{"id":"c3668e4a-4798-4e64-a398-1959fe8c33c4","shortId":"LGTkFS","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four 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 utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/products/50` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. Payment is made via the x402 protocol's exact scheme — no API keys, subscriptions, or rate limits are required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse; the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. It is unclear what the `/api/v1/products/50` endpoint actually returns or what input it expects beyond a POST request. The platform appears live and functional based on the 402 challenge, but the lack of documentation makes it difficult to evaluate the quality or specifics of the data returned.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["data","llm","finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No API documentation available — /docs, /pricing, /api, /README pages are all empty beyond a wallet connect prompt","No OpenAPI or schema definition found for any endpoint","Unknown request body format and response structure for /api/v1/products/50","The endpoint name 'Premium API Access' is generic and does not describe what data is returned","Cannot verify what the 16+ advertised endpoints actually do or whether they are all functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/50","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/products/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, documentation is essentially nonexistent — /docs, /pricing, /api, and /README all show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and no description of what /api/v1/products/50 actually returns. The listing is effectively a stub with confirmed 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'/api/v1/products/50':113,209 '/call':12,31 '/docs':173 '/pricing':174 '/readme':177 '0.02':11,30,99,134 '000':128 '20':127 '402':122,231 'Base network API' 'USDC API' 'accept':158 'access':118 'across':58 'actual':211 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,117,148 'appear':224 'application/json':163 'avail':203 'base':8,27,107,129,136,228 'beyond':165,218 'broad':50 'catalog':51 'categori':60 'challeng':123,232 'classif':75 'classification' 'connect':183 'content':189 'convers':92 'conversion' 'data':14,33,61,65,249 'data-analytics' 'difficult':240 'document':164,198,237 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,95,111,157,210 'estim':86 'evalu':242 'exact':145 'exampl':201 'exchang':81 'exchange-rates' 'expect':217 'export':66 'extrem':170 'feed':80 'financ':16,35,77 'finance-data' 'four':59 'function':227 'gas':85 'gas-estimates' 'generat':93 'geocod':90 'geocoding' 'i.e':133 'infrastructur':88 'input':215 'insight':67 'key':149 'label':115 'lack':235 'land':167 'learn':70 'limit':153 'live':225 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':139 'make':238 'metric':63 'micropayment API' 'network':108 'offer':48 'openapi':193 'page':168,178 'paid':102 'pay':2,21,54 'pay-per-call API' 'pay-per-request':1,20,53 'payload':202 'payment':137 'per':3,22,55,100 'platform':6,25,46,223 'post':159,220 'premium':116 'price':79,97 'prompt':185 'protocol':143 'qualiti':244 'quot':84 'rate':82,152 'render':180 'report':64 'request':4,23,56,101,124,160,221 'request/response':196 'requir':155 'return':120,162,212,250 'schema':197 'scheme':146 'sentiment':71 'sentiment-analysis' 'spars':171 'spec':194 'specif':110,246 'subscript':150 'substant':188 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':206 'unit':130 'usdc':104,132 'usdc-base' 'util':18,37,89 'valid':91 'validation' 'via':9,28,140 'wallet':184 'web3':78 'x402':10,29,43,142 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"4079b3d3-bf48-43e6-bc41-d7449c0861e0","listingId":"c3668e4a-4798-4e64-a398-1959fe8c33c4","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/products/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:26.757Z"}],"sources":[{"listingId":"c3668e4a-4798-4e64-a398-1959fe8c33c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:26.757Z","lastSeenAt":"2026-04-24T06:31:35.055Z"}],"details":{"listingId":"c3668e4a-4798-4e64-a398-1959fe8c33c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/50 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/products/50"},{"claim":"/docs, /pricing, /api, and /README pages render only 'Connect wallet' with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing analytics metrics and reports without API key management","Running AI inference (sentiment, summarization, classification, embeddings) on a per-request basis","Fetching real-time crypto gas estimates and token quotes","Geocoding and data validation via simple paid HTTP calls","Prototyping integrations that need instant, keyless API access"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost, low-friction access to diverse utility endpoints"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime","Users who need detailed API documentation and request/response schemas before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.671Z"},"updatedAt":"2026-04-24T06:31:35.055Z"}}