{"id":"bd037820-0a80-479b-bbc6-decf3e088c5a","shortId":"fx5vAa","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/70` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers simply attach an x402 payment header to each request.\n\nThe wider platform advertises four endpoint families: 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 listed at the same $0.02/request price point.\n\nNote that the specific `/api/v1/inbox/70` endpoint does not clearly map to any of the documented API categories, and no schema or documentation is available for its request or response format. The crawled docs pages (/api, /pricing, /README) returned only a \"Connect wallet\" prompt with no additional technical detail. Without an OpenAPI spec, example payloads, or detailed documentation, the actual functionality behind this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","data","llm","finance","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","pay-per-request endpoint"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The path /api/v1/inbox/70 does not correspond to any documented API category on the site","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","Actual request body format and response structure are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/70","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific /api/v1/inbox/70 path is not described in the catalog. The actual functionality is 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'/api/v1/inbox/70':69,164 '/pricing':195 '/readme':196 '/request':19,38,157 '0.02':18,37,80,156 '000':84 '20':83 '6':90 'Base network API' 'USDC pay-per-call' 'access':75 'actual':218 'addit':205 'advertis':99,113 'ai':12,31,123 'analysi':127 'analyt':118 'api':5,24,45,74,93,175 'attach':102 'avail':183 'base':8,27,63,85 'base-network' 'behind':220 'broad':50 'call':4,23,82 'caller':100 'catalog':51 'categori':176 'classif':130 'clear':168 'connect':200 'convers':147 'cost':77 'cover':10,29 'crawl':191 'data':11,30,117 'decim':91 'detail':207,215 'doc':192 'document':174,181,216 'embed':131 'enabl':44 'endpoint':16,35,57,67,115,150,165,222 'estim':141 'exampl':212 'exchang':136 'export':121 'famili':116 'feed':135 'financ':13,32,132 'format':189 'four':114 'function':219 'gas':140 'generat':148 'geocod':145 'header':106 'infrastructur':143 'insight':122 'key':94 'learn':125 'limit':97 'list':71,152 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':124 'map':169 'metric':119 'micropayment API' 'network':64 'no-api-key' 'note':160 'offer':48 'openapi':210 'page':193 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-request':53 'pay-per-request endpoint' 'payload':213 'payment':105 'per':3,22,55,81 'platform':6,25,46,112 'point':159 'post-endpoint' 'premium':73 'price':134,158 'prompt':202 'quot':139 'rate':96,137 'remain':223 'report':120 'request':56,109,186 'respons':188 'return':197 'schema':179 'sentiment':126 'settl':58 'simpli':101 'spec':211 'specif':66,163 'summar':129 'technic':206 'text':128 'token':138 'unclear':224 'unit':86 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,144 'valid':146 'wallet':201 'web3':133 'wider':111 'without':208 'x402':43,104 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"ab25cf82-0e3a-4620-b616-8995ebba97cc","listingId":"bd037820-0a80-479b-bbc6-decf3e088c5a","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.467Z"}],"sources":[{"listingId":"bd037820-0a80-479b-bbc6-decf3e088c5a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/70","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.467Z","lastSeenAt":"2026-04-22T04:02:45.882Z"}],"details":{"listingId":"bd037820-0a80-479b-bbc6-decf3e088c5a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/70 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/70"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/70"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Four endpoint categories are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics or reports on a per-call basis without subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-request billing","Fetching real-time crypto prices, gas estimates, or exchange rates","Using utility services like geocoding or data validation with instant USDC micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agent-based workflows that settle payments programmatically via x402","Users who prefer crypto-native billing without API key management"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who need well-documented request/response schemas before integrating","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.33Z"},"updatedAt":"2026-04-22T04:02:45.882Z"}}