{"id":"1de3204e-7a64-414a-96b8-dbdcead9b7bf","shortId":"UJQEJt","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific resource `/api/v1/transfers/197` accepts POST requests and charges 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. Payment is settled on-chain with no API keys, no rate limits, and instant access.\n\nThe broader lowpaymentfee.com platform offers a suite of pay-per-call APIs spanning 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 uniformly at $0.02 per request.\n\nThe specific functionality of the `/api/v1/transfers/197` endpoint is not documented beyond its title \"Premium API Access.\" There is no OpenAPI spec, no request/response schema documentation, and the crawled docs/pricing/README pages only show a wallet-connect prompt. The endpoint is confirmed live (returns a valid 402 challenge), but what data or service it returns after payment is unclear.","tags":[],"capabilities":["x402-payment","pay-per-call","usdc-settlement","base-network","no-api-key","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-request API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available for this specific endpoint's functionality or response format","Crawled docs, pricing, and README pages only display a wallet-connect prompt with no content","The purpose of '/api/v1/transfers/197' is unclear — 'Premium API Access' is generic","No OpenAPI schema or example responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/197","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/197","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge, but there is no documentation of what it actually returns, no OpenAPI spec, no request/response examples, and the crawled pages are mostly empty wallet-connect prompts. The specific purpose of '/transfers/197' is 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'/request':13,28 '0.02':12,27,71,143 '000':58 '0x8335':63 '20':57 '2913':64 '402':191 '6':67 'Base network API' 'USDC micropayment endpoint' 'accept':52 'access':7,22,38,89,161 'ai':111 'analysi':115 'analyt':105 'api':6,21,37,82,102,160 'base':9,24,46,59,66 'base-network' 'beyond':156 'broader':91 'call':4,19,101 'chain':79 'challeng':192 'charg':56 'classif':118 'confirm':186 'connect':181 'convers':135 'crawl':173 'crypto-paid API' 'data':104,108,195 'decim':68 'docs/pricing/readme':174 'document':155,170 'embed':119 'endpoint':32,138,152,184 'equal':70 'estim':129 'exchang':124 'export':109 'feed':123 'financ':120 'function':148 'gas':128 'generat':136 'geocod':133 'infrastructur':131 'insight':110 'instant':88 'key':83 'learn':113 'limit':86 'live':187 'lowpaymentfee' 'lowpaymentfee.com':34,92 'machin':112 'metric':106 'network':47 'no-api-key' 'offer':94 'on-chain':77 'openapi':165 'page':175 'pay':2,17,99 'pay-per-cal':1,16,98 'pay-per-call' 'pay-per-request API' 'payment':42,74,201 'per':3,18,72,100,144 'platform':93 'post':53 'post-method' 'premium':5,20,36,159 'price':122,140 'prompt':182 'protocol':43 'provid':35 'quot':127 'rate':85,125 'report':107 'request':54,73,145 'request/response':168 'resourc':50 'return':188,199 'schema':169 'sentiment':114 'servic':197 'settl':76 'show':177 'span':103 'spec':166 'specif':49,147 'suit':96 'summar':117 'text':116 'titl':158 'token':126 'unclear':203 'uniform':141 'unit':60 'usdc':15,30,62 'usdc-settlement' 'util':132 'valid':134,190 'via':10,25,39 'wallet':180 'wallet-connect':179 'web3':121 'x402':11,26,41 'x402 API' 'x402-payment'","prices":[{"id":"2c376811-17f2-4735-bcdb-99031eb359f5","listingId":"1de3204e-7a64-414a-96b8-dbdcead9b7bf","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/197","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:45.803Z"}],"sources":[{"listingId":"1de3204e-7a64-414a-96b8-dbdcead9b7bf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/197","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:45.803Z","lastSeenAt":"2026-04-22T15:32:21.281Z"}],"details":{"listingId":"1de3204e-7a64-414a-96b8-dbdcead9b7bf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/197 \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","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","source_url":"https://lowpaymentfee.com/api/v1/transfers/197"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/197"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource without needing an API key or subscription","Agent-driven workflows that pay per call using on-chain USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-as-you-go API access","Users who prefer on-chain micropayments over traditional billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone requiring off-chain or fiat payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.12Z"},"updatedAt":"2026-04-22T15:32:21.281Z"}}