{"id":"3fcfd006-ab54-4a28-8572-d122bc0071bb","shortId":"7gNkfM","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 `/api/v1/keys/89` 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, no subscriptions, no rate limits. You send a POST request with an `X-PAYMENT` header containing a signed payment proof, and the endpoint returns its result as `application/json`.\n\nThe broader 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 priced at $0.02 per request. The payment recipient address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the USDC asset contract is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` (Base mainnet USDC).\n\nNote that while the landing page lists many endpoints, only `/api/v1/keys/89` was probed and confirmed live. No OpenAPI schema, detailed documentation, or example responses were found for any endpoint. The `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no additional content. The actual behavior and output format of this specific endpoint remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-platform","data","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The actual functionality and response format of /api/v1/keys/89 ('Premium API Access') is unknown","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","Only this single endpoint was probed; the other advertised endpoints have not been verified live"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/89","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/keys/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live (402 challenge captured) with clear pricing ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no example requests or responses, and the actual functionality of /api/v1/keys/89 is completely undocumented. The broader site lists many endpoints but provides no detail beyond names and 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'/api/v1/keys/89':68,204 '/pricing':225 '/readme':227 '/request':19,38 '0.02':18,37,79,175 '000':83 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':183 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':190 '20':82 '402 payment api' '6':89 'access':74 'actual':241 'addit':238 'address':181 'advertis':133 'ai':12,31,144 'analysi':148 'analyt':138 'api':5,24,45,73,99 'application/json':129 'asset':187 'base':8,27,63,84,191 'base network api' 'behavior':242 'broad':50 'broader':131 'call':4,23,81 'catalog':51 'categori':136 'classif':151 'confirm':208 'connect':233 'contain':117 'content':239 'contract':188 'convers':168 'cost':76 'cover':10,29 'data':11,30,137,141 'decim':90 'detail':213 'document':214 'embed':152 'enabl':44 'endpoint':16,35,57,67,124,135,171,202,222,249 'estim':162 'exampl':216 'exchang':157 'export':142 'feed':156 'financ':13,32,153 'format':245 'found':219 'four':134 'gas':161 'generat':169 'geocod':166 'handl':93 'header':116 'infrastructur':164 'insight':143 'json-response' 'key':100 'land':198 'learn':146 'limit':105 'list':70,200 'live':209 'low payment fee' 'lowpaymentfee.com':39 'machin':145 'mainnet':192 'mani':201 'metric':139 'micropayment api' 'network':64 'no-api-key' 'note':194 'offer':48 'openapi':211 'output':244 'page':199,228 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':91,115,120,179 'per':3,22,55,80,176 'platform':6,25,46,132 'post':109 'post-method' 'premium':72 'price':155,173 'probe':206 'prompt':235 'proof':121 'protocol':97 'quot':160 'rate':104,158 'recipi':180 'remain':250 'report':140 'request':56,110,177 'respons':217 'result':127 'return':125,230 'schema':212 'send':107 'sentiment':147 'settl':58 'sign':119 'specif':66,248 'subscript':102 'summar':150 'text':149 'token':159 'undocu':251 'unit':85 'usdc':9,28,60,87,186,193 'usdc api' 'usdc-base-settlement' 'util':15,34,165 'valid':167 'via':94 'wallet':234 'web3':154 'x':114 'x-payment':113 'x402':43,96 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2bd19fb2-f1e2-425d-8d49-d9ac9a959aae","listingId":"3fcfd006-ab54-4a28-8572-d122bc0071bb","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/keys/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.150Z"}],"sources":[{"listingId":"3fcfd006-ab54-4a28-8572-d122bc0071bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.150Z","lastSeenAt":"2026-04-22T01:02:19.660Z"}],"details":{"listingId":"3fcfd006-ab54-4a28-8572-d122bc0071bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/89 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/89"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/89"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls from autonomous agents using x402 USDC payments","Integrating pay-as-you-go analytics, AI inference, or financial data into workflows"],"bestFor":["Agents or developers who want zero-commitment, per-call API access","x402-compatible wallets and clients on Base network","Use cases requiring low-cost micropayments ($0.02) per API call"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.646Z"},"updatedAt":"2026-04-22T01:02:19.660Z"}}