{"id":"82e90fc8-d92e-4bfd-acea-bcfe4fa7ef92","shortId":"RFPv7G","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 offers a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/330` is labeled \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is settled on-chain to a specified wallet address with no API keys, subscriptions, or rate limits required.\n\nThe provider's landing page lists 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/charges/330`) does not clearly map to any of these named services — it sits under a `/charges/` path, and its description is simply \"Premium API Access\" with no further documentation about what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all rendered only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no examples available. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-on-base","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api-gateway","pay-per-call"],"synonyms":["x402 API","micropayment API","pay-per-call endpoint","USDC API access","Base network API","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only a wallet connect prompt","The endpoint path /api/v1/charges/330 does not match any of the named API endpoints listed on the homepage","No request or response schema is provided; it is unknown what payload to send or what data is returned","No OpenAPI specification found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/330","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/330","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the /charges/330 path does not correspond to any documented service. The docs pages are all empty wallet-connect prompts. This is effectively a stub 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'/api/v1/charges/330':57,165 '/charges':180 '/docs':206 '/pricing':208 '/readme':210 '/request':16,32 '0.02':15,31,86,155 '000':77 '20':76 '402':240 '6':82 'Base network API' 'USDC API access' 'accept':64 'access':62,189 'address':99 'advertis':72 'ai':9,25,126 'analysi':130 'analyt':8,24,120 'api':4,20,42,61,102,188 'avail':234 'base':7,23,51,68,78 'call':41 'captur':242 'categori':116 'chain':94 'challeng':71,241 'classif':133 'clear':168 'collect':36 'confirm':238 'connect':216 'content':222 'convers':149 'data':119,123,196 'decim':83 'descript':184 'document':193,201,245 'embed':134 'endpoint':13,29,43,55,118,161,236 'equal':85 'estim':144 'exampl':233 'exchang':139 'expect':257 'export':124 'extrem':203 'feed':138 'financ':10,26,135 'four':115 'function':198 'gas':143 'gate':3,19,44 'generat':150 'geocod':147 'howev':158 'infrastructur':146 'insight':125 'json-response' 'key':103 'label':59 'land':112 'learn':128 'limit':107 'list':114,163 'live':239 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':127 'map':169 'maxamountrequir':74 'metric':121 'micropayment API' 'name':174 'network':52 'no-api-key' 'no-rate-limit' 'offer':34 'on-chain':92 'openapi':226 'page':113,211 'path':181 'pay':39 'pay-per-cal':38 'pay-per-call endpoint' 'pay-per-request' 'payload':250 'payment':66,89 'per':40,87,156 'premium':60,187 'price':137,153 'prompt':218 'protocol':48 'provid':110 'quot':142 'rate':106,140 'render':213 'report':122 'request':88,157 'request/response':229 'requir':108 'respons':255 'return':200 'schema':230 'send':252 'sentiment':129 'servic':175 'settl':91 'simpli':186 'sit':177 'spars':204 'spec':227 'specif':54,160 'specifi':97 'subscript':104 'substant':221 'suit':5,21 'summar':132 'text':131 'token':141 'unclear':248 'unit':79 'usdc':65,81 'usdc-on-base' 'util':12,28 'valid':148 'wallet':98,217 'web3':136 'without':244 'x402':2,18,47,70 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"338756c9-d8fb-456a-9a8e-06e948383173","listingId":"82e90fc8-d92e-4bfd-acea-bcfe4fa7ef92","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/330","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:06.674Z"}],"sources":[{"listingId":"82e90fc8-d92e-4bfd-acea-bcfe4fa7ef92","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/330","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:06.674Z","lastSeenAt":"2026-04-24T00:31:57.029Z"}],"details":{"listingId":"82e90fc8-d92e-4bfd-acea-bcfe4fa7ef92","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Without an x402 client library, you'll get a 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/330\n# Returns 402 with x402 payment challenge (USDC on Base, $0.02)","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/330"},{"claim":"All listed 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 provider lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API services without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled via USDC on Base","Exploring x402 protocol integration for pay-per-request architectures"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Users who want zero-commitment, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-call crypto settlement adds latency","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.561Z"},"updatedAt":"2026-04-24T00:31:57.029Z"}}