{"id":"aed305de-901b-421c-85c8-fd1ec4bd5ed8","shortId":"r2b4dc","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, 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 general infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/29` is listed as \"Premium API Access\" and follows the same x402 payment pattern. Its exact functionality is not documented beyond the generic title; it accepts HTTP POST and returns `application/json`. The broader platform advertises endpoints such as sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nPayment is handled via the x402 \"exact\" scheme: the caller must include an `X-PAYMENT` header satisfying a challenge for 20,000 base units of USDC (6 decimals → $0.02) sent to the specified payTo address on Base. The endpoint returned a valid 402 challenge during probing, confirming it is live.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","crypto-quotes","gas-estimates","geocoding","validation"],"categories":["llm","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","cheap api","no api key"],"warnings":["The exact purpose and input/output schema of /api/v1/messages/29 are undocumented — the name 'Premium API Access' is generic and uninformative.","No OpenAPI spec, README, or detailed docs were found; /pricing and /README pages only show a wallet-connect prompt.","The platform lists many endpoints but provides no documentation on request formats or response structures for any of them.","Cannot verify whether the advertised AI, finance, and utility endpoints actually function as described."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/29","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (valid 402 challenge returned) and pricing is clear ($0.02 USDC on Base). However, the specific /api/v1/messages/29 endpoint has no documentation beyond the generic title \"Premium API Access\", no request/response schema, and no examples. The broader site's /api, /pricing, and /README pages returned only a wallet-connect prompt with no useful 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'/request':18,36 '0.02':17,35,68,162,194 '000':187 '20':186 '402':208 '6':192 'accept':129 'access':110 'address':200 'advertis':138 'ai':12,30 'ai-inference' 'ai/ml':55 'analysi':143 'analyt':11,29,54 'api':5,23,43,81,109 'application/json':134 'attach':92 'base':8,26,76,188,202 'base network api' 'beyond':124 'broad':48 'broader':136 'call':4,22 'caller':90,174 'challeng':184,209 'cheap api' 'classif':146 'classification' 'collect':49 'commit':89 'confirm':212 'convers':154 'cover':10,28 'crypto-quotes' 'data':53,58,156 'data-analytics' 'decim':193 'document':123 'embed':147 'embeddings' 'enabl':42 'endpoint':51,64,102,139,204 'everi':63 'exact':119,171 'exchang':150 'exchange-rates' 'export':157 'feed':149 'financ':13,31 'finance-data' 'finance/web3':57 'follow':112 'function':120 'gas-estimates' 'general':60 'generic':126 'geocod':152 'geocoding' 'handl':167 'header':96,181 'http':130 'includ':176 'infer':56 'infrastructur':61 'key':82 'limit':85 'list':106 'live':215 'low payment fee' 'lowpaymentfee.com':37 'micropayment api' 'minimum':88 'must':175 'network':77 'no api key' 'offer':46 'pattern':117 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':95,116,165,180 'payto':199 'per':3,21,69 'platform':44,137 'point':164 'post':131 'premium':108 'price':66,148,163 'probe':211 'rate':84,151 'request':70,99 'return':133,205 'satisfi':182 'scheme':172 'sent':195 'sentiment':142 'sentiment-analysis' 'settl':71 'simpli':91 'span':52 'specif':101 'specifi':198 'suit':6,24 'summar':145 'text':144 'text-summarization' 'titl':127 'unit':189 'usdc':9,27,73,191 'usdc api' 'usdc-base' 'util':15,33,62 'valid':153,207 'validation' 'via':168 'x':179 'x-payment':178 'x402':41,94,115,170 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"b32cb673-9a18-4d4b-ada2-746717bad29a","listingId":"aed305de-901b-421c-85c8-fd1ec4bd5ed8","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.550Z"}],"sources":[{"listingId":"aed305de-901b-421c-85c8-fd1ec4bd5ed8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.550Z","lastSeenAt":"2026-04-22T10:03:03.198Z"}],"details":{"listingId":"aed305de-901b-421c-85c8-fd1ec4bd5ed8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/29 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/29","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/29"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/29"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Running one-off AI inference tasks (sentiment, summarization, classification) without signing up for an account","Fetching real-time crypto quotes, gas estimates, or exchange rates with per-call billing","Geocoding addresses or validating data on demand via micropayments","Exporting analytics data or generating insights without subscription commitments"],"bestFor":["Agents or bots that need instant, keyless access to diverse API endpoints","Developers who want pay-as-you-go pricing without rate limits","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up quickly compared to subscription plans","Users who need detailed documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.884Z"},"updatedAt":"2026-04-22T10:03:03.198Z"}}