{"id":"1b66c1bd-9efa-48cb-8fd4-ed7952fa2d7a","shortId":"MNDpTg","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific endpoint `/api/v1/transfers/11` accepts POST requests and charges 20,000 base units of USDC (USD Coin, 6 decimals) on the Base network, which equals $0.02 per request. Payment is handled inline via the X-PAYMENT header with no API keys or rate limits required.\n\nThe broader lowpaymentfee.com platform offers 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 priced uniformly at $0.02 per request.\n\nThe specific functionality of the `/api/v1/transfers/11` endpoint is not documented beyond the generic \"Premium API Access\" label. No request/response schema, parameter documentation, or example payloads are available from the crawled material. The endpoint is live and returns a valid x402 challenge, settling payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","no-rate-limit","http-post"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API","permissionless API"],"warnings":["The specific functionality of /api/v1/transfers/11 is undocumented — 'Premium API Access' is a generic label with no detail on inputs or outputs.","Documentation pages (/docs, /api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'.","No OpenAPI spec, no request/response schema, and no example payloads are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/11","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/11","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 on what the /transfers/11 endpoint actually does, no request/response schema, and no examples. The 'Premium API Access' label is entirely generic. Docs, pricing, and README pages all just show 'Connect wallet' with no useful 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'/request':16,34 '0.02':15,33,75,144 '000':60 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':192 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':198 '20':59 '6':67 'Base network API' 'USDC micropayment endpoint' 'accept':54 'access':7,25,44,162 'address':191 'ai':112 'analysi':116 'analyt':106 'api':6,24,43,90,102,161 'avail':173 'base':9,27,61,71,196 'base-network' 'beyond':157 'broader':97 'call':4,22 'categori':103 'challeng':187 'charg':58 'classif':119 'coin':66 'contract':197 'convers':136 'crawl':176 'crypto-paid API' 'data':105,109 'decim':68 'document':156,168 'embed':120 'endpoint':38,52,139,153,179 'equal':74 'estim':130 'exampl':170 'exchang':125 'export':110 'feed':124 'financ':121 'function':149 'gas':129 'generat':137 'generic':159 'geocod':134 'handl':80 'header':87 'http-post' 'includ':104 'infrastructur':132 'inlin':81 'insight':111 'key':91 'label':163 'learn':114 'limit':94 'live':181 'lowpaymentfee' 'lowpaymentfee.com':40,98 'machin':113 'materi':177 'metric':107 'multipl':101 'network':10,28,72 'no-api-key' 'no-rate-limit' 'offer':100 'paramet':167 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payload':171 'payment':48,78,86,189 'per':3,21,76,145 'permissionless API' 'platform':99 'post':55 'premium':5,23,42,160 'price':123,141 'protocol':13,31,49 'provid':41 'quot':128 'rate':93,126 'report':108 'request':56,77,146 'request/response':165 'requir':95 'return':183 'schema':166 'sentiment':115 'settl':188 'specif':51,148 'summar':118 'text':117 'token':127 'uniform':142 'unit':62 'usd':65 'usdc':18,36,64,194 'usdc-settlement' 'use':193 'util':133 'valid':135,185 'via':11,29,45,82 'web3':122 'x':85 'x-payment':84 'x402':12,30,47,186 'x402 API' 'x402-payment'","prices":[{"id":"db603a73-0b15-4e20-8018-d04e6582ddc9","listingId":"1b66c1bd-9efa-48cb-8fd4-ed7952fa2d7a","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:25.794Z"}],"sources":[{"listingId":"1b66c1bd-9efa-48cb-8fd4-ed7952fa2d7a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:25.794Z","lastSeenAt":"2026-04-22T11:32:27.787Z"}],"details":{"listingId":"1b66c1bd-9efa-48cb-8fd4-ed7952fa2d7a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/11 \\\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 a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/11"},{"claim":"All endpoints priced at $0.02 per request 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/transfers/11"}],"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 instant API access without signup or subscriptions","AI agents that need permissionless, pay-as-you-go API consumption","Users already holding USDC on Base network"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.091Z"},"updatedAt":"2026-04-22T11:32:27.787Z"}}