{"id":"158c59a3-5a1d-4ce8-b493-a6aaa59eee40","shortId":"6Q7RF5","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","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/37` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — each request is paid individually via an X-PAYMENT header.\n\nThe broader platform advertises multiple API categories including 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 and settle in USDC on Base.\n\nHowever, the specific endpoint being listed here (`/api/v1/charges/37`) 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. Without schema details or example responses, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet'","The specific endpoint /api/v1/charges/37 has no description of what it returns or what input it expects","No OpenAPI schema or example responses are provided","The endpoint path '/charges/37' does not match any of the advertised API categories on the homepage, making its purpose unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/37","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns 402 as expected for x402), and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the docs pages are empty ('Connect wallet' only). The specific functionality of /api/v1/charges/37 is completely undocumented — it's unclear what 'Premium API Access' actually 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'/request':13,30,151 '0.02':12,29,69,150 '000':73 '20':72 '6':79 'Base network API' 'USDC API' 'accept':50 'access':66,174 'actual':213 'addit':204 'advertis':105 'ai':117 'analysi':121 'analyt':111 'api':5,15,22,32,42,65,82,107,173,190 'base':8,25,55,74,159 'behavior':214 'broader':103 'call':4,21,71 'categori':108 'classif':124 'commit':88 'connect':199 'content':205 'convers':141 'cost':68 'data':110,114,181 'decim':80 'detail':208 'doc':187 'document':178 'embed':125 'endpoint':59,144,163,217 'estim':135 'exampl':210 'exchang':130 'export':115 'feed':129 'financ':126 'function':183 'gas':134 'generat':142 'geocod':139 'header':101 'howev':160 'includ':109 'individu':95 'infrastructur':137 'insight':116 'json-response' 'key':16,33,83 'label':169 'learn':119 'limit':85 'list':62,146,165 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':118 'metric':112 'micropayment API' 'multipl':106 'network':56 'no-api-key' 'page':191 'paid':94 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,100 'per':3,20,40,70 'platform':6,23,43,104 'point':153 'post-method' 'premium':64,172 'premium API access' 'price':128,152,188 'prompt':201 'protocol':48 'quot':133 'rate':84,131 'render':196 'report':113 'request':41,92 'requir':17,34,90 'respons':211 'return':185 'schema':207 'sentiment':120 'settl':155 'site':194 'specif':58,162 'summar':123 'text':122 'token':132 'unit':75 'unknown':219 'upfront':87 'usdc':9,26,51,77,157 'usdc-base' 'use':45 'util':138 'valid':140 'via':10,27,96 'wallet':200 'web3':127 'without':206 'x':99 'x-payment':98 'x402':11,28,47 'x402 API' 'x402-payment'","prices":[{"id":"f7c51586-fca8-44ed-9c0f-6238e02bcbbf","listingId":"158c59a3-5a1d-4ce8-b493-a6aaa59eee40","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:06.060Z"}],"sources":[{"listingId":"158c59a3-5a1d-4ce8-b493-a6aaa59eee40","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:06.060Z","lastSeenAt":"2026-04-24T11:32:06.869Z"}],"details":{"listingId":"158c59a3-5a1d-4ce8-b493-a6aaa59eee40","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/37 \\\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 with maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/37"},{"claim":"All listed APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a paid API endpoint without needing API key registration","Agent-driven workflows that settle per-call payments in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-use API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone who needs to understand the exact response schema before calling"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.503Z"},"updatedAt":"2026-04-24T11:32:06.869Z"}}