{"id":"93b69c47-d8fc-41e6-a381-1159e2642a4e","shortId":"L6NTUm","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. The specific resource at `/api/v1/charges/241` accepts POST requests and charges 20,000 base units of USDC (USD Coin, 6 decimals) on the Base network, which equals $0.02 per request. Payment is handled inline via the X-PAYMENT header with no API keys or accounts required.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning 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 priced at $0.02 per request. However, the specific endpoint `/api/v1/charges/241` is labeled only as \"Premium API Access\" with no further documentation on what data or functionality it returns. The crawled docs, pricing, and README pages all rendered as empty wallet-connect prompts, so no detailed schema, request/response examples, or feature descriptions are available.\n\nThe endpoint is confirmed live: it returns a well-formed x402 challenge (HTTP 402) with version 1, scheme \"exact\", and a 300-second payment timeout. Settlement goes to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the canonical Base USDC contract (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","premium-api-access"],"categories":["api","payment"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — docs, pricing, and README pages all render only a wallet-connect prompt with no content.","The specific functionality of /api/v1/charges/241 is undocumented; 'Premium API Access' is the only description provided.","No request body schema or response schema is available; callers cannot know what to send or what to expect back.","No OpenAPI spec, ai-plugin manifest, or agents.txt discovered."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/241","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/241","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation on what the endpoint actually returns, no request/response schema, and the docs/pricing/README pages are all behind a wallet-connect wall rendering no useful content. The specific function of '/api/v1/charges/241' is unknown beyond the label 'Premium API 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'/request':13,28 '0.02':12,27,70,140 '000':55 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':222 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':229 '1':209 '20':54 '300':214 '402':206 '402 payment endpoint' '6':62 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,22,38,154 'account':88 'address':221 'advertis':94 'ai':111 'analysi':115 'analyt':105 'api':6,21,37,85,102,153 'avail':191 'base':9,24,56,66,226 'broader':91 'call':4,19,101 'canon':225 'challeng':204 'charg':53 'classif':118 'coin':61 'confirm':195 'connect':179 'contract':228 'convers':135 'crawl':167 'crypto-paid API' 'data':104,108,161 'decim':63 'descript':189 'detail':183 'doc':168 'document':158 'embed':119 'empti':176 'endpoint':32,146,193 'equal':69 'estim':129 'exact':211 'exampl':186 'exchang':124 'export':109 'featur':188 'feed':123 'financ':120 'form':202 'function':163 'gas':128 'generat':136 'geocod':133 'goe':219 'handl':75 'header':82 'howev':143 'http':205 'infrastructur':131 'inlin':76 'insight':110 'key':86 'label':149 'learn':113 'live':196 'lowpaymentfee' 'lowpaymentfee.com':34,92 'machin':112 'metric':106 'network':67 'no-api-key' 'page':172 'pay':2,17,99 'pay-per-cal':1,16,98 'pay-per-call' 'pay-per-request API' 'payment':42,73,81,216 'per':3,18,71,100,141 'platform':93 'post':50 'premium':5,20,36,152 'premium-api-access' 'price':122,138,169 'prompt':180 'protocol':43 'provid':35 'quot':127 'rate':125 'readm':171 'render':174 'report':107 'request':51,72,142 'request/response':185 'requir':89 'resourc':46 'return':165,198 'schema':184 'scheme':210 'second':215 'sentiment':114 'settlement':218 'span':103 'specif':45,145 'suit':96 'summar':117 'text':116 'timeout':217 'token':126 'unit':57 'usd':60 'usdc':15,30,59,227 'usdc-base' 'use':223 'util':132 'valid':134 'version':208 'via':10,25,39,77 'wallet':178 'wallet-connect':177 'web3':121 'well':201 'well-form':200 'x':80 'x-payment':79 'x402':11,26,41,203 'x402 API' 'x402-payment'","prices":[{"id":"1581e8bf-7426-4fc2-bcb8-941491e74265","listingId":"93b69c47-d8fc-41e6-a381-1159e2642a4e","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/241","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:46.052Z"}],"sources":[{"listingId":"93b69c47-d8fc-41e6-a381-1159e2642a4e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/241","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:46.052Z","lastSeenAt":"2026-04-22T13:30:58.743Z"}],"details":{"listingId":"93b69c47-d8fc-41e6-a381-1159e2642a4e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/241 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/241"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/241"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource without needing API keys or subscriptions","Agent-driven workflows that pay per call using USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment-gated APIs","AI agents that need keyless, pay-as-you-go API access","Low-cost per-request API consumption settled on Base L2"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Use cases requiring free or high-volume bulk access without per-call fees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.473Z"},"updatedAt":"2026-04-22T13:30:58.743Z"}}