{"id":"435dbccf-5de7-4890-b64c-2cdbaec1c83f","shortId":"H2Npcp","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/trades/104` suggests a finance/trading-related data endpoint, though the exact response payload is not documented. The provider operates a broader platform offering Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utility APIs, all priced uniformly at $0.02 per request.\n\nPayment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge confirms the endpoint is live and accepts POST requests with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no example request/response bodies, and no description of what data the `/trades/104` endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know what to expect from a successful call.","tags":[],"capabilities":["x402-payment","per-call-pricing","base-network","usdc-settlement","no-api-key","post-method"],"categories":["finance","data"],"synonyms":["trade data API","pay-per-call API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No documentation available — all doc/pricing/README pages show only 'Connect wallet'","No OpenAPI or output schema describing the response format","The specific meaning of '/trades/104' is unknown — could be a static resource ID or a placeholder","Cannot verify what data is actually returned on successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/104","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/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is virtually no documentation on what the endpoint returns, what inputs it expects, or what 'trades/104' represents. No OpenAPI schema, no examples, and all doc pages are 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'/request':16,34 '/trades/104':193 '0.02':15,33,89,125 '000':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':102 '20':120 '402':202 '6':129 'Base network API' 'USDC micropayment API' 'accept':112 'access':7,25,44 'actual':195 'addit':174 'ai':76 'amount':118 'analyt':75 'api':6,24,43,84,132,160 'attach':141 'base':9,27,97,122 'base-network' 'bodi':185 'broader':71 'call':4,22,221 'caller':139 'captur':204 'challeng':105,203 'confirm':106,200 'connect':169 'contract':101 'crawl':158 'crypto payment API' 'data':57,74,191 'decim':130 'descript':188 'detail':176 'difficult':212 'doc':159 'document':66,153,209 'endpoint':38,58,108,194,198 'exact':61 'exampl':183 'expect':217 'extrem':155 'financ':79 'finance/trading-related':56 'given':126 'header':146 'i.e':124 'infrastructur':82 'key':133 'know':214 'lack':207 'learn':78 'limit':136 'live':110,201 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':77 'make':210 'maximum':117 'network':10,28,98 'no-api-key' 'offer':73 'openapi':180 'oper':69 'page':164 'path':52 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'payload':63 'payment':48,92,145,151 'per':3,21,90 'per-call-pricing' 'platform':72 'post':113 'post-method' 'premium':5,23,42 'price':86,161 'prompt':171 'proof':152 'protocol':13,31,49 'provid':41,68 'rate':135 'readm':163 'render':166 'request':91,114 'request/response':184 'requir':138 'respons':62 'return':196 'schema':181 'settl':94 'simpli':140 'spars':156 'specif':51 'success':220 'suggest':54 'technic':175 'though':59 'trade data API' 'uniform':87 'unit':123 'usdc':18,36,100,127 'usdc-settlement' 'use':99 'util':83 'valid':149 'via':11,29,45 'wallet':170 'web3':80 'x':144 'x-payment':143 'x402':12,30,47,104,150 'x402 endpoint' 'x402-payment'","prices":[{"id":"f571e4cc-efd0-432b-a8bd-747e404f5443","listingId":"435dbccf-5de7-4890-b64c-2cdbaec1c83f","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/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:32.781Z"}],"sources":[{"listingId":"435dbccf-5de7-4890-b64c-2cdbaec1c83f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/104","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:32.781Z","lastSeenAt":"2026-04-26T08:32:38.498Z"}],"details":{"listingId":"435dbccf-5de7-4890-b64c-2cdbaec1c83f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/104 \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base network at maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/trades/104"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/104"}],"useCases":["Fetching trade or financial data without subscription commitments","Programmatic access to premium data with per-request USDC micropayments","Agent-driven workflows that need on-demand paid API calls settled on-chain"],"bestFor":["Developers wanting no-signup, pay-as-you-go API access","AI agents with Base network USDC wallets needing trade data","Projects that prefer on-chain micropayments over traditional API key billing"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who want bulk pricing or subscriptions","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.595Z"},"updatedAt":"2026-04-26T08:32:38.498Z"}}