{"id":"f27a222a-a9e9-4093-af76-4bbb777ae07a","shortId":"Jyyejd","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/transfers/145` 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 uniformly priced at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/transfers/145` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for this or any other endpoint on the platform. The endpoint is confirmed live (402 challenge captured), but what it actually returns after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.","The specific functionality of /api/v1/transfers/145 ('Premium API Access') is completely undocumented.","No OpenAPI schema or request/response examples are available for any endpoint on the platform.","Cannot verify what data or service is returned after successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/145","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/transfers/145","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and the docs pages are empty. The label 'Premium API Access' is generic and uninformative. This is effectively a stub 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'/request':13,28 '0.02':12,27,80,152 '000':74 '20':73 '402':66,215 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,169 'actual':221 'addit':186 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,168 'attach':93 'avail':200 'base':8,23,51,75 'behind':159 'beyond':164 'broader':106 'call':4,19,82 'caller':91 'captur':217 'categori':111 'challeng':67,216 'classif':127 'confirm':213 'connect':181 'content':187 'convers':144 'crawl':171 'crypto-paid API' 'data':113,117 'detail':198 'doc':172 'document':163,199 'embed':128 'endpoint':55,147,206,211 'estim':138 'exampl':195 'exchang':133 'export':118 'feed':132 'financ':129 'function':158 'gas':137 'generat':145 'geocod':142 'header':98 'howev':155 'http-post' 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'key':85 'label':166 'learn':122 'limit':88 'list':58 'live':214 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'no-rate-limit' 'openapi':191 'page':176 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,97,103,224 'per':3,18,36,81,153 'platform':6,21,39,107,209 'premium':60,167 'premium API access' 'price':131,150,173 'prompt':183 'proof':104 'protocol':44 'quot':136 'rate':87,134 'readm':175 'report':116 'request':37,154 'request/response':194 'requir':68,90 'return':64,178,222 'schema':192 'sentiment':123 'simpli':92 'specif':54,157 'summar':126 'text':125 'token':135 'uniform':149 'unit':76 'unknown':226 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':182 'web3':130 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"5ffabd6e-e1e6-4035-9e1f-2917ffa1e710","listingId":"f27a222a-a9e9-4093-af76-4bbb777ae07a","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/transfers/145","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:37.398Z"}],"sources":[{"listingId":"f27a222a-a9e9-4093-af76-4bbb777ae07a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/145","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:37.398Z","lastSeenAt":"2026-04-23T02:01:53.177Z"}],"details":{"listingId":"f27a222a-a9e9-4093-af76-4bbb777ae07a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/145 \\\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 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/145"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/145"}],"useCases":["Accessing a premium API endpoint with per-request USDC micropayments on Base","Integrating x402-compatible agents that pay for API calls without API keys","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Projects wanting to avoid subscription commitments for API usage"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","Anyone without a Base-network USDC wallet or x402-compatible client","Production workloads requiring well-documented, schema-validated endpoints"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.542Z"},"updatedAt":"2026-04-23T02:01:53.177Z"}}