{"id":"9c10ed9c-cd23-4dbf-867b-cbee1d21e653","shortId":"A2fasv","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform 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 catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. No API keys, accounts, or rate limits are required — callers simply attach an X-PAYMENT header with a valid payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/transactions/188` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a maxAmountRequired 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 is discoverable. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises 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. Documentation pages (docs, pricing, README) were largely empty during crawl, returning only a \"Connect wallet\" prompt, so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","crypto api gateway","402 payment api"],"warnings":["Documentation pages (/docs, /pricing, /README) are effectively empty — only showing 'Connect wallet'","No request or response schema available for any endpoint","The specific purpose of /api/v1/transactions/188 is unclear; it may be a generic or placeholder endpoint","The broad catalog of advertised endpoints (AI, finance, geo, etc.) could not be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/188","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/transactions/188","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). However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only 'Connect wallet' with no substantive content. The purpose of this specific /transactions/188 path is unclear beyond the generic 'Premium API Access' 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'/request':19,38 '0.02':18,37,70,144,199 '000':133 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':164 '0x8335':138 '20':132 '2913':139 '300':167 '402 payment api' '6':148 'accept':152 'access':108,121 'account':88 'actual':220 'address':163 'advertis':128,173 'ai':12,31,57 'ai-inference' 'analysi':177 'analyt':56 'api':5,24,45,86,120 'application/json':124 'attach':96 'base':8,27,78,134,141 'base usdc api' 'broad':50 'broader':171 'call':4,23 'caller':94 'catalog':51 'challeng':127 'classif':180 'classification' 'connect':215 'convers':192 'conversion' 'cover':10,29 'crawl':211 'crypto api gateway' 'crypto-quotes' 'data':11,30,55 'data-analytics' 'decim':149 'discover':157 'doc':204 'document':202 'embed':181 'embeddings' 'empti':209 'enabl':44 'endpoint':16,35,53,66,110,113,151,174,225 'equal':143 'estim':189 'everi':65 'exchang':184 'feed':183 'financ':13,32,60 'finance-data' 'gas':188 'gas-estimates' 'generat':194 'geocod':190 'geocoding' 'given':145 'header':101 'http':153 'individu':224 'infrastructur':63 'key':87 'larg':208 'learn':59 'limit':91 'list':117 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'maxamountrequir':130 'micropayment api' 'network':79 'offer':48 'page':203 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':83,100,105,159 'per':3,22,71 'platform':6,25,46,172 'point':201 'post':154 'premium':119 'price':68,182,200,205 'prompt':217 'proof':106 'protocol':84 'quot':187 'rate':90,185 'readm':206 'request':72 'request/response':221 'requir':93 'return':123,212 'schema':222 'second':168 'sent':161 'sentiment':176 'sentiment-analysis' 'settl':73 'simpli':95 'span':54 'specif':112 'summar':179 'text':178 'text-summarization' 'timeout':169 'token':186 'unit':135 'unknown':227 'usdc':9,28,75,137,146 'usdc-base' 'util':15,34,64 'valid':104,191 'validation' 'via':80 'wallet':216 'web3':61 'x':99 'x-payment':98 'x402':43,82,126 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"ba0389ae-0d2d-4a18-9a6e-c22b54aa09f3","listingId":"9c10ed9c-cd23-4dbf-867b-cbee1d21e653","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/transactions/188","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:01.829Z"}],"sources":[{"listingId":"9c10ed9c-cd23-4dbf-867b-cbee1d21e653","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/188","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:01.829Z","lastSeenAt":"2026-04-22T21:31:37.274Z"}],"details":{"listingId":"9c10ed9c-cd23-4dbf-867b-cbee1d21e653","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/188 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises endpoints across data, AI, finance, and infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/188"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/188"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes or gas estimates with per-call USDC micropayments","Geocoding or data validation as a utility service paid per request on Base"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","Use cases requiring very small per-call costs ($0.02) settled on-chain","Projects already operating on the Base L2 network with USDC"],"notFor":["High-volume workloads where $0.02/request adds up and bulk pricing is needed","Users who need detailed API documentation or guaranteed SLAs before integrating","Callers without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.402Z"},"updatedAt":"2026-04-22T21:31:37.274Z"}}