{"id":"f5bd7abd-e6f2-4b6e-b698-8153081220f6","shortId":"VWnbtg","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 marketplace that gates a variety of endpoints behind per-request USDC micropayments on the Base network. The 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 endpoints are listed at $0.02 per request.\n\nThe specific endpoint at `/api/v1/inbox/86` is labeled \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…on Base, 6 decimals), which equals $0.02. Payment is settled on-chain via the x402 \"exact\" scheme to a specified wallet address. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation is minimal — the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The purpose and behavior of the `/api/v1/inbox/86` endpoint specifically is unclear; it may be a generic inbox or messaging endpoint, but this is not documented. Prospective users should be aware that the platform's actual functionality behind the paywall is unverified.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["micropayment API","pay-per-call API","x402 API","USDC API","Base network API","low fee API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/inbox/86 ('Premium API Access') has no description of what it does or what inputs it expects","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","Actual functionality behind the paywall is unverified — no sample responses are available","The platform lists many endpoint categories but none have been independently verified to return useful data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/86","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/86","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 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/inbox/86 is undocumented. The /api, /pricing, and /README pages are empty behind a wallet gate. This is effectively a stub 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'/api/v1/inbox/86':111,213 '/pricing':179 '/readme':181 '/request':17,34 '0.02':16,33,104,140 '000':128 '0x8335':133 '20':127 '6':136 'Base network API' 'USDC API' 'access':116,165 'actual':241 'address':156 'advertis':61,164 'ai':10,27,73 'ai-inference' 'analysi':77 'analyt':67 'api':4,21,41,65,115,158 'awar':236 'base':7,24,57,129,135 'base-network' 'behavior':210 'behind':49,243 'categori':63 'chain':146 'challeng':122 'classif':80 'connect':187 'content':193 'convers':97 'crypto-paid API' 'data':9,26,66,70 'data-analytics' 'decim':137 'document':174,202,231 'embed':81 'embeddings' 'endpoint':14,31,48,100,109,214,226 'equal':139 'estim':91 'exact':150 'exampl':206 'exchang':86 'export':71 'feed':85 'financ':11,28,82 'finance-data' 'four':62 'function':242 'gas':90 'gate':3,20,44 'generat':98 'generic':222 'geocod':95 'geocoding' 'grant':167 'header':173 'inbox':223 'infrastructur':93 'insight':72 'key':159 'label':113 'learn':75 'limit':162 'list':102 'low fee API' 'lowpaymentfee.com':35 'machin':74 'marketplac':42 'maxamountrequir':125 'may':219 'messag':225 'metric':68 'micropay':54 'micropayment API' 'minim':176 'network':58 'no-api-key' 'offer':8,25 'on-chain':144 'openapi':197 'page':182 'pay-per-call API' 'payment':141,172 'paywal':245 'per':51,105 'per-request':50 'per-request-billing' 'platform':5,22,60,239 'premium':114 'price':84 'prompt':189 'prospect':232 'protocol':40 'pure':168 'purpos':208 'quot':89 'rate':87,161 'report':69 'request':52,106 'request/response':200 'resolv':184 'return':118 'schema':201 'scheme':151 'sentiment':76 'sentiment-analysis' 'settl':143 'spec':198 'specif':108,215 'specifi':154 'summar':79 'text':78 'text-summarization' 'token':88 'unclear':217 'unit':130 'unverifi':247 'usag':205 'usdc':53,132 'usdc-micropayment' 'user':233 'util':13,30,94 'utility-apis' 'valid':96,120 'varieti':46 'via':147 'wallet':155,188 'web3':83 'x402':2,19,39,121,149,171 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"778aa650-3760-472c-adce-24b72fed8d3a","listingId":"f5bd7abd-e6f2-4b6e-b698-8153081220f6","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/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.210Z"}],"sources":[{"listingId":"f5bd7abd-e6f2-4b6e-b698-8153081220f6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.210Z","lastSeenAt":"2026-04-22T04:02:45.626Z"}],"details":{"listingId":"f5bd7abd-e6f2-4b6e-b698-8153081220f6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/86 \\\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 platform lists APIs 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 no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/86"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/86"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Programmatic access to financial price feeds and exchange rates paid per request","Geocoding or data conversion utilities consumed by autonomous workflows","Data export and analytics queries billed at micro-transaction granularity"],"bestFor":["AI agents or bots that can settle USDC payments on Base automatically","Developers wanting zero-commitment, pay-as-you-go API access","Use cases requiring very low per-call costs ($0.02) with no subscription"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-throughput applications where per-request on-chain settlement adds unacceptable latency","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.628Z"},"updatedAt":"2026-04-22T04:02:45.626Z"}}