{"id":"8613510b-a691-4c5a-8e40-f5b0a540cd3d","shortId":"H2acaq","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 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, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/80` is listed as \"Premium API Access.\" 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. The endpoint accepts HTTP POST and returns `application/json`. The broader platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README routes all resolve to a \"Connect wallet\" prompt with no additional technical detail. No OpenAPI spec, request/response schemas, or usage examples are published. Because of this, the exact input format and response structure for `/api/v1/messages/80` (and most other endpoints) must be discovered experimentally.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","data-analytics","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","data-export","text-generation"],"categories":["llm","finance","geo","utilities"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required","crypto api gateway"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","The /api, /pricing, and /README pages return only a 'Connect wallet' prompt with no content","The exact functionality of /api/v1/messages/80 is undocumented; 'Premium API Access' is a generic label","Example request JSON is inferred/guessed — not sourced from documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/80","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schemas, and no usage examples. The /api, /pricing, and /README pages are all empty wallet-connect stubs. The specific purpose of /api/v1/messages/80 is unclear beyond the generic label 'Premium API 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'/api/v1/messages/80':108,229 '/pricing':192 '/readme':194 '/request':18,36 '0.02':17,35,68,135,180 '000':124 '0x8335':129 '20':123 '2913':130 '402 payment required' '6':139 'accept':143 'access':114 'addit':205 'advertis':118 'ai':11,29 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'also':152 'analysi':157 'analyt':12,30,54 'api':5,23,43,85,113 'application/json':148 'attach':96 'base':8,26,76,125,132 'base network api' 'beyond':184 'broad':48 'broader':150 'call':4,22 'caller':94 'challeng':117 'classif':160 'collect':49 'commit':93 'connect':200 'convers':172 'cost':121 'cover':10,28 'crypto api gateway' 'crypto-gas-estimates' 'data':53,58,174 'data-analytics' 'data-export' 'decim':140 'detail':207 'discov':236 'document':183 'embed':161 'enabl':42 'endpoint':51,64,106,142,154,233 'equal':134 'estim':169 'everi':63 'exact':222 'exampl':215 'exchang':164 'exchange-rates' 'experiment':237 'expos':153 'feed':163 'financ':13,31 'finance-price-feeds' 'finance/web3':57 'format':224 'gas':168 'general':60 'generat':175 'geocod':170 'geocoding' 'given':136 'header':100 'http':144 'infer':56 'infrastructur':61 'input':223 'key':86 'land':186 'limit':89 'list':110 'low payment fee' 'lowpaymentfee.com':37 'maximum':120 'micropayment api' 'must':234 'network':77 'offer':46 'openapi':209 'page':187 'paid':71 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':99 'per':3,21,69 'platform':44,151 'point':182 'post':145 'premium':112 'price':66,162,181 'prompt':202 'protocol':81 'publish':217 'quot':167 'rate':88,165 'request':70,103 'request/response':211 'resolv':197 'respons':226 'return':147 'rout':195 'schema':212 'sentiment':156 'simpli':95 'span':52 'spars':189 'spec':210 'specif':105 'structur':227 'suit':6,24 'summar':159 'technic':206 'text':158 'text-generation' 'token':166 'unit':126 'upfront':92 'usag':214 'usdc':9,27,73,128,137 'usdc api' 'usdc-base' 'util':15,33,62 'valid':171 'via':78 'wallet':201 'x402':41,80,98,116 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"1f10592f-7505-42cc-bb47-c224436c4974","listingId":"8613510b-a691-4c5a-8e40-f5b0a540cd3d","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.209Z"}],"sources":[{"listingId":"8613510b-a691-4c5a-8e40-f5b0a540cd3d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.209Z","lastSeenAt":"2026-04-22T02:32:08.279Z"}],"details":{"listingId":"8613510b-a691-4c5a-8e40-f5b0a540cd3d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/80 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{\"message\": \"Hello\"}'","exampleRequest":{"message":"Hello"},"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 the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/messages/80 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/80"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"The /api, /pricing, and /README pages show only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/api"}],"useCases":["Running AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates on a per-call payment basis","Geocoding addresses or validating data with zero signup friction","Exporting analytics data or generating reports with micropayments"],"bestFor":["Agents or bots that need frictionless, keyless API access paid per call","Developers prototyping against multiple API categories without subscription overhead","Web3-native applications already holding USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up (no bulk discounts documented)","Users who need detailed API documentation, SLAs, or guaranteed uptime","Callers without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.829Z"},"updatedAt":"2026-04-22T02:32:08.279Z"}}