{"id":"fca9a564-ecc1-41f1-806f-6d73d4d3907f","shortId":"wXfSZS","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API platform that gates a collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/charges/192` is listed as \"Premium API Access\" and accepts payment via the x402 exact scheme. The 402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals.\n\nThe provider's landing page advertises four categories of APIs: 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 endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\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 detailed documentation available from the crawl. The specific functionality behind the `/api/v1/charges/192` path is unclear; it may be a generic charge endpoint or map to one of the listed services. Without documentation or example payloads, the actual behavior of this endpoint cannot be confirmed beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found","The specific purpose of /api/v1/charges/192 ('Premium API Access') is not explained anywhere","No request or response examples available","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/192","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/192","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet connect prompt. The specific functionality of /api/v1/charges/192 is 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'/api/v1/charges/192':63,212 '/docs':174 '/pricing':176 '/readme':178 '/request':17,34 '0.02':16,33,98,154 '000':87 '0x8335':92 '20':86 '2913':93 '402':79 '6':104 'Base network API' 'USDC API' 'accept':71 'access':69 'actual':237 'advertis':111 'ai':10,27,123 'amount':84 'analysi':127 'analyt':117 'api':4,21,41,68,115,159 'avail':203 'base':7,24,57,88,95 'base-network' 'behavior':238 'behind':49,210 'beyond':245 'cannot':242 'categori':113 'challeng':80,248 'charg':221 'classif':130 'collect':46 'commit':167 'confirm':244 'connect':184 'content':190 'convers':147 'crawl':206 'data':9,26,116,120 'decim':105 'detail':201 'document':169,202,232 'embed':131 'endpoint':14,31,48,61,150,222,241 'equal':97 'estim':141 'exact':76 'exampl':198,234 'exchang':136 'export':121 'extrem':171 'feed':135 'financ':11,28,132 'four':112 'function':209 'gas':140 'gate':3,20,44 'generat':148 'generic':220 'geocod':145 'given':101 'indic':81 'infrastructur':143 'insight':122 'json-response' 'key':160 'land':109 'learn':125 'limit':163 'list':65,152,229 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'map':224 'max':83 'may':217 'metadata':249 'metric':118 'micropay':54 'micropayment API' 'minimum':166 'network':58 'no-api-key' 'offer':8,25 'one':226 'openapi':194 'page':110,179 'path':213 'pay-per-request API' 'payload':235 'payment':72 'per':51,99,155 'per-request':50 'per-request-billing' 'platform':5,22,42 'premium':67 'price':134 'prompt':186 'protocol':40 'provid':107 'quot':139 'rate':137,162 'render':181 'report':119 'request':52,100,156 'request/response':197 'requir':168 'schema':195 'scheme':77 'sentiment':126 'servic':230 'spars':172 'specif':60,208 'summar':129 'text':128 'token':138 'unclear':215 'unit':89 'usdc':53,91,102 'usdc-micropayment' 'util':13,30,144 'valid':146 'via':73 'wallet':185 'web3':133 'without':231 'x402':2,19,39,75,247 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"dee71549-e978-4992-98d2-ce375402eea3","listingId":"fca9a564-ecc1-41f1-806f-6d73d4d3907f","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/192","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:32.702Z"}],"sources":[{"listingId":"fca9a564-ecc1-41f1-806f-6d73d4d3907f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/192","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:32.702Z","lastSeenAt":"2026-04-24T04:03:33.415Z"}],"details":{"listingId":"fca9a564-ecc1-41f1-806f-6d73d4d3907f","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Supply an X-PAYMENT header with a valid x402 payment proof.\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/192 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/192"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Programmatic agent-driven API consumption with on-chain USDC micropayments","Accessing data, AI inference, finance, or utility endpoints via x402 protocol"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-throughput use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.098Z"},"updatedAt":"2026-04-24T04:03:33.415Z"}}