{"id":"b3c3c1b0-f331-4fb7-a045-6f096c02d405","shortId":"VVvYVz","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 `/api/v1/trades/49` is listed as \"Premium API Access\" and appears to be part of a broader suite that includes data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation).\n\nThe platform advertises a flat $0.02 per request across its endpoints. The x402 challenge for this particular endpoint shows a `maxAmountRequired` of 20000 base units of USDC (contract `0x8335...2913` on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no commitments required — callers simply attach an X-PAYMENT header to each request.\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 description of what the `/api/v1/trades/49` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what input parameters it expects or what data it provides.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","post-method","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["premium API access","trades endpoint","x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only a 'Connect wallet' prompt with no content.","No OpenAPI or request/response schema provided; it is unknown what parameters the endpoint accepts or what data it returns.","The specific purpose of /api/v1/trades/49 ('Premium API Access') is not explained anywhere in the crawled material.","The endpoint is not listed on the provider's own homepage among the advertised APIs, raising questions about its status."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/49","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/49","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 documentation, no request/response examples, and no explanation of what the /api/v1/trades/49 endpoint actually returns. The docs pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34 '0.02':16,33,118,149 '0x8335':141 '20000':135 '2913':142 '402':228 '6':145 'Base USDC API' 'access':45,72 'across':121 'actual':219 'advertis':115 'ai':10,27 'ai/ml':86 'analysi':89 'analyt':85 'api':4,21,41,71,160,186 'appear':74 'attach':171 'base':7,24,61,136,144 'behind':51 'broader':80 'caller':169 'challeng':126,229 'classif':91 'commit':167 'connect':195 'content':201 'contract':140 'convers':111 'crypto':95 'data':9,26,84,97,243 'decim':146 'descript':213 'detail':212 'doc':185 'document':180,232 'embed':92 'endpoint':14,31,50,65,123,130,218,222 'equal':148 'estim':105 'exact':156 'exampl':209 'exchang':100 'expect':240 'extrem':182 'feed':99 'financ':11,28,93 'flat':117 'gas':104 'gate':3,20,44 'generat':112 'geocod':109 'header':176 'includ':83 'infer':87 'infrastructur':107 'input':237 'json-api' 'key':161 'limit':164 'list':68 'live':224 'lowpaymentfee' 'lowpaymentfee.com':35 'made':152 'market':96 'marketplac':42 'maxamountrequir':133 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':205 'page':190 'paramet':238 'part':77 'particular':129 'pay-per-request API' 'payment':150,175 'per':53,119 'per-request':52 'per-request-micropayment' 'platform':5,22,114 'post-method' 'premium':70 'premium API access' 'price':98,187 'prompt':197 'proper':227 'protocol':40 'provid':245 'quot':103 'rate':101,163 'readm':189 'request':54,120,179 'request/response':208 'requir':168 'return':192,220,225 'schema':206 'scheme':157 'sentiment':88 'settl':56 'show':131 'simpli':170 'spars':183 'specif':64 'substant':200 'suit':81 'summar':90 'token':102 'trades endpoint' 'unclear':235 'unit':137 'usdc':58,139 'usdc-base' 'util':13,30,108 'valid':110 'varieti':48 'via':153 'wallet':196 'without':231 'x':174 'x-payment':173 'x402':2,19,39,125,155 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"fe552303-406d-4e3e-ba8b-4e83cd36a0a7","listingId":"b3c3c1b0-f331-4fb7-a045-6f096c02d405","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:56.882Z"}],"sources":[{"listingId":"b3c3c1b0-f331-4fb7-a045-6f096c02d405","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:56.882Z","lastSeenAt":"2026-04-26T03:03:00.114Z"}],"details":{"listingId":"b3c3c1b0-f331-4fb7-a045-6f096c02d405","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/49 \\\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 platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/trades/49"},{"claim":"The endpoint description is 'Premium API Access' and accepts POST requests.","source_url":"https://lowpaymentfee.com/api/v1/trades/49"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or premium financial information via a single micropayment","Integrating pay-per-call API access into autonomous agents without API key management","Programmatic access to trade-related data settled on Base L2"],"bestFor":["Agents or developers wanting keyless, pay-per-request API access","Users who prefer crypto micropayments over subscription billing","Scenarios requiring low-friction, no-commitment API calls"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.348Z"},"updatedAt":"2026-04-26T03:03:00.114Z"}}