{"id":"0145681f-609f-452b-95e6-edde60d55d02","shortId":"qCWPxv","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 platform that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/trades/121` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 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\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific purpose of the `/api/v1/trades/121` endpoint (what trade data it returns or what input it expects) is not documented anywhere in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["finance","llm","geo","data"],"synonyms":["micropayment API","pay-per-request API","x402 API","USDC API","Base network API","low fee API","trade data API"],"warnings":["No OpenAPI or schema documentation available — all /docs, /api, /pricing, /README pages return only a wallet-connect prompt","The specific purpose and expected input/output of /api/v1/trades/121 is not documented anywhere","The platform lists many endpoint categories but none have publicly visible technical documentation","Cannot verify what data or functionality any of the advertised endpoints actually provide"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/121","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/121","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, confirming it works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The specific function of /api/v1/trades/121 is undocumented. This is effectively a stub 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'/api/v1/trades/121':66,213 '/docs':176 '/pricing':178 '/readme':180 '/request':17,34,164 '0.02':16,33,90,163 '000':84 '20':83 '402':76 'Base network API' 'USDC API' 'access':45,72 'advertis':118 'ai':10,27,130 'ai-inference' 'analysi':134 'analyt':124 'anywher':228 'api':4,21,41,71,94 'attach':103 'avail':207 'base':7,24,61,85 'base-network' 'behind':51 'beyond':168 'broader':116 'call':92 'caller':101 'categori':120 'challeng':77 'classif':137 'connect':186 'convers':154 'crawl':231 'crypto-data' 'data':9,26,123,127,217 'data-analytics' 'detail':193 'document':167,202,227 'embed':138 'endpoint':14,31,50,65,122,157,214 'estim':148 'exampl':205 'exchang':143 'expect':224 'export':128 'extrem':173 'feed':142 'financ':11,28,139 'finance-data' 'four':119 'gas':147 'gate':3,20,44 'generat':155 'geocod':152 'header':108 'i.e':89 'infrastructur':150 'input':222 'insight':129 'key':95 'land':170 'learn':132 'limit':98 'list':68,159 'low fee API' 'lowpaymentfee.com':35 'machin':131 'materi':232 'metric':125 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'offer':8,25 'openapi':197 'page':171,181 'pay-per-request API' 'payload':206 'payment':79,107,113 'per':53,91 'per-request':52 'per-request-billing' 'platform':5,22,42,117 'point':166 'premium':70 'price':141,165 'prompt':188 'proof':114 'protocol':40 'purpos':210 'quot':146 'rate':97,144 'render':183 'report':126 'request':54 'request/response':200 'requir':78,100 'return':74,219 'schema':201 'sentiment':133 'settl':56 'simpli':102 'spars':174 'spec':198 'specif':64,209 'summar':136 'technic':192 'text':135 'token':145 'trade':216 'trade data API' 'unit':86 'usdc':58,88 'usdc-micropayment' 'util':13,30,151 'utility-services' 'valid':111,153 'varieti':48 'wallet':187 'web3':140 'x':106 'x-payment':105 'x402':2,19,39,112 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"d3aafd8a-1e82-49a3-8cc6-1f7f5cf4b8d5","listingId":"0145681f-609f-452b-95e6-edde60d55d02","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/121","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:26.721Z"}],"sources":[{"listingId":"0145681f-609f-452b-95e6-edde60d55d02","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/121","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:26.721Z","lastSeenAt":"2026-04-23T00:32:16.771Z"}],"details":{"listingId":"0145681f-609f-452b-95e6-edde60d55d02","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/121 \\\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/121"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/121"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","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 trade data or analytics via a single micropayment without needing an API key","Integrating pay-per-call AI inference (sentiment, summarization, classification, embeddings) into agent workflows","Fetching real-time crypto quotes, gas estimates, or exchange rates with per-request USDC payments","Using utility endpoints like geocoding or data conversion without subscription commitments"],"bestFor":["AI agents that need frictionless, keyless API access via x402 micropayments","Developers who want pay-as-you-go pricing without subscriptions or rate limits","Applications on the Base network that can settle USDC payments natively"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription tiers","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.821Z"},"updatedAt":"2026-04-23T00:32:16.771Z"}}