{"id":"dbd2f7d0-132d-4109-9bb8-3ccfa795eb12","shortId":"uMM2GM","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/29/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, no rate limits, and no commitments required.\n\nPayment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge specifies 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 beyond the landing page; the docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause this specific endpoint path (`/portfolios/29/transactions`) suggests it is scoped to a particular portfolio (ID 29), it is unclear whether the caller can parameterize the portfolio ID or whether this is a fixed demo/sample resource. The platform advertises many other endpoints across analytics, AI, finance, and utility categories, all at the same $0.02 price point. Without request/response schema documentation, the exact input format and output structure 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","Base network API","lowpaymentfee","crypto portfolio data"],"warnings":["No OpenAPI or request/response schema available — input and output formats are unknown.","Documentation pages (/docs, /pricing, /api, /README) all return only 'Connect wallet' with no substantive content.","The endpoint path includes a hardcoded portfolio ID (29); it is unclear if this is parameterizable or a fixed resource.","The platform lists many endpoints on its landing page but none have documented schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/29/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/29/transactions","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 challenge with clear pricing, but there is no OpenAPI schema, no request/response documentation, and all doc pages return only a wallet-connect prompt. The specific endpoint path (/portfolios/29) is ambiguous. Effectively a stub 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'/portfolios/29/transactions':158 '/request':14,28 '0.02':13,27,68,108,205 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20000':100 '29':168 '300':121 '6':105 'Base network API' 'USDC micropayment API' 'access':37 'across':194 'advertis':190 'ai':196 'ai/ml':58 'analyt':57,195 'api':64,73,140 'base':9,23,87,101 'base-network' 'beyond':132 'broader':53 'call':4,18,111 'caller':174 'categori':200 'challeng':95 'commit':80 'connect':146 'content':152 'contract':91 'crypto portfolio data' 'data':41,56 'decim':106 'demo/sample':186 'detail':128 'doc':137 'document':129,211 'enabl':32 'endpoint':7,21,33,113,156,193 'equal':107 'exact':116,213 'financ':197 'finance/web3':60 'fix':185 'format':215 'found':131 'id':167,179 'infer':59 'infrastructur':62 'input':214 'key':74 'land':134 'limit':77 'lowpaymentfee' 'lowpaymentfee.com':35 'mani':191 'maxamountrequir':98 'network':88 'no-api-key' 'offer':55 'openapi':125 'output':217 'page':135,141 'parameter':176 'part':50 'particular':165 'path':157 'pay':2,16 'pay-per-cal':1,15 'pay-per-call API' 'pay-per-request' 'payment':82,117 'per':3,17,69,110 'platform':54,189 'point':207 'portfolio':5,19,39,166,178 'portfolio transactions API' 'portfolio-transactions' 'post':44 'price':66,138,206 'prompt':148 'provid':36 'rate':76 'remain':219 'request':45,70 'request/response':209 'requir':81 'resourc':187 'return':143 'schema':126,210 'scheme':118 'scope':162 'second':122 'settl':84 'specif':155 'specifi':96 'structur':218 'substant':151 'suggest':159 'timeout':123 'transact':6,20,40 'unclear':171 'unit':102 'unknown':220 'usd':109 'usdc':12,26,90 'usdc-settlement' 'use':89,114 'util':63,199 'via':10,24,42 'wallet':147 'whether':172,181 'without':208 'x402':11,25,31,94 'x402 finance endpoint' 'x402-enabled':30 'x402-payment'","prices":[{"id":"f0b1f814-2ad8-4112-8aa5-abc25a4c2c9f","listingId":"dbd2f7d0-132d-4109-9bb8-3ccfa795eb12","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/29/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":"2026-04-18T18:52:36.330Z"}],"sources":[{"listingId":"dbd2f7d0-132d-4109-9bb8-3ccfa795eb12","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/29/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:36.330Z","lastSeenAt":"2026-04-28T03:33:43.646Z"}],"details":{"listingId":"dbd2f7d0-132d-4109-9bb8-3ccfa795eb12","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/29/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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/29/transactions"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/29/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 API access without signup or API keys","Agents that can settle x402 payments in USDC on Base","Low-volume or sporadic access to portfolio transaction data"],"notFor":["High-volume bulk data export (no documented batch endpoints)","Users who need detailed API documentation or response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.757Z"},"updatedAt":"2026-04-28T03:33:43.646Z"}}