{"id":"48de7585-cb92-453a-8fff-b455acecb305","shortId":"7BqqZ6","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/304` 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/304`) is labeled \"Premium API Access\" but its actual functionality is not documented beyond that label. The docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical documentation. There is no OpenAPI spec, no request/response schema, and no examples available, making it difficult to determine what data or service this specific endpoint returns.","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 OpenAPI or schema documentation available — actual endpoint functionality is unclear","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no technical content","The endpoint is labeled 'Premium API Access' but what it returns is not documented","Request body format and response structure are entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/304","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/304","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 spec, no request/response schema, no documentation beyond a label, and no examples. The actual functionality of this specific endpoint is 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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':167 'addit':190 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,163 'attach':95 'avail':204 'base':8,23,51,73 'beyond':172 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67 'classif':129 'connect':185 'convers':146 'crypto-paid API' 'data':115,119,211 'determin':209 'difficult':207 'doc':176 'document':171,192 'embed':130 'endpoint':55,111,149,158,216 'estim':140 'exampl':203 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':168 'gas':139 'generat':147 'geocod':144 'header':100 'http-post' 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'key':86 'label':161,174 'learn':124 'limit':89 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'make':205 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'openapi':196 'page':180 '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':133,151,177 'prompt':187 'proof':106 'protocol':44 'quot':138 'rate':88,136 'readm':179 'render':182 'report':118 'request':37,68,155 'request/response':199 'return':64,217 'schema':200 'sentiment':125 'servic':213 'simpli':94 'spec':197 'specif':54,215 'summar':128 'technic':191 'text':127 'token':137 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':186 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"fb6d5dad-ff0f-49a5-a0da-6ff30815a4d8","listingId":"48de7585-cb92-453a-8fff-b455acecb305","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/304","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:56.802Z"}],"sources":[{"listingId":"48de7585-cb92-453a-8fff-b455acecb305","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/304","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:56.802Z","lastSeenAt":"2026-04-23T13:01:59.141Z"}],"details":{"listingId":"48de7585-cb92-453a-8fff-b455acecb305","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/304 \\\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/304"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints 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/304"}],"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 services settled in USDC on Base"],"bestFor":["Developers wanting key-free, pay-as-you-go 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 OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.315Z"},"updatedAt":"2026-04-23T13:01:59.141Z"}}