{"id":"b17da180-d095-4ebd-bae4-2c367e4558f0","shortId":"hUEGym","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 collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/inbox/159` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain using USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises four categories of endpoints: 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 being listed here (`/api/v1/inbox/159`) does not clearly map to any of these named services — its description is simply \"Premium API Access\" with no further documentation on what it returns or what input it expects.\n\nThe endpoint is confirmed live, returning a proper 402 challenge with x402 version 1. Documentation is extremely sparse: the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema beyond the outputSchema stub, and no examples of what the endpoint actually does.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No documentation available for what /api/v1/inbox/159 actually returns or accepts as input","The endpoint path does not match any of the named services listed on the homepage","No OpenAPI spec, no request/response examples, and no README content available","The /api, /pricing, and /README pages all render only a 'Connect wallet' prompt with no useful information"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/159","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/159","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 documentation on what the endpoint actually does, no request/response schema, no OpenAPI spec, and the /api, /pricing, and /README pages are all empty beyond a wallet-connect prompt. The endpoint path '/api/v1/inbox/159' does not match any of the advertised service categories, making its purpose 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'/api/v1/inbox/159':67,186 '/pricing':237 '/readme':239 '/request':17,36,177 '0.02':16,35,102,176 '000':97 '0x8335':87 '1':230 '20':96 '2913':88 '402':225 '6':107 'Base network API' 'USDC API' 'accept':75 'access':73,203 'actual':271 'addit':250 'advertis':132 'ai':10,29,144 'amount':94 'analysi':148 'analyt':138 'api':4,23,45,72,110,202 'attach':121 'base':7,26,61,90,98 'base-network' 'behind':53 'beyond':260 'broader':130 'call':104 'caller':119 'categori':134 'chain':83 'challeng':226 'classif':151 'clear':189 'collect':50 'commit':116 'confirm':220 'connect':245 'content':251 'contract':86 'convers':168 'data':9,28,137,141 'decim':108 'descript':198 'document':207,231 'embed':152 'endpoint':14,33,52,65,136,172,182,218,270 'equal':101 'estim':162 'exampl':266 'exchang':157 'expect':216 'export':142 'extrem':233 'feed':156 'financ':11,30,153 'four':133 'gas':161 'gate':3,22,48 'generat':169 'geocod':166 'header':125 'howev':179 'infrastructur':164 'input':214 'insight':143 'key':111 'learn':146 'limit':113 'list':69,171,184 'live':221 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':145 'map':190 'marketplac':46 'maximum':93 'metric':139 'micropay':58 'micropayment API' 'name':195 'network':62 'no-api-key' 'offer':8,27 'on-chain':81 'openapi':255 'outputschema':262 'page':240 'pay-per-request API' 'payment':78,124 'per':55,103 'per-request':54 'per-request-billing' 'platform':5,24,131 'post':76 'post-endpoint' 'premium':71,201 'price':155,178 'prompt':247 'proper':224 'protocol':44 'quot':160 'rate':112,158 'report':140 'request':56,77,128 'request/response':258 'requir':118 'resolv':242 'return':211,222 'schema':259 'sentiment':147 'servic':196 'settl':80 'share':173 'simpli':120,200 'spars':234 'spec':256 'specif':64,181 'stub':263 'summar':150 'text':149 'token':159 'unit':99 'upfront':115 'usdc':19,38,57,85,105 'usdc-micropayment' 'use':84,106 'util':13,32,165 'valid':167 'version':229 'via':18,37 'wallet':246 'web3':154 'x402':2,21,43,123,228 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"f726ab94-6689-4596-a3c2-8ae0392bf06f","listingId":"b17da180-d095-4ebd-bae4-2c367e4558f0","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/159","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.788Z"}],"sources":[{"listingId":"b17da180-d095-4ebd-bae4-2c367e4558f0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/159","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.788Z","lastSeenAt":"2026-04-22T01:02:16.581Z"}],"details":{"listingId":"b17da180-d095-4ebd-bae4-2c367e4558f0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/159 \\\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 challenge with x402 version 1, maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/159"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/159"},{"claim":"The platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without managing API keys or subscriptions","Integrating on-chain USDC micropayments into automated agent workflows","Accessing data, AI, finance, or utility endpoints via x402 protocol"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-call pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring non-crypto payment methods","High-volume use cases where per-request on-chain settlement adds unacceptable latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.375Z"},"updatedAt":"2026-04-22T01:02:16.581Z"}}