{"id":"42cdc404-515a-43c7-aa4d-0fd45142ca9a","shortId":"LwS6nD","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/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required. Payments are handled via the x402 protocol: callers include an X-PAYMENT header with each request, and the server settles on-chain.\n\nThe specific endpoint at `/api/v1/messages/20` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals = $0.02). It accepts HTTP POST requests and returns `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a maximum timeout of 300 seconds.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 per request price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available from the crawled pages, so the exact input parameters and response formats for this specific endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","messaging-api","json-response","no-api-key","no-rate-limit"],"categories":["messaging","general"],"synonyms":["premium API access","low fee API","x402 API","pay per call API","USDC API","Base network API","micropayment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Request body format and response structure are completely unknown","The endpoint name 'Premium API Access' is generic and does not describe actual functionality","Crawled /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","Cannot verify what '/api/v1/messages/20' actually does — it may be a placeholder or demo endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/20","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/20","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 documentation of request/response formats, no examples, and the crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The purpose of '/api/v1/messages/20' is not explained beyond the generic label 'Premium API 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'/request':18,36 '0.02':17,35,124,136,191 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '20':127 '300':159 '6':134 'Base network API' 'USDC API' 'accept':138 'access':121 'addit':165 'address':150 'advertis':164 'ai':12,30 'ai/ml':55 'analysi':169 'analyt':54 'api':5,23,43,77,120 'application/json':144 'avail':207 'base':8,26,73,129,153 'broad':48 'broader':162 'call':4,22,126 'caller':94 'chain':110 'classif':172 'collect':49 'commit':85 'convers':184 'cost':123 'cover':10,28 'crawl':210 'data':53,58 'decim':135 'detail':200 'document':201 'embed':173 'enabl':42 'endpoint':51,63,113,166,223 'estim':181 'everi':62 'exact':214 'exampl':203 'exchang':176 'feed':175 'financ':13,31 'finance/web3':57 'format':219 'gas':180 'generat':186 'geocod':182 'handl':89 'header':100 'howev':196 'http':139 'includ':95,167 'infer':56 'infrastructur':60 'input':215 'json-response' 'key':78 'limit':81 'list':117 'low fee API' 'lowpaymentfee.com':37 'maximum':156 'messag':11,29 'messaging-api' 'micropayment API' 'minimum':84 'network':74 'no-api-key' 'no-rate-limit' 'offer':46 'on-chain':108 'openapi':198 'page':211 'paramet':216 'pay':2,20,66 'pay per call API' 'pay-per-cal':1,19 'pay-per-request':65 'payload':205 'payment':87,99,146 'per':3,21,67,125,192 'platform':44,163 'point':195 'post':140 'premium':119 'premium API access' 'price':174,194 'protocol':93 'quot':179 'rate':80,177 'remain':224 'request':68,103,141,193 'request/response':204 'requir':86 'respons':218 'return':143 'schema':199 'second':160 'sent':148 'sentiment':168 'server':106 'settl':107 'span':52 'specif':112,222 'suit':6,24 'summar':171 'text':170 'timeout':157 'token':178 'unit':130 'unknown':225 'usdc':9,27,70,132 'usdc-base' 'use':69 'util':15,33,61 'valid':183 'via':90 'x':98 'x-payment':97 'x402':41,92 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"2c9e6b14-c1be-4e40-9daa-c85e0588d1a9","listingId":"42cdc404-515a-43c7-aa4d-0fd45142ca9a","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.771Z"}],"sources":[{"listingId":"42cdc404-515a-43c7-aa4d-0fd45142ca9a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.771Z","lastSeenAt":"2026-04-22T02:32:07.738Z"}],"details":{"listingId":"42cdc404-515a-43c7-aa4d-0fd45142ca9a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/20 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/20"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/20"},{"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 across Data & Analytics, AI & ML, 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 on-chain-settled API calls into agent workflows","Accessing a suite of utility, AI, and finance endpoints with uniform pricing"],"bestFor":["Developers wanting keyless, pay-as-you-go API access settled on Base","AI agents that can autonomously pay for API calls via x402","Projects needing low-friction access to multiple endpoint categories at uniform pricing"],"notFor":["High-volume use cases where per-request crypto settlement overhead matters","Users who need detailed API documentation and guaranteed SLAs","Applications requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.437Z"},"updatedAt":"2026-04-22T02:32:07.738Z"}}