{"id":"6d15bb7c-94b6-4f40-96df-1c8970a3a2ee","shortId":"sXFbm5","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform share the same pricing model: $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/benefits/49` is listed under the title \"Premium API Access\" but the crawled material does not clarify what data or functionality this particular route returns. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires an exact payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) all resolve but render only a \"Connect wallet\" prompt, so no detailed request/response schemas or usage guides are available. Because the actual payload and response format of this specific endpoint are undocumented, agents should treat it as an exploratory integration until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit","post-method"],"categories":["general","api-gateway"],"synonyms":["premium API","lowpaymentfee","x402 API","USDC pay-per-call","Base network API","micropayment API","benefits endpoint"],"warnings":["No documentation available — /docs, /pricing, and /README pages all render only a 'Connect wallet' prompt with no content.","The specific functionality of /api/v1/benefits/49 ('Premium API Access') is not described anywhere in the crawled material.","No request body schema or response schema is documented; agents must discover behavior empirically.","The endpoint path '/api/v1/benefits/49' does not appear in the site's listed API catalog, suggesting it may be unlisted or experimental."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/49","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/49","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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation of what this specific endpoint returns, no request/response schema, and all doc pages render only a wallet-connect prompt. The purpose of '/api/v1/benefits/49' is entirely 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'/docs':192 '/pricing':193 '/readme':194 '0.02':10,29,95,161 '000':150 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':172 '0x8335':155 '20':149 '2913':156 '300':175 '6':165 'Base network API' 'USDC pay-per-call' 'accept':140 'access':6,25,46,116,189 'actual':216 'address':171 'advertis':180 'agent':227 'ai':77 'analyt':76 'api':5,24,45,73,115,182 'avail':213 'base':8,27,103,151,158 'benefits endpoint' 'broad':66 'call':72 'catalog':67 'challeng':134 'clarifi':123 'confirm':135 'connect':201 'crawl':119 'data':75,125 'decim':166 'detail':206 'document':190,237 'endpoint':40,57,86,107,137,224 'equal':160 'exact':146 'exploratori':233 'financ':80 'format':220 'function':127 'gate':3,22 'given':162 'guid':211 'host':64 'infrastructur':83 'instant':188 'integr':234 'key':16,35,183 'learn':79 'limit':19,38,186 'list':110 'live':139 'lowpaymentfee' 'lowpaymentfee.com':42,61 'machin':78 'mani':56 'materi':120 'micropayment API' 'model':94 'network':104 'no-api-key' 'no-rate-limit' 'offer':58 'one':54 'page':191 'particular':129 'pay':9,28,70 'pay-per-cal':69 'pay-per-request' 'payload':217 'payment':50,147,167 'per':11,30,71,96 'platform':62,89,179 'post':141 'post-method' 'premium':4,23,44,114 'premium API' 'price':93 'prompt':203 'protocol':51 'provid':43 'rate':18,37,185 'render':198 'request':12,31,97,142 'request/response':207 'requir':144 'resolv':196 'respons':219 'return':131 'rout':130 'schema':208 'second':176 'sent':169 'settl':98 'share':90 'span':74 'specif':106,223 'surfac':238 'timeout':177 'titl':113 'treat':229 'undocu':226 'unit':152 'usag':210 'usdc':14,33,100,154,163 'usdc-base' 'util':84 'via':47 'wallet':202 'web3':81 'x402':2,21,49,133 'x402 API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"75c9289a-1539-4431-bf0b-767206b744af","listingId":"6d15bb7c-94b6-4f40-96df-1c8970a3a2ee","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:38.325Z"}],"sources":[{"listingId":"6d15bb7c-94b6-4f40-96df-1c8970a3a2ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:38.325Z","lastSeenAt":"2026-04-22T05:31:53.978Z"}],"details":{"listingId":"6d15bb7c-94b6-4f40-96df-1c8970a3a2ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/49 \\\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/49"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/benefits/49"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services with per-call USDC micropayments on Base","Integrating pay-as-you-go API calls into autonomous agent workflows without API key management","Exploring x402 protocol-based payment flows for machine-to-machine commerce"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-per-call API access on Base","Projects requiring low-friction micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation and guaranteed response schemas before integrating","High-throughput production workloads where undocumented endpoints pose reliability risks","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.269Z"},"updatedAt":"2026-04-22T05:31:53.978Z"}}