{"id":"037787d6-d429-42fb-b6b9-6d624536cfeb","shortId":"WgzDq9","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific resource `/api/v1/trades/68` appears to be part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request in USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled on-chain via USDC (contract 0x8335…2913) on Base, using the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific functionality behind `/api/v1/trades/68` is not documented in the crawled material. The platform's landing page lists categories like Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure, but this particular trades endpoint is not among the listed APIs. It may represent a trade-specific data resource or a dynamically generated endpoint. Without further documentation or example responses, the exact data returned is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["finance","data"],"synonyms":["trades API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto payment API"],"warnings":["The /api/v1/trades/68 endpoint is not listed among the platform's advertised APIs — its purpose and response format are undocumented.","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no usable content.","No OpenAPI spec, no request/response schemas, and no example payloads are available.","The exact data returned by this endpoint is unknown; callers should test with a small payment first."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/68","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/68","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. However, there is no documentation for the /api/v1/trades/68 resource specifically — no request schema, no response schema, no example payloads, and the docs/pricing/README pages are all blank (just 'Connect wallet'). The endpoint's actual functionality is 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'0.02':10,28,88,136 '000':127 '0x8335':110 '20':126 '2913':111 '6':132 'Base network API' 'USDC micropayment API' 'accept':95 'access':6,24,44 'ai':185 'ai/ml':78 'among':199 'amount':121 'analyt':77,184 'api':5,16,23,34,43,73,140,202 'appear':58 'attach':151 'base':8,26,52,113,128 'base-network' 'behind':166 'broader':64 'call':72,124 'caller':149 'categori':181 'chain':106 'commit':148 'contract':109 'crawl':173 'crypto payment API' 'data':76,81,183,210,225 'decim':133 'document':170,219 'dozen':67 'dynam':214 'endpoint':38,74,94,196,216 'equal':135 'exact':117,224 'exampl':221 'financ':188 'finance/web3':80 'function':165 'gate':3,21 'generat':215 'header':156 'infer':79 'infrastructur':83,191 'json':100 'json-response' 'key':17,35,141 'land':178 'learn':187 'like':182 'limit':144 'list':180,201 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':186 'materi':174 'maximum':120 'may':204 'network':53 'no-api-key' 'offer':66 'on-chain':104 'page':179 'part':61 'particular':194 'pay':9,27,70 'pay-per-cal':69 'pay-per-call API' 'pay-per-request' 'payment':48,101,155,161 'per':11,29,71,89,123 'platform':65,176 'post':96 'post-method' 'premium':4,22,42 'premium API access' 'price':86 'proof':162 'protocol':49 'provid':41 'rate':143 'repres':205 'request':12,30,90,97 'requir':18,36,122 'resourc':56,211 'respons':222 'return':99,226 'scheme':118 'settl':103 'simpli':150 'span':75 'specif':55,164,209 'subscript':147 'trade':195,208 'trade-specif':207 'trades API' 'unclear':228 'unit':129 'usdc':14,32,92,108,131 'usdc-settlement' 'use':114 'util':84 'valid':159 'via':45,107 'web3':189 'without':217 'x':154 'x-payment':153 'x402':2,20,47,116,160 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"3c46987c-2756-4a4a-86ee-8e2b65a93e9a","listingId":"037787d6-d429-42fb-b6b9-6d624536cfeb","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:06.439Z"}],"sources":[{"listingId":"037787d6-d429-42fb-b6b9-6d624536cfeb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:06.439Z","lastSeenAt":"2026-04-26T01:02:58.390Z"}],"details":{"listingId":"037787d6-d429-42fb-b6b9-6d624536cfeb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/68 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/68"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/68"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists API categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade-related data with per-request USDC micropayments on Base","Integrating pay-as-you-go API access into autonomous agents without managing API keys","Accessing premium data endpoints where traditional subscription billing is undesirable"],"bestFor":["Agents or applications that can settle x402 payments on Base in USDC","Developers wanting zero-commitment, pay-per-call API access","Use cases requiring keyless, permissionless API consumption"],"notFor":["Users who need free or fiat-billed API access without crypto wallets","Applications requiring detailed documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.932Z"},"updatedAt":"2026-04-26T01:02:58.390Z"}}