{"id":"283a192c-220c-451b-a0e0-12fcc9b13f53","shortId":"AwWejF","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/trades/131` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request and settle in USDC on Base.\n\nHowever, the specific `/api/v1/trades/131` endpoint does not appear in the site's publicly listed API catalog, and no documentation describes what data or functionality it returns. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no further content. Without request/response schemas or documentation for this particular endpoint, its exact behavior is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","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","trades endpoint","lowpaymentfee","premium API access"],"warnings":["The /api/v1/trades/131 endpoint is not listed in the site's public API catalog — its purpose and response format are undocumented.","All documentation pages (docs, pricing, API, README) rendered only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","The endpoint's actual behavior and data returned are completely unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/131","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/131","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 returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation, no request/response schema, and the specific /api/v1/trades/131 path is not listed in the site's public catalog. The docs/pricing/API pages are empty beyond a wallet-connect prompt. The actual functionality of this endpoint is 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'/request':13,28 '0.02':12,27,80,151 '000':74 '20':73 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':7,22,62 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':6,21,38,61,84,110,174,190 'appear':167 'attach':93 'base':9,24,51,75,159 'behavior':214 'broader':106 'call':4,19,82 'caller':91 'catalog':175 'categori':111 'challeng':67 'classif':127 'connect':196 'content':202 'convers':144 'data':113,117,181 'describ':179 'doc':187 'document':178,207 'embed':128 'endpoint':55,147,164,211 'estim':138 'exact':213 'exchang':133 'export':118 'feed':132 'financ':129 'function':183 'gas':137 'generat':145 'geocod':142 'header':98 'howev':160 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'json-response' 'key':85 'learn':122 'limit':88 'list':58,173 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'metric':115 'multipl':109 'network':52 'no-api-key' 'page':191 'particular':210 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,97,103 'per':3,18,36,81,152 'platform':39,107 'post-method' 'premium':5,20,60 'premium API access' 'price':131,149,188 'prompt':198 'proof':104 'protocol':44 'public':172 'quot':136 'rate':87,134 'render':193 'report':116 'request':37,153 'request/response':204 'requir':68,90 'return':64,185 'schema':205 'sentiment':123 'settl':155 'simpli':92 'site':170 'specif':54,162 'summar':126 'text':125 'token':135 'trades endpoint' 'unit':76 'unknown':216 'usdc':15,30,47,78,157 'usdc-base' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':197 'web3':130 'without':203 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"ed6bbf2e-d100-4beb-9364-1eb2c31cc3bb","listingId":"283a192c-220c-451b-a0e0-12fcc9b13f53","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/131","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:32.795Z"}],"sources":[{"listingId":"283a192c-220c-451b-a0e0-12fcc9b13f53","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/131","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:32.795Z","lastSeenAt":"2026-04-26T08:03:30.498Z"}],"details":{"listingId":"283a192c-220c-451b-a0e0-12fcc9b13f53","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/131 \\\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","source_url":"https://lowpaymentfee.com/api/v1/trades/131"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/131"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists API categories including Data & Analytics, AI & ML, 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 keys","Programmatic micropayment-gated data retrieval on Base"],"bestFor":["Agents or scripts that need keyless, pay-as-you-go API access","Developers experimenting with x402 payment flows on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume batch consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.584Z"},"updatedAt":"2026-04-26T08:03:30.498Z"}}