{"id":"9d9e3a2e-aadf-43c7-840f-27f7c46a5193","shortId":"aQBsrU","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/179` 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 X-PAYMENT header with a valid x402 payment proof.\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 listed at the same $0.02/request price point.\n\nHowever, the specific endpoint probed (`/api/v1/transactions/179`) does not clearly map to any of the advertised categories on the landing page. Its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without documentation or example responses, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","crypto-payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto API gateway"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'","The endpoint path /api/v1/transactions/179 does not match any advertised API category on the landing page","No OpenAPI spec or output schema describing what this endpoint actually returns","Purpose and response format of this specific endpoint are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/179","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/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example request/response, and the specific endpoint's purpose is undescribed beyond 'Premium API Access'. Docs pages returned only 'Connect wallet' with no 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'/request':13,28,154 '0.02':12,27,80,153 '000':74 '20':73 '402':66 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,183 'actual':218 'advertis':108,171 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,182,199 'attach':93 'base':8,23,51,75 'behavior':219 'broader':106 'call':4,19,82 'caller':91 'categori':111,172 'challeng':67 'classif':127 'clear':165 'connect':205 'content':211 'convers':144 'crypto API gateway' 'data':113,117,190 'descript':178 'doc':196 'document':187,213 'embed':128 'endpoint':55,147,160,222 'estim':138 'exampl':215 'exchang':133 'export':118 'feed':132 'financ':129 'function':192 'gas':137 'generat':145 'geocod':142 'header':98 'howev':157 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'json-response' 'key':85 'land':175 'learn':122 'limit':88 'list':58,149 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'map':166 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'page':176,200 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,97,103 'per':3,18,36,81 'platform':6,21,39,107 'point':156 'post-method' 'premium':60,181 'price':131,155,197 'probe':161 'prompt':207 'proof':104 'protocol':44 'quot':136 'rate':87,134 'render':202 'report':116 'request':37 'requir':68,90 'respons':216 'return':64,194 'sentiment':123 'simpli':92,180 'specif':54,159 'substant':210 'summar':126 'text':125 'token':135 'unit':76 'unknown':224 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':206 'web3':130 'without':212 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"cccd780d-1e44-43b4-945a-3018eba3bc5d","listingId":"9d9e3a2e-aadf-43c7-840f-27f7c46a5193","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/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:49.152Z"}],"sources":[{"listingId":"9d9e3a2e-aadf-43c7-840f-27f7c46a5193","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/179","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:49.152Z","lastSeenAt":"2026-04-22T04:02:04.308Z"}],"details":{"listingId":"9d9e3a2e-aadf-43c7-840f-27f7c46a5193","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/179 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/179"},{"claim":"All listed endpoints are priced at $0.02/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/179"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various data and utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet or x402-compatible client","High-volume consumers who would benefit from bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.959Z"},"updatedAt":"2026-04-22T04:02:04.308Z"}}