{"id":"0fa9b250-e966-41d5-bb4d-d9ac7b913861","shortId":"R7fHFL","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 variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/inbox/56` 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 a specified wallet address, with no API keys, rate limits, or upfront commitments required.\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 share the same $0.02/request pricing. However, the specific endpoint probed here (`/api/v1/inbox/56`) does not clearly map to any of those named categories — it may be a generic or custom inbox endpoint.\n\nNo OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling. The `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no substantive content. As a result, the exact input format and response structure for this endpoint are unknown. The x402 challenge confirms the endpoint is live and accepting payment-gated POST requests, but callers will need to experiment or contact the provider to determine the expected request body and response format.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-request API","USDC API","Base network API","premium API access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The endpoint path /api/v1/inbox/56 does not correspond to any named API on the provider's homepage — its purpose is unclear","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No example request or response payloads are available; callers must discover the interface experimentally"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/56","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge confirms the endpoint is live with clear pricing ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no example requests or responses, and the purpose of the specific /api/v1/inbox/56 endpoint is unclear. The crawled pages beyond the homepage returned only wallet-connect prompts with no useful 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'/api/v1/inbox/56':67,173 '/pricing':208 '/readme':210 '/request':17,36,165 '0.02':16,35,88,164 '000':82 '20':81 '6':94 'Base network API' 'USDC API' 'accept':75,247 'access':73 'address':106 'advertis':120 'ai':10,29,132 'analysi':136 'analyt':126 'api':4,23,45,72,109,124 'base':7,26,61,83 'base-network' 'behind':53 'bodi':268 'broader':118 'call':90 'caller':254 'categori':122,183 'chain':101 'challeng':240 'charg':78 'classif':139 'clear':176 'commit':115 'confirm':241 'connect':216 'contact':260 'content':222 'convers':156 'crawl':205 'custom':190 'data':9,28,125,129 'decim':95 'detail':196 'determin':264 'document':197 'embed':140 'endpoint':14,33,52,65,160,170,192,235,243 'estim':150 'exact':227 'exampl':199 'exchang':145 'expect':266 'experi':258 'export':130 'feed':144 'financ':11,30,141 'format':229,271 'found':203 'four':121 'gas':149 'gate':3,22,48,250 'generat':157 'generic':188 'geocod':154 'howev':167 'i.e':87 'inbox':191 'infrastructur':152 'input':228 'insight':131 'key':110 'learn':134 'limit':112 'list':69,159 'live':245 'low payment fee' 'lowpaymentfee.com':39 'machin':133 'map':177 'marketplac':46 'may':185 'metric':127 'micropay':58 'micropayment API' 'name':182 'need':256 'network':62 'no-api-key' 'offer':8,27 'on-chain':99 'openapi':194 'page':211 'pay-per-request API' 'payload':201 'payment':96,249 'payment-g':248 'per':55,89 'per-request':54 'per-request-billing' 'platform':5,24,119 'post':76,251 'post-endpoint' 'premium':71 'premium API access' 'price':143,166 'probe':171 'prompt':218 'protocol':44 'provid':262 'quot':148 'rate':111,146 'report':128 'request':56,77,252,267 'request/response':200 'requir':116 'respons':231,270 'result':225 'return':213 'schema':195 'sentiment':135 'settl':98 'share':161 'sinc':91 'specif':64,169 'specifi':104 'structur':232 'substant':221 'summar':138 'text':137 'token':147 'unit':84 'unknown':237 'upfront':114 'usdc':19,38,57,86,92 'usdc-micropayment' 'use':93 'util':13,32,153 'valid':155 'varieti':50 'via':18,37 'wallet':105,217 'web3':142 'x402':2,21,43,239 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"e5e21cb6-08ff-40a2-bf87-9f1335b0dbf4","listingId":"0fa9b250-e966-41d5-bb4d-d9ac7b913861","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.486Z"}],"sources":[{"listingId":"0fa9b250-e966-41d5-bb4d-d9ac7b913861","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.486Z","lastSeenAt":"2026-04-22T04:02:45.904Z"}],"details":{"listingId":"0fa9b250-e966-41d5-bb4d-d9ac7b913861","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/56 \\\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 endpoint returns a 402 x402 challenge requesting up to 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/56"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/56"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for API access without needing API keys or subscriptions","Integrating x402-compatible agents with on-chain USDC micropayments on Base","Accessing data, AI, finance, or utility endpoints with no rate limits"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that support x402 payment protocol on Base","Users who prefer on-chain USDC settlement over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.285Z"},"updatedAt":"2026-04-22T04:02:45.904Z"}}