{"id":"ee2a45fb-f72d-48a2-8840-c64687854160","shortId":"QUKBG7","kind":"x402","title":"Pay-per-call premium API endpoint on Base network via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API endpoint on Base network via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com/api/endpoint-63 is an x402-enabled pay-per-call API labeled \"Premium API Access.\" It accepts POST requests and charges 20,000 base units of USDC (0x8335…2913 on Base network), which equals $0.02 per request. Payment is handled via the x402 protocol's exact scheme — no API keys, subscriptions, or rate limits are required.\n\nThe provider's site lists multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, all priced at $0.02 per request. However, this specific endpoint (/api/endpoint-63) does not correspond to any of the named endpoints on the landing page, and no documentation describes what it actually returns. The output schema only specifies that it accepts HTTP POST and is discoverable, with a JSON mime type response.\n\nWithout additional documentation or example responses, the exact functionality of this endpoint remains unclear. The endpoint is confirmed live (returns a valid 402 challenge), settles on Base via USDC, and has a 300-second payment timeout. The provider advertises no rate limits and instant access with no API keys required beyond the x402 payment header.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response","http-post"],"categories":["api","infrastructure"],"synonyms":["premium API","pay-per-request API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["Endpoint /api/endpoint-63 is not listed among the provider's documented APIs — its actual functionality is unknown","No OpenAPI spec, no request/response examples, and docs pages only show 'Connect wallet'","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-63","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/endpoint-63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example responses, and the endpoint path (/api/endpoint-63) does not match any documented API on the provider's site. Functionality is entirely unknown beyond the payment 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'/request':18,36 '0.02':17,35,76,120 '000':64 '0x8335':69 '20':63 '2913':70 '300':200 '402':190 'Base network API' 'USDC micropayment API' 'accept':58,156 'access':56,212 'actual':147 'addit':169 'advertis':206 'ai':109 'analyt':108 'api':6,24,52,55,90,104,215 'base':9,27,65,72,194 'base-network' 'beyond':218 'call':4,22,51 'categori':105 'challeng':191 'charg':62 'confirm':185 'correspond':130 'data':107 'describ':144 'discover':161 'document':143,170 'enabl':47 'endpoint':7,25,38,126,136,179,183 'equal':75 'exact':87,175 'exampl':172 'financ':112 'function':176 'handl':81 'header':222 'howev':123 'http':157 'http-post' 'includ':106 'infrastructur':115 'instant':211 'json':164 'json-response' 'key':91,216 'label':53 'land':139 'learn':111 'limit':95,209 'list':102 'live':186 'lowpaymentfee' 'lowpaymentfee.com':41 'lowpaymentfee.com/api/endpoint-63':40 'machin':110 'mime':165 'multipl':103 'name':135 'network':10,28,73 'no-api-key' 'output':150 'page':140 'pay':2,20,49 'pay-per-cal':1,19,48 'pay-per-call' 'pay-per-request API' 'payment':79,202,221 'per':3,21,50,77,121 'post':59,158 'premium':5,23,54 'premium API' 'price':118 'protocol':85 'provid':99,205 'rate':94,208 'remain':180 'request':60,78,122 'requir':97,217 'respons':167,173 'return':148,187 'schema':151 'scheme':88 'second':201 'settl':13,31,192 'site':101 'specif':125 'specifi':153 'subscript':92 'timeout':203 'type':166 'unclear':181 'unit':66 'usdc':15,33,68,196 'usdc-settlement' 'util':116 'valid':189 'via':11,29,82,195 'web3':113 'without':168 'x402':12,30,46,84,220 'x402 endpoint' 'x402-enabled':45 'x402-payment'","prices":[{"id":"62b4f47a-dcba-4503-a24c-f335aa0ab532","listingId":"ee2a45fb-f72d-48a2-8840-c64687854160","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/endpoint-63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:50.407Z"}],"sources":[{"listingId":"ee2a45fb-f72d-48a2-8840-c64687854160","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:50.407Z","lastSeenAt":"2026-04-23T00:31:03.981Z"}],"details":{"listingId":"ee2a45fb-f72d-48a2-8840-c64687854160","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-63 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-63"},{"claim":"The provider 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/endpoint-63"}],"useCases":["Programmatic access to a premium API without subscription or API key management","Agent-driven workflows requiring per-call payment settlement on Base","Testing x402 payment protocol integrations"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents with x402 payment capability on Base network","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing well-documented endpoint behavior before paying","High-volume use cases where per-call pricing adds up quickly","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:18:29.83Z"},"updatedAt":"2026-04-23T00:31:03.981Z"}}