{"id":"fe5973cb-fe30-49c9-94c7-1bfbfcf90903","shortId":"LmRBPG","kind":"x402","title":"Pay-per-call API platform on Base with $0.02 USDC requests via x402 — no keys, no rate limits.","tagline":"Pay-per-call API platform on Base with $0.02 USDC requests via x402 — no keys, no rate limits.","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/6` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). Payment is settled on-chain to a specified wallet address, with no API keys or rate limits required.\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/keys/6`) is labeled generically as \"Premium API Access\" and does not appear in the site's public API directory, so its exact functionality is unclear.\n\nThe endpoint is live and returns a valid x402 402 challenge. No OpenAPI schema, detailed documentation, or example responses were found in the crawl. The `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no additional content. Without documentation or an output schema describing what this endpoint actually returns, agents should treat this as a minimally documented endpoint with uncertain functionality.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","on-chain-settlement"],"categories":["api-platform","crypto"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","premium API access"],"warnings":["The exact functionality of /api/v1/keys/6 is unknown — it does not appear in the site's public API directory","No OpenAPI schema, documentation, or example responses are available","The /api, /pricing, and /README pages returned no useful content beyond 'Connect wallet'","The endpoint name 'Premium API Access' is generic and could mean anything"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/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/keys/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 challenge, but the specific functionality of /api/v1/keys/6 is undocumented. No OpenAPI spec, no example requests/responses, and the crawled pages beyond the homepage were empty. The endpoint name 'Premium API Access' is generic and doesn't appear in the site's listed API catalog, making its purpose 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'/api/v1/keys/6':64,167 '/pricing':218 '/readme':220 '/request':157 '0.02':10,29,82,156 '000':76 '20':75 '402':201 '6':88 'Base network API' 'USDC pay-per-call' 'accept':54 'access':70,174 'actual':243 'addit':231 'address':100 'advertis':112 'agent':245 'ai':123 'analysi':127 'analyt':117 'api':5,24,46,69,103,114,173,184 'appear':178 'base':8,27,59,77 'broader':110 'call':4,23,84 'categori':115 'chain':95 'challeng':202 'charg':72 'classif':130 'connect':226 'content':232 'convers':147 'crawl':215 'data':116,120 'decim':89 'describ':239 'detail':206 'directori':185 'document':207,234,252 'embed':131 'endpoint':63,150,163,193,242,253 'estim':141 'exact':188 'exampl':209 'exchang':136 'export':121 'feed':135 'financ':132 'found':212 'function':189,256 'gas':140 'generat':148 'generic':170 'geocod':145 'howev':160 'i.e':81 'infrastructur':143 'insight':122 'key':16,35,104 'label':169 'learn':125 'limit':19,38,107 'list':66,152,165 'live':195 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':124 'metric':118 'micropayment API' 'minim':251 'multipl':113 'network':60 'no-api-key' 'on-chain':93 'on-chain-settlement' 'openapi':204 'output':237 'page':221 'pay':2,21,43 'pay-per-cal':1,20 'pay-per-request':42 'payment':56,90 'per':3,22,44,83 'platform':6,25,47,111 'point':159 'premium':68,172 'premium API access' 'price':134,158 'prompt':228 'protocol':52 'public':183 'quot':139 'rate':18,37,106,137 'report':119 'request':12,31,45 'requir':108 'respons':210 'return':197,223,244 'schema':205,238 'sentiment':126 'settl':92 'sinc':85 'site':181 'specif':62,162 'specifi':98 'summar':129 'text':128 'token':138 'treat':247 'uncertain':255 'unclear':191 'unit':78 'usdc':11,30,55,80,86 'usdc-base' 'use':49,87 'util':144 'valid':146,199 'via':13,32 'wallet':99,227 'web3':133 'without':233 'x402':14,33,51,200 'x402 API' 'x402-payment'","prices":[{"id":"6c7c6ed5-6092-4ffb-8a1b-db5754a48430","listingId":"fe5973cb-fe30-49c9-94c7-1bfbfcf90903","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/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":"2026-04-21T18:32:23.692Z"}],"sources":[{"listingId":"fe5973cb-fe30-49c9-94c7-1bfbfcf90903","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.692Z","lastSeenAt":"2026-04-22T01:02:19.068Z"}],"details":{"listingId":"fe5973cb-fe30-49c9-94c7-1bfbfcf90903","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/6 \\\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":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/6"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/6"},{"claim":"All listed 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 platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API key registration","Agent-driven workflows that settle per-request payments in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that need keyless, on-demand API access settled in USDC","Low-cost per-request API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-throughput use cases where $0.02/request adds up significantly","Anyone needing clarity on what data this specific endpoint returns"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.51Z"},"updatedAt":"2026-04-22T01:02:19.068Z"}}