{"id":"a169bb40-df99-404e-9b53-b9560cea2e7b","shortId":"ZSzDNT","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com is part of a suite of x402-protocol pay-per-call APIs hosted on the Base network. The specific resource `/api/v1/cards/96` is labeled \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge. Payment is settled in USDC (contract 0x8335…2913) on Base, with a maximum amount of 20,000 base units — equivalent to $0.02 per request (USDC uses 6 decimals). No API keys, subscriptions, or rate limits are advertised; callers simply attach an X-PAYMENT header to each request.\n\nThe broader lowpaymentfee.com 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 are priced at $0.02 per request. However, the specific `/api/v1/cards/96` endpoint does not clearly map to any of these documented categories, and no schema or documentation describes its request body or response format.\n\nThe endpoint is live and returns a well-formed x402 challenge (HTTP 402) when called without payment. Documentation pages beyond the landing page are essentially empty (showing only \"Connect wallet\"), so details about input parameters, response structure, and actual functionality behind this particular endpoint remain unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment required API","crypto-gated endpoint"],"warnings":["No documentation exists for the /api/v1/cards/96 endpoint — its actual functionality is unknown.","All documentation pages (docs, api, pricing, README) are effectively empty, showing only 'Connect wallet'.","The endpoint path '/api/v1/cards/96' does not correspond to any of the documented API categories on the landing page.","No request or response schema is available; callers cannot know what to send or expect back."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/96","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/96","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 for the /api/v1/cards/96 resource — no input schema, no response schema, no description of what it actually returns. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. The endpoint's purpose ('Premium API Access') is entirely 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'0.02':10,24,92,165 '000':87 '0x8335':77 '20':86 '2913':78 '402':208 '402 payment required API' '6':97 'Base network API' 'USDC micropayment API' 'accept':62 'access':6,20,60 'across':125 'actual':234 'advertis':107 'ai':135 'amount':84 'analysi':139 'analyt':129 'api':5,19,46,59,100 'attach':110 'base':8,22,50,80,88 'base-network' 'behind':236 'beyond':215 'bodi':191 'broader':120 'call':45,210 'caller':108 'categori':127,182 'challeng':70,206 'classif':142 'clear':175 'connect':224 'contract':76 'convers':159 'crypto-gated endpoint' 'data':128,132 'decim':98 'describ':188 'detail':227 'document':181,187,213 'embed':143 'empti':221 'endpoint':30,124,172,196,239 'equival':90 'essenti':220 'estim':153 'exchang':148 'export':133 'feed':147 'financ':144 'form':204 'format':194 'four':126 'function':235 'gas':152 'gate':3,17,65 'generat':160 'geocod':157 'header':115 'host':47 'howev':168 'http':207 'infrastructur':155 'input':229 'insight':134 'key':101 'label':57 'land':217 'learn':137 'limit':105 'live':198 'lowpaymentfee' 'lowpaymentfee.com':32,121 'machin':136 'map':176 'maximum':83 'metric':130 'network':51 'no-api-key' 'offer':123 'page':214,218 'paramet':230 'part':34 'particular':238 'pay':9,23,43 'pay-per-cal':42 'pay-per-call API' 'pay-per-request' 'payment':69,71,114,212 'per':11,25,44,93,166 'platform':122 'post':63 'post-endpoint' 'premium':4,18,58 'price':146,163 'protocol':41 'quot':151 'rate':104,149 'remain':240 'report':131 'request':12,26,64,94,118,167,190 'resourc':54 'respons':193,231 'return':200 'schema':185 'sentiment':138 'settl':73 'show':222 'simpli':109 'specif':53,170 'structur':232 'subscript':102 'suit':37 'summar':141 'text':140 'token':150 'unit':89 'unknown':241 'usdc':14,28,75,95 'usdc-settlement' 'use':96 'util':156 'valid':158 'wallet':225 'web3':145 'well':203 'well-form':202 'without':211 'x':113 'x-payment':112 'x402':2,16,40,68,205 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':39","prices":[{"id":"aef8654a-85f4-4dea-bc6e-fa6d4f35d014","listingId":"a169bb40-df99-404e-9b53-b9560cea2e7b","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/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:55.180Z"}],"sources":[{"listingId":"a169bb40-df99-404e-9b53-b9560cea2e7b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/96","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:55.180Z","lastSeenAt":"2026-04-24T06:32:00.593Z"}],"details":{"listingId":"a169bb40-df99-404e-9b53-b9560cea2e7b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/96 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/96"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/96"},{"claim":"All listed APIs 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"}],"useCases":["Programmatic access to a premium API resource with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API calls settled on Base","Demonstrating x402 protocol integration for pay-per-use services"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can attach x402 payment headers for per-call billing","Low-volume, on-demand API consumption without subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.897Z"},"updatedAt":"2026-04-24T06:32:00.593Z"}}