{"id":"dedb1e6f-a57d-447a-a005-31843f13087e","shortId":"LgMuZe","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 catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/91` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader 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 beyond the landing page is extremely thin: the /docs, /pricing, /api, 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 example payloads available. The actual functionality behind each endpoint is unclear without further testing.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","no-api-key","post-method","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","serverless API marketplace"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no technical content","No OpenAPI or JSON schema describing request parameters or response format for any endpoint","The purpose and behavior of /api/v1/transactions/91 ('Premium API Access') is not explained anywhere","The broad catalog of endpoints (AI, finance, utilities) is advertised but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/91","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/91","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 402 challenge, confirming it accepts USDC payments on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no example payloads, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The actual functionality of this specific endpoint ('Premium API Access' at /transactions/91) is entirely 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'/api/v1/transactions/91':104 '/docs':197 '/pricing':198 '/readme':201 '/request':13,30 '0.02':12,29,63,125,184 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '20':119 '300':143 '402':114 '6':130 'Base network API' 'USDC micropayment API' 'accept':148 'access':110 'actual':230 'addit':158 'address':139 'advertis':157 'ai-inference' 'ai/ml':53 'analysi':162 'analyt':52 'api':5,15,22,32,41,81,109 'application/json':153 'attach':92 'avail':228 'base':8,25,71,121,133 'behind':232 'beyond':189 'broad':46 'broader':155 'call':4,21 'caller':90 'catalog':47 'challeng':115 'classif':165 'commit':89 'connect':207 'convers':177 'cost':62 'crypto-paid API' 'data':51,56 'data-analytics' 'decim':131 'detail':214 'document':188,223 'embed':166 'enabl':40 'endpoint':49,61,102,147,159,234 'estim':174 'everi':60 'exampl':226 'exchang':169 'extrem':194 'feed':168 'finance-data' 'finance/web3':55 'function':231 'gas':173 'generat':179 'geocod':175 'header':96 'howev':187 'includ':160 'infer':54 'json-api' 'key':16,33,82 'land':191 'limit':85 'list':106 'lowpaymentfee' 'lowpaymentfee.com':35 'network':9,26,72 'no-api-key' 'offer':44 'openapi':218 'page':192,202 'paid':66 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payload':227 'payment':76,95,135 'per':3,20,64 'platform':6,23,42,156 'point':186 'post':149 'post-method' 'premium':108 'price':167,185 'prompt':209 'protocol':77 'quot':172 'rate':84,170 'render':204 'request':65,99,116,150 'request/response':221 'requir':17,34 'return':112,152 'schema':222 'second':144 'sentiment':161 'serverless API marketplace' 'servic':59 'settl':137 'simpli':91 'sinc':127 'span':50 'spec':219 'specif':101 'summar':164 'technic':213 'test':239 'text':163 'thin':195 'timeout':145 'token':171 'unclear':236 'unit':122 'upfront':88 'usd':126 'usdc':68,124,128 'usdc-base' 'use':129 'util':58 'utility-services' 'valid':176 'via':10,27,73 'wallet':208 'without':237 'x402':11,28,39,75,94 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"96976d34-24aa-4106-b78f-fc23ac3e56f3","listingId":"dedb1e6f-a57d-447a-a005-31843f13087e","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:11.255Z"}],"sources":[{"listingId":"dedb1e6f-a57d-447a-a005-31843f13087e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:11.255Z","lastSeenAt":"2026-04-22T16:32:15.320Z"}],"details":{"listingId":"dedb1e6f-a57d-447a-a005-31843f13087e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/91 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/transactions/91"},{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/91"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis","Integrating agent-purchasable API calls into autonomous workflows via x402"],"bestFor":["Developers or agents wanting instant API access without signup or API keys","Low-volume or sporadic usage where per-call pricing is more economical than subscriptions","x402-compatible agents that can autonomously pay for API calls on Base"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, request schemas, or SLA guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.819Z"},"updatedAt":"2026-04-22T16:32:15.320Z"}}