{"id":"8773993e-6a6d-46b6-a3f2-9a23781c0ea0","shortId":"TuLZuz","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","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 via the x402 protocol.\n\nThe specific endpoint `/api/v1/wire/23` is listed as \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made per-call with no API keys, no rate limits, and no upfront commitments required. The x402 challenge specifies the \"exact\" payment scheme with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render 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 platform's actual functionality behind each endpoint path is not described beyond short labels. Agents or developers considering this service should be aware that without documentation or schemas, the expected request format and response structure for `/api/v1/wire/23` (or any other endpoint) is unknown.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api","crypto api access"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats for any endpoint","The specific endpoint /api/v1/wire/23 is labeled 'Premium API Access' but its actual functionality is undocumented","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/23","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/wire/23","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 pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no description of what the /api/v1/wire/23 endpoint actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':19,38 '0.02':18,37,99,138 '000':133 '20':132 '300':175 '402 payment api' '6':143 'access':122 'across':58 'actual':218 'agent':230 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,121,155,184 'awar':238 'base':8,27,107,134,146 'base network api' 'behind':220 'beyond':227 'broad':50 'call':4,23,152 'catalog':51 'categori':60 'challeng':128,167 'classif':75 'classification' 'commit':163 'connect':193 'consid':233 'content':199 'convers':92 'crypto api access' 'data':11,30,61,65 'data-analytics' 'decim':144 'describ':226 'detail':210 'develop':232 'doc':183 'document':178,211,241 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,214,222,256 'estim':86 'exact':170 'exampl':207 'exchang':81 'expect':245 'export':66 'extrem':180 'feed':80 'financ':13,32,77 'finance-data' 'format':247 'four':59 'function':219 'gas':85 'generat':93 'geocod':90 'geocoding' 'infrastructur':88 'insight':67 'key':156 'label':229 'learn':70 'limit':159 'list':118 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':149 'metric':63 'micropayment api' 'network':108 'no-api-key' 'offer':48 'openapi':203 'page':188 'paid':102 'path':223 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':147,171 'per':3,22,55,100,151 'per-cal':150 'per-request-billing' 'platform':6,25,46,216 'premium':120 'price':79,97,185 'prompt':195 'protocol':112 'quot':84 'rate':82,158 'readm':187 'render':190 'report':64 'request':56,101,129,246 'request/response':206 'requir':164 'respons':249 'return':124 'schema':204,243 'scheme':172 'second':176 'sentiment':71 'sentiment-analysis' 'servic':235 'short':228 'sinc':140 'spars':181 'specif':114 'specifi':168 'structur':250 'substant':198 'summar':74 'text':73 'text-summarization' 'timeout':177 'token':83 'unit':135 'unknown':258 'upfront':162 'usd':139 'usdc':104,137,141 'usdc api' 'usdc-base' 'use':142 'util':15,34,89 'utility-apis' 'valid':91,126 'via':9,28,109 'wallet':194 'web3':78 'without':240 'x402':10,29,43,111,127,166 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"af17f2b2-cb38-4132-9128-7bca43f3aabf","listingId":"8773993e-6a6d-46b6-a3f2-9a23781c0ea0","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/wire/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:58.607Z"}],"sources":[{"listingId":"8773993e-6a6d-46b6-a3f2-9a23781c0ea0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:58.607Z","lastSeenAt":"2026-04-22T07:01:44.432Z"}],"details":{"listingId":"8773993e-6a6d-46b6-a3f2-9a23781c0ea0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/23 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/wire/23"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for AI inference (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on demand","Running utility operations like geocoding or data validation with no account setup","Integrating pay-as-you-go analytics and data export into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-use API access","Use cases requiring small, infrequent API calls where subscriptions are wasteful","Crypto-native workflows that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-call pricing adds up quickly","Users who need detailed API documentation, schemas, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.627Z"},"updatedAt":"2026-04-22T07:01:44.432Z"}}