{"id":"7526cc7b-47e8-44c8-b5f0-afec0eb7a81f","shortId":"WVUAgY","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/194` accepts POST requests and requires payment of up to 20,000 base units of USDC (0x8335…2913) on the Base network, which translates to $0.02 per request (USDC uses 6 decimals). Payment is settled on-chain to the specified wallet address with a 300-second timeout window.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs 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 with no API keys, no rate limits, and no minimum commitments.\n\nHowever, the specific endpoint `/api/v1/charges/194` 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 technical documentation or schema details. Without more information, it is unclear what payload this particular endpoint expects or returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","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 API"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet' with no technical content","The specific functionality of /api/v1/charges/194 is unknown; 'Premium API Access' is not descriptive","No input or output schema provided; callers cannot know what payload to send or what to expect back","The broader site lists many API categories but it is unclear if they are all functional or placeholders"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/194","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/194","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, confirming it accepts USDC payments on Base at $0.02/request. However, there is no documentation on what this specific endpoint does, no input/output schema, no example requests or responses, and the site's docs pages are empty beyond a wallet-connect prompt. The listing title 'Premium API Access' is generic and 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'/request':13,28 '0.02':12,27,73,147 '000':59 '0x8335':64 '20':58 '2913':65 '300':93 '6':78 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,22,38,172 'across':106 'addit':202 'address':90 'advertis':101 'ai':116 'analysi':120 'analyt':110 'api':6,21,37,105,152,171,188 'base':9,24,60,68 'base-network' 'broader':98 'call':4,19 'categori':108 'chain':85 'classif':123 'commit':160 'connect':197 'convers':140 'crypto-paid API' 'data':109,113,179 'decim':79 'detail':207 'doc':185 'document':176,204 'embed':124 'endpoint':32,143,164,218 'estim':134 'exchang':129 'expect':219 'export':114 'feed':128 'financ':125 'four':107 'function':181 'gas':133 'generat':141 'geocod':138 'howev':161 'inform':210 'infrastructur':136 'insight':115 'key':153 'label':167 'learn':118 'limit':156 'list':145 'lowpaymentfee' 'lowpaymentfee.com':34,99 'machin':117 'metric':111 'minimum':159 'network':69 'no-api-key' 'on-chain':83 'page':189 'particular':217 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payload':215 'payment':42,54,80 'per':3,18,74,148 'platform':100 'post':50 'post-endpoint' 'premium':5,20,36,170 'premium API access' 'price':127,186 'prompt':199 'protocol':43 'provid':35 'quot':132 'rate':130,155 'render':194 'report':112 'request':51,75,149 'requir':53 'resourc':46 'return':183,221 'schema':206 'second':94 'sentiment':119 'settl':82 'site':192 'specif':45,163 'specifi':88 'suit':103 'summar':122 'technic':203 'text':121 'timeout':95 'token':131 'translat':71 'unclear':213 'unit':61 'usdc':15,30,63,76 'usdc-settlement' 'use':77 'util':137 'valid':139 'via':10,25,39 'wallet':89,198 'web3':126 'window':96 'without':208 'x402':11,26,41 'x402 API' 'x402-payment'","prices":[{"id":"be4fb30f-fa3c-4417-991d-177437ae0154","listingId":"7526cc7b-47e8-44c8-b5f0-afec0eb7a81f","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/194","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:35.716Z"}],"sources":[{"listingId":"7526cc7b-47e8-44c8-b5f0-afec0eb7a81f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/194","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:35.716Z","lastSeenAt":"2026-04-24T04:03:33.524Z"}],"details":{"listingId":"7526cc7b-47e8-44c8-b5f0-afec0eb7a81f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/194 \\\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 challenge requiring up to 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/194"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/194"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access with on-chain settlement","Low-volume, pay-per-use API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where per-request crypto payments add overhead","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.994Z"},"updatedAt":"2026-04-24T04:03:33.524Z"}}