{"id":"41894b92-2c45-44f9-87af-0927ddd449e4","shortId":"x5tcJD","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","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/keys/49` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys, rate limits, or upfront commitments are required — each request is paid individually via an X-PAYMENT header.\n\nThe broader platform advertises multiple API categories including 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/keys/49`) is labeled generically as \"Premium API Access\" and does not appear in the site's public directory of named endpoints, so its exact functionality is unclear.\n\nPayment settles on Base mainnet to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge uses the \"exact\" scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","premium API"],"warnings":["The endpoint /api/v1/keys/49 is not listed in the site's public API directory — its specific functionality is unknown.","No OpenAPI spec, request schema, or response schema is available.","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content.","Without knowing what this endpoint actually does, callers are paying $0.02 blind."],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/49","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/keys/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific function of /api/v1/keys/49 is not described anywhere on the site. It does not appear in the site's public endpoint directory, making its purpose 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'/request':13,28,152 '0.02':12,27,67,81,151 '000':73 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':196 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':200 '20':72 '300':210 '6':79 'Base network API' 'USDC API access' 'accept':46,215 'access':7,22,62,169 'address':195 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':6,21,38,61,83,108,168 'appear':173 'application/json':220 'base':9,24,51,74,192 'broader':104 'call':4,19,69 'categori':109 'challeng':203 'classif':125 'commit':89 'contract':199 'convers':142 'cost':64 'data':111,115 'decim':80 'directori':179 'embed':126 'endpoint':55,145,158,182,214 'estim':136 'exact':185,206 'exchang':131 'export':116 'feed':130 'financ':127 'function':186 'gas':135 'generat':143 'generic':165 'geocod':140 'header':102 'howev':155 'includ':110 'individu':96 'infrastructur':138 'insight':117 'json-response' 'key':84 'label':164 'learn':120 'limit':86 'list':58,147,160 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'mainnet':193 'maxamountrequir':70 'metric':113 'micropayment API' 'multipl':107 'name':181 'network':52 'no-api-key' 'paid':95 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,101,189 'per':3,18,36,68 'platform':39,105 'point':154 'post':216 'post-method' 'premium':5,20,60,167 'premium API' 'price':129,153 'protocol':44 'public':178 'quot':134 'rate':85,132 'report':114 'request':37,93,217 'requir':91 'return':219 'scheme':207 'second':211 'sentiment':121 'settl':190 'site':176 'specif':54,157 'summar':124 'text':123 'timeout':212 'token':133 'unclear':188 'unit':75 'upfront':88 'usdc':15,30,47,77,198 'usdc-base' 'use':41,197,204 'util':139 'valid':141 'via':10,25,97 'web3':128 'x':100 'x-payment':99 'x402':11,26,43,202 'x402 API' 'x402-payment'","prices":[{"id":"0bd3485b-c5c7-48bd-bebe-9bd26a99de5e","listingId":"41894b92-2c45-44f9-87af-0927ddd449e4","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/keys/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.834Z"}],"sources":[{"listingId":"41894b92-2c45-44f9-87af-0927ddd449e4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.834Z","lastSeenAt":"2026-04-22T01:02:19.263Z"}],"details":{"listingId":"41894b92-2c45-44f9-87af-0927ddd449e4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/49 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/keys/49"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/49"},{"claim":"Payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/keys/49"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Programmatic access without subscription commitments"],"bestFor":["Agents or developers wanting zero-commitment, pay-as-you-go API access","Users who prefer crypto-native payment rails over traditional API key billing","Low-volume or bursty usage patterns where per-call pricing is economical"],"notFor":["High-volume consumers who would benefit from bulk/subscription pricing","Users without access to USDC on Base network","Anyone needing detailed documentation or guaranteed SLAs — docs are minimal"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.147Z"},"updatedAt":"2026-04-22T01:02:19.263Z"}}