{"id":"e3d8dca1-5dae-41a1-a643-520dab45a818","shortId":"JxTCan","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","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 utility services. All endpoints are paid per-request at $0.02 each using USDC on the Base network, with no API keys, rate limits, or subscriptions required. The x402 protocol handles payment inline: callers attach a payment header and the server fulfills the request upon verification.\n\nThe specific endpoint at `/api/v1/transactions/397` is listed as \"Premium API Access\" and accepts POST requests. 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 platform also offers 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 is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed descriptions of what each endpoint actually returns. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without documentation it is unclear what input the `/api/v1/transactions/397` endpoint expects or what data it returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","no-api-key","post-endpoint","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/transactions/397 is unclear; 'Premium API Access' is a generic label","The site lists many endpoints but none have documented input/output contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/397","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/397","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint does beyond the generic label 'Premium API Access'. The listing is effectively a 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'/request':13,30 '0.02':12,29,68,138,173 '000':127 '0x8335':132 '20':126 '2913':133 '402':222 '6':142 'Base network API' 'USDC API' 'accept':116 'access':114 'actual':214 'advertis':122 'ai/ml':53 'also':146 'analysi':151 'analyt':52 'api':5,15,22,32,41,78,113,182 'attach':92 'base':8,25,74,128,135 'broad':46 'call':4,21 'caller':91 'challeng':121,227 'classif':154 'collect':47 'confirm':219 'connect':191 'content':197 'convers':166 'crypto-paid API' 'data':51,56,242 'decim':143 'descript':209 'detail':208 'doc':181 'document':176,230 'embed':155 'enabl':40 'endpoint':49,61,106,148,213,217,238 'equal':137 'estim':163 'exampl':205 'exchang':158 'expect':239 'extrem':178 'feed':157 'finance/web3':55 'fulfil':99 'gas':162 'generat':168 'geocod':164 'given':139 'handl':88 'header':95 'infer':54 'inlin':90 'input':235 'json-response' 'key':16,33,79 'limit':81 'list':110 'live':220 'lowpaymentfee' 'lowpaymentfee.com':35 'maxamountrequir':124 'micropayment API' 'network':9,26,75 'no-api-key' 'offer':44,147 'openapi':201 'page':186 'paid':63 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'payment':89,94 'per':3,20,65 'per-request':64 'per-request-billing' 'platform':6,23,42,145 'point':175 'post':117 'post-endpoint' 'premium':112 'price':156,174,183 'prompt':193 'protocol':87 'quot':161 'rate':80,159 'readm':185 'render':188 'request':66,101,118 'request/response':204 'requir':17,34,84 'return':215,221,244 'schema':202 'sentiment':150 'server':98 'servic':59 'span':50 'spars':179 'specif':105 'subscript':83 'summar':153 'text':152 'token':160 'unclear':233 'unit':129 'upon':102 'usdc':71,131,140 'usdc-base-network' 'use':70 'util':58 'valid':165,225 'verif':103 'via':10,27 'wallet':192 'without':229 'x402':11,28,39,86,120,226 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"6b05ca9c-9788-4833-8abf-e54681bbeead","listingId":"e3d8dca1-5dae-41a1-a643-520dab45a818","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/397","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:47.221Z"}],"sources":[{"listingId":"e3d8dca1-5dae-41a1-a643-520dab45a818","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/397","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:47.221Z","lastSeenAt":"2026-04-23T08:31:55.585Z"}],"details":{"listingId":"e3d8dca1-5dae-41a1-a643-520dab45a818","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/397 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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, instant access on 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/397"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to transaction or financial data without subscriptions"],"bestFor":["Developers who want zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API key billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.956Z"},"updatedAt":"2026-04-23T08:31:55.585Z"}}