{"id":"4c03c322-a581-4beb-923e-ae83fee015f3","shortId":"Rc6Pz7","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","description":"This endpoint at `/api/v1/benefits/61` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 protocol, requiring a USDC payment on the Base network with no API keys, no rate limits, and no subscriptions — just per-call micropayments.\n\nThe specific `/api/v1/benefits/61` endpoint is labeled \"Premium API Access\" but its exact functionality is not documented in the available crawl material. The x402 challenge confirms it is live and accepts POST requests, settling in USDC (contract `0x8335…`) on Base. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing across all listed endpoints.\n\nBecause the crawled docs pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive documentation, the actual request/response schema for this endpoint is unknown. The platform advertises categories including analytics, AI inference, finance data, and utility services, but which of these `/api/v1/benefits/61` maps to is unclear. Agents should treat this as an opaque JSON endpoint until further documentation becomes available.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","json-api"],"categories":["general","api-gateway"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","USDC pay-per-call","Base network API","premium API access"],"warnings":["No documentation available — all doc pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt","The exact functionality of /api/v1/benefits/61 is unknown; 'Premium API Access' is the only label","No OpenAPI spec, no request schema, no response schema available","No examples of request or response payloads exist in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/61","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/benefits/61","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/request in USDC on Base), but there is no documentation, no request/response schema, and the purpose of '/api/v1/benefits/61' is entirely opaque. All doc pages returned only 'Connect wallet' with no 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'/api/v1/benefits/61':32,93,207 '/docs':166 '/pricing':168 '/readme':169 '/request':155 '0.02':145,154 '000':136 '0x8335':127 '20':135 '6':141 'Base network API' 'USDC pay-per-call' 'accept':120 'access':99 'across':157 'actual':182 'advertis':192 'agent':212 'ai':52,196 'amount':132 'analyt':51,195 'api':5,19,48,78,98 'avail':109,225 'base':8,22,74,129,137 'base-network' 'becom':224 'call':12,26,89 'categori':193 'challeng':114 'confirm':115 'connect':174 'consist':148 'contract':126 'crawl':110,163 'data':50,199 'decim':142 'doc':164 'document':106,180,223 'endpoint':6,20,30,61,94,160,187,220 'equal':144 'exact':102 'financ':55,198 'function':103 'gate':3,17,63 'includ':194 'infer':197 'infrastructur':58 'json':219 'json-api' 'key':79 'label':96 'learn':54 'limit':82 'list':159 'live':118 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':53 'map':208 'materi':111 'maximum':131 'micropay':90 'micropayment API' 'network':75 'no-api-key' 'offer':40 'opaqu':218 'page':165 'part':34 'pay':10,24,45 'pay-per-cal':9,23 'pay-per-request':44 'payment':71 'per':11,25,46,88,146 'per-cal':87 'platform':38,151,191 'post':121 'premium':4,18,97 'premium API access' 'price':156 'prompt':176 'protocol':67 'rate':81 'request':47,122,147 'request/response':183 'requir':68,133 'return':171 'schema':184 'servic':202 'settl':123 'span':49 'specif':92 'subscript':85 'substant':179 'suit':42 'treat':214 'unclear':211 'uniform':153 'unit':138 'unknown':189 'usdc':14,28,70,125,140 'usdc-micropayment' 'util':59,201 'via':64 'wallet':175 'web3':56 'x402':2,16,66,113 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e7792c92-74d6-40b3-8536-e03c036240c8","listingId":"4c03c322-a581-4beb-923e-ae83fee015f3","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/benefits/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:46.205Z"}],"sources":[{"listingId":"4c03c322-a581-4beb-923e-ae83fee015f3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:46.205Z","lastSeenAt":"2026-04-22T05:31:54.327Z"}],"details":{"listingId":"4c03c322-a581-4beb-923e-ae83fee015f3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/61 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/61"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/benefits/61"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for API access without subscriptions or API keys","Agent-driven workflows that need on-demand endpoint access settled in USDC","Exploring x402 protocol micropayment patterns on Base"],"bestFor":["Developers experimenting with x402 pay-per-request patterns","AI agents that can settle USDC micropayments on Base","Users who want no-commitment, no-signup API access"],"notFor":["Users needing well-documented, schema-defined API contracts","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone requiring fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.893Z"},"updatedAt":"2026-04-22T05:31:54.327Z"}}