{"id":"2aa95a1a-7b14-46cc-8dfb-00eaf526fd1c","shortId":"YUNHcr","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, 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 priced at $0.02 per request, settled in USDC on Base.\n\nThe specific endpoint `/api/v1/charges/373` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requiring a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. There are no API keys, no rate limits, and no minimum commitments — payment is handled entirely via the x402 protocol's X-PAYMENT header.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what this particular charge endpoint returns. The site's landing page lists many endpoints but does not explain what data or functionality `/api/v1/charges/373` specifically provides. Prospective users should be aware that the actual behavior of this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","premium-api-access"],"categories":["api-gateway","crypto"],"synonyms":["low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","crypto-gated endpoint","402 payment required"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The specific behavior and response format of /api/v1/charges/373 is unknown; 'Premium API Access' is the only description provided.","No OpenAPI schema or request/response examples are available.","The site lists many endpoints but none have documented input/output schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/373","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/373","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific functionality of /api/v1/charges/373 is entirely undocumented, making this effectively a stub 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'0.02':10,28,99,143 '000':132 '0x8335':137 '20':131 '2913':138 '402 payment required' '6':141 'Base network API' 'USDC pay-per-call' 'accept':117 'access':6,24,44,115 'actual':237 'ai':68 'analysi':72 'analyt':67 'api':5,16,23,34,43,64,114,149,177 'awar':234 'base':8,26,51,106,133,140 'behavior':238 'behind':45 'broad':57 'call':63,145 'catalog':58 'challeng':122 'charg':208 'classif':75 'commit':157 'confirm':123 'connect':186 'content':192 'convers':92 'crypto-gated endpoint' 'data':66,224 'decim':142 'descript':203 'doc':176 'document':171 'embed':76 'endpoint':38,95,109,209,218,241 'entir':161 'estim':86 'exampl':200 'exchang':81 'explain':222 'extrem':173 'feed':80 'financ':77 'function':226 'gas':85 'gate':3,21 'generat':93 'geocod':90 'handl':160 'header':170 'host':55 'infrastructur':88 'key':17,35,150 'label':112 'land':214 'learn':70 'limit':153 'list':216 'live':126 'low payment fee API' 'lowpaymentfee.com':40 'machin':69 'mani':217 'maximum':129 'micropayment API' 'minimum':156 'network':52 'no-api-key' 'openapi':196 'page':181,215 'particular':207 'pay':9,27,61 'pay-per-cal':60 'pay-per-request' 'payment':158,169 'paywal':48 'per':11,29,62,100,144 'post':118 'post-endpoint' 'premium':4,22,42,113 'premium-api-access' 'price':79,97,178 'prompt':188 'prospect':230 'protocol':165 'provid':41,229 'quot':84 'rate':82,152 'readm':180 'render':183 'request':12,30,101,119 'request/response':199 'requir':18,36,127 'return':210 'schema':197 'sentiment':71 'settl':102 'site':54,212 'span':65 'spars':174 'specif':108,228 'summar':74 'text':73 'token':83 'undocu':243 'unit':134 'usdc':14,32,104,136 'usdc-base' 'user':231 'util':89 'valid':91 'via':162 'wallet':187 'web3':78 'x':168 'x-payment':167 'x402':2,20,47,121,164 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"955bd699-5603-4b10-aa5e-41206aca1853","listingId":"2aa95a1a-7b14-46cc-8dfb-00eaf526fd1c","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/373","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:28.393Z"}],"sources":[{"listingId":"2aa95a1a-7b14-46cc-8dfb-00eaf526fd1c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/373","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:28.393Z","lastSeenAt":"2026-04-23T23:02:31.600Z"}],"details":{"listingId":"2aa95a1a-7b14-46cc-8dfb-00eaf526fd1c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/373 \\\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 requiring 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/373"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for API access without managing API keys or subscriptions","Integrating x402-compatible agents that settle payments in USDC on Base","Accessing a catalog of data, AI, finance, and utility endpoints at low per-request cost"],"bestFor":["Developers or agents wanting key-free, pay-per-use API access","x402-compatible wallets and autonomous agents on Base","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.544Z"},"updatedAt":"2026-04-23T23:02:31.600Z"}}