{"id":"b677a654-6abf-485d-b457-4b8e5336e1ff","shortId":"nRLvXS","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/194` 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. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across four categories: 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 priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/transactions/194`) is labeled \"Premium API Access\" but no further documentation describes what data or functionality it returns. The docs, pricing, and API pages behind the landing page all render only a \"Connect wallet\" prompt with no additional content. Without schema details or example responses, the actual behavior of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — all doc/pricing/API pages show only 'Connect wallet'","The endpoint path /api/v1/transactions/194 and label 'Premium API Access' give no indication of what data or functionality is returned","No request or response schema is provided; callers cannot know what to send or expect back","This endpoint is not listed on the site's landing page among the advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/194","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/194","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 documentation, no OpenAPI schema, no example request/response, and the endpoint name 'Premium API Access' at /api/v1/transactions/194 is entirely opaque. All doc pages render only 'Connect wallet' with no useful 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'/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,164 'across':112 'actual':204 'addit':195 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,163,180 'attach':95 'base':8,23,51,73 'behavior':205 'behind':182 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67 'classif':129 'connect':190 'content':196 'convers':146 'crypto-paid API' 'data':115,119,171 'describ':169 'detail':199 'doc':177 'document':168 'embed':130 'endpoint':55,111,149,158,208 'estim':140 'exampl':201 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':173 'gas':139 'generat':147 'geocod':144 'header':100 'http-post' 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'key':86 'label':161 'land':184 'learn':124 'limit':89 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'page':181,185 'particular':157 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,154 'platform':6,21,39,82,109 'premium':60,162 'premium API access' 'price':133,151,178 'prompt':192 'proof':106 'protocol':44 'quot':138 'rate':88,136 'remain':209 'render':187 'report':118 'request':37,68,155 'respons':202 'return':64,175 'schema':198 'sentiment':125 'simpli':94 'specif':54 'summar':128 'text':127 'token':137 'unclear':210 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':191 'web3':132 'without':197 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"9689f806-6b9f-4b0e-8c81-5a8dfcec6190","listingId":"b677a654-6abf-485d-b457-4b8e5336e1ff","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/194","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:03.607Z"}],"sources":[{"listingId":"b677a654-6abf-485d-b457-4b8e5336e1ff","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/194","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:03.607Z","lastSeenAt":"2026-04-23T19:01:45.652Z"}],"details":{"listingId":"b677a654-6abf-485d-b457-4b8e5336e1ff","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/194 \\\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 requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/194"},{"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/194"},{"claim":"Docs, pricing, and API pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or transaction information via a single micropayment","Integrating pay-per-use API calls into agent workflows without managing API keys","Programmatic access to platform services settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume callers who would benefit from bulk/subscription pricing","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.296Z"},"updatedAt":"2026-04-23T19:01:45.652Z"}}