{"id":"67a9f96e-6500-4bcb-8d3f-f92ef5b1847b","shortId":"knM83W","kind":"x402","title":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","tagline":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/inbox/26` is listed as \"Premium API Access\" and accepts POST requests with a maximum cost of 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises multiple API 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 listed at the same $0.02/request price point. However, the specific endpoint being listed here (`/api/v1/inbox/26`) is labeled generically as \"Premium API Access\" and does not appear in the site's public API catalog, so its exact functionality is unclear.\n\nPayments settle on the Base L2 network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge uses the \"exact\" scheme with a 300-second timeout. The endpoint is live and returning a proper 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["The endpoint /api/v1/inbox/26 does not appear in the site's public API catalog — its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema is available.","Documentation pages (/api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'.","The platform's advertised capabilities (AI, analytics, finance, etc.) cannot be verified for this specific endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/26","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/26","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 documentation, no OpenAPI schema, no request/response examples, and the specific endpoint's functionality ('Premium API Access' at /api/v1/inbox/26) is not described anywhere on the site. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. This is effectively a stub 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'/request':11,26,153 '0.02':10,25,79,152 '000':73 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':198 '20':72 '300':208 '402':219 '402 payment API' '6':85 'Base network API' 'USDC API' 'accept':46,64 'access':62,170 'advertis':94,108 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,61,88,110,169,180 'appear':174 'attach':97 'base':8,23,51,74,192 'broader':106 'call':4,19,81 'caller':95 'catalog':181 'categori':111 'challeng':201,220 'classif':126 'contract':197 'convers':143 'cost':70 'data':112,116 'decim':86 'embed':127 'endpoint':55,146,159,212 'estim':137 'exact':184,204 'exchang':132 'export':117 'feed':131 'financ':128 'function':185 'gas':136 'generat':144 'generic':166 'geocod':141 'header':101 'howev':156 'i.e':78 'infrastructur':139 'insight':118 'key':89 'l2':193 'label':165 'learn':121 'limit':92 'list':58,148,161 'live':214 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'maximum':69 'metric':114 'micropayment API' 'multipl':109 'network':9,24,52,194 'no-api-key' 'no-rate-limit' 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':15,30,48,100,188 'per':3,18,36,80 'platform':6,21,39,107 'point':155 'post':65 'post-endpoint' 'premium':60,168 'price':130,154 'proper':218 'protocol':44 'public':179 'quot':135 'rate':91,133 'report':115 'request':37,66,104 'return':216 'scheme':205 'second':209 'sentiment':122 'settl':189 'simpli':96 'sinc':82 'site':177 'specif':54,158 'summar':125 'text':124 'timeout':210 'token':134 'unclear':187 'unit':75 'usdc':14,29,47,77,83,196 'usdc-base' 'use':41,84,195,202 'util':140 'valid':142 'via':12,27 'web3':129 'x402':13,28,43,99,200 'x402 API' 'x402-payment'","prices":[{"id":"ae10af4a-6b09-40b9-90bf-46831a215978","listingId":"67a9f96e-6500-4bcb-8d3f-f92ef5b1847b","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.554Z"}],"sources":[{"listingId":"67a9f96e-6500-4bcb-8d3f-f92ef5b1847b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.554Z","lastSeenAt":"2026-04-22T05:32:22.569Z"}],"details":{"listingId":"67a9f96e-6500-4bcb-8d3f-f92ef5b1847b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/26 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/26"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/26"},{"claim":"All listed APIs are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API access","Testing x402 protocol integrations on Base network"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.213Z"},"updatedAt":"2026-04-22T05:32:22.569Z"}}