{"id":"8a5d187f-aea1-4f8e-bdab-0efa972edb07","shortId":"2QnHs6","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 exposes a broad set of endpoints across 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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/messages/30` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no sign-up required — callers simply attach an X-PAYMENT header to each POST request.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but the /api, /pricing, and /README pages all resolve to a wallet-connect stub with no further detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The purpose of the `/api/v1/messages/30` endpoint specifically is unclear — it could be a messaging or content retrieval endpoint, but no description beyond \"Premium API Access\" is provided.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/messages/30 has no description beyond 'Premium API Access' — its function is unknown","The /api, /pricing, and /README pages all return only a wallet-connect stub with no content","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/30","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/30","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/messages/30 is undocumented. Effectively a stub 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'/api/v1/messages/30':112,223 '/pricing':190 '/readme':192 '/request':19,38 '0.02':18,37,95,137 '000':127 '0x8335':132 '20':126 '402 payment api' '6':141 'access':118,243 'across':54 'advertis':122 'ai':12,31,64 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':68 'analyt':58 'api':5,24,45,117,153,242 'attach':166 'avail':183 'base':8,27,103,128,134 'base network api' 'beyond':240 'broad':50 'call':4,23 'caller':164 'categori':56 'challeng':121 'classif':71 'connect':200 'content':234 'convers':88 'conversion' 'could':229 'crypto-gas' 'data':11,30,57,61 'data-analytics' 'decim':142 'descript':239 'detail':205 'document':176,214 'embed':72 'enabl':44 'endpoint':16,35,53,91,111,184,224,236 'equal':136 'estim':82 'exact':149 'exampl':218 'exchang':77 'exchange-rates' 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-prices' 'four':55 'gas':81 'generat':89 'geocod':86 'geocoding' 'given':138 'header':171 'infrastructur':84 'insight':63 'key':154 'land':180 'learn':66 'limit':157 'list':114,182 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':145 'maxamountrequir':124 'messag':232 'metric':59 'micropayment api' 'minim':178 'network':104 'offer':10,29 'openapi':209 'page':181,193 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':143,170 'per':3,22,96 'platform':6,25,46 'post':174 'premium':116,241 'price':75,93,186 'protocol':108 'provid':245 'purpos':220 'quot':80 'rate':78,156 'report':60 'request':97,175 'request/response':212 'requir':163 'resolv':195 'retriev':235 'schema':213 'scheme':150 'sentiment':67 'set':51 'settl':98 'sign':161 'sign-up':160 'simpli':165 'spec':210 'specif':110,225 'stub':201 'summar':70 'text':69 'token':79 'unclear':227 'unit':129 'usag':217 'usdc':9,28,100,131,139 'usdc api' 'usdc-base' 'util':15,34,85 'valid':87 'validation' 'via':105,146 'wallet':199 'wallet-connect':198 'web3':74 'x':169 'x-payment':168 'x402':43,107,120,148 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"70312ded-9a08-4d80-ac7d-4af0cdfd91fd","listingId":"8a5d187f-aea1-4f8e-bdab-0efa972edb07","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.805Z"}],"sources":[{"listingId":"8a5d187f-aea1-4f8e-bdab-0efa972edb07","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.805Z","lastSeenAt":"2026-04-22T02:32:07.803Z"}],"details":{"listingId":"8a5d187f-aea1-4f8e-bdab-0efa972edb07","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/30 \\\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":"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/30 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/30"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-request data analytics into agent workflows"],"bestFor":["Agents needing low-cost, no-signup API access settled in USDC on Base","Developers prototyping with multiple lightweight API categories under one provider","Workflows requiring micropayment-gated endpoints without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where per-request crypto settlement adds overhead","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.537Z"},"updatedAt":"2026-04-22T02:32:07.803Z"}}