{"id":"b7f70086-b483-4af9-8a0a-934fd38addf5","shortId":"x6UFFX","kind":"x402","title":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","tagline":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","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/48` 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, accounts, 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.\n\nHowever, the specific functionality behind `/api/v1/keys/48` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The endpoint is live and returns a valid x402 challenge, but what data or service it actually returns upon successful payment is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available for what /api/v1/keys/48 actually returns upon successful payment","No OpenAPI or schema definition found","All non-homepage crawled pages returned only 'Connect wallet' with no useful content","The endpoint label 'Premium API Access' is generic and does not describe functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/48","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/48","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 zero documentation on what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the crawled pages beyond the homepage are empty wallet-connect stubs. The specific purpose of /api/v1/keys/48 is unknown beyond its 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'/request':12,29,150 '0.02':11,28,71,149 '000':75 '20':74 '6':81 'Base network API' 'USDC API access' 'accept':50 'access':6,23,66,167 'account':86 'actual':201 'advertis':91,105 'ai':116 'analysi':120 'analyt':110 'api':5,22,42,65,84,107,166 'attach':94 'avail':180 'base':8,25,55,76 'behind':157 'beyond':162 'broader':103 'call':4,21,73 'caller':92 'categori':108 'challeng':194 'classif':123 'convers':140 'cost':68 'crawl':183 'data':109,113,197 'decim':82 'detail':178 'document':161,179 'embed':124 'endpoint':59,143,186 'estim':134 'exampl':175 'exchang':129 'export':114 'feed':128 'financ':125 'function':156 'gas':133 'generat':141 'geocod':138 'header':98 'howev':153 'infrastructur':136 'insight':115 'json-response' 'key':16,33,85 'label':164 'learn':118 'limit':89 'list':62,145 'live':188 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':117 'metric':111 'micropayment API' 'multipl':106 'network':56 'no-api-key' 'openapi':171 'page':184 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,97,205 'per':3,20,40,72 'platform':43,104 'point':152 'premium':64,165 'price':127,151 'protocol':48 'quot':132 'rate':88,130 'report':112 'request':41,101 'request/response':174 'requir':17,34 'return':190,202 'schema':172 'sentiment':119 'servic':199 'simpli':93 'specif':58,155 'success':204 'summar':122 'text':121 'token':131 'unclear':207 'unit':77 'upon':203 'usdc':14,31,51,79 'usdc-base' 'use':45 'util':137 'valid':139,192 'via':9,26 'web3':126 'x402':10,27,47,96,193 'x402 API' 'x402-payment'","prices":[{"id":"b159aff0-cf70-4938-8782-94e73d89be31","listingId":"b7f70086-b483-4af9-8a0a-934fd38addf5","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.672Z"}],"sources":[{"listingId":"b7f70086-b483-4af9-8a0a-934fd38addf5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.672Z","lastSeenAt":"2026-04-22T05:32:12.555Z"}],"details":{"listingId":"b7f70086-b483-4af9-8a0a-934fd38addf5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/48 \\\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":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/48"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/48"},{"claim":"Platform lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Prototyping x402 payment integrations"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone needing to understand exact response schemas before calling"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.395Z"},"updatedAt":"2026-04-22T05:32:12.555Z"}}