{"id":"d4856bdd-32a4-4961-99a9-0cb56d676683","shortId":"yVct7Q","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 broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/213` is listed as \"Premium API Access\" and 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 POST requests and returns application/json. The broader platform also 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.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind this particular `/api/v1/transactions/213` endpoint is unclear — the description is generic (\"Premium API Access\") and does not specify what data or service it provides.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","json-api","post-method","no-api-key","no-rate-limits"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","serverless API billing"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose of /api/v1/transactions/213 ('Premium API Access') is not explained anywhere","No request body schema or response schema documented — callers cannot know what to send or expect back","The broader platform lists many endpoints (AI, finance, utils) but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/213","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/213","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the endpoint's actual purpose ('Premium API Access' for /api/v1/transactions/213) is vague and 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'/api/v1/transactions/213':100,216 '/docs':179 '/pricing':180 '/readme':183 '/request':13,28 '0.02':12,27,74,127,171 '000':116 '0x8335':121 '20':115 '2913':122 '6':131 'Base network API' 'USDC micropayment API' 'accept':135 'access':106,226 'account':80 'actual':211 'advertis':111,145 'ai/ml':49 'also':144 'analysi':149 'analyt':48 'api':5,20,37,78,105,225 'application/json':140 'attach':88 'avail':209 'base':8,23,67,117,124 'behind':213 'broad':42 'broader':142 'call':4,19,76 'caller':86 'challeng':110 'classif':152 'connect':189 'content':195 'convers':164 'crypto-paid API' 'data':47,52,232 'decim':132 'descript':221 'document':174,204 'embed':153 'enabl':36 'endpoint':45,57,98,134,146,217 'equal':126 'estim':161 'exampl':207 'exchang':156 'extrem':176 'feed':155 'finance/web3':51 'flat':71 'function':212 'gas':160 'generat':166 'generic':223 'geocod':162 'given':128 'header':92 'infer':50 'json-api' 'key':79 'limit':83 'list':102 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':113 'network':9,24,68 'no-api-key' 'no-rate-limits' 'offer':40 'openapi':199 'page':184 'paid':59 'particular':215 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'payload':208 'payment':91 'per':3,18,61,75 'per-request':60 'per-request-billing' 'platform':6,21,38,143 'point':173 'post':136 'post-method' 'premium':104,224 'price':154,172 'prompt':191 'provid':236 'quot':159 'rate':72,82,157 'render':186 'request':62,95,137 'request/response':202 'requir':85 'return':139 'schema':203 'sentiment':148 'serverless API billing' 'servic':55,234 'set':43 'simpli':87 'span':46 'spars':177 'spec':200 'specif':97 'specifi':230 'summar':151 'text':150 'token':158 'unclear':219 'unit':118 'usdc':15,30,64,120,129 'usdc-base-network' 'use':63 'util':54 'valid':163 'via':10,25 'wallet':190 'x402':11,26,35,90,109 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"f6d1039b-09dd-44e3-9231-495dd9b365bc","listingId":"d4856bdd-32a4-4961-99a9-0cb56d676683","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/213","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:19.308Z"}],"sources":[{"listingId":"d4856bdd-32a4-4961-99a9-0cb56d676683","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/213","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:19.308Z","lastSeenAt":"2026-04-23T17:32:16.038Z"}],"details":{"listingId":"d4856bdd-32a4-4961-99a9-0cb56d676683","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/213 \\\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":"Flat pricing of $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","source_url":"https://lowpaymentfee.com/api/v1/transactions/213"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing paid API endpoints without creating accounts or managing API keys","Making one-off API calls with per-request USDC micropayments on Base","Integrating pay-as-you-go data or utility services into agent workflows"],"bestFor":["Developers who want zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-friction, small-denomination API billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who want bulk pricing or subscription discounts","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.595Z"},"updatedAt":"2026-04-23T17:32:16.038Z"}}