{"id":"68540f9d-3afb-488e-a76f-bd3774b1d717","shortId":"YeLF5K","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/296` is listed as \"Premium API Access\" and returns a 402 challenge requesting 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 technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/296` 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"],"categories":["api-marketplace","finance"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","Purpose of /api/v1/transactions/296 is unknown — 'Premium API Access' is the only description","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/296","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/296","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is virtually no documentation: no OpenAPI schema, no request/response examples, and no explanation of what this specific endpoint returns. The docs pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'/request':13,28 '0.02':12,27,78,146 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62 'actual':188 'advertis':102 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,82,104,155 'attach':91 'base':8,23,51,73 'base network api' 'broader':100 'call':4,19,80 'caller':89 'categori':105 'challeng':67,200 'classif':121 'connect':164 'convers':138 'data':107,111,208 'descript':182 'detail':171 'doc':154 'document':149,203 'embed':122 'endpoint':55,141,187,191 'estim':132 'exampl':179 'exchang':127 'export':112 'extrem':151 'feed':126 'financ':123 'function':210 'gas':131 'generat':139 'geocod':136 'header':95 'i.e':77 'includ':106 'infrastructur':134 'insight':113 'json-response' 'key':83 'learn':116 'limit':86 'list':58 'live':193 'low payment fee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'micropayment api' 'multipl':103 'network':9,24,52 'no-api-key' 'openapi':175 'page':159 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,94 'per':3,18,36,79,147 'platform':6,21,39,101 'premium':60 'price':125,144,156 'prompt':166 'protocol':44 'provid':214 'quot':130 'rate':85,128 'readm':158 'render':161 'report':110 'request':37,68,98,148 'request/response':178 'requir':88 'respond':195 'return':64,189 'rout':213 'schema':176 'sentiment':117 'simpli':90 'spars':152 'specif':54,212 'summar':120 'technic':170 'text':119 'token':129 'unclear':206 'uniform':143 'unit':74 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':135 'valid':137,198 'via':10,25 'wallet':165 'web3':124 'without':202 'x402':11,26,43,93,199 'x402 api' 'x402-payment'","prices":[{"id":"fde1bfbe-84e8-4a23-8ad5-9d87e34bf509","listingId":"68540f9d-3afb-488e-a76f-bd3774b1d717","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/296","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:57.684Z"}],"sources":[{"listingId":"68540f9d-3afb-488e-a76f-bd3774b1d717","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/296","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:57.684Z","lastSeenAt":"2026-04-22T17:02:15.744Z"}],"details":{"listingId":"68540f9d-3afb-488e-a76f-bd3774b1d717","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/296 \\\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 requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/296"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/296"},{"claim":"API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","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":"2026-02-17T23:13:39.79Z"},"updatedAt":"2026-04-22T17:02:15.744Z"}}