{"id":"f6e9119d-fa84-421f-8149-ad07917e0975","shortId":"qXYUWf","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific endpoint `/api/v1/item/46` 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, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live and accepts exact-scheme payments on Base. The asset address (0x8335…) corresponds to USDC on Base, and the maxAmountRequired of 20000 base units equals $0.02 (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST requests and returns application/json.\n\nHowever, the specific functionality behind `/api/v1/item/46` is unclear. It does not match any of the named endpoints listed on the provider's homepage (analytics, AI, finance, or utility routes). No OpenAPI schema, request/response examples, or detailed documentation were found — the docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this particular item endpoint does, callers should treat it as an opaque premium resource.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["api","infrastructure"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","premium API endpoint"],"warnings":["The specific purpose of /api/v1/item/46 is undocumented — it does not correspond to any named endpoint on the provider's homepage.","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no useful content.","No OpenAPI spec, request schema, or response schema available — callers cannot know what to send or expect back."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/46","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/item/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/item/46 is unknown. No OpenAPI schema, no request/response examples, and no meaningful documentation were found. The endpoint path does not match any named service on the 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'/request':13,28 '0.02':12,27,76,128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '0x8335':114 '20000':124 '300':141 '6':131 'Base network API' 'USDC micropayment API' 'accept':104,146 'access':7,22,38 'address':113,137 'ai':63,177 'analyt':62,176 'api':6,21,37,88,194 'application/json':152 'asset':112 'base':9,24,84,110,119,125 'behind':157 'call':4,19 'caller':218 'categori':59 'challeng':97 'commit':93 'confirm':98 'connect':203 'content':209 'correspond':115 'data':61 'decim':132 'detail':188 'doc':193 'document':189 'endpoint':32,46,52,72,100,145,169,216 'equal':127 'exact':106 'exact-schem':105 'exampl':186 'financ':66,178 'found':191 'function':156 'homepag':175 'howev':153 'http':147 'http-post' 'includ':60 'infrastructur':69 'item':215 'json-response' 'key':89 'know':211 'learn':65 'limit':91 'list':170 'live':102 'low payment fee API' 'lowpaymentfee.com':34 'machin':64 'mani':51 'match':164 'maxamountrequir':122 'name':168 'network':85 'offer':53 'one':49 'opaqu':224 'openapi':183 'page':198 'paid':79 'particular':214 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,108,133 'per':3,18,77 'post':148 'premium':5,20,36,225 'premium API endpoint' 'price':74,195 'prompt':205 'protocol':43 'provid':35,56,173 'rate':90 'readm':197 'request':78,149 'request/response':185 'requir':94 'resourc':226 'return':151,200 'rout':181 'schema':184 'scheme':107 'second':142 'sent':135 'span':58 'specif':45,155 'substant':208 'timeout':143 'treat':220 'unclear':160 'unit':126 'usdc':15,30,81,117,129 'usdc-base' 'use':130 'util':70,180 'via':10,25,39 'wallet':204 'web3':67 'without':210 'x402':11,26,41,96 'x402 API' 'x402-payment'","prices":[{"id":"d57d4edb-8ceb-4635-8656-d66b642c982a","listingId":"f6e9119d-fa84-421f-8149-ad07917e0975","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/item/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:47.793Z"}],"sources":[{"listingId":"f6e9119d-fa84-421f-8149-ad07917e0975","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:47.793Z","lastSeenAt":"2026-04-23T02:00:24.488Z"}],"details":{"listingId":"f6e9119d-fa84-421f-8149-ad07917e0975","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/46 \\\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":"All endpoints priced at $0.02/request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/item/46"},{"claim":"Asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/item/46"}],"useCases":["Programmatic access to a premium resource with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base","Use cases requiring no-signup, no-API-key access"],"notFor":["Users who need detailed documentation or known response schemas before integrating","High-volume callers who prefer subscription pricing over per-request payments","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:16:10.636Z"},"updatedAt":"2026-04-23T02:00:24.488Z"}}