{"id":"2c26a0ac-548a-4ae3-813d-4586a4539eba","shortId":"5HCyWr","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":"This endpoint at `/api/v1/cards/97` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific resource at `/cards/97` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. It is one of many endpoints on the platform, all priced uniformly at $0.02 per call.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The challenge advertises a `maxAmountRequired` of 20,000 base units, which at 6 decimals equals $0.02. No API keys or rate limits are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The endpoint accepts HTTP POST requests and returns `application/json`.\n\nThe broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available. The exact behavior of `/api/v1/cards/97` specifically is unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-response","http-post"],"categories":["api-gateway","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay per call API","USDC micropayment API","Base network API"],"warnings":["The exact functionality of /api/v1/cards/97 ('Premium API Access') is completely undocumented — its purpose is unknown.","No OpenAPI spec, request schema, or response schema is available anywhere on the site.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content.","The platform lists many endpoints but none have detailed documentation; integration requires trial and error."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/97","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/97","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 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what '/api/v1/cards/97' actually does. The docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/cards/97':67 '0.02':10,24,96,129,186 '000':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20':120 '6':126 'Base network API' 'USDC micropayment API' 'accept':154 'access':72 'advertis':116 'ai':55 'analysi':168 'analyt':54 'api':5,19,51,71,131,196 'application/json':160 'attach':140 'avail':225 'base':8,22,108,122 'base-network' 'behavior':228 'beyond':80 'broader':162 'call':98 'caller':138 'challeng':115 'classif':171 'collect':42 'connect':205 'contract':112 'convers':179 'data':53 'decim':127 'detail':212 'doc':195 'document':79,190 'embed':172 'endpoint':6,20,30,88,153,165 'equal':128 'exact':75,227 'exampl':224 'exchang':175 'extrem':192 'feed':174 'financ':58 'function':76 'gate':3,17 'generat':181 'geocod':177 'handl':101 'header':145 'howev':189 'http':155 'http-post' 'infrastructur':61 'json-response' 'key':132 'label':69,82 'learn':57 'limit':135 'list':164 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'mani':87 'maxamountrequir':118 'network':109 'offer':40 'one':85 'openapi':216 'page':200 'part':34 'pay':9,23,48 'pay per call API' 'pay-per-request':47 'payment':99,144,150 'per':11,25,49,97 'platform':38,91,163 'point':188 'post':156 'premium':4,18,70 'price':93,173,187,197 'prompt':207 'proof':151 'protocol':46,105 'rate':134,176 'readm':199 'render':202 'request':12,26,50,157 'request/response':219 'requir':137 'resourc':65 'return':159 'schema':220 'sentiment':167 'simpli':139 'span':52 'spars':193 'spec':217 'specif':64,231 'summar':170 'technic':211 'text':169 'uniform':94 'unit':123 'unknown':233 'usag':223 'usdc':14,28,111 'usdc-settlement' 'use':110 'util':62 'valid':148,178 'via':102 'wallet':206 'web3':59 'x':143 'x-payment':142 'x402':2,16,45,104,149 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"a8adbc51-18f9-46ba-924b-5ab6eb1d771c","listingId":"2c26a0ac-548a-4ae3-813d-4586a4539eba","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:00.089Z"}],"sources":[{"listingId":"2c26a0ac-548a-4ae3-813d-4586a4539eba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:00.089Z","lastSeenAt":"2026-04-22T08:31:02.646Z"}],"details":{"listingId":"2c26a0ac-548a-4ae3-813d-4586a4539eba","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/97 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/97"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/97"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","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":"Docs, API, pricing, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without API key management","Programmatic pay-as-you-go endpoint access on Base L2"],"bestFor":["Developers wanting keyless, pay-per-request API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before integrating","Applications requiring free or subscription-based access","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.738Z"},"updatedAt":"2026-04-22T08:31:02.646Z"}}