{"id":"72b6ace1-bb50-4208-9076-160e980e901d","shortId":"KMsGdn","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/charges/365` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader lowpaymentfee.com site offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. However, the specific endpoint being listed here (`/api/v1/charges/365`) is labeled generically as \"Premium API Access\" and does not appear in the site's public endpoint catalog, so its exact functionality is unclear.\n\nPayments settle on the Base L2 network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The x402 challenge specifies a 300-second timeout and uses the \"exact\" payment scheme. Documentation pages on the site (docs, pricing, README) all appear to require wallet connection and contain no readable content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The endpoint /api/v1/charges/365 is not listed in the site's public API catalog — its actual functionality is unknown.","All documentation pages (docs, pricing, README, api) return only 'Connect wallet' with no readable content.","No OpenAPI spec or request/response schema is available; integration requires trial and error.","The exact data or service returned by this endpoint cannot be verified from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/365","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/charges/365","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 the specific functionality of /api/v1/charges/365 is undocumented. No OpenAPI schema, no request/response examples, and all documentation pages require wallet connection with no readable content. The endpoint doesn't appear in the site's public 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'/request':13,28,158 '0.02':12,27,78,157 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':202 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':208 '20':71 '300':214 '402':66 '6':82 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,97,175 'across':114 'address':201 'advertis':88 'ai':124 'analysi':128 'analyt':118 'api':5,20,38,61,90,174 'appear':179,232 'attach':100 'base':8,23,51,73,197 'broader':109 'call':4,19,85 'catalog':186 'categori':116 'challeng':67,211 'classif':131 'connect':236 'contain':238 'content':241 'contract':206 'convers':148 'crypto-paid API' 'data':117,121 'decim':83 'doc':228 'document':223 'embed':132 'endpoint':55,113,151,164,185 'estim':142 'exact':189,220 'exchang':137 'export':122 'feed':136 'financ':133 'four':115 'function':190 'gas':141 'generat':149 'generic':171 'geocod':146 'given':79 'header':104 'howev':161 'http-post' 'i.e':77 'infrastructur':144 'insight':123 'instant':96 'key':91 'l2':198 'label':170 'learn':126 'limit':94 'list':58,153,166 'lowpaymentfee' 'lowpaymentfee.com':31,110 'machin':125 'metric':119 'network':9,24,52,199 'no-api-key' 'offer':112 'page':224 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,103,193,221 'per':3,18,36,84 'platform':6,21,39,87 'point':160 'premium':60,173 'premium API access' 'price':135,159,229 'protocol':44 'public':184 'quot':140 'rate':93,138 'readabl':240 'readm':230 'report':120 'request':37,68,107 'requir':234 'return':64 'scheme':222 'second':215 'sentiment':127 'settl':194 'simpli':99 'site':111,182,227 'specif':54,163 'specifi':212 'summar':130 'text':129 'timeout':216 'token':139 'unclear':192 'unit':74 'usdc':15,30,47,76,80,205 'usdc-base-network' 'use':41,203,218 'util':145 'valid':147 'via':10,25 'wallet':235 'web3':134 'x402':11,26,43,102,210 'x402 API' 'x402-payment'","prices":[{"id":"b2169039-c930-43c9-a2c0-990928375a92","listingId":"72b6ace1-bb50-4208-9076-160e980e901d","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/charges/365","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:07.856Z"}],"sources":[{"listingId":"72b6ace1-bb50-4208-9076-160e980e901d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/365","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:07.856Z","lastSeenAt":"2026-04-24T11:32:06.938Z"}],"details":{"listingId":"72b6ace1-bb50-4208-9076-160e980e901d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/365 \\\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 x402 challenge requests maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/365"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/365"},{"claim":"The site lists all endpoints at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to paid endpoints without subscription or signup"],"bestFor":["Developers or agents who want frictionless pay-per-call access without API keys","Users already holding USDC on the Base network","Low-volume or sporadic API consumers who prefer no commitments"],"notFor":["Users who need detailed documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base L2 network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.471Z"},"updatedAt":"2026-04-24T11:32:06.938Z"}}