{"id":"89331e9a-772f-4d1d-991b-2f18b472f8cb","shortId":"Vw3zaF","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 lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/116` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the payTo address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this or any endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-method","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC API access","Base network API"],"warnings":["The specific functionality of /api/v1/payments/116 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no substantive content.","No request or response schema is available for this or any endpoint on the platform.","The platform lists many endpoints but none have documented input/output contracts."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/116","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/116","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but the endpoint's actual functionality (\"Premium API Access\") is completely undocumented. All doc/pricing/README pages return only a wallet-connect prompt with no content. No request or response schemas are available, making it impossible to determine what this endpoint actually 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'/request':13,28 '0.02':12,27,81,150,203 '000':139 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':168 '0x8335':144 '20':138 '2913':145 '300':171 '6':154 'Base network API' 'USDC API access' 'accept':128 'access':7,22,38,110 'actual':224 'address':167 'advertis':177 'ai':68 'analysi':181 'analyt':67 'api':6,21,37,64,93,109 'base':9,24,89,140,147 'beyond':118 'broader':175 'call':4,19 'catalog':58 'challeng':123 'classif':184 'commit':100 'confirm':124 'connect':215 'content':221 'convers':196 'data':66 'decim':155 'doc':209 'document':117,207 'embed':185 'endpoint':32,49,77,104,178,231 'equal':149 'estim':193 'exact':113,162 'exchang':188 'feed':187 'financ':71 'function':114 'gas':192 'generat':198 'geocod':194 'given':151 'host':56 'howev':206 'infrastructur':74 'key':94 'label':107,120 'learn':70 'limit':97 'live':127 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':158 'mani':48 'network':90 'no-api-key' 'no-rate-limit' 'offer':50 'one':46 'page':208 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,134,156 'payto':166 'per':3,18,62,82 'platform':54,176 'point':205 'post':129 'post-method' 'premium':5,20,36,108 'price':79,186,204,210 'prompt':217 'protocol':43 'provid':35 'quot':191 'rate':96,189 'readm':211 'request':63,83,130 'request/response':225 'requir':101,132 'return':212 'schema':226 'scheme':163 'second':172 'sentiment':180 'settl':84 'span':65 'specif':103 'substant':220 'summar':183 'text':182 'timeout':173 'token':190 'unit':141 'unknown':233 'usdc':15,30,86,143,152 'usdc-base' 'util':75 'valid':195 'via':10,25,39,159 'wallet':216 'web3':72 'x402':11,26,41,122,161 'x402 premium API' 'x402-payment'","prices":[{"id":"2e0e6a1a-f734-4c1e-bec3-a594868084dc","listingId":"89331e9a-772f-4d1d-991b-2f18b472f8cb","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/116","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:22.695Z"}],"sources":[{"listingId":"89331e9a-772f-4d1d-991b-2f18b472f8cb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/116","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:22.695Z","lastSeenAt":"2026-04-23T19:01:17.182Z"}],"details":{"listingId":"89331e9a-772f-4d1d-991b-2f18b472f8cb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/116 \\\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":"Endpoint returns 402 with x402 challenge confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/payments/116"},{"claim":"Price is $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on Base network with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/payments/116"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to a multi-category API platform"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible clients on the Base network","Low-volume or exploratory API usage without subscription commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:10.018Z"},"updatedAt":"2026-04-23T19:01:17.182Z"}}