{"id":"36b7f99c-f331-4fd7-87dc-e1786d242b59","shortId":"uJAbMw","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 is an x402-protocol API provider offering a broad catalog of pay-per-call endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/charges/331` is labeled \"Premium API Access\" and accepts POST requests with an x402 payment header. The 402 challenge indicates a maximum charge of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are advertised; access is gated purely by the x402 payment mechanism.\n\nThe provider's landing page lists four endpoint categories: 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/Utility (geocoding, validation, conversion, generation). All listed endpoints are priced at $0.02 per request. However, the specific endpoint probed (`/api/v1/charges/331`) does not directly correspond to any of these named endpoints, so its exact functionality beyond \"Premium API Access\" is unclear.\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 spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (402 challenge returned), but without documentation it is difficult to know what data or service it actually provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The probed endpoint path /api/v1/charges/331 does not match any of the named endpoints on the landing page; its actual functionality is unknown","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/331","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/331","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific endpoint's purpose beyond 'Premium API Access' is unknown. This is effectively a stub 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'/api/v1/charges/331':62,173 '/docs':199 '/pricing':201 '/readme':203 '/request':16,32 '0.02':15,31,94,165 '000':86 '0x8335':91 '20':85 '402':78,238 '6':99 'Base network API' 'USDC micropayment API' 'accept':69 'access':67,109,191 'actual':254 'advertis':108 'ai':9,25,134 'analysi':138 'analyt':8,24,128 'api':4,20,39,66,102,190 'avail':229 'base':7,23,56,87 'base-network' 'beyond':188 'broad':43 'call':49 'catalog':44 'categori':126 'challeng':79,239 'charg':83 'classif':141 'confirm':236 'connect':209 'content':215 'convers':157 'correspond':177 'crawl':232 'crypto-paid API' 'data':127,131,250 'decim':100 'difficult':246 'direct':176 'document':194,224,243 'embed':142 'endpoint':13,29,50,60,125,161,171,183,234 'equal':93 'estim':152 'exact':186 'exampl':228 'exchang':147 'export':132 'extrem':196 'feed':146 'financ':10,26,143 'four':124 'function':187 'gas':151 'gate':3,19,111 'generat':158 'geocod':155 'header':76 'howev':168 'indic':80 'infrastructure/utility':154 'insight':133 'json-response' 'key':103 'know':248 'label':64 'land':121 'learn':136 'limit':106 'list':123,160 'live':237 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':135 'maximum':82 'mechan':117 'metric':129 'name':182 'network':57 'no-api-key' 'offer':41 'openapi':219 'page':122,204 'pay':47 'pay-per-cal':46 'pay-per-call API' 'pay-per-request' 'payment':75,116 'per':48,95,166 'post':70 'post-endpoint' 'premium':65,189 'premium API access' 'price':145,163 'probe':172 'prompt':211 'protocol':38 'provid':40,119,255 'pure':112 'quot':150 'rate':105,148 'render':206 'report':130 'request':71,96,167 'request/response':222 'return':240 'schema':223 'sentiment':137 'servic':252 'settl':51 'spars':197 'spec':220 'specif':59,170 'suit':5,21 'summar':140 'text':139 'token':149 'unclear':193 'unit':88 'usag':227 'usdc':53,90,97 'usdc-settlement' 'use':98 'util':12,28 'valid':156 'wallet':210 'web3':144 'without':242 'x402':2,18,37,74,115 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':36","prices":[{"id":"0636a831-d879-42b5-8ed9-c81980241163","listingId":"36b7f99c-f331-4fd7-87dc-e1786d242b59","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/331","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:13.936Z"}],"sources":[{"listingId":"36b7f99c-f331-4fd7-87dc-e1786d242b59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/331","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:13.936Z","lastSeenAt":"2026-04-24T00:31:57.369Z"}],"details":{"listingId":"36b7f99c-f331-4fd7-87dc-e1786d242b59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/331 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/331"},{"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 USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/331"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to analytics, AI inference, finance data, or utility services without API key management","Agent-driven workflows that need pay-per-call endpoints settled on-chain","Accessing data or services with minimal friction via x402 micropayments"],"bestFor":["Developers or agents wanting zero-signup, pay-per-use API access","On-chain payment workflows on Base using USDC","Low-cost per-request API consumption at $0.02/call"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to subscription models","Anyone without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.155Z"},"updatedAt":"2026-04-24T00:31:57.369Z"}}