{"id":"4ad501aa-7ac0-4ce8-843d-73e98a0d4688","shortId":"xyNSJC","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-enabled API endpoints spanning four 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, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/messages/44` is described as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint returns application/json.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. Because of this, the exact functionality of the `/messages/44` endpoint is unclear; it may be a messaging or content-delivery endpoint, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","analytics","finance-data","geocoding","data-export","no-api-key"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","cheap api","402 payment api"],"warnings":["No API documentation available — /api, /pricing, and /README pages all return only a 'Connect wallet' prompt","The exact purpose and expected request body for /api/v1/messages/44 are unknown; 'Premium API Access' is the only description","No OpenAPI spec, no output schema beyond mime type, no example responses available","Cannot verify actual functionality behind the endpoint without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/44","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/44","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 documentation, no request/response schema, no examples, and the purpose of the specific /messages/44 path is unexplained. Effectively a stub 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'/api/v1/messages/44':116 '/messages/44':214 '/pricing':191 '/readme':193 '/request':18,36 '0.02':17,35,88,147 '000':136 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '0x8335':141 '20':135 '2913':142 '300':161 '402 payment api' '6':151 'accept':124 'access':122 'addit':204 'address':157 'advertis':130 'ai':11,29,57 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':61 'analyt':12,30,51 'analytics' 'api':5,23,45,103,121 'application/json':167 'avail':175 'base':8,26,96,137,144 'base network api' 'call':4,22 'categori':49 'challeng':129 'cheap api' 'classif':64 'collect':40 'commit':111 'connect':199 'content':205,225 'content-deliveri':224 'convers':81 'cost':133 'cover':10,28 'data':50,54 'data-export' 'decim':152 'deliveri':226 'describ':118 'descript':185 'document':168 'embed':65 'enabl':44 'endpoint':46,84,114,165,176,215,227 'equal':146 'estim':75 'exact':210 'exampl':188 'exchang':70 'export':55 'feed':69 'financ':13,31,66 'finance-data' 'four':48 'function':211 'gas':74 'generat':82 'geocod':79 'geocoding' 'given':148 'host':38 'infrastructur':77 'insight':56 'key':104 'land':172 'learn':59 'limit':107 'list':174 'low payment fee' 'lowpaymentfee.com':37 'machin':58 'maximum':132 'may':219 'messag':222 'metric':52 'micropayment api' 'minim':170 'network':97 'no-api-key' 'page':173,194 'paramet':184 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payabl':91 'payment':153 'per':3,21,89 'post':125 'premium':120 'price':68,86,178 'prompt':201 'protocol':101 'provid':180 'quot':73 'rate':71,106 'report':53 'request':90,126 'request/response':182 'resolv':196 'return':166 'schema':183 'second':162 'sent':155 'sentiment':60 'span':47 'specif':113 'specul':231 'suit':6,24 'summar':63 'text':62 'timeout':163 'token':72 'unclear':217 'unit':138 'upfront':110 'usag':187 'usdc':9,27,93,140,149 'usdc api' 'usdc-base' 'util':15,33,78 'valid':80 'via':98 'wallet':200 'web3':67 'x402':43,100,128 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"09e64e14-4063-478b-b2e3-2676a69d91cd","listingId":"4ad501aa-7ac0-4ce8-843d-73e98a0d4688","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.957Z"}],"sources":[{"listingId":"4ad501aa-7ac0-4ce8-843d-73e98a0d4688","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.957Z","lastSeenAt":"2026-04-22T02:32:08.014Z"}],"details":{"listingId":"4ad501aa-7ac0-4ce8-843d-73e98a0d4688","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/44 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/44","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":"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 x402 challenge for /api/v1/messages/44 advertises maxAmountRequired of 20000 base units of USDC (USD Coin) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/messages/44"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Retrieving real-time financial data such as token quotes, gas estimates, and exchange rates","Running analytics queries and exporting data on a per-request payment basis","Geocoding and data validation via utility endpoints","Agent-driven workflows that need frictionless, wallet-based API access"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle USDC payments on Base automatically","Prototyping and low-volume use cases where $0.02/call is cost-effective"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime","Users without a Base-compatible USDC wallet","Applications requiring detailed API documentation or strict schema contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.192Z"},"updatedAt":"2026-04-22T02:32:08.014Z"}}