{"id":"6711274a-c925-40f6-9574-7b73a9badc32","shortId":"AeNZXS","kind":"x402","title":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It accepts POST requests and requires a per-call payment of 20,000 base units of USDC (USD Coin, 6 decimals) on the Base network, which equates to $0.02 per request. The endpoint is live and returns a standard 402 challenge when called without payment.\n\nThe broader lowpaymentfee.com 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. The platform emphasizes no API keys, no rate limits, instant access, and settlement on the Base network.\n\nThis specific endpoint (/api/v1/transfers/166) is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. There is no OpenAPI schema, no detailed documentation, and no example request/response bodies available from the crawled pages. The docs, API, pricing, and README pages all only show a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","per-call-billing","usdc-settlement","base-network","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["pay-per-call API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages only show 'Connect wallet'","Exact functionality of /api/v1/transfers/166 is unclear; 'Premium API Access' is not descriptive","No OpenAPI schema or example payloads available","No information on what data is returned after successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/166","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/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example requests or responses, and the exact functionality behind 'Premium API Access' at /api/v1/transfers/166 is undefined. The docs pages are empty beyond a wallet connect 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'/request':15,32,144 '0.02':14,31,77,143 '000':61 '20':60 '402':88 '6':68 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,24,42,157,172 'addit':217 'advertis':98 'ai':110 'analysi':114 'analyt':104 'api':6,23,41,100,151,171,203 'avail':196 'base':9,26,62,72,162 'base-network' 'beyond':180 'bodi':195 'broader':95 'call':4,21,57,91 'categori':101 'challeng':89 'classif':117 'coin':67 'connect':212 'content':218 'convers':134 'crawl':199 'crypto-paid API' 'data':103,107 'decim':69 'detail':189 'doc':202 'document':179,190 'embed':118 'emphas':149 'endpoint':36,81,137,166 'equat':75 'estim':128 'exact':175 'exampl':193 'exchang':123 'export':108 'feed':122 'financ':119 'function':176 'gas':127 'generat':135 'geocod':132 'includ':102 'infrastructur':130 'insight':109 'instant':156 'key':152 'label':169,182 'learn':112 'limit':155 'list':139 'live':83 'lowpaymentfee' 'lowpaymentfee.com':38,96 'machin':111 'metric':105 'multipl':99 'network':73,163 'no-api-key' 'openapi':186 'page':200,207 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'payment':46,58,93 'per':3,20,56,78 'per-cal':55 'per-call-billing' 'platform':97,148 'point':146 'post':50 'post-endpoint' 'premium':5,22,40,170 'premium API access' 'price':121,145,204 'prompt':214 'protocol':12,29,47 'provid':39 'quot':126 'rate':124,154 'readm':206 'report':106 'request':51,79 'request/response':194 'requir':53 'return':85 'schema':187 'sentiment':113 'settlement':159 'show':210 'specif':165 'standard':87 'summar':116 'text':115 'token':125 'unit':63 'usd':66 'usdc':17,34,65 'usdc-settlement' 'util':131 'valid':133 'via':10,27,43 'wallet':213 'web3':120 'without':92 'x402':11,28,45 'x402 endpoint' 'x402-payment'","prices":[{"id":"cab2e39a-4bee-4c1c-900e-6bfc1e24e3a0","listingId":"6711274a-c925-40f6-9574-7b73a9badc32","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/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:30.672Z"}],"sources":[{"listingId":"6711274a-c925-40f6-9574-7b73a9badc32","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/166","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:30.672Z","lastSeenAt":"2026-04-22T05:31:46.340Z"}],"details":{"listingId":"6711274a-c925-40f6-9574-7b73a9badc32","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/166 \\\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":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/166"},{"claim":"Platform lists APIs at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/166"}],"useCases":["Accessing premium API services without traditional API key registration","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-use endpoints into autonomous agent workflows"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle payments via x402 protocol on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring free or subscription-based access without per-call costs","Developers not set up for USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.82Z"},"updatedAt":"2026-04-22T05:31:46.340Z"}}