{"id":"8f05eef9-b561-402f-9595-b6d1c770e442","shortId":"MBYUaS","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/83` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of APIs: 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 listed at the same $0.02 per request price point. The x402 challenge confirms the endpoint is live and accepts POST requests.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/cards/83` endpoint specifically returns. The endpoint's purpose beyond \"Premium API Access\" is unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","finance-data","utility-apis","no-api-key","no-rate-limit"],"categories":["api-marketplace","crypto"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","402 payment api"],"warnings":["No documentation available — all doc/pricing/README pages render only 'Connect wallet' with no content.","The specific purpose of /api/v1/cards/83 ('Premium API Access') is undefined; no input or output schema is provided.","No OpenAPI spec, no example requests or responses, and no description of data returned.","Cannot verify what any of the advertised endpoints actually return without paying."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/83","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/83","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 confirms pricing and network details, but there is zero documentation on what the /api/v1/cards/83 endpoint actually does, no request/response schema, and all doc pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':199 'page':183 'pay-per-request api' 'payment':90 'per':53,79,157 'per-request':52 'per-request-micropayment' 'platform':5,22,110 'point':160 'post':171 'premium':71,219 'price':134,159,179 'prompt':190 'protocol':40 'purpos':217 'quot':139 'rate':102,137 'readm':182 'render':185 'report':119 'request':54,158,172 'request/response':202 'requir':107 'return':213 'schema':200 'scheme':97 'sentiment':126 'settl':56 'spars':176 'specif':64,212 'subscript':106 'summar':129 'technic':194 'text':128 'token':138 'unit':84 'unknown':223 'usdc':58,86 'usdc api access' 'usdc-base' 'util':13,30,144 'utility-apis' 'valid':146 'varieti':48 'via':93 'wallet':189 'web3':133 'x402':2,19,39,95,162 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"46a88793-2236-4703-816d-c26fc9f208b9","listingId":"8f05eef9-b561-402f-9595-b6d1c770e442","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:59.468Z"}],"sources":[{"listingId":"8f05eef9-b561-402f-9595-b6d1c770e442","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:59.468Z","lastSeenAt":"2026-04-23T02:31:11.826Z"}],"details":{"listingId":"8f05eef9-b561-402f-9595-b6d1c770e442","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/83 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/83"},{"claim":"All listed 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 APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/83"}],"useCases":["Agents that need on-demand access to analytics, AI, or finance data without managing API keys","Programmatic micropayment-gated data retrieval on Base L2","Quick one-off API calls (geocoding, validation, conversion) paid per request in USDC"],"bestFor":["Developers or agents wanting zero-commitment, pay-per-call API access","x402-compatible agents that can settle USDC on Base","Use cases requiring no signup or rate-limit-free access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.749Z"},"updatedAt":"2026-04-23T02:31:11.826Z"}}