{"id":"52be5433-eafe-47d6-9e4f-d7b5bee6e2c9","shortId":"rjU7kX","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/173` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled entirely through the x402 header mechanism — no API keys, accounts, or rate limits are required.\n\nThe broader lowpaymentfee.com platform advertises a suite of 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 $0.02 per request. However, this specific listing is for the `/api/v1/charges/173` resource, whose exact functionality beyond \"Premium API Access\" is not documented in the crawled material.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. The payment timeout is 300 seconds, and the payee address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. Documentation pages on the site (docs, pricing, README) all resolve but contain only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schema for this specific charge endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The exact functionality of /api/v1/charges/173 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (/docs, /pricing, /README, /api) return only a 'Connect wallet' prompt with no technical content.","No request body schema or response schema is available — callers cannot know what to send or what to expect back.","The relationship between this specific charge endpoint and the broader suite of advertised APIs (analytics, AI, finance, utils) is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/173","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/173","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 challenge, but the actual functionality behind 'Premium API Access' at /api/v1/charges/173 is completely undocumented. No request/response schema, no examples, and all documentation pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'/request':13,28 '0.02':12,27,70,145 '000':57 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':200 '0x8335':62 '1':185 '20':56 '2913':63 '300':193 '402':182 '6':75 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,22,38,163 'account':89 'across':104 'actual':225 'address':198 'advertis':99 'ai':114 'analysi':118 'analyt':108 'api':6,21,37,87,162 'base':9,24,58,66 'beyond':160 'broader':96 'call':4,19 'categori':106 'challeng':180 'charg':53,231 'classif':121 'connect':215 'contain':212 'convers':138 'crawl':169 'crypto-paid endpoint' 'data':107,111 'decim':76 'detail':222 'doc':206 'document':166,201 'embed':122 'endpoint':32,103,141,172,232 'entir':80 'equal':69 'estim':132 'exact':158 'exchang':127 'export':112 'feed':126 'financ':123 'four':105 'function':159 'gas':131 'generat':139 'geocod':136 'handl':79 'header':84 'howev':148 'http':181 'infrastructur':134 'insight':113 'key':88 'learn':116 'limit':92 'list':143,151 'live':174 'lowpaymentfee' 'lowpaymentfee.com':34,97 'machin':115 'materi':170 'mechan':85 'metric':109 'network':67 'no-api-key' 'page':202 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'paye':197 'payment':42,77,190 'per':3,18,71,146 'platform':98 'post':50 'post-endpoint' 'premium':5,20,36,161 'premium API access' 'price':125,207 'prompt':217 'protocol':43,188 'provid':35 'quot':130 'rate':91,128 'readm':208 'report':110 'request':51,72,147 'request/response':226 'requir':94 'resolv':210 'resourc':46,156 'return':176 'schema':227 'second':194 'sentiment':117 'site':205 'specif':45,150,230 'suit':101 'summar':120 'technic':221 'text':119 'timeout':191 'token':129 'unit':59 'unknown':234 'usdc':15,30,61,73 'usdc-base' 'use':74 'util':135 'valid':137,178 'version':184 'via':10,25,39 'wallet':216 'web3':124 'whose':157 'x402':11,26,41,83,179 'x402 API' 'x402-payment'","prices":[{"id":"9b791ca0-a0da-45b6-ac2f-bcb7319cf086","listingId":"52be5433-eafe-47d6-9e4f-d7b5bee6e2c9","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/173","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:21.199Z"}],"sources":[{"listingId":"52be5433-eafe-47d6-9e4f-d7b5bee6e2c9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/173","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:21.199Z","lastSeenAt":"2026-04-24T05:32:02.985Z"}],"details":{"listingId":"52be5433-eafe-47d6-9e4f-d7b5bee6e2c9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/173 \\\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":"Endpoint returns HTTP 402 with x402 version 1 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/173"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/173"},{"claim":"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":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource without needing an API key or subscription","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 API documentation or guaranteed SLAs","Use cases requiring known, well-documented request/response schemas","High-volume workloads where $0.02/request adds up significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.685Z"},"updatedAt":"2026-04-24T05:32:02.985Z"}}