{"id":"5799aa10-eacf-44f9-a716-717dc9ef40ac","shortId":"eCTFnn","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The site advertises 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 with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/164` is labeled \"Premium API Access\" in the x402 challenge. The challenge confirms it accepts an exact-scheme payment of up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). Payment is made via the X-PAYMENT header per the x402 protocol, and the endpoint accepts POST requests returning application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint returns. The site's landing page lists many endpoints but provides no detail on request parameters or response formats for any of them. Without documentation it is unclear what specific functionality `/api/v1/charges/164` provides beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/charges/164 is undocumented; 'Premium API Access' is a generic label","Cannot verify what data or service this endpoint actually returns without paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/164","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/164","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 spec, no documentation beyond a landing page listing, no request/response schemas, and no examples. The specific purpose of /api/v1/charges/164 is unclear beyond the generic 'Premium API Access' label. This is effectively a stub 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'/api/v1/charges/164':113,243 '/docs':178 '/pricing':179 '/readme':182 '0.02':10,24,91,147 '000':137 '0x8335':142 '20':136 '6':150 'Base network API' 'USDC API access' 'accept':127,168 'access':6,20,36,118,250 'advertis':47 'ai':60 'analysi':64 'analyt':59 'api':5,19,35,56,101,117,249 'application/json':172 'base':8,22,43,98,138,144 'base-network' 'behind':37 'beyond':245 'broad':49 'call':55 'catalog':50 'challeng':122,124 'classif':67 'commit':108 'confirm':125 'connect':188 'content':194 'convers':84 'data':58 'decim':151 'detail':224 'document':173,203,236 'embed':68 'endpoint':30,87,112,167,211,220 'equal':146 'estim':78 'exact':130 'exact-schem':129 'exampl':206 'exchang':73 'extrem':175 'feed':72 'financ':69 'format':230 'function':242 'gas':77 'gate':3,17 'generat':85 'generic':247 'geocod':82 'header':160 'infrastructur':80 'json-response' 'key':102 'label':115,251 'land':216 'learn':62 'limit':105 'list':218 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'made':154 'mani':219 'micropayment API' 'network':44 'no-api-key' 'openapi':198 'page':183,217 'paramet':227 'particular':210 'pay':9,23,53 'pay-per-cal':52 'pay-per-call API' 'pay-per-request' 'payment':132,152,159 'paywal':40 'per':11,25,54,92,161 'post':169 'post-method' 'premium':4,18,34,116,248 'price':71,89 'prompt':190 'protocol':164 'provid':33,222,244 'quot':76 'rate':74,104 'render':185 'request':12,26,93,170,226 'request/response':201 'requir':109 'respons':229 'return':171,212 'schema':202 'scheme':131 'sentiment':63 'settl':94 'site':46,214 'span':57 'spars':176 'spec':199 'specif':111,241 'summar':66 'text':65 'token':75 'unclear':239 'unit':139 'usdc':14,28,96,141,148 'usdc-settlement' 'use':149 'util':81 'valid':83 'via':155 'wallet':189 'web3':70 'without':235 'x':158 'x-payment':157 'x402':2,16,39,121,163 'x402 premium API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"2b810051-1e4b-48d9-bf3e-16c932d7ea5e","listingId":"5799aa10-eacf-44f9-a716-717dc9ef40ac","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/164","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:19.988Z"}],"sources":[{"listingId":"5799aa10-eacf-44f9-a716-717dc9ef40ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/164","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:19.988Z","lastSeenAt":"2026-04-24T05:02:31.162Z"}],"details":{"listingId":"5799aa10-eacf-44f9-a716-717dc9ef40ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/164 \\\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/164"},{"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 lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/164"}],"useCases":["Programmatic access to premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API key management","Integrating pay-as-you-go API calls into Web3 workflows on Base"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-friction API access without rate limits or subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who prefer flat-rate or subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.711Z"},"updatedAt":"2026-04-24T05:02:31.162Z"}}