{"id":"37405b21-3ef7-4c06-9e77-99d75784c408","shortId":"Y43vpp","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/72` 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, this specific endpoint (`/api/v1/charges/72`) is labeled generically as \"Premium API Access\" and does not appear in the site's public endpoint catalog. There is no documentation, OpenAPI schema, or example request/response available for this particular resource. The crawled docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content. Without knowing what this endpoint actually returns, callers should treat it as an opaque paid resource until further documentation is published.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment protocol"],"warnings":["No documentation available — docs, pricing, and API pages render only 'Connect wallet' with no content","This specific endpoint (/api/v1/charges/72) is not listed in the site's public API catalog","No OpenAPI schema, no request/response examples, and no description of what this endpoint actually returns","The platform's actual functionality behind these endpoints is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/72","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/72","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 402 challenge, but there is no OpenAPI schema, no documentation, no example requests or responses, and the specific endpoint /api/v1/charges/72 does not appear in the site's public catalog. The docs/pricing/API pages all render only a wallet-connect prompt with no useful 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 '402 payment protocol' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,166 'across':108 'actual':215 'addit':208 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,165,197 'appear':170 'attach':95 'avail':187 'base':8,23,51,73 'broader':104 'call':4,19,80 'caller':217 'catalog':177 'categori':110 'challeng':67 'classif':125 'connect':203 'content':209 'convers':142 'crawl':193 'data':111,115 'doc':194 'document':181,228 'embed':126 'endpoint':55,107,145,158,176,214 'estim':136 'exampl':185 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'gas':135 'generat':143 'generic':162 'geocod':140 'header':99 'howev':155 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'know':211 'label':161 'learn':120 'limit':89 'list':58,147 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'opaqu':223 'openapi':182 'page':198 'paid':224 'particular':190 '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':60,164 'price':129,153,195 'prompt':205 'protocol':44 'public':175 'publish':230 'quot':134 'rate':88,132 'render':200 'report':114 'request':37,68,102 'request/response':186 'resourc':191,225 'return':64,216 'schema':183 'sentiment':121 'simpli':94 'site':173 'specif':54,157 'summar':124 'text':123 'token':133 'treat':219 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':204 'web3':128 'without':210 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"8315392c-cf2f-4450-b4ba-fd348ce933ba","listingId":"37405b21-3ef7-4c06-9e77-99d75784c408","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/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:39.235Z"}],"sources":[{"listingId":"37405b21-3ef7-4c06-9e77-99d75784c408","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:39.235Z","lastSeenAt":"2026-04-24T10:32:39.373Z"}],"details":{"listingId":"37405b21-3ef7-4c06-9e77-99d75784c408","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/72 \\\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/72"},{"claim":"The platform lists endpoints at $0.02/request across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/72"}],"useCases":["Programmatic access to a paid API resource without traditional API key signup","Agent-driven workflows that need to pay per call using on-chain USDC","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that can autonomously pay for API calls on Base","Users who want no-signup, no-rate-limit API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone requiring free or subscription-based pricing models","Production workloads that depend on well-documented response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.878Z"},"updatedAt":"2026-04-24T10:32:39.373Z"}}