{"id":"9fdc0534-3b35-4666-9238-04197220af90","shortId":"KELZMt","kind":"x402","title":"x402-gated premium API access on Base network, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base network, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints on the platform are priced at $0.02 per request, payable in USDC (USD Coin) on Base with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/products/51` is listed as \"Premium API Access\" but lacks detailed documentation about what data or functionality it returns. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (which equals $0.02 given USDC's 6 decimals) per call. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. The actual response schema and input parameters for this specific endpoint are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","base network api","premium api access"],"warnings":["No documentation available for this specific endpoint — docs pages only show 'Connect wallet'","No input parameters or output schema documented","The purpose of /api/v1/products/51 ('Premium API Access') is unclear and may be a generic placeholder","Platform appears to list many endpoints but provides no substantive documentation for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/51","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/products/51","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 402 challenge and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation on what this endpoint actually returns, no input/output schema, and the docs pages are empty. The listing is effectively a stub with confirmed 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'0.02':11,26,79,144 '000':137 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '20':136 '300':160 '6':148 'USDC micropayment api' 'accept':128 'access':6,21,38,109,174 'actual':199 'address':156 'advertis':165 'ai':62 'analyt':61 'api':5,20,37,91,108,167,182 'base':8,23,46,88,138 'base network api' 'call':151 'categori':70 'challeng':123 'charg':132 'coin':86 'commit':98 'confirm':124 'connect':191 'content':197 'data':60,116 'decim':149 'detail':112 'doc':181 'document':113,176 'endpoint':32,53,72,102,208 'equal':143 'extrem':178 'financ':65 'function':118 'gate':3,18 'given':145 'howev':175 'infrastructur':68 'input':203 'instant':173 'key':92,168 'lack':111 'learn':64 'limit':95,171 'list':105 'live':127 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':63 'mani':52 'maximum':134 'network':9,24,47 'no-api-key' 'offer':54 'one':50 'page':186 'paramet':204 'pay':10,25 'pay-per-call api' 'pay-per-request' 'payabl':82 'payment':42,152 'per':12,27,80,150 'platform':57,75,164 'post':129 'post-method' 'premium':4,19,36,107 'premium api access' 'price':77,183 'prompt':193 'protocol':43 'provid':35 'rate':94,170 'readm':185 'render':188 'request':13,28,81,130 'requir':99 'respons':200 'return':120 'schema':201 'second':161 'sent':154 'span':59 'spars':179 'specif':101,207 'timeout':162 'undocu':210 'unit':139 'usd':85 'usdc':15,30,84,141,146 'usdc-base-network' 'util':69 'via':39 'wallet':192 'web3':66 'x402':2,17,41,122 'x402 api' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"1a16d011-d4db-4d33-b462-1cb98bf24aff","listingId":"9fdc0534-3b35-4666-9238-04197220af90","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/products/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:33.713Z"}],"sources":[{"listingId":"9fdc0534-3b35-4666-9238-04197220af90","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:33.713Z","lastSeenAt":"2026-04-23T18:03:20.608Z"}],"details":{"listingId":"9fdc0534-3b35-4666-9238-04197220af90","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/51 \\\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":"Platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms endpoint is live, accepts POST, charges max 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/51"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/51"}],"useCases":["Accessing premium data or services with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to platform services"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation before purchasing","Applications requiring guaranteed SLAs or support contracts","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.374Z"},"updatedAt":"2026-04-23T18:03:20.608Z"}}