{"id":"062c80b5-5eab-4984-b1b2-d5c02dd6cec4","shortId":"AQBJ5Q","kind":"x402","title":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","description":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-request API endpoints on the Base network, settling in USDC. The specific endpoint `/api/v1/cards/5` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact-payment scheme — no API keys, no rate limits, and no sign-up required. You send a POST request with an `X-PAYMENT` header containing a valid payment proof, and the endpoint returns JSON.\n\nThe broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request.\n\nThe specific functionality of `/api/v1/cards/5` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live (returns a proper 402 challenge), but what data or service it actually provides is unclear.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","json-response","no-api-key","post-method"],"categories":["api","infrastructure"],"synonyms":["pay-per-request API","x402 endpoint","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content.","The specific functionality of /api/v1/cards/5 is unknown; 'Premium API Access' is not descriptive.","No OpenAPI schema or request/response examples are provided.","No information about what 'cards/5' refers to — could be anything."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/5","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/cards/5","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 with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty. The purpose of '/api/v1/cards/5' is entirely opaque beyond the generic label 'Premium API 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'0.02':10,24,62,163 '000':66 '20':65 '402':214 '6':72 'Base network API' 'USDC API' 'access':59,179 'across':122 'actual':222 'addit':204 'ai':132 'analysi':136 'analyt':126 'api':5,19,41,58,85,178 'base':8,22,45,67 'base-network' 'beyond':174 'broader':118 'call':64 'categori':124 'challeng':215 'classif':139 'collect':32 'confirm':209 'connect':199 'contain':107 'content':205 'convers':156 'cost':61 'crypto-paid API' 'data':125,129,218 'decim':73 'doc':190 'document':173 'embed':140 'endpoint':6,20,42,52,114,121,159,207 'estim':150 'exact':81 'exact-pay':80 'exampl':187 'exchang':145 'export':130 'feed':144 'financ':141 'four':123 'function':168 'gas':149 'gate':3,17 'generat':157 'geocod':154 'handl':76 'header':106 'host':30 'infrastructur':152 'insight':131 'json':116 'json-response' 'key':86 'label':176 'learn':134 'limit':89 'list':55 'live':210 'lowpaymentfee' 'lowpaymentfee.com':29 'machin':133 'metric':127 'micropayment API' 'network':46 'no-api-key' 'offer':120 'openapi':183 'page':194 'pay':9,23,38 'pay-per-request':37 'pay-per-request API' 'payment':74,82,105,110 'per':11,25,39,63,164 'per-request-billing' 'platform':119 'post':99 'post-method' 'premium':4,18,57,177 'premium API access' 'price':143,161,191 'prompt':201 'proof':111 'proper':213 'protocol':36 'provid':223 'quot':148 'rate':88,146 'readm':193 'render':196 'report':128 'request':12,26,40,100,165 'request/response':186 'requir':95 'return':115,211 'schema':184 'scheme':83 'send':97 'sentiment':135 'servic':220 'settl':47 'sign':93 'sign-up':92 'specif':51,167 'summar':138 'text':137 'token':147 'unclear':225 'unit':68 'usdc':14,28,49,70 'usdc-settlement' 'util':153 'valid':109,155 'via':77 'wallet':200 'web3':142 'x':104 'x-payment':103 'x402':2,16,35,79 'x402 endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':34","prices":[{"id":"b4472518-113e-47f7-b499-bbf8fea82a34","listingId":"062c80b5-5eab-4984-b1b2-d5c02dd6cec4","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/cards/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:36.402Z"}],"sources":[{"listingId":"062c80b5-5eab-4984-b1b2-d5c02dd6cec4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:36.402Z","lastSeenAt":"2026-04-22T15:01:11.046Z"}],"details":{"listingId":"062c80b5-5eab-4984-b1b2-d5c02dd6cec4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/5 \\\n  -H \"X-PAYMENT: <valid-x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","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/v1/cards/5"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/5"}],"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","Demonstrating or testing x402 payment protocol integrations"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","AI agents that can autonomously pay for API calls via USDC on Base","Users who want no-signup, no-rate-limit API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone requiring non-crypto payment methods","Use cases needing high-volume batch access at lower per-unit cost"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.858Z"},"updatedAt":"2026-04-22T15:01:11.046Z"}}