{"id":"42b32326-2e6e-45d3-9fbc-36271c7f9a7d","shortId":"XNuyZ5","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and 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 minimum commitments — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/messages/8` 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. 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 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/8` (and most other endpoints) must be discovered experimentally.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request/response formats are undocumented","The purpose of /api/v1/messages/8 specifically is unclear; 'Premium API Access' is a generic label","All doc pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","Example request JSON is inferred/guessed — no schema was provided by the endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/8","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/8","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 documented request/response schema, no examples, and all secondary pages just show 'Connect wallet'. The exact purpose of /api/v1/messages/8 is unknown beyond the generic label 'Premium API 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'/api/v1/messages/8':116,234 '/pricing':197 '/readme':199 '/request':19,38 '0.02':18,37,70,141,185 '000':131 '0x8335':136 '20':130 '402 payment required' '6':145 'accept':149 'access':122 'addit':210 'advertis':126 'ai':12,31,57 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'also':158 'analysi':163 'analyt':56 'api':5,24,45,87,121 'application/json':154 'attach':98 'base':8,27,78,132,138 'base network api' 'beyond':189 'broad':50 'broader':156 'call':4,23 'caller':96 'challeng':125 'classif':166 'collect':51 'commit':95 'connect':205 'convers':178 'conversion' 'cover':10,29 'crypto-gas-estimates' 'data':11,30,55 'data-analytics' 'decim':146 'detail':212 'discov':241 'document':188 'embed':167 'enabl':44 'endpoint':16,35,53,66,114,148,160,238 'equal':140 'estim':175 'everi':65 'exact':227 'exampl':220 'exchang':170 'exchange-rates' 'experiment':242 'expos':159 'feed':169 'financ':13,32,60 'finance-price-feeds' 'format':229 'gas':174 'generat':180 'geocod':176 'geocoding' 'given':142 'header':103 'http':150 'infrastructur':63 'input':228 'key':88 'land':191 'learn':59 'limit':91 'list':118 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':58 'maxamountrequir':128 'micropayment api' 'minimum':94 'must':239 'network':79 'offer':48 'openapi':214 'page':192 'paid':73 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':102,107 'per':3,22,71 'platform':46,157 'point':187 'post':151 'premium':120 'price':68,168,186 'prompt':207 'proof':108 'protocol':83 'publish':222 'quot':173 'rate':90,171 'request':72,111 'request/response':216 'resolv':202 'respons':231 'return':153 'rout':200 'schema':217 'sentiment':162 'simpli':97 'span':54 'spars':194 'spec':215 'specif':113 'structur':232 'suit':6,25 'summar':165 'technic':211 'text':164 'token':172 'unit':133 'usag':219 'usdc':9,28,75,135,143 'usdc api' 'usdc-base' 'util':15,34,64 'valid':106,177 'validation' 'via':80 'wallet':206 'web3':61 'x':101 'x-payment':100 'x402':43,82,124 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"6ddf0be4-d371-4e11-bf60-6f139d3bcfb9","listingId":"42b32326-2e6e-45d3-9fbc-36271c7f9a7d","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.898Z"}],"sources":[{"listingId":"42b32326-2e6e-45d3-9fbc-36271c7f9a7d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.898Z","lastSeenAt":"2026-04-22T02:32:07.937Z"}],"details":{"listingId":"42b32326-2e6e-45d3-9fbc-36271c7f9a7d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/8 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{\"message\": \"hello\"}'","exampleRequest":{"message":"hello"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/8"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/8"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) without managing API keys","Running lightweight AI inference (sentiment, summarization, classification, embeddings) on a per-request payment basis","Geocoding addresses or validating/converting data via utility endpoints","Integrating pay-as-you-go API calls into autonomous agent workflows on Base"],"bestFor":["Agents or scripts that need keyless, on-demand API access paid in USDC","Low-volume or bursty workloads where per-request pricing avoids subscription overhead","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.304Z"},"updatedAt":"2026-04-22T02:32:07.937Z"}}