{"id":"1d9f3335-fcd8-4990-b3e5-fa57e0936cd0","shortId":"GX6eyM","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a catalog of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request settled in USDC on Base.\n\nThe specific endpoint `/api/v1/benefits/19` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The platform advertises no API keys, no rate limits, and instant access via x402 payment headers. The x402 challenge confirms the endpoint is live, accepts POST requests, requires up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call, and pays out to a specified Ethereum address.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this particular endpoint returns. Prospective callers should be aware that without documentation, the actual behavior of this endpoint is unknown beyond its payment parameters.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","micropayment api","pay-per-call api","USDC api access","Base network api","premium api"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The exact functionality of /api/v1/benefits/19 is unknown; 'Premium API Access' is the only descriptor","No OpenAPI schema or request/response examples provided","No information on what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/19","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does, no request/response schema, and no examples. The label 'Premium API Access' is generic and uninformative. This is effectively a stub 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'0.02':10,24,80,148 '000':142 '20':141 '6':152 'Base network api' 'USDC api access' 'accept':135 'access':6,20,36,96,122 'actual':215 'address':163 'advertis':113 'ai':69 'analyt':68 'api':5,19,35,65,95,115,170 'awar':210 'base':8,22,43,87,143 'base-network' 'behavior':216 'behind':37 'beyond':108,222 'call':64,155 'caller':207 'catalog':59 'challeng':100,129 'confirm':130 'connect':179 'content':185 'data':67,199 'decim':153 'descript':196 'doc':169 'document':107,164,213 'endpoint':30,50,90,132,204,219 'ethereum':162 'exact':103 'exampl':193 'extrem':166 'financ':72 'function':104,201 'gate':3,17 'given':149 'header':126 'host':57 'i.e':147 'infrastructur':75 'instant':121 'key':116 'label':93,110 'learn':71 'limit':119 'live':134 'lowpaymentfee' 'lowpaymentfee.com':32,54 'machin':70 'mani':49 'micropayment api' 'network':44 'no-api-key' 'offer':51 'one':47 'openapi':189 'page':174 'paramet':225 'particular':203 'pay':9,23,62,157 'pay-per-cal':61 'pay-per-call api' 'pay-per-request' 'payment':125,224 'paywal':40 'per':11,25,63,81,154 'platform':55,112 'post':136 'post-method' 'premium':4,18,34,94 'premium api' 'price':78,171 'prompt':181 'prospect':206 'provid':33 'rate':118 'readm':173 'render':176 'request':12,26,82,137 'request/response':192 'requir':138 'return':205 'schema':190 'settl':83 'span':66 'spars':167 'specif':89 'specifi':161 'unit':144 'unknown':221 'usdc':14,28,85,146,150 'usdc-settlement' 'util':76 'via':123 'wallet':180 'web3':73 'without':212 'x402':2,16,39,99,124,128 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"7d48eac5-9a6b-4196-9850-80c56bc83b89","listingId":"1d9f3335-fcd8-4990-b3e5-fa57e0936cd0","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:37.099Z"}],"sources":[{"listingId":"1d9f3335-fcd8-4990-b3e5-fa57e0936cd0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:37.099Z","lastSeenAt":"2026-04-22T01:01:58.334Z"}],"details":{"listingId":"1d9f3335-fcd8-4990-b3e5-fa57e0936cd0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/19 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/19"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/benefits/19"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC on Base for per-call API access","Use cases requiring no-signup, no-API-key access"],"notFor":["Users who need documented request/response schemas before integrating","High-volume use cases where $0.02/request adds up without volume discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.389Z"},"updatedAt":"2026-04-22T01:01:58.334Z"}}