{"id":"110705f4-9fe2-4153-9b97-12b0a5d22f6b","shortId":"m2wpqy","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/162` is one of many API endpoints offered by this provider, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.\n\nThe endpoint accepts POST requests and requires an X-PAYMENT header containing a valid x402 payment proof. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The provider advertises no API keys, no rate limits, and instant access — a pure pay-per-request model.\n\nThe specific functionality of the `/api/v1/transfers/162` endpoint is not documented beyond the generic label \"Premium API Access.\" The provider's landing page lists numerous endpoints across analytics, AI/ML, finance, and utility categories, all priced at $0.02 per request. Documentation pages (docs, pricing, README) appear to require wallet connection and did not yield substantive content during crawl. Without further documentation, the exact input/output schema for this particular endpoint remains unknown.","tags":[],"capabilities":["x402-payment","base-network","usdc-settlement","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The exact functionality of /api/v1/transfers/162 is undocumented — 'Premium API Access' is a generic label","Documentation pages require wallet connection and yielded no content during crawl","No input or output schema available beyond the x402 challenge metadata","This endpoint's purpose is unclear relative to the provider's other categorized endpoints"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/162","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/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what this specific endpoint does, no input/output schema, and no example responses. The generic label 'Premium API Access' provides no functional 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'/request':16,34 '0.02':15,33,117,177 '000':113 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':106 '20':112 '6':121 'Base network API' 'USDC micropayment endpoint' 'accept':80 'access':7,25,44,134,158 'across':167 'advertis':125 'ai':70 'ai/ml':169 'analyt':69,168 'api':6,24,43,58,127,157 'appear':185 'base':9,27,101,114 'base-network' 'beyond':152 'call':4,22 'categori':66,173 'connect':189 'contain':90 'content':195 'contract':105 'cost':110 'crawl':197 'crypto-paid API' 'data':68 'decim':122 'doc':182 'document':151,180,200 'endpoint':38,52,59,79,148,166,208 'exact':202 'financ':73,170 'function':144 'generic':154 'given':118 'header':89 'i.e':116 'includ':67 'infrastructur':76 'input/output':203 'instant':133 'key':128 'label':155 'land':162 'learn':72 'limit':131 'list':164 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':71 'mani':57 'maximum':109 'model':141 'network':10,28,102 'no-api-key' 'numer':165 'offer':60 'one':55 'page':163,181 'particular':207 'pay':2,20,138 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':137 'payment':48,88,94,96 'per':3,21,139,178 'post':81 'post-method' 'premium':5,23,42,156 'premium API access' 'price':175,183 'proof':95 'protocol':13,31,49 'provid':41,63,124,160 'pure':136 'rate':130 'readm':184 'remain':209 'request':82,140,179 'requir':84,187 'schema':204 'settl':98 'span':65 'specif':51,143 'substant':194 'unit':115 'unknown':210 'usdc':18,36,104,119 'usdc-settlement' 'use':103 'util':77,172 'valid':92 'via':11,29,45 'wallet':188 'web3':74 'without':198 'x':87 'x-payment':86 'x402':12,30,47,93 'x402 API' 'x402-payment' 'yield':193","prices":[{"id":"3a800dd3-79c0-4b0e-b770-0b7662740b00","listingId":"110705f4-9fe2-4153-9b97-12b0a5d22f6b","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/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:34.987Z"}],"sources":[{"listingId":"110705f4-9fe2-4153-9b97-12b0a5d22f6b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/162","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:34.987Z","lastSeenAt":"2026-04-22T11:32:28.309Z"}],"details":{"listingId":"110705f4-9fe2-4153-9b97-12b0a5d22f6b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/162 \\\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":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/162"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/162"},{"claim":"Provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services without traditional API key registration","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-request services into autonomous agent workflows"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without Base network USDC wallets"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.657Z"},"updatedAt":"2026-04-22T11:32:28.309Z"}}