{"id":"31e0e1f1-bd58-4db6-9201-1f457db5bcbf","shortId":"xn6Q2E","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-call API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/183` is listed as \"Premium API Access\" and requires up to 20,000 base units of USDC (i.e., $0.02) per request. Payment is made via an X-PAYMENT header; no API keys or account registration are needed.\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 are priced at $0.02 per request with no rate limits or minimums advertised.\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 description of what the `/api/v1/stripe/charges/183` endpoint actually returns. The endpoint is live (returns a valid x402 402 challenge), but without documentation it is unclear what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or input/output schema provided; request format and response structure are unknown","The specific endpoint path '/api/v1/stripe/charges/183' does not match any of the advertised API categories on the landing page, making its purpose unclear","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/183","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/stripe/charges/183","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 challenge, but there is zero documentation: no OpenAPI schema, no request/response examples, and no explanation of what the endpoint does beyond the label 'Premium API Access'. All doc pages render only 'Connect wallet'. The listing is essentially a 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'/api/v1/stripe/charges/183':65,194 '/docs':163 '/pricing':165 '/readme':167 '/request':16,34 '0.02':15,33,83,148 '000':77 '20':76 '402':206 '402 payment required' 'access':71 'account':99 'actual':196 'advertis':106,157 'ai':9,27,118 'ai-inference' 'analysi':122 'analyt':8,26,112 'analytics' 'api':4,22,46,70,96 'base':7,25,59,78 'base network api' 'broader':104 'call':45 'categori':108 'challeng':207 'classif':125 'classification' 'collect':40 'connect':173 'content':179 'convers':142 'data':111,115 'descript':190 'document':158,210 'embed':126 'embeddings' 'endpoint':13,31,47,63,110,195,199 'estim':136 'exampl':187 'exchang':131 'expect':222 'export':116 'extrem':160 'feed':130 'financ':10,28,127 'finance-data' 'four':107 'gas':135 'gate':3,21,48 'generat':143 'geocod':140 'geocoding' 'header':94 'host':38 'i.e':82 'infrastructur':138 'insight':117 'key':97 'learn':120 'limit':154 'list':67 'live':201 'low payment fee' 'lowpaymentfee.com':37 'machin':119 'made':88 'metric':113 'micropayment api' 'minimum':156 'need':102 'network':60 'no-api-key' 'openapi':183 'page':168 'pay':43 'pay per call api' 'pay-per-cal':42 'pay-per-call' 'payload':215 'payment':54,86,93 'per':44,84,149 'platform':105 'premium':69 'price':129,146 'prompt':175 'protocol':52 'quot':134 'rate':132,153 'registr':100 'render':170 'report':114 'request':85,150 'request/response':186 'requir':73 'respons':220 'return':197,202 'schema':184 'send':217 'sentiment':121 'sentiment-analysis' 'settl':53 'spars':161 'specif':62 'suit':5,23 'summar':124 'text':123 'text-summarization' 'token':133 'unclear':213 'unit':79 'usdc':18,36,56,81 'usdc api' 'usdc-base' 'util':12,30,139 'utility' 'valid':141,204 'via':17,35,89 'wallet':174 'web3':128 'without':209 'x':92 'x-payment':91 'x402':2,20,51,205 'x402 api' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"588e8ae7-9c5b-4376-81df-aca61571d78d","listingId":"31e0e1f1-bd58-4db6-9201-1f457db5bcbf","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/stripe/charges/183","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:08.322Z"}],"sources":[{"listingId":"31e0e1f1-bd58-4db6-9201-1f457db5bcbf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/183","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:08.322Z","lastSeenAt":"2026-04-22T20:01:24.797Z"}],"details":{"listingId":"31e0e1f1-bd58-4db6-9201-1f457db5bcbf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/183 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/183"},{"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 advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/183"}],"useCases":["Paying per-call for analytics metrics or reports without signing up for an account","Running AI inference (sentiment, summarization, classification, embeddings) via a simple HTTP POST with crypto payment","Fetching financial price feeds, exchange rates, or gas estimates on demand","Geocoding or data validation as a utility microservice"],"bestFor":["Developers who want zero-signup, pay-as-you-go 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 guaranteed SLAs before integrating","Anyone without USDC on the Base network or an x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.338Z"},"updatedAt":"2026-04-22T20:01:24.797Z"}}