{"id":"36149557-f4ff-426a-88bc-a8c3f620473a","shortId":"QqxNqk","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 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 with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/18` is labeled \"Premium API Access\" in the x402 challenge. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is via the x402 exact scheme: callers attach an X-PAYMENT header with a signed payment to the payTo address. The endpoint accepts POST requests and returns 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, and no examples available. It is unclear what specific data or functionality this particular endpoint (/api/v1/charges/18) returns, as the site's landing page lists many different API categories but does not map charge IDs to specific services. Agents should treat this as a generic paid endpoint until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["general","api-gateway"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema provided; request and response formats are unknown","The specific functionality of /api/v1/charges/18 ('Premium API Access') is not described anywhere","Cannot determine what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/18","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/18","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 request/response schema, no documentation beyond a wallet-connect prompt, and no clarity on what this specific charge ID returns. Effectively a stub 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'/api/v1/charges/18':113,219 '/docs':179 '/pricing':180 '/readme':183 '0.02':10,24,91,143 '000':130 '0x8335':135 '20':129 '2913':136 '6':139 'Base network API' 'USDC API access' 'accept':168 'access':6,20,36,118 'address':165 'advertis':125 'agent':241 'ai':60 'analysi':64 'analyt':59 'api':5,19,35,56,101,117,230 'application/json':173 'attach':152 'avail':207 'base':8,22,43,98,131,138 'base-network' 'behind':37 'broad':49 'call':55 'caller':151 'catalog':50 'categori':231 'challeng':122,124 'charg':236 'classif':67 'commit':108 'connect':189 'content':195 'convers':84 'data':58,213 'decim':140 'differ':229 'document':174,252 'embed':68 'endpoint':30,87,112,167,218,249 'equal':142 'estim':78 'exact':149 'exampl':206 'exchang':73 'extrem':176 'feed':72 'financ':69 'function':215 'gas':77 'gate':3,17 'generat':85 'generic':247 'geocod':82 'header':157 'host':47 'id':237 'infrastructur':80 'json-response' 'key':102 'label':115 'land':225 'learn':62 'limit':105 'list':227 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'mani':228 'map':235 'maxamountrequir':127 'micropayment API' 'network':44 'no-api-key' 'openapi':199 'page':184,226 'paid':248 'particular':217 'pay':9,23,53 'pay-per-cal':52 'pay-per-call API' 'pay-per-request' 'payment':144,156,161 'payto':164 'paywal':40 'per':11,25,54,92 'post':169 'post-method' 'premium':4,18,34,116 'price':71,89 'prompt':191 'provid':33 'quot':76 'rate':74,104 'render':186 'request':12,26,93,170 'request/response':202 'requir':109 'return':172,220 'schema':203 'scheme':150 'sentiment':63 'servic':240 'settl':94 'sign':160 'site':46,223 'span':57 'spars':177 'spec':200 'specif':111,212,239 'summar':66 'surfac':253 'text':65 'token':75 'treat':243 'unclear':210 'unit':132 'usdc':14,28,96,134 'usdc-settlement' 'util':81 'valid':83 'via':146 'wallet':190 'web3':70 'x':155 'x-payment':154 'x402':2,16,39,121,148 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"869873ab-7e47-4500-a31b-81f32557dda5","listingId":"36149557-f4ff-426a-88bc-a8c3f620473a","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:18.242Z"}],"sources":[{"listingId":"36149557-f4ff-426a-88bc-a8c3f620473a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:18.242Z","lastSeenAt":"2026-04-22T10:31:31.077Z"}],"details":{"listingId":"36149557-f4ff-426a-88bc-a8c3f620473a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/18 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/18"},{"claim":"All listed APIs 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 & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for API access without needing an API key or subscription","Programmatic agent-driven access to paid endpoints using x402 protocol","Accessing data, AI, finance, or utility APIs with USDC micropayments on Base"],"bestFor":["Agents or developers wanting keyless, pay-per-use API access","x402-compatible wallets and clients on Base","Low-volume or sporadic API consumers who prefer no commitments"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume consumers who need bulk pricing or rate guarantees","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.855Z"},"updatedAt":"2026-04-22T10:31:31.077Z"}}