{"id":"a4d2001b-e39c-4872-914a-7ca38f9b8afc","shortId":"jNXAcY","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each request and receive the response immediately.\n\nThe specific endpoint at `/api/v1/transactions/353` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's advertised pricing. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises additional endpoints including 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. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples of what data these endpoints actually return. The exact functionality behind the `/api/v1/transactions/353` path is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","402 payment required"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose of /api/v1/transactions/353 ('Premium API Access') is not documented","No example requests or responses available to verify actual functionality","Many advertised endpoints (AI, finance, utils) cannot be verified as functional from crawl data alone"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/353","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/353","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of the specific /transactions/353 path is unexplained. Effectively a stub 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'/request':13,28 '0.02':12,27,59,135,185 '000':119 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '0x8335':124 '20':118 '2913':125 '300':153 '402 payment required' '6':131 'Base network API' 'USDC API' 'access':109 'across':45 'actual':229 'addit':159 'address':149 'advertis':143,158 'ai-inference' 'ai/ml':48 'analysi':163 'analyt':47 'api':5,20,37,71,108,195 'attach':87 'avail':242 'base':8,23,67,120,127 'behind':234 'call':4,19,137 'caller':86 'challeng':114 'classif':166 'classification' 'commit':78 'connect':204 'consist':138 'convers':178 'data':46,226 'data-analytics' 'decim':132 'detail':211 'doc':194 'document':189,220 'embed':167 'embeddings' 'enabl':36 'endpoint':44,55,101,160,228 'equal':134 'estim':175 'exact':232 'exampl':223 'exchang':170 'extrem':191 'feed':169 'finance-data' 'finance/web3':50 'function':233 'gas':174 'generat':180 'geocod':176 'geocoding' 'handl':83 'header':90 'howev':188 'immedi':98 'includ':161 'infer':49 'infrastructur':52 'inlin':85 'key':72 'limit':75 'list':105 'low payment fee' 'lowpaymentfee.com':31 'made':147 'materi':243 'micropayment API' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':215 'page':199 'paid':62 'path':237 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':84,89,145 'per':3,18,60,136 'platform':6,21,38,157 'point':187 'premium':107 'price':57,144,168,186,196 'prompt':206 'protocol':82 'quot':173 'rate':74,171 'readm':198 'receiv':95 'render':201 'request':61,93,115 'request/response':218 'requir':79 'respons':97 'return':111,230 'schema':219 'second':154 'sentiment':162 'sentiment-analysis' 'sinc':128 'site':141 'spars':192 'spec':216 'specif':100 'summar':165 'technic':210 'text':164 'text-summarization' 'timeout':155 'token':172 'unclear':239 'unit':121 'usdc':15,30,64,123,129 'usdc-base-network' 'use':130 'util':53 'utility-services' 'valid':177 'varieti':42 'via':10,25 'wallet':205 'x402':11,26,35,81,113 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"95174d52-badb-4bcf-a431-af768bb91676","listingId":"a4d2001b-e39c-4872-914a-7ca38f9b8afc","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/353","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:18.631Z"}],"sources":[{"listingId":"a4d2001b-e39c-4872-914a-7ca38f9b8afc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/353","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:18.631Z","lastSeenAt":"2026-04-22T18:32:34.930Z"}],"details":{"listingId":"a4d2001b-e39c-4872-914a-7ca38f9b8afc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/353 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"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/transactions/353"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data like token quotes, gas estimates, and exchange rates on a per-call basis","Using utility services like geocoding, validation, and data conversion with instant crypto micropayments","Building agent workflows that pay per API call using x402 on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation and response schemas before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.276Z"},"updatedAt":"2026-04-22T18:32:34.930Z"}}