{"id":"4391f3dc-c5fe-42fc-9925-82cb5728a1bc","shortId":"nhVnMY","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 USDC micropayments on the Base network. The platform organizes its offerings into 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). Each endpoint costs $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/payments/176` is listed as \"Premium API Access\" and returns a valid x402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The challenge specifies a maxAmountRequired of 20,000 base units, which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme by including an X-PAYMENT header. The endpoint accepts POST requests and returns application/json responses.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, 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 examples of what this particular endpoint actually returns. The endpoint is live and the x402 challenge is well-formed, but without documentation it is unclear what data or functionality \"Premium API Access\" specifically provides.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","low payment fee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/payments/176 ('Premium API Access') is undocumented; it is unclear what data or service it provides.","No request body schema or response schema is available.","No OpenAPI or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/176","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/payments/176","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 and costs $0.02 USDC on Base. However, there is no OpenAPI spec, no request/response schema, and no documentation beyond a landing page listing. The purpose of this specific 'Premium API Access' endpoint is entirely unclear, making this effectively a stub 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'/api/v1/payments/176':124 '/docs':197 '/pricing':199 '/readme':201 '/request':17,34 '0.02':16,33,105,158 '000':153 '0x8335':142 '20':152 '2913':143 '6':162 'Base network API' 'USDC API access' 'accept':181 'access':45,130,258 'actual':232 'ai':10,27,76 'analysi':80 'analyt':70 'api':4,21,41,110,129,257 'application/json':186 'base':7,24,59,145,154 'base-network' 'behind':51 'beyond':189 'categori':68 'challeng':136,147,241 'classif':83 'commit':118 'connect':207 'contract':141 'convers':100 'cost':104 'data':9,26,69,73,253 'decim':163 'detail':214 'document':188,223,248 'embed':84 'endpoint':14,31,50,103,122,180,231,235 'equal':157 'estim':94 'exact':170 'exampl':226 'exchang':89 'export':74 'extrem':194 'feed':88 'financ':11,28,85 'form':245 'four':67 'function':255 'gas':93 'gate':3,20,44 'generat':101 'geocod':98 'given':159 'header':178 'includ':173 'infrastructur':96 'insight':75 'json-response' 'key':111 'land':191 'learn':78 'limit':114 'list':126 'live':237 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':77 'made':166 'marketplac':42 'maxamountrequir':150 'metric':71 'micropay':56 'micropayment API' 'minimum':117 'network':60 'no-api-key' 'offer':8,25,65 'openapi':218 'organ':63 'page':192,202 'particular':230 'pay-per-request API' 'payment':138,164,177 'per':53,106 'per-request':52 'per-request-billing' 'platform':5,22,62 'post':182 'post-method' 'premium':128,256 'price':87 'prompt':209 'protocol':40 'provid':260 'quot':92 'rate':90,113 'render':204 'report':72 'request':54,107,137,183 'request/response':221 'requir':119 'respons':187 'return':132,185,233 'schema':222 'scheme':171 'sentiment':79 'spars':195 'spec':219 'specif':121,259 'specifi':148 'summar':82 'technic':213 'text':81 'token':91 'unclear':251 'unit':155 'usdc':55,140,160 'usdc-micropayment' 'util':13,30,97 'valid':99,134 'varieti':48 'via':167 'wallet':208 'web3':86 'well':244 'well-form':243 'without':247 'x':176 'x-payment':175 'x402':2,19,39,135,169,240 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"2aca6c39-a3e6-436d-8d74-51f9af4312d8","listingId":"4391f3dc-c5fe-42fc-9925-82cb5728a1bc","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/payments/176","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:42.405Z"}],"sources":[{"listingId":"4391f3dc-c5fe-42fc-9925-82cb5728a1bc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/176","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:42.405Z","lastSeenAt":"2026-04-22T23:01:41.917Z"}],"details":{"listingId":"4391f3dc-c5fe-42fc-9925-82cb5728a1bc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/176 \\\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 platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, each at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $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 x402 challenge returns maxAmountRequired of 20000 base units in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/payments/176"},{"claim":"The endpoint accepts POST requests and returns application/json.","source_url":"https://lowpaymentfee.com/api/v1/payments/176"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or request/response schemas before purchasing","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without a Base-compatible wallet holding USDC"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.117Z"},"updatedAt":"2026-04-22T23:01:41.917Z"}}