{"id":"ea76e459-434a-46cc-824c-531a48169aad","shortId":"t8JWYp","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request and settle in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/payments/252` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. It is unclear what specific functionality the \"Premium API Access\" endpoint at path /payments/252 provides, as it does not map to any of the named endpoints on the landing page. Agents should treat this endpoint with caution until more documentation is available.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /docs, /pricing, /api, and /README pages contain no usable content (only 'Connect wallet')","The endpoint path /api/v1/payments/252 does not correspond to any of the named endpoints listed on the landing page — its actual functionality is unknown","No request body schema or response schema is documented anywhere","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/252","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/payments/252","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 payments. However, documentation is nearly nonexistent — all subpages render only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of /api/v1/payments/252 ('Premium API Access') is unclear and doesn't match any named endpoint on the landing page. Pricing is clear ($0.02) but everything else must be 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'/api/v1/payments/252':114 '/docs':178 '/payments/252':223 '/pricing':179 '/readme':182 '/request':12,31 '0.02':11,30,99,143 '000':132 '0x8335':137 '20':131 '2913':138 'Base network API' 'USDC API' 'accept':163 'access':120,219 'across':58 'addit':193 'agent':240 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,119,153,218 'application/json':168 'avail':209,251 'base':8,27,108,133,140 'base-network' 'beyond':170 'broad':50 'call':4,23 'catalog':51 'categori':60 'caution':246 'challeng':126 'classif':75 'classification' 'connect':188 'content':195 'convers':92 'data':14,33,61,65 'data-analytics' 'document':169,204,249 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,95,112,162,220,235,244 'equal':142 'estim':86 'exact':150 'exampl':208 'exchang':81 'export':66 'extrem':175 'feed':80 'financ':16,35,77 'finance-data' 'four':59 'function':215 'gas':85 'generat':93 'geocod':90 'geocoding' 'infrastructur':88 'insight':67 'key':154 'land':172,238 'learn':70 'limit':158 'list':116 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':146 'map':229 'maxamountrequir':129 'metric':63 'micropayment API' 'name':234 'network':109 'no-api-key' 'offer':48 'openapi':199 'page':173,183,239 'path':222 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':144 'per':3,22,55,100 'platform':6,25,46 'post':164 'premium':118,217 'price':79,97 'prompt':190 'provid':224 'quot':84 'rate':82,157 'render':185 'report':64 'request':56,101,165 'request/response':202 'requir':160 'return':122,167 'schema':203 'scheme':151 'sentiment':71 'sentiment-analysis' 'settl':103 'spars':176 'spec':200 'specif':111,214 'subscript':155 'summar':74 'technic':194 'text':73 'text-summarization' 'token':83 'treat':242 'unclear':212 'unit':134 'usag':207 'usdc':105,136 'usdc-settlement' 'util':18,37,89 'valid':91,124 'via':9,28,147 'wallet':189 'web3':78 'x402':10,29,43,125,149 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f36c3306-d2dc-41a1-b6a7-b2f283d12e14","listingId":"ea76e459-434a-46cc-824c-531a48169aad","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/payments/252","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:00.848Z"}],"sources":[{"listingId":"ea76e459-434a-46cc-824c-531a48169aad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/252","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:00.848Z","lastSeenAt":"2026-04-23T04:01:30.993Z"}],"details":{"listingId":"ea76e459-434a-46cc-824c-531a48169aad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/252 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/252"},{"claim":"Payment settles on the Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-request data analytics into agent workflows"],"bestFor":["AI agents that need on-demand access to diverse API endpoints without subscription overhead","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing may add up versus flat-rate plans","Users who need detailed API documentation, request schemas, or SLA guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.237Z"},"updatedAt":"2026-04-23T04:01:30.993Z"}}