{"id":"a1f543d4-06f7-4fbf-ad37-4cc55b7ab4d1","shortId":"5kbdak","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering 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 settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/153` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint 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 uniformly priced at $0.02 per request.\n\nNote that the specific `/api/v1/messages/153` endpoint does not clearly map to any of the advertised categories — its purpose is ambiguous from the available documentation. The site's docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["The /api/v1/messages/153 endpoint does not correspond to any of the documented API categories on the site — its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema is available for any endpoint.","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no technical content.","The platform appears to be a generic demonstration or placeholder — the uniform $0.02 pricing across very different endpoint types (AI, finance, geo, etc.) with no further docs is unusual."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/153","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/messages/153","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The specific endpoint path (/api/v1/messages/153) does not match any advertised category, making its purpose 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'/request':19,38 '0.02':18,37,80,167 '000':84 '20':83 '402 payment API' '6':90 'Base network API' 'USDC API' 'access':75 'account':102 'actual':217 'advertis':124,184 'ai':12,31,135 'ai-inference' 'ambigu':189 'analysi':139 'analyt':129 'api':5,24,45,74,100 'attach':110 'avail':192 'base':8,27,63,85 'base-network' 'broad':50 'call':4,23,82 'caller':108 'catalog':51 'categori':127,185 'classif':142 'clear':178 'connect':207 'convers':159 'cost':77 'cover':10,29 'data':11,30,128,132 'data-analytics' 'decim':91 'detail':214 'doc':197 'document':193 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,162,175,222 'estim':153 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'finance-data' 'four':125 'gas':152 'generat':160 'geocod':157 'handl':94 'header':115 'infrastructur':155 'insight':134 'key':101 'learn':137 'limit':105 'list':71 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':136 'map':179 'metric':130 'micropayment API' 'minim':206 'network':64 'no-api-key' 'note':170 'offer':48 'page':201 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,114,119 'per':3,22,55,81,168 'platform':6,25,46,123 'premium':73 'price':146,165,198 'prompt':209 'proof':120 'protocol':98 'purpos':187 'quot':151 'rate':104,149 'readm':200 'report':131 'request':56,169 'request/response':218 'requir':107 'resolv':203 'schema':219 'sentiment':138 'settl':58 'simpli':109 'site':195 'specif':66,173 'summar':141 'technic':213 'text':140 'token':150 'uniform':164 'unit':86 'unknown':224 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,156 'utility-services' 'valid':118,158 'via':95 'wallet':208 'web3':145 'wider':122 'x':113 'x-payment':112 'x402':43,97 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"464077d0-a2a6-4371-8663-e80b1b13f807","listingId":"a1f543d4-06f7-4fbf-ad37-4cc55b7ab4d1","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/messages/153","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.040Z"}],"sources":[{"listingId":"a1f543d4-06f7-4fbf-ad37-4cc55b7ab4d1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/153","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.040Z","lastSeenAt":"2026-04-22T05:32:15.824Z"}],"details":{"listingId":"a1f543d4-06f7-4fbf-ad37-4cc55b7ab4d1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/153 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/153"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/153"},{"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":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to AI inference (sentiment, summarization, classification, embeddings) with per-call billing","Fetching real-time financial data (prices, exchange rates, gas estimates) with crypto micropayments","Utility operations like geocoding, validation, and data conversion paid per request"],"bestFor":["AI agents and bots that can settle payments in USDC on Base","Developers who want zero-commitment, pay-as-you-go API access","Use cases requiring low-cost ($0.02) individual API calls without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.657Z"},"updatedAt":"2026-04-22T05:32:15.824Z"}}