{"id":"52e494b3-fe2a-45cf-bd8c-f68efed1fdd2","shortId":"BrLFwj","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/178` 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/178` is not documented in the crawled material. The path suggests it may return trade data for a specific trade or asset ID (178), but this is speculative. The broader platform lists endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further technical detail.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["finance","data"],"synonyms":["trade data API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto trade endpoint"],"warnings":["No documentation available for /api/v1/trades/178 — purpose and response format are unknown","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no technical content","No OpenAPI or schema definition found","The specific meaning of trade ID 178 is not explained anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/178","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/178","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation for what /api/v1/trades/178 actually returns. The docs, pricing, and README pages all returned only 'Connect wallet' with no useful content. The specific purpose of this endpoint is 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'0.02':10,28,88,136,229 '000':127 '0x8335':110 '178':190 '20':126 '2913':111 '6':132 'Base network API' 'USDC micropayment API' 'accept':95 'access':6,24,44 'ai/ml':78 'amount':121 'analysi':207 'analyt':77 'api':5,16,23,34,43,73,140 'appear':58 'asset':188 'attach':151 'base':8,26,52,113,128 'base-network' 'behind':166 'beyond':234 'broader':64,196 'call':72,124 'caller':149 'chain':106 'classif':210 'commit':148 'connect':241 'contract':109 'convers':222 'crawl':173 'crypto trade endpoint' 'data':76,81,182,203 'decim':133 'detail':248 'document':170,232 'dozen':67 'embed':211 'endpoint':38,74,94,199 'equal':135 'estim':219 'exact':117 'exchang':214 'export':204 'feed':213 'finance/web3':80 'function':165 'gas':218 'gate':3,21 'generat':224 'geocod':220 'header':156 'id':189 'infer':79 'infrastructur':83 'insight':205 'json':100 'json-response' 'key':17,35,141 'land':236 'limit':144 'list':198 'lowpaymentfee' 'lowpaymentfee.com':40 'materi':174 'maximum':120 'may':179 'metric':201 'network':53 'no-api-key' 'offer':66 'on-chain':104 'page':233,237 'part':61 'path':176 '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':65,197 'point':231 'post':96 'post-method' 'premium':4,22,42 'premium API access' 'price':86,212,230 'prompt':243 'proof':162 'protocol':49 'provid':41 'quot':217 'rate':143,215 'report':202 'request':12,30,90,97 'requir':18,36,122 'resourc':56 'return':99,180,238 'scheme':118 'sentiment':206 'settl':103 'simpli':150 'span':75 'specif':55,164,185 'specul':194 'subscript':147 'suggest':177 'summar':209 'technic':247 'text':208 'token':216 'trade':181,186 'trade data API' 'unit':129 'usdc':14,32,92,108,131 'usdc-settlement' 'use':114 'util':84 'valid':159,221 'via':45,107 'wallet':242 'x':154 'x-payment':153 'x402':2,20,47,116,160 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"c947d4d2-2426-4547-b0dd-2ada7b3e604f","listingId":"52e494b3-fe2a-45cf-bd8c-f68efed1fdd2","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/178","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:46.763Z"}],"sources":[{"listingId":"52e494b3-fe2a-45cf-bd8c-f68efed1fdd2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/178","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:46.763Z","lastSeenAt":"2026-04-26T05:32:45.842Z"}],"details":{"listingId":"52e494b3-fe2a-45cf-bd8c-f68efed1fdd2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/178 \\\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 x402Version 1, scheme 'exact', network 'base', maxAmountRequired 20000 USDC base units","source_url":"https://lowpaymentfee.com/api/v1/trades/178"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/178"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade data for a specific trade or asset without needing an API key","Programmatic access to paid endpoints using on-chain USDC micropayments on Base","Agent-driven workflows that need low-friction, keyless API access with per-call billing"],"bestFor":["Developers or agents who want keyless, pay-per-use API access","On-chain payment workflows using USDC on Base","Low-cost micropayment API consumption at $0.02/call"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who prefer subscription-based pricing over per-call payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.956Z"},"updatedAt":"2026-04-26T05:32:45.842Z"}}