{"id":"f284e860-6082-43b0-96e3-dd62676aeccf","shortId":"ttZFAJ","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com hosts a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/318` is labeled \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base) via the x402 exact-payment scheme. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys, subscriptions, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader platform advertises four categories of endpoints: 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint `/api/v1/charges/318` does not clearly map to any single named service — it may be a generic charge endpoint or a catch-all premium access route.\n\nDocumentation is extremely thin. The /docs, /api, /pricing, 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 usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know what data or functionality it actually returns upon successful payment.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-payment","base-network","pay-per-call","no-api-key","http-post"],"categories":["api-gateway","misc"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment required","crypto api gateway"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found; request and response formats are unknown.","The endpoint path /api/v1/charges/318 does not clearly correspond to any of the named services listed on the homepage.","Cannot verify what data or functionality is returned upon successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/318","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/318","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 pricing and payment details. However, there is no OpenAPI spec, no request/response schema, and all documentation pages are empty beyond a wallet-connect prompt. The actual functionality behind this specific endpoint path is unclear, making this effectively a stub 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'/api/v1/charges/318':57,174 '/docs':204 '/pricing':206 '/readme':208 '/request':16,32,168 '0.02':15,31,95,167 '000':86 '0x8335':69 '20':85 '2913':70 '402':246 '402 payment required' '6':91 'accept':64 'access':62,197 'actual':261 'advertis':106,123 'ai':9,25,135 'amount':82 'analysi':139 'analyt':8,24,129 'api':4,20,42,61,99 'attach':109 'avail':234 'base':7,23,51,72,87 'base usdc api' 'base-network' 'broader':121 'call':41 'caller':107 'catch':194 'catch-al':193 'categori':125 'challeng':247 'charg':189 'classif':142 'clear':177 'collect':36 'confirm':241 'connect':214 'content':220 'contract':68 'convers':159 'crawl':237 'crypto api gateway' 'data':128,132,257 'decim':92 'difficult':253 'document':199,229,250 'embed':143 'endpoint':13,29,43,55,127,163,173,190,239 'equal':94 'estim':153 'exact':77 'exact-pay':76 'exampl':233 'exchang':148 'export':133 'extrem':201 'feed':147 'financ':10,26,144 'four':124 'function':259 'gas':152 'gate':3,19,44 'generat':160 'generic':188 'geocod':157 'header':114 'host':34 'howev':170 'http-post' 'infrastructur':155 'insight':134 'key':100 'know':255 'label':59 'learn':137 'limit':104 'list':162 'live':242 'low payment fee' 'lowpaymentfee.com':33 'machin':136 'map':178 'maximum':81 'may':185 'metric':130 'micropayment api' 'name':182 'network':52 'no-api-key' 'openapi':224 'page':209 'pay':39 'pay per call api' 'pay-per-cal':38 'pay-per-call' 'payment':65,78,113,118,265 'per':40,96 'per-request-billing' 'platform':122 'premium':60,196 'price':146,169 'prompt':216 'proof':119 'proper':245 'protocol':48 'quot':151 'rate':103,149 'render':211 'report':131 'request':97 'request/response':227 'requir':83 'return':243,262 'rout':198 'schema':228 'scheme':79 'sentiment':138 'servic':183 'share':164 'simpli':108 'singl':181 'spec':225 'specif':54,172 'subscript':101 'success':264 'suit':5,21 'summar':141 'text':140 'thin':202 'token':150 'unit':88 'upon':263 'usag':232 'usdc':67,90 'usdc-payment' 'util':12,28,156 'valid':117,158 'via':73 'wallet':215 'web3':145 'without':249 'x':112 'x-payment':111 'x402':2,18,47,75 'x402 api' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"3b4383c1-468e-4d81-b139-3e8e2526563e","listingId":"f284e860-6082-43b0-96e3-dd62676aeccf","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/318","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:00.464Z"}],"sources":[{"listingId":"f284e860-6082-43b0-96e3-dd62676aeccf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/318","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:00.464Z","lastSeenAt":"2026-04-22T09:01:01.553Z"}],"details":{"listingId":"f284e860-6082-43b0-96e3-dd62676aeccf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/318 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/318"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/318"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for API access without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Exploring x402 protocol integration for pay-as-you-go microservices"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-request API access on Base","Low-volume consumers who prefer no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume production workloads requiring well-documented, stable schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.824Z"},"updatedAt":"2026-04-22T09:01:01.553Z"}}