{"id":"a2e0e6f6-d8f8-4802-a9e8-72915c80f555","shortId":"mMnk7B","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 marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/products/57` is listed as \"Premium API Access\" and returns an x402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 endpoints are listed at the same $0.02 per request price point.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all appear to show only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The exact functionality of the `/api/v1/products/57` endpoint specifically is unclear; it may be a product catalog entry or a meta-endpoint. Callers should expect JSON responses based on the mimeType declared in the x402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","micropayment API","pay-per-call API","Base USDC API","402 payment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all render only a wallet-connect prompt with no content.","No OpenAPI or JSON schema provided for any endpoint.","The exact functionality of /api/v1/products/57 ('Premium API Access') is not described anywhere; it may be a generic product entry.","No request or response examples are available from the provider."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/57","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/57","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 challenge, confirming pricing and network details. However, there is no OpenAPI schema, no request/response examples, and all documentation pages beyond the landing page are empty stubs. The specific purpose of /api/v1/products/57 is unclear. This is effectively a stub 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'/api/v1/products/57':67,217 '/docs':178 '/pricing':180 '/readme':182 '/request':17,34 '0.02':16,33,91,164 '000':85 '20':84 '402 payment API' 'Base USDC API' 'access':45,73 'advertis':119 'ai':10,27,131 'ai-inference' 'analysi':135 'analyt':125 'api':4,21,41,72,95 'appear':185 'attach':104 'base':7,24,61,86,239 'behind':51 'beyond':170 'broader':117 'call':93 'caller':102,234 'catalog':227 'categori':121 'challeng':78,247 'classif':138 'classification' 'connect':190 'content':196 'convers':155 'data':9,26,124,128 'data-analytics' 'declar':243 'detail':207 'document':169,208 'embed':139 'embeddings' 'endpoint':14,31,50,65,123,158,211,218,233 'entri':228 'estim':149 'exact':213 'exampl':204 'exchang':144 'expect':236 'export':129 'extrem':175 'feed':143 'financ':11,28,140 'finance-data' 'four':120 'function':214 'gas':148 'gate':3,20,44 'generat':156 'geocod':153 'geocoding' 'header':109 'i.e':90 'infrastructur':151 'insight':130 'json':237 'key':96 'land':172 'learn':133 'limit':99 'list':69,160 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':132 'marketplac':42 'may':223 'meta':232 'meta-endpoint':231 'metric':126 'micropay':55 'micropayment API' 'mimetyp':242 'network':62 'offer':8,25 'openapi':200 'page':173,183 'pay-per-call API' 'payment':80,108,114 'per':53,92,165 'per-request':52 'per-request-micropayment' 'platform':5,22,118 'point':168 'premium':71 'price':142,167 'product':226 'prompt':192 'proof':115 'protocol':40 'quot':147 'rate':98,145 'report':127 'request':54,166 'request/response':203 'requir':79,101 'respons':238 'return':75 'schema':201 'sentiment':134 'sentiment-analysis' 'settl':56 'show':187 'simpli':103 'spars':176 'specif':64,219 'substant':195 'summar':137 'text':136 'text-summarization' 'token':146 'unclear':221 'unit':87 'usdc':58,89 'usdc-base' 'util':13,30,152 'utility-apis' 'valid':112,154 'varieti':48 'wallet':191 'web3':141 'x':107 'x-payment':106 'x402':2,19,39,77,113,246 'x402 API marketplace' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"000842eb-27b7-4eee-a0c4-483dfa6e17c3","listingId":"a2e0e6f6-d8f8-4802-a9e8-72915c80f555","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:26.138Z"}],"sources":[{"listingId":"a2e0e6f6-d8f8-4802-a9e8-72915c80f555","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:26.138Z","lastSeenAt":"2026-04-23T20:01:21.905Z"}],"details":{"listingId":"a2e0e6f6-d8f8-4802-a9e8-72915c80f555","quickStartSnippet":"# 1. Send a POST to discover the x402 payment challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/products/57\n# Returns 402 with x402 challenge JSON.\n# 2. Construct an X-PAYMENT header with a valid payment proof\n#    for 20000 base-units USDC on Base, then:\ncurl -X POST https://lowpaymentfee.com/api/v1/products/57 \\\n  -H \"X-PAYMENT: <payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge requiring up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/products/57"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only a 'Connect wallet' prompt with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates","Running data analytics queries and exporting reports on a pay-per-use basis","Geocoding and data validation as utility microservices"],"bestFor":["Agents or developers who want keyless, pay-per-request API access","Use cases requiring low-cost micropayments ($0.02/call) settled on Base","Prototyping or low-volume workloads where subscription plans are overkill"],"notFor":["High-volume production workloads where per-request crypto payments add overhead","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:23:32.957Z"},"updatedAt":"2026-04-23T20:01:21.905Z"}}