{"id":"24b63272-61b8-414f-9048-e64f4ac0d4ab","shortId":"f9P3Q8","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 access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint probed (/api/v1/orders/89) is labeled \"Premium API Access\" and requires a POST with an x402 payment header. The 402 challenge indicates a max cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is settled on-chain to the specified wallet address with a 300-second timeout.\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 endpoints are listed at the same $0.02/request price point. The platform emphasizes no API keys, no rate limits, no minimums, and instant access — authentication and billing are handled entirely through the x402 payment protocol.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The specific functionality behind /api/v1/orders/89 is unclear beyond its \"Premium API Access\" label. Without documentation or example payloads, it is difficult to determine what data this endpoint returns or what input it expects.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","data","llm","finance","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","crypto-gated API","402 payment endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all return only 'Connect wallet' with no content","No OpenAPI or schema definition provided for any endpoint","The specific purpose and expected input/output of /api/v1/orders/89 ('Premium API Access') is undocumented","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/89","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/orders/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of /api/v1/orders/89 specifically is unclear. This is effectively a stub 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'/api/v1/orders/89':65,241 '/docs':205 '/pricing':207 '/readme':209 '/request':17,34,172 '0.02':16,33,100,171 '000':89 '0x8335':94 '20':88 '2913':95 '300':120 '402':81 '402 payment endpoint' '6':105 'Base USDC API' 'access':45,70,188,248 'address':117 'advertis':126 'ai':10,27,138 'analysi':142 'analyt':132 'api':4,21,41,69,130,179,247 'authent':189 'base':7,24,59,90,97 'base-network' 'behind':51,240 'beyond':244 'bill':191 'broader':124 'categori':128 'chain':112 'challeng':82 'classif':145 'connect':215 'content':221 'convers':162 'cost':86 'crypto-gated API' 'data':9,26,131,135,261 'decim':106 'detail':232 'determin':259 'difficult':257 'document':200,233,251 'embed':146 'emphas':177 'endpoint':14,31,50,63,165,236,263 'entir':194 'equal':99 'estim':156 'exampl':229,253 'exchang':151 'expect':269 'export':136 'extrem':202 'feed':150 'financ':11,28,147 'four':127 'function':239 'gas':155 'gate':3,20,44 'generat':163 'geocod':160 'handl':193 'header':79 'indic':83 'infrastructur':158 'input':267 'insight':137 'instant':187 'json-response' 'key':180 'label':67,249 'learn':140 'limit':183 'list':167 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':139 'marketplac':42 'max':85 'metric':133 'micropay':56 'micropayment API' 'minimum':185 'network':60 'no-api-key' 'offer':8,25 'on-chain':110 'openapi':225 'page':210 'pay-per-request API' 'payload':254 'payment':78,107,198 'per':53,101 'per-request':52 'per-request-billing' 'platform':5,22,125,176 'point':174 'post':74 'post-endpoint' 'premium':68,246 'price':149,173 'probe':64 'prompt':217 'protocol':40,199 'quot':154 'rate':152,182 'report':134 'request':54,102 'request/response':228 'requir':72 'return':212,264 'schema':226 'second':121 'sentiment':141 'settl':109 'spars':203 'specif':62,238 'specifi':115 'substant':220 'summar':144 'text':143 'timeout':122 'token':153 'unclear':243 'unit':91 'usdc':55,93,103 'usdc-micropayment' 'use':104 'util':13,30,159 'valid':161 'varieti':48 'wallet':116,216 'web3':148 'without':250 'x402':2,19,39,77,197 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"4006322f-9a09-4932-b7f1-2cc02d3424e4","listingId":"24b63272-61b8-414f-9048-e64f4ac0d4ab","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/orders/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:43.967Z"}],"sources":[{"listingId":"24b63272-61b8-414f-9048-e64f4ac0d4ab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:43.967Z","lastSeenAt":"2026-04-23T12:05:08.271Z"}],"details":{"listingId":"24b63272-61b8-414f-9048-e64f4ac0d4ab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/89 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/89"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or analytics via per-request crypto micropayments","Integrating AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching financial data (prices, exchange rates, gas estimates) with on-chain settlement","Using utility services (geocoding, validation, conversion) paid per call"],"bestFor":["Developers wanting keyless, pay-per-use API access settled on Base","AI agents that can autonomously pay for API calls via x402","Projects needing low-friction access to diverse API categories without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput with predictable flat-rate pricing","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.148Z"},"updatedAt":"2026-04-23T12:05:08.271Z"}}