{"id":"4d58c305-64bf-4dfc-8007-165f7727fe77","shortId":"fpGXLs","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","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 provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC (USD Coin) on Base with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/benefits/36` is listed under the title \"Premium API Access\" but the provider does not document what data or functionality this particular path returns. The x402 challenge confirms the endpoint is live: it accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given 6 decimals), and returns `application/json`. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\n\nBecause the provider's documentation pages (docs, pricing, README) all render only a \"Connect wallet\" prompt with no further content, there is no schema, example request/response, or detailed description available for this endpoint. The actual payload and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-on-base","per-request-billing","no-api-key","json-response","post-method"],"categories":["api-gateway","misc"],"synonyms":["premium API","lowpaymentfee","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["No documentation available — all doc pages render only a 'Connect wallet' prompt with no content.","The purpose and response schema of /api/v1/benefits/36 are completely unknown; 'Premium API Access' is not descriptive.","Cannot verify what data or service this endpoint provides; integrate with caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/36","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/benefits/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually does — no input schema, no output schema, no examples. The docs, pricing, and README pages are all empty (wallet-connect only). The 'Premium API Access' title is generic and 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'0.02':10,29,85,155 '000':149 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':170 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':175 '20':148 '6':157 'Base network API' 'USDC API access' 'accept':141 'access':6,25,46,117 'actual':212 'address':169 'ai':72 'analyt':71 'api':5,24,45,97,116 'application/json':161 'avail':207 'base':8,27,54,94,150,177 'categori':68 'chain':167 'challeng':134 'charg':144 'coin':92 'commit':105 'confirm':135 'connect':191 'content':197 'contract':174 'data':70,125 'decim':158 'descript':206 'detail':205 'doc':184 'document':123,182 'endpoint':40,61,81,108,137,210 'exampl':202 'financ':75 'function':127 'gate':3,22 'given':156 'i.e':154 'includ':69 'infrastructur':78 'json-response' 'key':16,35,98 'learn':74 'limit':19,38,101 'list':111 'live':139 'lowpaymentfee' 'lowpaymentfee.com':42 'machin':73 'mani':60 'maximum':146 'micropayment API' 'minimum':104 'network':55 'no-api-key' 'offer':62 'on-chain':165 'one':58 'page':183 'particular':129 'path':130 'pay':9,28 'pay-per-call API' 'payabl':88 'payload':213 'payment':50,162 'per':11,30,86 'per-request-billing' 'post':142 'post-method' 'premium':4,23,44,115 'premium API' 'price':83,185 'prompt':193 'protocol':51 'provid':43,65,120,180 'rate':18,37,100 'readm':186 'render':188 'request':12,31,87,143 'request/response':203 'respons':215 'return':131,160 'schema':201 'settl':164 'span':67 'specif':107 'structur':216 'titl':114 'unit':151 'unknown':218 'usd':91 'usdc':14,33,90,153,173 'usdc-on-base' 'use':171 'util':79 'via':47 'wallet':192 'web3':76 'x402':2,21,49,133 'x402 API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"85a0edff-5cd3-4f4c-9c33-cf28e401bd87","listingId":"4d58c305-64bf-4dfc-8007-165f7727fe77","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/benefits/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:38.325Z"}],"sources":[{"listingId":"4d58c305-64bf-4dfc-8007-165f7727fe77","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:38.325Z","lastSeenAt":"2026-04-22T05:31:53.980Z"}],"details":{"listingId":"4d58c305-64bf-4dfc-8007-165f7727fe77","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/36 \\\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 402 with x402 challenge advertising USDC on Base, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/benefits/36"},{"claim":"All endpoints priced at $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/benefits/36"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled on Base","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","AI agents that need frictionless, keyless API access on Base","Users who want pay-per-use pricing without subscriptions or rate limits"],"notFor":["Users who need detailed documentation or known response schemas before integrating","High-volume consumers who prefer flat-rate or subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.268Z"},"updatedAt":"2026-04-22T05:31:53.980Z"}}