{"id":"7422eb1f-695b-4ced-894e-ae78e3731cef","shortId":"JGRxGj","kind":"x402","title":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. Each request costs $0.02 in USDC on the Base network, with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/transactions/106` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The platform advertises a uniform $0.02/request pricing model across all endpoints. Payment is settled on-chain via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum timeout of 300 seconds per payment challenge.\n\nThe platform's documentation pages (docs, api, pricing, README) all appear to require wallet connection and provide no additional technical detail in the crawled content. No OpenAPI schema, request/response examples, or detailed endpoint documentation were found. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["x402 api","pay-per-call api","micropayment api","USDC api access","Base network api","lowpaymentfee","crypto-paid api"],"warnings":["No documentation available — all doc pages require wallet connection and show no content","The specific functionality of /api/v1/transactions/106 is undocumented","No request or response schema provided","Platform appears to be a generic multi-endpoint gateway with minimal transparency about what each endpoint actually does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/106","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/transactions/106","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is no documentation of what the endpoint actually returns, no request/response schema, and the docs pages are all behind a wallet-connect gate. The specific purpose of '/api/v1/transactions/106' is unclear beyond the generic 'Premium API Access' 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'/request':15,32,120 '0.02':14,31,75,119 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':135 '300':143 '402':192 'Base network api' 'USDC api access' 'access':7,24,42,99 'across':123 'addit':166 'advertis':116 'ai':64 'analyt':63 'api':6,23,41,84,98,154 'appear':158 'base':9,26,80,137 'base-network' 'beyond':111 'call':4,21 'categori':60 'chain':131 'challeng':103,147,193 'commit':89 'confirm':187 'connect':162 'content':172 'contract':134 'cost':74 'crawl':171 'crypto-paid api' 'data':62 'detail':168,179 'doc':153 'document':110,151,181 'endpoint':36,53,93,125,180,185 'exact':106 'exampl':177 'financ':67 'found':183 'function':107 'includ':61 'infrastructur':70 'key':85 'label':96,113 'learn':66 'limit':87 'live':188 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':65 'mani':52 'maximum':140 'micropayment api' 'model':122 'network':81 'no-api-key' 'no-rate-limit' 'offer':54 'on-chain':129 'one':50 'openapi':174 'page':152 'pay':2,19 'pay-per-cal':1,18 'pay-per-call api' 'pay-per-request' 'payment':46,126,146 'per':3,20,145 'platform':57,115,149 'premium':5,22,40,97 'price':121,155 'protocol':12,29,47 'provid':39,164 'rate':86 'readm':156 'request':73 'request/response':176 'requir':90,160 'respons':194 'schema':175 'second':144 'settl':128 'span':59 'specif':92 'technic':167 'timeout':141 'uniform':118 'usdc':17,34,77,133 'usdc-settlement' 'util':71 'valid':191 'via':10,27,43,132,189 'wallet':161 'web3':68 'x402':11,28,45,102 'x402 api' 'x402-payment'","prices":[{"id":"1eaef1d6-d657-43b1-85d8-d3362236c784","listingId":"7422eb1f-695b-4ced-894e-ae78e3731cef","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/transactions/106","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:23.163Z"}],"sources":[{"listingId":"7422eb1f-695b-4ced-894e-ae78e3731cef","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/106","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:23.163Z","lastSeenAt":"2026-04-22T07:31:47.341Z"}],"details":{"listingId":"7422eb1f-695b-4ced-894e-ae78e3731cef","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/106 \\\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 402 challenge with USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/106"},{"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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/106"}],"useCases":["Accessing premium API data without subscription or API key management","Making one-off paid API calls settled in USDC on Base","Agent-driven API consumption with per-request crypto payments"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer on-chain USDC micropayments over traditional billing"],"notFor":["Users needing detailed API documentation before purchasing","High-volume use cases where $0.02/request adds up significantly","Users without Base network USDC wallets"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.251Z"},"updatedAt":"2026-04-22T07:31:47.341Z"}}