{"id":"75d207d1-c545-4867-ba95-69616fabb917","shortId":"H66eDP","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/113` is labeled \"Premium API Access\" in the x402 challenge 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 wallet 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 further technical detail, so the actual request/response schemas for this or any endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-method","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["The exact functionality of /api/v1/payments/113 ('Premium API Access') is undocumented and unclear.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no usable content.","No request or response schema is available for any endpoint on this platform.","The platform lists many endpoints but none have documented input/output contracts."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/113","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/113","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and the purpose of this specific endpoint ('Premium API Access') is entirely opaque. Docs pages all return only 'Connect wallet' with no content. This is effectively a stub 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'/request':13,28 '0.02':12,27,81,154,206 '000':143 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':171 '0x8335':148 '20':142 '2913':149 '300':174 '6':158 'Base network API' 'USDC micropayment API' 'accept':132 'access':7,22,38,110 'actual':228 'address':170 'advertis':180 'ai':68 'analysi':184 'analyt':67 'api':6,21,37,64,93,109 'base':9,24,89,144,151 'beyond':122 'broader':178 'call':4,19 'catalog':58 'challeng':114,127 'classif':187 'commit':100 'confirm':128 'connect':218 'convers':199 'data':66 'decim':159 'detail':225 'doc':212 'document':121,210 'embed':188 'endpoint':32,49,77,104,181,235 'equal':153 'estim':196 'exact':117,166 'exchang':191 'feed':190 'financ':71 'function':118 'gas':195 'generat':201 'geocod':197 'given':155 'host':56 'howev':209 'infrastructur':74 'key':94 'label':107,124 'learn':70 'limit':97 'live':131 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':162 'mani':48 'network':90 'no-api-key' 'no-rate-limit' 'offer':50 'one':46 'page':211 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,138,160 'per':3,18,62,82 'platform':54,179 'point':208 'post':133 'post-method' 'premium':5,20,36,108 'price':79,189,207,213 'prompt':220 'protocol':43 'provid':35 'quot':194 'rate':96,192 'readm':214 'remain':236 'request':63,83,134 'request/response':229 'requir':101,136 'return':215 'schema':230 'scheme':167 'second':175 'sentiment':183 'settl':84 'span':65 'specif':103 'summar':186 'technic':224 'text':185 'timeout':176 'token':193 'unit':145 'unknown':237 'usdc':15,30,86,147,156 'usdc-base' 'util':75 'valid':198 'via':10,25,39,163 'wallet':169,219 'web3':72 'x402':11,26,41,113,126,165 'x402 premium API' 'x402-payment'","prices":[{"id":"4dca0d1e-bf29-4a60-825d-f2b177b13333","listingId":"75d207d1-c545-4867-ba95-69616fabb917","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/113","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:20.869Z"}],"sources":[{"listingId":"75d207d1-c545-4867-ba95-69616fabb917","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/113","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:20.869Z","lastSeenAt":"2026-04-23T19:01:17.103Z"}],"details":{"listingId":"75d207d1-c545-4867-ba95-69616fabb917","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/113 \\\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 a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/113"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/113"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to a multi-category API platform"],"bestFor":["Developers or agents wanting zero-commitment, pay-per-call API access","x402-compatible clients on the Base network","Use cases requiring no rate limits and instant access without signup"],"notFor":["Users needing detailed API documentation or well-defined request/response schemas","Applications requiring non-crypto payment methods","High-volume use cases where per-request pricing may be inefficient compared to subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:10.144Z"},"updatedAt":"2026-04-23T19:01:17.103Z"}}