{"id":"120a4711-f557-4fab-9435-b6668b183842","shortId":"nstm7W","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/110` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises multiple API categories including 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 uniformly priced at $0.02 per request.\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/transactions/110` endpoint actually returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what data or functionality this specific route provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","402 payment api"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/transactions/110 ('Premium API Access') is not explained anywhere","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/110","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/transactions/110","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 it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of the specific /api/v1/transactions/110 route is undocumented, making this effectively a stub 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'/request':13,28 '0.02':12,27,80,148 '000':74 '20':73 '402':66 '402 payment api' 'accept':46 'access':62 'actual':189 'advertis':104 'ai':116 'analysi':120 'analyt':110 'api':5,20,38,61,84,106,157 'attach':93 'base':8,23,51,75 'base network api' 'broader':102 'call':4,19,82 'caller':91 'categori':107 'challeng':67,201 'classif':123 'connect':166 'content':172 'convers':140 'data':109,113,209 'descript':183 'doc':156 'document':151,204 'embed':124 'endpoint':55,143,188,192 'estim':134 'exampl':180 'exchang':129 'export':114 'extrem':153 'feed':128 'financ':125 'function':211 'gas':133 'generat':141 'geocod':138 'header':97 'i.e':79 'includ':108 'infrastructur':136 'insight':115 'json-response' 'key':85 'learn':118 'limit':88 'list':58 'live':194 'low payment fee' 'lowpaymentfee.com':31 'machin':117 'metric':111 'micropayment api' 'multipl':105 'network':9,24,52 'no-api-key' 'openapi':176 'page':161 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,69,96 'per':3,18,36,81,149 'platform':6,21,39,103 'post-method' 'premium':60 'price':127,146,158 'prompt':168 'protocol':44 'provid':215 'quot':132 'rate':87,130 'readm':160 'render':163 'report':112 'request':37,100,150 'request/response':179 'requir':68,90 'respond':196 'return':64,190 'rout':214 'schema':177 'sentiment':119 'simpli':92 'spars':154 'specif':54,213 'summar':122 'text':121 'token':131 'unclear':207 'uniform':145 'unit':76 'usdc':15,30,47,78 'usdc api' 'usdc-base-network' 'use':41 'util':137 'valid':139,199 'via':10,25 'wallet':167 'web3':126 'without':203 'x402':11,26,43,95,200 'x402 api' 'x402-payment'","prices":[{"id":"c946c7ec-5432-4d0c-8883-1874e6e9f612","listingId":"120a4711-f557-4fab-9435-b6668b183842","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/transactions/110","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:11.898Z"}],"sources":[{"listingId":"120a4711-f557-4fab-9435-b6668b183842","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/110","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:11.898Z","lastSeenAt":"2026-04-23T23:03:08.153Z"}],"details":{"listingId":"120a4711-f557-4fab-9435-b6668b183842","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/110 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/110"},{"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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/110"}],"useCases":["Accessing premium API data without signing up for an account or obtaining API keys","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-use endpoints into autonomous agent workflows"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible wallet or USDC holdings","High-volume use cases where per-request pricing is cost-prohibitive compared to subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.702Z"},"updatedAt":"2026-04-23T23:03:08.153Z"}}