{"id":"9cc7c50a-57e6-40cf-9eca-d54100c3d867","shortId":"wbkL27","kind":"x402","title":"x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.","tagline":"x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.","description":"lowpaymentfee.com hosts a suite of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/crypto market data, and general utilities. Every endpoint is gated by an x402 payment challenge: callers attach a USDC payment on the Base network in the X-PAYMENT header and receive the response immediately — no API keys, no accounts, no rate limits.\n\nThe specific endpoint at `/api/v1/collections/32` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (token contract 0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per request, consistent with the site-wide $0.02/request pricing shown on the landing page. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe provider's landing page lists roughly 16 endpoints across four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt, so detailed request/response schemas, parameter descriptions, and example payloads are unavailable. The exact functionality behind the `/api/v1/collections/32` path is unclear — it may be a bundled collection endpoint or an alias, but no further documentation exists to confirm.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","no-api-key"],"categories":["api-gateway","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","premium API access"],"warnings":["No documentation available — all doc/pricing/API pages return only 'Connect wallet' with no content.","The exact purpose and expected input/output of /api/v1/collections/32 is unknown; 'Premium API Access' is the only description.","No OpenAPI spec, no request schema, no response schema provided by the provider.","Cannot verify what data or service is actually returned behind the paywall."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/32","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/collections/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages return only a 'Connect wallet' stub. The purpose of the specific /collections/32 endpoint is undocumented. Effectively a stub 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'/request':145 '0.02':9,25,135,144 '000':117 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':160 '0x8335':124 '16':173 '20':116 '2913':125 '300':163 '6':131 'Base network API' 'USDC API' 'accept':106 'access':104 'account':90 'across':175 'address':159 'advertis':112 'ai':184 'ai-inference' 'ai/ml':49 'alia':250 'analysi':188 'analyt':48,179 'api':4,20,45,87,103 'attach':67 'base':7,23,73,118,127 'behind':235 'beyond':211 'bundl':245 'call':44 'caller':66 'categori':177 'chain':157 'challeng':65,111 'classif':191 'classification' 'collect':5,21,246 'confirm':257 'connect':218 'consist':138 'contract':123 'convers':207 'crypto-quotes' 'data':47,53,178 'data-analytics' 'decim':132 'descript':226 'detail':222 'document':209,254 'embed':192 'embeddings' 'endpoint':58,96,174,247 'equal':134 'estim':202 'everi':57 'exact':233 'exampl':228 'exchang':197 'exist':255 'export':182 'feed':196 'financ':193 'finance-data' 'finance/crypto':51 'four':176 'function':234 'gas':201 'gate':3,19,60 'general':55 'generat':208 'geocod':205 'geocoding' 'header':80 'host':34 'immedi':85 'infer':50 'infrastructur':204 'insight':183 'key':15,31,88 'land':150,169,213 'learn':186 'limit':93 'list':100,171 'low payment fee' 'lowpaymentfee.com':33 'machin':185 'market':52 'maxamountrequir':114 'may':242 'metric':180 'micropayment API' 'network':74 'no-api-key' 'on-chain':155 'page':151,170,210,214 'paramet':225 'path':238 'pay':8,24,42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payload':229 'payment':64,70,79,152 'per':10,26,43,136 'post':107 'premium':102 'premium API access' 'price':146,195 'prompt':220 'protocol':40 'provid':167 'quot':200 'rate':92,198 'receiv':82 'report':181 'request':11,27,108,137 'request/response':223 'requir':16,32 'respons':84 'return':215 'rough':172 'schema':224 'second':164 'sentiment':187 'sentiment-analysis' 'settl':154 'shown':147 'sinc':128 'site':142 'site-wid':141 'span':46 'specif':95 'suit':36 'summar':190 'text':189 'text-summarization' 'timeout':165 'token':122,199 'unavail':231 'unclear':240 'unit':119 'usdc':13,29,69,121,129 'usdc-base' 'use':130 'util':56 'valid':206 'wallet':219 'web3':194 'wide':143 'x':78 'x-payment':77 'x402':2,18,39,63,110 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"acc3a0be-99b9-4fa0-bed0-b819801a062f","listingId":"9cc7c50a-57e6-40cf-9eca-d54100c3d867","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/collections/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T00:59:34.638Z"}],"sources":[{"listingId":"9cc7c50a-57e6-40cf-9eca-d54100c3d867","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T00:59:34.638Z","lastSeenAt":"2026-04-22T04:02:20.782Z"}],"details":{"listingId":"9cc7c50a-57e6-40cf-9eca-d54100c3d867","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/32 \\\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 site lists ~16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $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 with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/collections/32"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call USDC micropayments","Geocoding or data validation as a utility service paid per request on Base"],"bestFor":["AI agents with Base USDC wallets needing keyless, pay-as-you-go API access","Developers prototyping against multiple API categories without signup or rate limits","Web3-native applications that prefer on-chain settlement over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.858Z"},"updatedAt":"2026-04-22T04:02:20.782Z"}}