{"id":"90e4c315-e377-4307-8ade-2ca2219fa80d","shortId":"KbMyYk","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/charges/344` 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 on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The `maxAmountRequired` is 20000 base units, which at 6 decimals for USDC equals $0.02. The payment scheme is \"exact\" with a 300-second timeout. The output MIME type is `application/json`.\n\nHowever, the specific functionality behind `/api/v1/charges/344` is unclear — the title \"Premium API Access\" is generic and does not map to any of the named endpoints listed on the provider's homepage. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation or example request/response payloads, it is not possible to determine what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific purpose of /api/v1/charges/344 is unknown — 'Premium API Access' is a generic label not mapped to any documented endpoint.","All documentation pages (/docs, /pricing, /api, /README) returned no useful content beyond 'Connect wallet'.","No OpenAPI schema, request/response examples, or parameter documentation available.","Cannot verify what data or service is actually returned upon successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/344","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/charges/344","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/charges/344 is undocumented. All doc pages return only 'Connect wallet' with no schemas, examples, or descriptions. The endpoint title is generic and does not clarify what it 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'/api/v1/charges/344':49,152 '/docs':180 '/pricing':181 '/readme':183 '0.02':12,28,78,130 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':114 '20000':120 '300':138 '6':125 'Base network API' 'USDC micropayment API' 'accept':105 'access':7,23,40,159 'ai':65 'analyt':64 'api':6,22,39,90,158 'application/json':146 'base':9,25,86,116,121 'behind':151 'call':4,20 'categori':61 'challeng':99 'commit':95 'confirm':100 'connect':188 'content':194 'contract':113 'crypto-paid API' 'data':63,209 'decim':126 'determin':207 'document':178,197 'endpoint':34,54,74,102,171,214 'equal':129 'exact':135 'exampl':199 'financ':68 'function':150 'generic':161 'homepag':177 'howev':147 'includ':62 'infrastructur':71 'json-response' 'key':91 'learn':67 'limit':93 'list':172 'live':104 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':66 'mani':53 'map':165 'maxamountrequir':118 'mime':143 'name':170 'network':87 'no-api-key' 'no-rate-limit' 'offer':55 'one':51 'output':142 'page':179 'particular':213 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payabl':81 'payload':201 'payment':44,110,132 'per':3,13,19,29,79 'possibl':205 'post':106 'premium':5,21,38,157 'premium API access' 'price':76 'prompt':190 'protocol':45 'provid':37,58,175 'rate':92 'request':14,30,80,107 'request/response':200 'requir':96 'resourc':48 'return':185,215 'scheme':133 'second':139 'servic':211 'settl':109 'span':60 'specif':47,149 'substant':193 'timeout':140 'titl':156 'type':144 'unclear':154 'unit':122 'usdc':16,32,83,112,128 'usdc-base' 'util':72 'via':10,26,41 'wallet':189 'web3':69 'without':195 'x402':11,27,43,98 'x402 API' 'x402-payment'","prices":[{"id":"4a4bc70f-1a79-4820-a923-fe140d20723d","listingId":"90e4c315-e377-4307-8ade-2ca2219fa80d","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/charges/344","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:11.522Z"}],"sources":[{"listingId":"90e4c315-e377-4307-8ade-2ca2219fa80d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/344","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:11.522Z","lastSeenAt":"2026-04-22T12:03:42.058Z"}],"details":{"listingId":"90e4c315-e377-4307-8ade-2ca2219fa80d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/344 \\\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 per request with no API keys, rate limits, or minimums","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","source_url":"https://lowpaymentfee.com/api/v1/charges/344"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/344"}],"useCases":["Accessing paid API endpoints without traditional API key registration","Making one-off API calls settled in USDC on Base","Agent-driven workflows requiring permissionless, pay-as-you-go API access"],"bestFor":["Developers who want instant API access without signup or API keys","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or example payloads before integrating","Anyone without a Base-compatible wallet or USDC balance","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.271Z"},"updatedAt":"2026-04-22T12:03:42.058Z"}}