{"id":"301dad0f-8476-4a62-9601-7481478ee66d","shortId":"3xfjYt","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 a pay-per-request API platform that uses the x402 protocol to gate access to a collection of endpoints spanning data analytics, AI/ML inference, finance/crypto data, and general utility services. All endpoints are settled on the Base network using USDC, with a uniform price of $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint at `/api/v1/charges/193` is listed as \"Premium API Access\" and accepts POST requests. The broader platform advertises categories including 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). Each of these is priced identically at $0.02.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation makes it difficult to know what inputs each endpoint expects or what response formats are returned.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-data","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","analytics API","AI inference API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definitions found for any endpoint","The endpoint path '/api/v1/charges/193' with description 'Premium API Access' is ambiguous — it is unclear what this specific endpoint returns or what input it expects","The site lists many endpoint categories but without documentation it is impossible to verify they are functional","No request or response examples available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/193","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/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works. However, documentation is essentially nonexistent — all doc/pricing/readme pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, and no usage examples. The specific endpoint '/api/v1/charges/193' has a generic 'Premium API Access' description with no indication of what it actually does. Score reflects a live but poorly documented 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'/api/v1/charges/193':121 '/docs':184 '/pricing':185 '/readme':188 '/request':16,32 '0.02':15,31,81,178 '000':85 '20':84 '6':91 'AI inference API' 'Base network API' 'USDC API' 'accept':129 'access':49,127 'advertis':135 'ai':9,25,145 'ai-inference' 'ai/ml':58 'analysi':149 'analyt':8,24,57,139 'analytics API' 'api':4,20,40,94,126 'attach':105 'avail':215 'base':7,23,72,86 'base-network' 'broader':133 'caller':103 'categori':136 'challeng':222 'classif':152 'collect':52 'commit':100 'confirm':229 'connect':194 'content':219 'convers':169 'crawl':218 'crypto-data' 'data':56,61,138,142 'data-analytics' 'decim':92 'detail':201 'difficult':241 'document':179,210,238 'embed':153 'embeddings' 'endpoint':13,29,54,67,119,231,247 'estim':163 'exampl':214 'exchang':158 'expect':248 'export':143 'extrem':181 'feed':157 'financ':10,26,154 'finance-data' 'finance/crypto':60 'form':228 'format':252 'gas':162 'gate':3,19,48 'general':63 'generat':170 'geocod':167 'geocoding' 'header':110 'ident':176 'includ':137 'infer':59 'infrastructur':165 'input':245 'insight':144 'key':95 'know':243 'lack':236 'learn':147 'limit':97 'list':123 'live':224 'low payment fee' 'lowpaymentfee.com':33 'machin':146 'make':239 'metric':140 'micropayment API' 'network':73 'openapi':205 'oper':233 'page':189 'pay':37 'pay per call API' 'pay-per-request':36 'payment':109,115 'per':38,82 'platform':41,134 'post':130 'premium':125 'price':79,156,175 'prompt':196 'proof':116 'protocol':46 'quot':161 'rate':96,159 'render':191 'report':141 'request':39,83,131 'request/response':208 'requir':102 'respons':251 'return':254 'schema':209 'sentiment':148 'sentiment-analysis' 'servic':65 'settl':69 'simpli':104 'span':55 'spars':182 'spec':206 'specif':118 'suit':5,21 'summar':151 'technic':200 'text':150 'text-classification' 'text-summarization' 'token':160 'uniform':78 'unit':87 'upfront':99 'usag':213 'usdc':75,89 'usdc-settlement' 'use':43,74 'util':12,28,64,166 'utility-apis' 'valid':113,168 'wallet':195 'web3':155 'well':227 'well-form':226 'x':108 'x-payment':107 'x402':2,18,45,114,221 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"ebed6ede-1013-4480-b24d-03cc62f020f0","listingId":"301dad0f-8476-4a62-9601-7481478ee66d","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/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:39.320Z"}],"sources":[{"listingId":"301dad0f-8476-4a62-9601-7481478ee66d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/193","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:39.320Z","lastSeenAt":"2026-04-23T10:00:48.177Z"}],"details":{"listingId":"301dad0f-8476-4a62-9601-7481478ee66d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/193 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoints span Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/193"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates via micropayment","Running geocoding or data validation as a utility service with no subscription commitment","Exporting data or generating analytics reports on a per-request billing model"],"bestFor":["AI agents that need keyless, pay-as-you-go access to diverse API endpoints","Developers prototyping with multiple API categories without signing up for separate services","x402-compatible wallets and agents on the Base network"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.769Z"},"updatedAt":"2026-04-23T10:00:48.177Z"}}