{"id":"acec6045-a89a-487b-b5a5-4d69595d49bc","shortId":"ytganj","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/claims/54` 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 returning application/json.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/claims/54` endpoint specifically returns. The endpoint's purpose beyond \"Premium API Access\" is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-call api","base network api","usdc api access","402 payment api"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available for any endpoint","The specific function of /api/v1/claims/54 is unknown — 'Premium API Access' is not descriptive","No request body schema or response examples are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/54","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/claims/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/claims/54 is undescribed beyond a generic 'Premium API Access' 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'metric':117 'micropay':54 'micropayment api' 'network':61 'offer':8,25 'openapi':199 'page':184 'pay-per-call api' 'payment':89 'per':52,78,156 'per-request':51 'per-request-micropayment' 'platform':5,22,109 'point':159 'post':170 'premium':70,219 'price':133,158,181 'prompt':191 'protocol':39 'purpos':217 'quot':138 'rate':101,136 'readm':183 'render':186 'report':118 'request':53,157,171 'request/response':202 'requir':106 'return':172,213 'schema':200 'scheme':96 'sentiment':125 'sentiment-analysis' 'settl':55 'spars':177 'specif':63,212 'subscript':105 'summar':128 'text':127 'text-summarization' 'token':137 'unclear':223 'unit':83 'usdc':57,85 'usdc api access' 'usdc-base' 'util':13,30,143 'utility-apis' 'valid':145 'varieti':47 'via':92 'wallet':190 'web3':132 'x402':2,19,38,94,161 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"07c1a357-94e2-430f-ab27-89637b66d014","listingId":"acec6045-a89a-487b-b5a5-4d69595d49bc","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/claims/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:52.518Z"}],"sources":[{"listingId":"acec6045-a89a-487b-b5a5-4d69595d49bc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:52.518Z","lastSeenAt":"2026-04-23T01:01:25.557Z"}],"details":{"listingId":"acec6045-a89a-487b-b5a5-4d69595d49bc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/54 \\\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/claims/54"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/54"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API keys or subscriptions","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates via micropayments","Running data analytics queries and exporting data on a pay-per-use basis","Using utility services like geocoding, validation, and conversion with no rate limits"],"bestFor":["Agents or developers who want zero-commitment, pay-per-call API access","Use cases requiring no API key management or account signup","Crypto-native applications already operating on the Base network"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.275Z"},"updatedAt":"2026-04-23T01:01:25.557Z"}}