{"id":"a3777b42-f0db-4d07-b5a2-b8483b867f71","shortId":"pvKkjY","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, paid per-call in USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com exposes a POST-based API for portfolio transactions at `/api/v1/portfolios/56/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-payable endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints on the platform use the x402 protocol on the Base network, settling in USDC.\n\nThe specific endpoint probed here returns a valid x402 challenge with a maximum amount of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all its APIs, with no API keys, no rate limits, and no minimum commitments required. Payment is made via the x402 `exact` scheme to a specified wallet address on Base.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the portfolio transactions endpoint actually returns or expects as input. The endpoint's purpose (portfolio transaction data, creation, or something else) cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","post-endpoint","portfolio-transactions","per-call-pricing"],"categories":["finance","web3"],"synonyms":["portfolio transactions API","x402 finance endpoint","USDC pay-per-call API","lowpaymentfee portfolio","Base network API","crypto portfolio endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; the expected POST body and response format are unknown.","The specific purpose of /api/v1/portfolios/56/transactions is unclear — it could be transaction creation, retrieval, or something else.","The hardcoded portfolio ID '56' in the URL suggests this may be a demo or placeholder endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/56/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/56/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, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint does beyond the generic label 'Premium API Access'. The docs pages are empty. This is effectively a stub 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'/request':121 '0.02':107,120 '000':102 '20':101 '6':114 'Base network API' 'USDC pay-per-call API' 'across':123 'actual':196 'address':151 'advertis':118 'ai/ml':63 'amount':99 'analyt':62 'api':38,126,129,163 'avail':217 'base':8,22,37,81,103,153 'base-network' 'broader':49 'call':12,26 'cannot':213 'challeng':95 'commit':137 'confirm':215 'connect':172 'content':178 'creation':209 'crypto portfolio endpoint' 'data':61,66,208 'decim':115 'descript':189 'doc':162 'document':154 'dozen':54 'els':212 'endpoint':6,20,30,59,71,88,195,203 'exact':145 'exampl':186 'expect':199 'expos':33 'extrem':159 'finance/web3':65 'gate':3,17 'infer':64 'input':201 'key':130 'limit':133 'lowpaymentfee portfolio' 'lowpaymentfee.com':32,51 'made':141 'materi':218 'maximum':98 'minimum':136 'network':82 'offer':53 'openapi':182 'page':167 'paid':9,23 'part':46 'payabl':58 'payment':139 'per':11,25,109 'per-cal':10,24 'per-call-pricing' 'platform':50,74,117 'portfolio':4,18,40,193,206 'portfolio transactions API' 'portfolio-transactions' 'post':36 'post-bas':35 'post-endpoint' 'price':122,164 'probe':89 'prompt':174 'protocol':78 'purpos':205 'rate':132 'readm':166 'render':169 'request':110 'request/response':185 'requir':138 'return':91,197 'schema':183 'scheme':146 'servic':69 'settl':83 'sinc':111 'site':157 'someth':211 'span':60 'spars':160 'specif':87 'specifi':149 'substant':177 'transact':5,19,41,194,207 'uniform':119 'unit':104 'usd':108 'usdc':14,28,85,106,112 'usdc-settlement' 'use':75,113 'util':68 'valid':93 'via':142 'wallet':150,173 'x402':2,16,57,77,94,144 'x402 finance endpoint' 'x402-gated':1,15 'x402-payable':56 'x402-payment'","prices":[{"id":"1a2df77f-d831-4116-a3ce-8cd33d992ca1","listingId":"a3777b42-f0db-4d07-b5a2-b8483b867f71","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/56/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":"2026-04-18T18:53:09.708Z"}],"sources":[{"listingId":"a3777b42-f0db-4d07-b5a2-b8483b867f71","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/56/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:09.708Z","lastSeenAt":"2026-04-23T02:01:26.930Z"}],"details":{"listingId":"a3777b42-f0db-4d07-b5a2-b8483b867f71","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/56/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/56/transactions"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/56/transactions"}],"useCases":["Submitting or retrieving portfolio transaction data via a pay-per-call model","Integrating portfolio transaction operations into agent workflows without API key management","Programmatic access to portfolio data settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-request portfolio transaction access","AI agents that can settle x402 payments on Base","Users who prefer micro-payment models over subscription APIs"],"notFor":["Users needing detailed API documentation or request/response schemas before integration","High-volume use cases where per-call pricing may add up compared to flat-rate plans","Anyone unable to pay in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.141Z"},"updatedAt":"2026-04-23T02:01:26.930Z"}}