{"id":"cb87215a-c2b3-4a95-b239-2beca0ed52f9","shortId":"KBRdJR","kind":"x402","title":"Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).","tagline":"Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/71/transactions`. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request with no API keys, rate limits, or commitments required.\n\nPayment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge advertises a `maxAmountRequired` of 20000 base units, which at 6 decimals equals $0.02 USD per call. The endpoint uses the \"exact\" payment scheme with a 300-second timeout. No OpenAPI schema or detailed documentation was found for this specific endpoint beyond the x402 challenge metadata.\n\nThe specific endpoint listed here (`/portfolios/71/transactions`) appears to be a single portfolio's transaction resource. The broader platform advertises many other endpoints across categories like sentiment analysis, text summarization, price feeds, geocoding, and more — all at the same $0.02 price point. However, documentation pages returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 finance endpoint","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto portfolio data"],"warnings":["No OpenAPI or request/response schema available for this endpoint","Documentation pages (/docs, /pricing, /README, /api) all returned only 'Connect wallet' with no substantive content","The endpoint targets a hardcoded portfolio ID (71); unclear if this is a demo or a real resource","Actual response format and error handling are completely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/71/transactions","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/portfolios/71/transactions","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 challenge with clear pricing, but there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages all returned only a 'Connect wallet' stub. The purpose of this specific endpoint (portfolios/71/transactions) is only inferable from the URL 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'/portfolios/71/transactions':144 '/request':14,28 '0.02':13,27,68,106,177 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':90 '20000':98 '300':119 '6':103 'Base network API' 'USDC micropayment API' 'access':37 'across':161 'actual':195 'advertis':94,157 'ai/ml':58 'analysi':165 'analyt':57 'api':64,73 'appear':145 'base':9,23,85,99 'base-network' 'beyond':134 'broader':53,155 'call':4,18,109 'categori':162 'challeng':93,137 'commit':78 'connect':186 'content':192 'contract':89 'crypto portfolio data' 'data':41,56 'decim':104 'detail':126 'document':127,181 'enabl':32 'endpoint':7,21,33,111,133,141,160,200 'equal':105 'exact':114 'feed':169 'finance/web3':60 'found':129 'geocod':170 'howev':180 'infer':59 'infrastructur':62 'key':74 'like':163 'limit':76 'list':142 'lowpaymentfee' 'lowpaymentfee.com':35 'mani':158 'maxamountrequir':96 'metadata':138 'network':86 'no-api-key' 'offer':55 'openapi':123 'page':182 'part':50 'pay':2,16 'pay-per-cal':1,15 'pay-per-call API' 'pay-per-request' 'payment':80,115 'per':3,17,69,108 'platform':54,156 'point':179 'portfolio':5,19,39,150 'portfolio transactions API' 'portfolio-transactions' 'post':44 'price':66,168,178 'prompt':188 'provid':36 'rate':75 'remain':201 'request':45,70 'request/response':196 'requir':79 'resourc':153 'return':183 'schema':124,197 'scheme':116 'second':120 'sentiment':164 'settl':82 'singl':149 'specif':132,140 'substant':191 'summar':167 'text':166 'timeout':121 'transact':6,20,40,152 'unit':100 'unknown':202 'usd':107 'usdc':12,26,88 'usdc-settlement' 'use':87,112 'util':63 'via':10,24,42 'wallet':187 'x402':11,25,31,92,136 'x402 finance endpoint' 'x402-enabled':30 'x402-payment'","prices":[{"id":"73ca85a3-142d-43a9-a233-0a56f16988c0","listingId":"cb87215a-c2b3-4a95-b239-2beca0ed52f9","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/portfolios/71/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:15.228Z"}],"sources":[{"listingId":"cb87215a-c2b3-4a95-b239-2beca0ed52f9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/71/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:15.228Z","lastSeenAt":"2026-04-27T18:36:24.409Z"}],"details":{"listingId":"cb87215a-c2b3-4a95-b239-2beca0ed52f9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/71/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/71/transactions"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/71/transactions"}],"useCases":["Fetching transaction history for a specific portfolio","Integrating portfolio transaction data into dashboards or analytics pipelines","Agent-driven portfolio monitoring with per-call payment"],"bestFor":["Developers wanting keyless, pay-per-use portfolio transaction data","AI agents that can settle x402 payments on Base","Low-volume or sporadic access patterns where subscription pricing is wasteful"],"notFor":["High-volume bulk data export (no documented batch endpoints)","Users who need detailed API documentation or response schema guarantees before integrating","Non-crypto-native users without USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.915Z"},"updatedAt":"2026-04-27T18:36:24.409Z"}}