{"id":"5993a999-9f31-465c-b374-ff6ee2c92abe","shortId":"ctcHCB","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API platform that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/orders/18` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (i.e., $0.02) per call via the x402 exact payment scheme. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader platform advertises four categories of APIs: 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 listed endpoints are priced at $0.02 per request.\n\nThe probed endpoint (`/api/v1/orders/18`) returned a valid 402 challenge confirming it is live. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), and there is no OpenAPI schema, no request/response examples, and no detailed description of what the `/orders/18` endpoint actually returns. The lack of documentation makes it difficult to determine the exact functionality of this specific endpoint versus the other listed APIs.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-gateway","llm","finance","geo"],"synonyms":["x402 api","micropayment api","pay-per-request api","base network api","usdc api","low fee api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — all doc pages return only 'Connect wallet'","The specific functionality of /api/v1/orders/18 is undocumented; it is unclear what data it returns","No request body schema or response examples are available for any endpoint","The platform lists many endpoint categories but none have been individually verified beyond this one"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/18","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/orders/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and the landing page provides a clear overview of available APIs and pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The specific purpose of `/api/v1/orders/18` is unclear beyond the generic label 'Premium API 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'/orders/18':214 '/request':17,34 '0.02':16,33,86,165 '000':80 '20':79 '402':175 '402 payment api' 'access':44,71 'actual':216 'advertis':121 'ai':10,27,133 'ai-inference' 'analysi':137 'analyt':127 'api':4,21,40,70,96,125,238 'attach':107 'base':7,24,60,81 'base network api' 'behind':50 'beyond':183 'broader':119 'call':88 'caller':105 'categori':123 'challeng':176 'classif':140 'classification' 'commit':102 'confirm':177 'connect':196 'convers':157 'data':9,26,126,130 'data-analytics' 'descript':210 'detail':209 'determin':226 'difficult':224 'document':182,221 'embed':141 'embeddings' 'empti':189 'endpoint':14,31,49,64,161,170,215,233 'essenti':188 'estim':151 'exact':92,228 'exampl':206 'exchang':146 'export':131 'feed':145 'financ':11,28,142 'finance-data' 'four':122 'function':229 'gas':150 'gate':3,20,43 'generat':158 'geocod':155 'geocoding' 'header':112 'howev':181 'i.e':85 'infrastructur':153 'insight':132 'key':97 'label':68 'lack':219 'land':185 'learn':135 'limit':99 'list':160,237 'live':180 'low fee api' 'lowpaymentfee.com':35 'machin':134 'make':222 'metric':128 'micropay':54 'micropayment api' 'network':61 'offer':8,25 'openapi':202 'page':186,193 'pay-per-request api' 'payment':75,93,111,116 'per':52,87,166 'per-request':51 'per-request-micropayment' 'platform':5,22,41,120 'premium':69 'price':144,163 'probe':169 'proof':117 'protocol':39 'quot':149 'rate':98,147 'report':129 'request':53,167 'request/response':205 'requir':73,104 'return':172,217 'schema':203 'scheme':94 'sentiment':136 'sentiment-analysis' 'settl':55 'show':195 'simpli':106 'specif':63,232 'sub':192 'sub-pag':191 'summar':139 'text':138 'text-summarization' 'token':148 'unit':82 'upfront':101 'usdc':57,84 'usdc api' 'usdc-base' 'util':13,30,154 'utility-apis' 'valid':115,156,174 'varieti':47 'versus':234 'via':89 'wallet':197 'web3':143 'x':110 'x-payment':109 'x402':2,19,38,91 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"36908cc2-58f1-4d58-8de9-fa818a94f696","listingId":"5993a999-9f31-465c-b374-ff6ee2c92abe","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/orders/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:12.480Z"}],"sources":[{"listingId":"5993a999-9f31-465c-b374-ff6ee2c92abe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:12.480Z","lastSeenAt":"2026-04-23T19:00:40.485Z"}],"details":{"listingId":"5993a999-9f31-465c-b374-ff6ee2c92abe","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with a valid USDC payment proof on Base.\n# Using curl as a conceptual example (actual payment proof generation requires an x402 client):\ncurl -X POST https://lowpaymentfee.com/api/v1/orders/18 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/18"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/orders/18"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a pay-per-call basis","Running data analytics queries and exporting reports with no subscription commitment","Geocoding and data validation as utility microservices"],"bestFor":["Agents or developers who want zero-signup, pay-per-use API access","Use cases requiring low-cost micropayments ($0.02/call) settled on Base L2","Projects already holding USDC on Base that need quick API access without accounts"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Users without USDC on Base or unfamiliar with x402 payment protocol"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.542Z"},"updatedAt":"2026-04-23T19:00:40.485Z"}}