{"id":"8eb77eed-6d11-45c6-afe4-ca8d4cfcae8a","shortId":"bFPfqq","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad suite of 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, settled in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/generate/resource/120` is listed under \"Premium API Access.\" The x402 challenge confirms it is live, accepting POST requests and requiring payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nDocumentation beyond the landing page is extremely sparse; the /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The exact functionality of the `/api/v1/generate/resource/120` endpoint (what it generates, what input it expects, what it returns) is not documented anywhere in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["infrastructure","general-purpose"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet' with no content","No OpenAPI or schema definition; request body and response format are completely unknown","The specific function of /api/v1/generate/resource/120 is undocumented — 'Premium API Access' is the only descriptor","No examples or sample responses available anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/120","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/generate/resource/120","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 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI spec, no request/response examples, and no explanation of what the endpoint actually does beyond the generic label 'Premium API Access.' The docs, pricing, and README pages are all empty. This is effectively a stub 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'/api/v1/generate/resource/120':109,227 '/docs':191 '/pricing':192 '/readme':195 '/request':19,38 '0.02':18,37,95,144 '000':133 '0x8335':138 '20':132 '2913':139 '6':148 'Base network API' 'USDC micropayment API' 'accept':123 'access':115 'across':54 'ai':12,31,64 'analysi':68 'analyt':58 'anywher':242 'api':5,24,45,114,160 'attach':171 'avail':221 'base':8,27,103,134,141 'base-network' 'beyond':183 'broad':50 'call':4,23 'caller':169 'categori':56 'challeng':118 'classif':71 'commit':168 'confirm':119 'connect':201 'content':207 'convers':88 'crawl':245 'crypto-paid API' 'data':11,30,57,61 'decim':149 'document':182,216,241 'embed':72 'enabl':44 'endpoint':16,35,53,91,107,228 'equal':143 'estim':82 'exact':156,223 'exampl':220 'exchang':77 'expect':235 'export':62 'extrem':188 'feed':76 'financ':13,32,73 'four':55 'function':224 'gas':81 'generat':89,231 'geocod':86 'given':145 'header':176 'infrastructur':84 'input':233 'insight':63 'json-response' 'key':161 'land':185 'learn':66 'limit':164 'list':111 'live':122 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':152 'materi':246 'metric':59 'network':104 'no-api-key' 'offer':10,29 'openapi':211 'page':186,196 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':128,150,175,180 'per':3,22,96 'platform':6,25,46 'post':124 'post-endpoint' 'premium':113 'premium API access' 'price':75,93 'prompt':203 'proof':181 'provid':48 'quot':80 'rate':78,163 'report':60 'request':97,125 'request/response':214 'requir':127 'return':198,238 'schema':215 'scheme':157 'sentiment':67 'settl':98 'simpli':170 'spars':189 'spec':212 'specif':106 'suit':51 'summar':70 'text':69 'token':79 'unit':135 'upfront':167 'usag':219 'usdc':9,28,100,137,146 'usdc-settlement' 'util':15,34,85 'valid':87,179 'via':153 'wallet':202 'web3':74 'x':174 'x-payment':173 'x402':43,117,155 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"42612e88-9881-4780-9803-6cb26b2cdb54","listingId":"8eb77eed-6d11-45c6-afe4-ca8d4cfcae8a","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/generate/resource/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:19.491Z"}],"sources":[{"listingId":"8eb77eed-6d11-45c6-afe4-ca8d4cfcae8a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/120","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:19.491Z","lastSeenAt":"2026-04-28T13:33:07.771Z"}],"details":{"listingId":"8eb77eed-6d11-45c6-afe4-ca8d4cfcae8a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/120 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge confirms the endpoint is live, accepting POST, with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/120"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to utility/generation endpoints without API key management","Agent-driven workflows that need on-demand API calls settled in USDC","Exploring x402 payment protocol integration with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-use API access on Base","Low-cost micropayment API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-throughput production workloads where endpoint behavior is undocumented","Anyone without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.197Z"},"updatedAt":"2026-04-28T13:33:07.771Z"}}