{"id":"155701ca-791c-40ff-9791-f53b4e8c1c70","shortId":"9uB3Da","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/193` 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/193` is not documented beyond the generic label \"Premium API Access.\" The platform's landing page lists categories like analytics metrics, AI sentiment analysis, text summarization, price feeds, geocoding, and more, but this particular trades endpoint is not among the listed APIs. It may represent a trade-specific data resource (e.g., details for trade ID 193), but this is speculative. Documentation pages (/docs, /pricing, /README) all returned only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","trades API","crypto payment API"],"warnings":["The specific endpoint /api/v1/trades/193 is not listed among the platform's advertised APIs — its exact functionality is unclear.","All documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no usable content.","No request body schema or response schema is available; callers must experiment to discover the expected input/output format.","No OpenAPI spec or AI plugin manifest was found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/193","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/193","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 pricing and payment details. However, there is no documentation for the specific /api/v1/trades/193 resource, no request/response schema, and the docs/pricing/README pages are empty. The endpoint's actual functionality is unknown beyond its generic 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'/docs':230 '/pricing':231 '/readme':232 '0.02':10,28,88,136 '000':127 '0x8335':110 '193':223 '20':126 '2913':111 '6':132 'Base network API' 'USDC micropayment API' 'accept':95 'access':6,24,44,177 'ai':188 'ai/ml':78 'among':205 'amount':121 'analysi':190 'analyt':77,186 'api':5,16,23,34,43,73,140,176,208 'appear':58 'attach':151 'base':8,26,52,113,128 'base-network' 'behind':166 'beyond':171 'broader':64 'call':72,124 'caller':149 'categori':184 'chain':106 'commit':148 'connect':237 'content':243 'contract':109 'crypto payment API' 'data':76,81,216 'decim':133 'detail':219 'document':170,228 'dozen':67 'e.g':218 'endpoint':38,74,94,202 'equal':135 'exact':117 'feed':194 'finance/web3':80 'function':165 'gate':3,21 'generic':173 'geocod':195 'header':156 'id':222 'infer':79 'infrastructur':83 'json':100 'json-response' 'key':17,35,141 'label':174 'land':181 'like':185 'limit':144 'list':183,207 'lowpaymentfee' 'lowpaymentfee.com':40 'maximum':120 'may':210 'metric':187 'network':53 'no-api-key' 'offer':66 'on-chain':104 'page':182,229 'part':61 'particular':200 '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':65,179 'post':96 'post-method' 'premium':4,22,42,175 'price':86,193 'prompt':239 'proof':162 'protocol':49 'provid':41 'rate':143 'repres':211 'request':12,30,90,97 'requir':18,36,122 'resourc':56,217 'return':99,234 'scheme':118 'sentiment':189 'settl':103 'simpli':150 'span':75 'specif':55,164,215 'specul':227 'subscript':147 'summar':192 'text':191 'trade':201,214,221 'trade-specif':213 'trades API' 'unit':129 'usdc':14,32,92,108,131 'usdc-settlement' 'use':114 'util':84 'valid':159 'via':45,107 'wallet':238 'x':154 'x-payment':153 'x402':2,20,47,116,160 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"0b887c80-f988-48c1-8957-164e5ad8c469","listingId":"155701ca-791c-40ff-9791-f53b4e8c1c70","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/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:47.352Z"}],"sources":[{"listingId":"155701ca-791c-40ff-9791-f53b4e8c1c70","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/193","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:47.352Z","lastSeenAt":"2026-04-26T05:32:45.912Z"}],"details":{"listingId":"155701ca-791c-40ff-9791-f53b4e8c1c70","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/193 \\\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/193"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/193"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or premium content behind a per-request USDC paywall","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to various data and utility endpoints"],"bestFor":["AI agents that need keyless, on-demand API access settled in USDC on Base","Developers prototyping x402 payment flows with low-cost endpoints","Applications requiring per-call billing without subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.848Z"},"updatedAt":"2026-04-26T05:32:45.912Z"}}