{"id":"a1408a8e-d7dc-4708-8d50-3a25d32edfc9","shortId":"c6ZfsM","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The specific resource at `/api/v1/charges/315` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is settled on-chain with no API keys, no rate limits, and no sign-up required.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated endpoints 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 endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific endpoint `/api/v1/charges/315` is labeled only as \"Premium API Access\" with no further documentation on 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, it is unclear what payload this particular endpoint produces.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"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":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet'","The specific resource /api/v1/charges/315 has no description beyond 'Premium API Access'; actual functionality is unknown","No OpenAPI schema, no example requests or responses provided","No robots.txt or agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/315","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/315","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 a valid 402 x402 challenge) 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 behind '/api/v1/charges/315' is entirely undocumented, making this effectively a stub 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'/call':13,28 '/request':151 '0.02':12,27,71,150 '000':60 '0x8335':65 '20':59 '2913':66 '6':76 'Base network API' 'USDC micropayment API' 'accept':52 'access':7,22,38,165 'addit':195 'advertis':101 'ai':117 'analysi':121 'analyt':111 'api':6,21,37,86,164,181 'base':9,24,45,61,68 'behind':39 'broader':98 'chain':83 'charg':56 'classif':124 'connect':190 'content':196 'convers':141 'crypto-paid endpoint' 'data':110,114,172 'decim':77 'detail':199 'doc':178 'document':169 'embed':125 'endpoint':32,108,144,157,210 'equal':70 'estim':135 'exampl':201 'exchang':130 'export':115 'feed':129 'financ':126 'function':174 'gas':134 'gate':107 'generat':142 'geocod':139 'howev':154 'infrastructur':137 'insight':116 'json-response' 'key':87 'label':160 'learn':119 'limit':90 'list':146 'lowpaymentfee' 'lowpaymentfee.com':34,99 'machin':118 'metric':112 'network':46 'no-api-key' 'on-chain':81 'page':182 'particular':209 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payload':207 'payment':78 'paywal':42 'per':3,18,72 'platform':100 'point':153 'post':53 'post-endpoint' 'premium':5,20,36,163 'premium API access' 'price':128,152,179 'produc':211 'prompt':192 'provid':35 'quot':133 'rate':89,131 'render':187 'report':113 'request':4,19,54,73 'requir':96 'resourc':49 'respons':202 'return':176 'schema':198 'sentiment':120 'settl':80 'sign':94 'sign-up':93 'site':185 'span':109 'specif':48,156 'suit':103 'summar':123 'text':122 'token':132 'unclear':205 'unit':62 'usdc':15,30,64,74 'usdc-base' 'use':75 'util':138 'valid':140 'via':10,25 'wallet':191 'web3':127 'without':197 'x402':11,26,41,106 'x402 API' 'x402-gated':105 'x402-payment'","prices":[{"id":"f58fe37a-00b0-4552-9a1e-b74585a21276","listingId":"a1408a8e-d7dc-4708-8d50-3a25d32edfc9","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/315","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:58.078Z"}],"sources":[{"listingId":"a1408a8e-d7dc-4708-8d50-3a25d32edfc9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/315","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:58.078Z","lastSeenAt":"2026-04-24T01:32:05.812Z"}],"details":{"listingId":"a1408a8e-d7dc-4708-8d50-3a25d32edfc9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/315 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/315"},{"claim":"All endpoints 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 lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/315"}],"useCases":["Accessing a pay-per-request API without needing API keys or subscriptions","Programmatic agent-driven API consumption with on-chain USDC settlement","Testing x402 payment protocol integrations on the Base network"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, on-demand API access settled in USDC on Base","Low-volume, pay-as-you-go API consumption without commitments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone without a Base-compatible wallet holding USDC"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.939Z"},"updatedAt":"2026-04-24T01:32:05.812Z"}}