{"id":"5211fbfa-62f5-4198-baa7-bc3da05baa45","shortId":"3Qh87C","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $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 — all priced at $0.02 per request.\n\nThe specific endpoint `/api/v1/payments/134` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The platform advertises a keyless, no-rate-limit model: callers pay per request using USDC on the Base network (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge confirms a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per call. Payment is made via the `exact` scheme with a 300-second timeout.\n\nThe crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so there is no detailed API documentation, request/response schema, or usage examples available. The landing page lists sibling endpoints across analytics, AI, finance, and utility domains, all at the same $0.02 price point. Without further documentation it is unclear what this specific endpoint returns or what input it expects beyond an HTTP POST request.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api","payments"],"synonyms":["premium API","x402 endpoint","USDC API access","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No API documentation available — all doc pages return only a 'Connect wallet' prompt","The specific functionality of /api/v1/payments/134 ('Premium API Access') is not described anywhere","No request or response schema is provided beyond the x402 outputSchema stub","The platform lists many endpoints but none have documented input/output contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/134","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/payments/134","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, no request/response schema, and the specific functionality of this endpoint is undescribed. All doc pages return only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,70,136,200 '000':126 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20':125 '300':148 '6':131 'Base network API' 'USDC API access' 'access':7,22,38,81 'across':189 'advertis':98 'ai':58,191 'analyt':57,190 'api':6,21,37,80,156,175 'asset':116 'avail':182 'base':9,24,114,127 'beyond':93,219 'call':4,19,138 'caller':106 'categori':66 'challeng':85,120 'confirm':121 'connect':163 'content':169 'crawl':152 'data':56 'decim':132 'detail':174 'doc':155 'document':92,153,176,205 'domain':195 'endpoint':32,49,75,188,212 'equal':135 'exact':88,144 'exampl':181 'expect':218 'financ':61,192 'function':89 'http':221 'http-post' 'infrastructur':64 'input':216 'keyless':100 'label':78,95 'land':184 'learn':60 'limit':104 'list':186 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'made':141 'mani':48 'maxamountrequir':123 'model':105 'network':115 'no-api-key' 'no-rate-limit':101 'offer':50 'one':46 'page':154,185 'pay':2,17,107 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,139 'per':3,18,71,108,137 'platform':53,97 'point':202 'post':222 'premium':5,20,36,79 'premium API' 'price':68,157,201 'prompt':165 'protocol':43 'provid':35 'rate':103 'readm':158 'request':72,109,223 'request/response':177 'return':160,213 'schema':178 'scheme':145 'second':149 'sibl':187 'span':55 'specif':74,211 'substant':168 'timeout':150 'unclear':208 'unit':128 'usag':180 'usdc':15,30,111,134 'usdc-base' 'use':110 'util':65,194 'via':10,25,39,142 'wallet':164 'web3':62 'without':203 'x402':11,26,41,84,119 'x402 endpoint' 'x402-payment'","prices":[{"id":"582ca07d-b83d-4402-89fc-9c204a9a710c","listingId":"5211fbfa-62f5-4198-baa7-bc3da05baa45","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/payments/134","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:31.698Z"}],"sources":[{"listingId":"5211fbfa-62f5-4198-baa7-bc3da05baa45","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/134","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:31.698Z","lastSeenAt":"2026-04-22T10:31:47.760Z"}],"details":{"listingId":"5211fbfa-62f5-4198-baa7-bc3da05baa45","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/134 \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/134"},{"claim":"All endpoints are priced at $0.02 per 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/payments/134"},{"claim":"Documentation, API, pricing, and README pages all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium API resource with per-call USDC micropayments on Base","Demonstrating x402 payment protocol integration for agent-to-agent commerce","Keyless API consumption without signup or rate limits"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC micropayments on Base","Use cases requiring no-signup, no-rate-limit API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring free or fiat-only payment methods","High-volume workloads where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.646Z"},"updatedAt":"2026-04-22T10:31:47.760Z"}}