{"id":"f811e951-292f-4489-a40d-d50a1cdf0276","shortId":"anaUvg","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates a broad set of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/inbox/164` is listed as \"Premium API Access\" and accepts POST requests, charging up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). Payment is settled on-chain to the specified wallet address, with no API keys, rate limits, or subscriptions required.\n\nThe provider's landing page 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 share the same $0.02/request pricing. However, the specific functionality behind the `/api/v1/inbox/164` path is not documented — the description simply says \"Premium API Access\" without detailing what data or service it returns.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. The payment scheme is \"exact\" on the Base network using the canonical USDC contract (0x8335…). No OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawl. The `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["The specific functionality of /api/v1/inbox/164 is unknown — 'Premium API Access' is not descriptive","No OpenAPI spec, request schema, or response schema available","No documentation pages rendered useful content (all showed only 'Connect wallet')","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/164","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/inbox/164","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 challenge, but the specific functionality of /api/v1/inbox/164 is completely undocumented. No OpenAPI schema, no request/response examples, and no description beyond the generic 'Premium API Access' label. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/api/v1/inbox/164':68,175 '/pricing':244 '/readme':246 '/request':17,36,167 '0.02':16,35,89,166 '000':83 '0x8335':227 '1':209 '20':82 '402':206 '6':95 'Base network API' 'USDC API' 'accept':76 'access':74,186 'addit':257 'address':107 'advertis':122 'ai':10,29,134 'analysi':138 'analyt':128 'api':4,23,45,73,110,126,185 'base':7,26,62,84,220 'base-network' 'behind':54,173 'broad':50 'call':91 'canon':224 'categori':124 'chain':102 'challeng':204 'charg':79 'classif':141 'connect':252 'content':258 'contract':226 'convers':158 'crawl':241 'data':9,28,127,131,190 'decim':96 'descript':181 'detail':188,231 'document':179,233 'embed':142 'endpoint':14,33,53,66,162,196 'estim':152 'exact':217 'exampl':236 'exchang':147 'export':132 'feed':146 'financ':11,30,143 'found':238 'four':123 'function':172 'gas':151 'gate':3,22,48 'generat':159 'geocod':156 'howev':169 'http':205 'i.e':88 'infrastructur':154 'insight':133 'key':111 'land':120 'learn':136 'limit':113 'list':70,161 'live':198 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':135 'marketplac':46 'metric':129 'micropay':59 'micropayment API' 'network':63,221 'no-api-key' 'offer':8,27 'on-chain':100 'openapi':229 'page':121,247 'path':176 'pay-per-request API' 'payment':97,214 'per':56,90 'per-request':55 'per-request-billing' 'platform':5,24 'post':77 'post-endpoint' 'premium':72,184 'price':145,168 'prompt':254 'protocol':44,212 'provid':118 'quot':150 'rate':112,148 'report':130 'request':57,78 'request/response':232 'requir':116 'return':194,200,249 'say':183 'schema':230 'scheme':215 'sentiment':137 'servic':192 'set':51 'settl':99 'share':163 'simpli':182 'sinc':92 'specif':65,171 'specifi':105 'subscript':115 'summar':140 'text':139 'token':149 'unit':85 'usag':235 'usdc':19,38,58,87,93,225 'usdc-micropayment' 'use':94,222 'util':13,32,155 'valid':157,202 'version':208 'via':18,37 'wallet':106,253 'web3':144 'without':187 'x402':2,21,43,203 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"41f697cf-360b-4915-ac3a-d37176a495f7","listingId":"f811e951-292f-4489-a40d-d50a1cdf0276","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/inbox/164","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.706Z"}],"sources":[{"listingId":"f811e951-292f-4489-a40d-d50a1cdf0276","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/164","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.706Z","lastSeenAt":"2026-04-22T04:02:46.133Z"}],"details":{"listingId":"f811e951-292f-4489-a40d-d50a1cdf0276","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/164 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/164"},{"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 USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/164"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without subscriptions or API keys","Integrating on-chain USDC micropayments into automated agent workflows","Accessing data, AI, finance, or utility endpoints via x402 protocol"],"bestFor":["Agents or developers wanting zero-commitment, pay-as-you-go API access","x402-compatible clients that can sign USDC payments on Base","Use cases where $0.02/request pricing is cost-effective"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume batch workloads where per-request micropayments add overhead","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.986Z"},"updatedAt":"2026-04-22T04:02:46.133Z"}}