{"id":"bf5fa668-d188-4c00-9027-c3567eebfc0b","shortId":"ThFpQS","kind":"x402","title":"x402-gated trade data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated trade data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/trades/10` is part of lowpaymentfee.com, a platform offering a variety of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific endpoint probed here is labeled \"Premium API Access\" and appears to serve trade-related data (inferred from the `/trades/10` path). Payment is settled on the Base network using USDC (contract `0x8335…2913`) via the x402 exact-payment scheme.\n\nThe x402 challenge confirms the endpoint is live, returning a 402 with `maxAmountRequired` of 20000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/trades/10` endpoint actually returns. The `10` in the path likely represents a resource ID (e.g., a specific trade or trade pair), but this is unconfirmed. Without documentation, callers must experiment to discover the expected POST body and response format.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","trade-data","post-endpoint"],"categories":["finance","data"],"synonyms":["trade API","x402 API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","crypto trade data"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format","The specific function of /api/v1/trades/10 is unclear; 'Premium API Access' is a generic label used across the platform","Cannot verify what data is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/10","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/10","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 the x402 challenge is well-formed with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the /trades/10 endpoint is only vaguely inferable from its path. All non-landing pages returned only a wallet-connect 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'/request':141 '/trades/10':82,207 '0.02':10,24,128,140 '0x8335':94 '10':212 '20000':117 '2913':95 '402':113 '6':123 'Base network API' 'USDC micropayment API' 'access':70,156 'across':142 'actual':209 'advertis':136,147 'ai/ml':54 'analyt':53 'api':50,69,149,177 'appear':72 'attach':159 'base':8,22,89,118 'base-network' 'bodi':242 'caller':157,234 'challeng':105 'confirm':106 'connect':186 'consist':131 'content':192 'contract':93 'crypto trade data' 'data':5,19,52,57,78 'decim':124 'descript':203 'discov':238 'doc':176 'document':171,233 'e.g':221 'endpoint':6,20,30,63,108,144,208 'exact':100 'exact-pay':99 'exampl':200 'expect':240 'experi':236 'extrem':173 'finance/web3':56 'flat':137 'format':245 'gate':3,17 'header':164 'id':220 'infer':55,79 'infrastructur':59 'instant':155 'key':150 'label':67 'like':216 'limit':153 'live':110 'lowpaymentfee' 'lowpaymentfee.com':36 'maxamountrequir':115 'must':235 'network':90 'offer':39 'openapi':196 'page':181 'pair':227 'part':34 'path':83,215 'pay':9,23,47 'pay-per-call API' 'pay-per-request':46 'payment':84,101,163,169 'per':11,25,48,129 'platform':38,146 'post':241 'post-endpoint' 'premium':68 'price':138,178 'probe':64 'prompt':188 'proof':170 'protocol':45 'rate':152 'readm':180 'relat':77 'render':183 'repres':217 'request':12,26,49,130 'request/response':199 'resourc':219 'respons':244 'return':111,210 'schema':197 'scheme':102 'serv':74 'settl':86 'simpli':158 'sinc':120 'site':134 'span':51 'spars':174 'specif':62,223 'substant':191 'trade':4,18,76,224,226 'trade API' 'trade-data' 'trade-rel':75 'translat':126 'unconfirm':231 'unit':119 'usdc':14,28,92,121 'usdc-settlement' 'use':91,122 'util':60 'valid':167 'varieti':41 'via':96 'wallet':187 'without':232 'x':162 'x-payment':161 'x402':2,16,44,98,104,168 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':43","prices":[{"id":"a5b47e2f-5f4b-4285-ae81-ee613cdb52a4","listingId":"bf5fa668-d188-4c00-9027-c3567eebfc0b","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:32.171Z"}],"sources":[{"listingId":"bf5fa668-d188-4c00-9027-c3567eebfc0b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:32.171Z","lastSeenAt":"2026-04-26T08:32:38.564Z"}],"details":{"listingId":"bf5fa668-d188-4c00-9027-c3567eebfc0b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/10 \\\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 USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/10"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/10"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade or market data on a per-request payment basis without API keys","Agent-driven workflows that need low-friction, wallet-authenticated data access","Programmatic access to trade information settled via USDC on Base"],"bestFor":["Developers or agents with Base USDC wallets wanting frictionless API access","Low-volume or sporadic callers who prefer pay-per-use over subscriptions","x402-compatible agent toolchains that auto-negotiate payment"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.52Z"},"updatedAt":"2026-04-26T08:32:38.564Z"}}