{"id":"02024d88-87ef-4d2b-8404-d3846ad71b65","shortId":"qeRMQD","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering messaging, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering messaging, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/messages/3` is listed as \"Premium API Access\" and accepts POST requests. It charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed payment proof, and the server verifies it before returning the response as application/json.\n\nThe broader platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling. The exact functionality of the `/api/v1/messages/3` endpoint is unclear beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","messaging-api","json-response","no-api-key","post-method"],"categories":["messaging","infrastructure"],"synonyms":["premium API","low fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","messages endpoint"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality of /api/v1/messages/3 is undocumented — 'Premium API Access' is not descriptive","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content","No example request or response payloads could be determined"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/3","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the purpose of '/api/v1/messages/3' is vague ('Premium API Access'). Effectively a stub 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'/request':18,36 '0.02':17,35,119,183 '000':108 '0x8335':113 '20':107 '2913':114 '6':124 'Base network API' 'USDC pay-per-call' 'accept':100 'access':98,214 'addit':160 'advertis':159 'ai':12,30,55 'analysi':164 'analyt':54 'api':5,23,43,78,97,213 'application/json':155 'base':8,26,74,109,116 'beyond':209 'broad':48 'broader':157 'call':4,22,121 'caller':133 'charg':104 'classif':167 'collect':49 'commit':86 'convers':175 'cover':10,28 'crawl':199 'data':53,177 'decim':125 'detail':190 'document':191 'embed':168 'enabl':42 'endpoint':51,64,90,161,206 'equal':118 'exact':201 'exampl':193 'exchang':171 'export':178 'feed':170 'financ':13,31,58 'found':197 'function':202 'generic':211 'geocod':173 'handl':128 'header':139 'howev':186 'includ':134 'infrastructur':61 'json-response' 'key':79 'label':215 'learn':57 'limit':82 'list':94 'low fee API' 'lowpaymentfee.com':37 'machin':56 'messag':11,29 'messages endpoint' 'messaging-api' 'micropayment API' 'minimum':85 'network':75 'no-api-key' 'offer':46 'openapi':188 'pay':2,20,67 'pay-per-cal':1,19 'pay-per-request':66 'payload':195 'payment':126,138,143 'per':3,21,68,120 'platform':44,158 'point':185 'post':101 'post-method' 'premium':96,212 'premium API' 'price':169,184 'proof':144 'protocol':132 'rate':81,172 'request':69,102 'request/response':194 'requir':87 'respons':153 'return':151 'schema':189 'sentiment':163 'server':147 'sign':142 'span':52 'specif':89 'suit':6,24 'summar':166 'text':165 'unclear':208 'unit':110 'usdc':9,27,71,112,122 'usdc-base' 'use':70,123 'util':15,33,62 'valid':174 'verifi':148 'via':129 'web3':59 'x':137 'x-payment':136 'x402':41,131 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"68068b73-52b7-49aa-b9d8-2406f329f702","listingId":"02024d88-87ef-4d2b-8404-d3846ad71b65","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.680Z"}],"sources":[{"listingId":"02024d88-87ef-4d2b-8404-d3846ad71b65","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.680Z","lastSeenAt":"2026-04-22T09:02:19.028Z"}],"details":{"listingId":"02024d88-87ef-4d2b-8404-d3846ad71b65","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/3 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/3"},{"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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Sending or retrieving messages via a pay-per-call interface without needing API keys","Integrating low-cost API calls into agent workflows that settle payments on Base","Accessing a suite of utility, AI, and finance endpoints with uniform $0.02 pricing"],"bestFor":["Developers wanting frictionless, keyless API access with crypto micropayments","AI agents that can autonomously pay for API calls via x402","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring free or subscription-based API access without per-call payments","Use cases needing guaranteed SLAs or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.668Z"},"updatedAt":"2026-04-22T09:02:19.028Z"}}