{"id":"a061a873-12ad-403a-904d-ebc956f903d6","shortId":"6fXwec","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/293` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) 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 platform 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.\n\nHowever, the specific endpoint being listed here (`/api/v1/charges/293`) is labeled only as \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The actual behavior behind this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto-payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content.","The endpoint path '/api/v1/charges/293' does not appear in the site's listed API catalog, so its actual functionality is unknown.","No OpenAPI schema or request/response examples are available.","No information about what 'Premium API Access' actually provides or returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/293","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/293","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 zero documentation about what this specific endpoint actually does or returns. No OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,169 'across':108 'actual':218 'addit':199 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,168,185 'attach':95 'avail':213 'base':8,23,51,73 'behavior':219 'behind':220 'broader':104 'call':4,19,80 'categori':110 'challeng':67 'classif':125 'connect':194 'content':200 'convers':142 'crawl':216 'crypto-paid endpoint' 'data':111,115,176 'detail':211 'doc':182 'document':173,212 'embed':126 'endpoint':55,107,145,158,222 'estim':136 'exampl':208 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':178 'gas':135 'generat':143 'geocod':140 'header':99 'howev':155 'http-post' 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'label':164 'learn':120 'limit':89 'list':58,147,160 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'openapi':204 'page':186 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105 'point':154 'premium':60,167 'premium API access' 'price':129,153,183 'prompt':196 'protocol':44 'quot':134 'rate':88,132 'render':191 'report':114 'request':37,68,102 'request/response':207 'return':64,180 'schema':205 'sentiment':121 'simpli':94 'site':189 'specif':54,157 'summar':124 'text':123 'token':133 'unit':74 'unknown':224 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':195 'web3':128 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"e030d567-8c8b-4696-b663-815893608ff4","listingId":"a061a873-12ad-403a-904d-ebc956f903d6","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/293","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:03.047Z"}],"sources":[{"listingId":"a061a873-12ad-403a-904d-ebc956f903d6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/293","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:03.047Z","lastSeenAt":"2026-04-22T04:01:29.737Z"}],"details":{"listingId":"a061a873-12ad-403a-904d-ebc956f903d6","quickStartSnippet":"# POST with x402 payment header\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/293 \\\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 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/charges/293"},{"claim":"The platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/charges/293"}],"useCases":["Accessing a pay-per-call API without needing API keys or subscriptions","Making micropayments for API access using USDC on Base","Agent-driven API consumption with automatic x402 payment settlement"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without USDC on the Base network","High-volume consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.734Z"},"updatedAt":"2026-04-22T04:01:29.737Z"}}