{"id":"fc6dc073-04f3-46bf-ae66-8578ae88803c","shortId":"QXZPjT","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 micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/57` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). Payment is handled via the x402 exact scheme — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\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 endpoints are listed at the same $0.02/request price point.\n\nThe specific endpoint probed (`/api/v1/trades/57`) does not clearly map to any of the documented categories on the landing page — it appears under a \"trades\" path with a numeric ID (57), which may represent a specific trade record or a finance-related resource. Documentation beyond the landing page is essentially empty (all subpages just show \"Connect wallet\"), so the exact request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","finance-data","web3-data","geocoding","text-summarization","sentiment-analysis","embeddings","classification"],"categories":["finance","llm","geo","data"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No API documentation available — all doc/pricing/README pages are empty (just show 'Connect wallet')","No OpenAPI or request/response schema provided for any endpoint","The /api/v1/trades/57 endpoint is not listed among the documented endpoints on the landing page — its purpose is unclear","Cannot verify what data this endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/57","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/trades/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific /api/v1/trades/57 path is not explained anywhere on the site. All doc pages return only 'Connect wallet' with no 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'/request':17,34,171 '0.02':16,33,77,91,170 '000':83 '20':82 '57':203 '6':89 'Base network API' 'USDC API' 'access':44,72 'account':103 'advertis':125 'ai':10,27,137 'ai-inference' 'analysi':141 'analyt':131 'api':4,21,40,71,101 'appear':194 'attach':111 'base':7,24,60,84 'behind':50 'beyond':218 'broader':123 'call':79 'caller':109 'categori':127,188 'classif':144 'classification' 'clear':181 'connect':229 'convers':161 'cost':74 'data':9,26,130,134 'data-analytics' 'decim':90 'document':187,217 'embed':145 'embeddings' 'empti':224 'endpoint':14,31,49,64,129,164,176,238 'essenti':223 'estim':155 'exact':98,233 'exchang':150 'export':135 'feed':149 'financ':11,28,146,214 'finance-data' 'finance-rel':213 'four':126 'gas':154 'gate':3,20,43 'generat':162 'geocod':159 'geocoding' 'handl':94 'header':116 'id':202 'infrastructur':157 'insight':136 'key':102 'land':191,220 'learn':139 'limit':106 'list':68,166 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':138 'map':182 'marketplac':41 'maxamountrequir':80 'may':205 'metric':132 'micropay':54 'micropayment API' 'network':61 'numer':201 'offer':8,25 'page':192,221 'path':198 'pay-per-call API' 'payment':92,115,120 'per':52,78 'per-request':51 'per-request-micropayment' 'platform':5,22,124 'point':173 'premium':70 'price':148,172 'probe':177 'proof':121 'protocol':39 'quot':153 'rate':105,151 'record':210 'relat':215 'report':133 'repres':206 'request':53 'request/response':234 'requir':108 'resourc':216 'schema':235 'scheme':99 'sentiment':140 'sentiment-analysis' 'settl':55 'show':228 'simpli':110 'specif':63,175,208 'subpag':226 'summar':143 'text':142 'text-summarization' 'token':152 'trade':197,209 'unit':85 'unknown':240 'usdc':57,87 'usdc-base' 'util':13,30,158 'valid':119,160 'varieti':47 'via':95 'wallet':230 'web3':147 'web3-data' 'x':114 'x-payment':113 'x402':2,19,38,97 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"c609f55c-b7c0-476d-919d-b5325c5c58ca","listingId":"fc6dc073-04f3-46bf-ae66-8578ae88803c","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/trades/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:08.248Z"}],"sources":[{"listingId":"fc6dc073-04f3-46bf-ae66-8578ae88803c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:08.248Z","lastSeenAt":"2026-04-22T23:02:06.604Z"}],"details":{"listingId":"fc6dc073-04f3-46bf-ae66-8578ae88803c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/57 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/57"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/57"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing financial trade data or market information on a per-request basis without API keys","Integrating pay-per-call AI inference (sentiment, summarization, classification, embeddings) into agent workflows","Fetching real-time price feeds, exchange rates, or gas estimates via micropayment-gated endpoints","Using utility services like geocoding or data validation without subscription commitments"],"bestFor":["AI agents that need on-demand API access without pre-registration or API keys","Developers prototyping integrations who want zero-commitment pay-as-you-go pricing","x402-compatible wallets and clients on the Base network"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.839Z"},"updatedAt":"2026-04-22T23:02:06.604Z"}}