{"id":"068eb848-de78-4799-a4a2-5c4daa220154","shortId":"mJvxUm","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/55` 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 POST requests 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 pages all resolve to a \"Connect wallet\" prompt with no further 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/55` (and most other endpoints) must be discovered experimentally.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-json","no-api-key","no-rate-limit","analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-apis"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","pay per call API","x402 API","USDC API","Base network API","micropayment API","premium API access","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","The /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no useful content","The specific purpose of /api/v1/messages/55 ('Premium API Access') is not explained anywhere","The broad range of advertised endpoints (AI, finance, analytics, utilities) could not be independently verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/55","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/55","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 no examples. The purpose of /api/v1/messages/55 specifically is opaque. Effectively a stub 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'/api/v1/messages/55':104,224 '/pricing':187 '/readme':189 '/request':18,36 '0.02':17,35,68,131,175 '000':120 '0x8335':125 '20':119 '2913':126 '6':135 'Base network API' 'USDC API' 'accept':139 'access':110 'advertis':114 'ai':12,30 'ai-inference' 'ai/ml':55 'also':148 'analysi':153 'analyt':11,29,54 'analytics' 'api':5,23,43,81,109 'application/json':144 'attach':92 'base':8,26,76,121,128 'beyond':179 'broad':48 'broader':146 'call':4,22 'caller':90 'challeng':113 'classif':156 'classification' 'collect':49 'commit':89 'connect':195 'convers':168 'cost':117 'cover':10,28 'crypto-data' 'data':53,58 'decim':136 'detail':202 'discov':231 'document':178 'embed':157 'embeddings' 'enabl':42 'endpoint':51,64,102,138,150,228 'equal':130 'estim':165 'everi':63 'exact':217 'exampl':210 'exchang':160 'experiment':232 'expos':149 'feed':159 'financ':13,31 'finance-data' 'finance/web3':57 'format':219 'gas':164 'general':60 'generat':170 'geocod':166 'geocoding' 'given':132 'header':96 'infer':56 'infrastructur':61 'input':218 'key':82 'land':181 'limit':85 'list':106 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':37 'maximum':116 'micropayment API' 'minimum':88 'must':229 'network':77 'no-api-key' 'no-rate-limit' 'offer':46 'openapi':204 'page':182,190 'pay':2,20 'pay per call API' 'pay-per-cal':1,19 'payment':95 'per':3,21,69 'per-request-billing' 'platform':44,147 'point':177 'post':140 'post-json' 'premium':108 'premium API access' 'price':66,158,176 'prompt':197 'publish':212 'quot':163 'rate':84,161 'request':70,99,141 'request/response':206 'resolv':192 'respons':221 'return':143 'schema':207 'sentiment':152 'sentiment-analysis' 'settl':71 'simpli':91 'span':52 'spars':184 'spec':205 'specif':101 'structur':222 'suit':6,24 'summar':155 'technic':201 'text':154 'text-summarization' 'token':162 'unit':122 'usag':209 'usdc':9,27,73,124,133 'usdc-base' 'util':15,33,62 'utility-apis' 'valid':167 'wallet':196 'x402':41,94,112 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"6bfa6cc2-7b38-47a1-b6eb-daab4fd2474d","listingId":"068eb848-de78-4799-a4a2-5c4daa220154","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/55","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":"068eb848-de78-4799-a4a2-5c4daa220154","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/55","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":"068eb848-de78-4799-a4a2-5c4daa220154","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/55 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/55","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 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/55"},{"claim":"Platform advertises 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 managing API keys","Fetching real-time crypto token quotes or gas estimates with per-call USDC payments","Geocoding addresses or validating data via lightweight utility endpoints","Exporting analytics data or generating insights on demand"],"bestFor":["Agents or bots that need keyless, pay-as-you-go API access","Developers prototyping with multiple API categories under one provider","Low-volume or bursty workloads where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request crypto settlement adds latency and cost overhead","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.288Z"},"updatedAt":"2026-04-22T02:32:08.014Z"}}