{"id":"ed260c8f-a27d-43be-9510-5d2285344be4","shortId":"pjUVuK","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 collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/keys/18` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals). The platform advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nThe platform's landing page confirms a simple pay-per-use model with no minimums or commitments. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge was successfully captured, confirming the endpoint is live. However, documentation is extremely sparse — there is no OpenAPI spec, no request/response schema, and no examples available. The exact functionality behind the \"Premium API Access\" label at `/api/v1/keys/18` is unclear and may differ from the other listed endpoints.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","USDC API","micropayment API","low fee API","Base network API","serverless API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The endpoint /api/v1/keys/18 ('Premium API Access') is not listed among the site's advertised API catalog — its exact functionality is unknown","No request or response examples are available; integration requires trial-and-error","Pricing and /README pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/18","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/18","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/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation, and no examples. The specific purpose of the `/api/v1/keys/18` endpoint labeled \"Premium API Access\" is ambiguous — it does not appear in the site's listed endpoint catalog, making it unclear what it actually 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'/request':19,38 '0.02':18,37,107,151 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':180 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':183 '20':112 '6':119 'Base network API' 'USDC API' 'access':102,221 'address':179 'advertis':123 'ai':12,31 'ai-inference' 'ai/ml':57 'analysi':128 'analyt':56 'api':5,24,45,83,101,220 'avail':213 'base':8,27,76,114,185 'behind':217 'broad':50 'call':4,23,109 'captur':191 'chain':177 'challeng':188 'classif':131 'classification' 'collect':51 'commit':171 'confirm':159,192 'convers':143 'cost':104 'crypto-paid API' 'crypto-quotes' 'data':11,30,55,60,145 'data-analytics' 'decim':120 'differ':229 'document':198 'embed':132 'embeddings' 'enabl':44 'endpoint':16,35,53,66,94,125,194,234 'estim':140 'exact':215 'exampl':212 'exchang':135 'extrem':200 'feed':134 'financ':13,32 'finance-data' 'finance/web3':59 'function':216 'gas':139 'general':62 'generat':146 'geocod':141 'geocoding' 'howev':197 'infer':58 'key':84 'label':222 'land':157 'limit':87 'list':98,233 'live':196 'low fee API' 'lowpaymentfee.com':39 'maxamountrequir':110 'may':228 'micropayment API' 'minimum':169 'model':166 'network':77 'offer':10,29 'on-chain':175 'openapi':205 'page':158 'paid':68 'pay':2,21,163 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-us':162 'payment':172 'per':3,22,70,108,164 'per-request':69 'per-request-billing' 'platform':6,25,46,122,155 'point':153 'premium':100,219 'price':133,152 'protocol':81 'provid':48 'quot':138 'rate':86,136 'request':71 'request/response':208 'requir':91 'schema':209 'sentiment':127 'sentiment-analysis' 'serverless API access' 'servic':64 'settl':174 'sibl':124 'simpl':161 'span':54 'spars':201 'spec':206 'specif':93 'subscript':90 'success':190 'summar':130 'text':129 'text-summarization' 'token':137 'unclear':226 'unit':115 'usdc':9,28,73,117,182 'usdc-base' 'use':72,165,181 'util':15,34,63 'utility-services' 'valid':142 'via':78 'x402':43,80,187 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"0d287d9b-209e-4677-8036-bc75d2d89c60","listingId":"ed260c8f-a27d-43be-9510-5d2285344be4","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.105Z"}],"sources":[{"listingId":"ed260c8f-a27d-43be-9510-5d2285344be4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.105Z","lastSeenAt":"2026-04-22T09:02:14.461Z"}],"details":{"listingId":"ed260c8f-a27d-43be-9510-5d2285344be4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/18 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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, all 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 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/keys/18"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility service paid in USDC on Base","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse API endpoints","Developers who prefer crypto micropayments over subscription billing","Applications on Base that want native USDC settlement for API calls"],"notFor":["High-volume use cases where per-call pricing at $0.02 adds up quickly compared to bulk plans","Users who need detailed API documentation, schemas, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.277Z"},"updatedAt":"2026-04-22T09:02:14.461Z"}}