{"id":"e0510af5-94a0-477c-bf48-7f316d28aac2","shortId":"rnWhxz","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/item/2` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, 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 documentation, and no usage examples available. The actual functionality behind `/api/v1/item/2` (\"Premium API Access\") is not described beyond its title, making it unclear what data or service it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/item/2 ('Premium API Access') is not described anywhere","No request body schema or response schema available — callers cannot know what to send or expect back"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/2","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/item/2","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 OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of '/api/v1/item/2' ('Premium API Access') is entirely undescribed. This is effectively a stub 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'/request':13,28 '0.02':12,27,61,119,171 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x8335':113 '20':107 '2913':114 '300':139 '6':123 'accept':93 'access':91,219 'across':45 'actual':213 'address':135 'advertis':145 'ai':48 'analysi':149 'analyt':47 'api':5,20,37,73,90,181,218 'avail':211 'base':8,23,69,109,116 'base network api' 'behind':215 'beyond':223 'broader':143 'call':4,19 'categori':55 'challeng':98 'classif':152 'commit':80 'confirm':99 'connect':190 'convers':164 'data':46,230 'decim':124 'describ':222 'detail':197 'doc':180 'document':175,206 'embed':153 'enabl':36 'endpoint':44,57,84,146 'equal':118 'estim':161 'exact':131 'exampl':210 'exchang':156 'extrem':177 'feed':155 'financ':51 'function':214 'gas':160 'generat':166 'geocod':162 'given':120 'howev':174 'infrastructure/utility':54 'json-response' 'key':74 'learn':50 'limit':77 'list':87 'live':102 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':49 'made':127 'make':226 'maximum':105 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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/item/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:35.748Z"}],"sources":[{"listingId":"e0510af5-94a0-477c-bf48-7f316d28aac2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:35.748Z","lastSeenAt":"2026-04-24T21:31:38.411Z"}],"details":{"listingId":"e0510af5-94a0-477c-bf48-7f316d28aac2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/2 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/item/2"},{"claim":"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 render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment flows with low-cost endpoints"],"bestFor":["Developers exploring x402 pay-per-call patterns","Agents needing keyless, instant API access on Base","Low-cost micropayment API experimentation"],"notFor":["Users who need detailed API documentation or schemas before integrating","Production workloads requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.349Z"},"updatedAt":"2026-04-24T21:31:38.411Z"}}