{"id":"dc9e466e-1ff6-474a-b9f1-ca8e36e31bff","shortId":"c3rBwR","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, paid in USDC on the Base network, with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/178` 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…) on Base, which equals $0.02 (USDC uses 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 are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","micropayment API"],"warnings":["The specific functionality of /api/v1/payments/178 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, README) 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 (AI, finance, utilities) but none have documented input/output contracts."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/178","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/178","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 the actual functionality behind \"Premium API Access\" is undocumented. All docs/pricing/README pages return only a wallet-connect prompt with no technical content. No request or response schemas are available, making it impossible to know what this endpoint actually 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'/request':13,28 '0.02':12,27,81,151,202 '000':141 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':167 '0x8335':146 '20':140 '300':170 '6':154 'Base network API' 'USDC API access' 'accept':130 'access':7,22,38,108 'actual':224 'address':166 'advertis':176 'ai':68 'analysi':180 'analyt':67 'api':6,21,37,64,93,107 'base':9,24,89,142,148 'beyond':120 'broader':174 'call':4,19 'catalog':58 'challeng':112,125 'classif':183 'commit':98 'confirm':126 'connect':214 'convers':195 'data':66 'decim':155 'detail':221 'doc':208 'document':119,206 'embed':184 'endpoint':32,49,77,102,177,231 'equal':150 'estim':192 'exact':115,162 'exchang':187 'feed':186 'financ':71 'function':116 'gas':191 'generat':197 'geocod':193 'host':56 'howev':205 'infrastructur':74 'key':94 'label':105,122 'learn':70 'limit':96 'live':129 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':158 'mani':48 'micropayment API' 'network':90 'no-api-key' 'offer':50 'one':46 'page':207 'paid':84 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,136,156 'per':3,18,62,82 'platform':54,175 'point':204 'post':131 'post-endpoint' 'premium':5,20,36,106 'premium API' 'price':79,185,203,209 'prompt':216 'protocol':43 'provid':35 'quot':190 'rate':95,188 'readm':210 'request':63,83,132 'request/response':225 'requir':99,134 'return':211 'schema':226 'scheme':163 'second':171 'sentiment':179 'span':65 'specif':101 'summar':182 'technic':220 'text':181 'timeout':172 'token':189 'unit':143 'unknown':233 'usdc':15,30,86,145,152 'usdc-base' 'use':153 'util':75 'valid':194 'via':10,25,39,159 'wallet':165,215 'web3':72 'x402':11,26,41,111,124,161 'x402 API' 'x402-payment'","prices":[{"id":"71a9ca6d-7995-4161-86d7-d36d6b71dcf5","listingId":"dc9e466e-1ff6-474a-b9f1-ca8e36e31bff","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/178","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:40.911Z"}],"sources":[{"listingId":"dc9e466e-1ff6-474a-b9f1-ca8e36e31bff","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/178","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:40.911Z","lastSeenAt":"2026-04-23T16:07:16.055Z"}],"details":{"listingId":"dc9e466e-1ff6-474a-b9f1-ca8e36e31bff","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/178 \\\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 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/178"},{"claim":"Price is $0.02 per request, paid in USDC on Base, with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/178"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API endpoint without needing API keys or subscriptions","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to paid services via x402 protocol"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume use cases where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.171Z"},"updatedAt":"2026-04-23T16:07:16.055Z"}}