{"id":"c2b7c8e0-a8fc-43f6-a48d-83013c892994","shortId":"ECEYVa","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 is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. The specific endpoint `/api/v1/transfers/101` is listed under the platform's x402-gated services, accepting POST requests and settling payments in USDC on the Base network.\n\nThe platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access. The x402 challenge confirms the endpoint is live, requiring payment of up to 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, which has 6 decimals), equating to $0.02 per call. The payment scheme is \"exact\" with a 300-second timeout window.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. The specific functionality of the `/api/v1/transfers/101` endpoint is unclear from available material; the name \"Premium API Access\" and the path segment \"transfers\" suggest it may relate to a transfer or transaction operation, but no input/output schema details are documented beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["infrastructure","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API","402 payment protocol"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","The specific functionality of /api/v1/transfers/101 is unknown; 'Premium API Access' is a generic label","No input schema or response examples are documented","The platform lists many endpoints but provides no technical details for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/101","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/101","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 via a valid 402 challenge with clear pricing, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. The specific functionality of /api/v1/transfers/101 is undocumented, no input/output schemas are provided, and no example responses are 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'/request':15,32 '0.02':14,31,102,147 '000':133 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':138 '20':132 '300':157 '402 payment protocol' '6':143 'Base network API' 'USDC micropayment endpoint' 'accept':85 'access':7,24,42,118,199 'across':105 'advertis':99 'ai':62 'analyt':61 'api':6,23,41,111,167,198 'avail':193 'base':9,26,95,134,140 'base-network' 'beyond':222 'call':4,21,149 'categori':70 'challeng':121,225 'confirm':122 'connect':176 'content':182 'crypto-paid API' 'data':60 'decim':144 'detail':219 'doc':166 'document':161,221 'endpoint':36,53,73,108,124,189 'equat':145 'exact':154 'extrem':163 'financ':65 'flat':101 'function':185 'gate':83 'infrastructur':68 'input/output':217 'instant':117 'key':112 'learn':64 'limit':115 'list':76 'live':126 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':63 'mani':52 'materi':194 'may':207 'metadata':226 'name':196 'network':96 'no-api-key' 'offer':54 'one':50 'oper':214 'page':171 'path':202 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':46,90,128,151 'per':3,20,103,148 'platform':57,79,98 'post':86 'post-method' 'premium':5,22,40,197 'price':168 'prompt':178 'protocol':12,29,47 'provid':39 'rate':114 'readm':170 'relat':208 'render':173 'request':87,104 'requir':127 'schema':218 'scheme':152 'second':158 'segment':203 'servic':84 'settl':89 'span':59 'spars':164 'specif':72,184 'suggest':205 'timeout':159 'transact':213 'transfer':204,211 'unclear':191 'unit':135 'usdc':17,34,92,137 'usdc-settlement' 'util':69 'via':10,27,43 'wallet':177 'web3':66 'window':160 'x402':11,28,45,82,120,224 'x402 API' 'x402-gated':81 'x402-payment'","prices":[{"id":"f2865ac4-0a0f-47e1-8acc-30409ca39420","listingId":"c2b7c8e0-a8fc-43f6-a48d-83013c892994","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/101","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:25.179Z"}],"sources":[{"listingId":"c2b7c8e0-a8fc-43f6-a48d-83013c892994","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/101","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:25.179Z","lastSeenAt":"2026-04-23T21:32:45.559Z"}],"details":{"listingId":"c2b7c8e0-a8fc-43f6-a48d-83013c892994","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/101 \\\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 up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/101"},{"claim":"Platform advertises $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/101"}],"useCases":["Programmatic access to a transfer-related API without pre-registration or API keys","Agent-driven workflows that need instant, keyless API access settled in USDC","Demonstrating x402 payment protocol integration on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-use API access on Base","Low-volume callers who prefer per-request billing over subscriptions"],"notFor":["Users who need detailed API documentation before integrating","High-volume use cases where $0.02/request adds up significantly","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.132Z"},"updatedAt":"2026-04-23T21:32:45.559Z"}}