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/6"},{"claim":"The platform lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-call API services without subscriptions or API keys","Integrating USDC-based micropayments into automated agent workflows","Consuming data, AI, finance, or utility endpoints on a per-request basis"],"bestFor":["Agents or developers wanting zero-commitment, pay-as-you-go API access","x402-compatible clients on the Base network","Low-volume or sporadic API consumers who want to avoid subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.311Z"},"updatedAt":"2026-04-22T04:02:45.895Z"}}