{"id":"707ebcbe-6bf7-41ef-9821-60b3cacaf7ed","shortId":"tvCBxP","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via the x402 payment protocol. The specific resource `/api/v1/portfolios/44/transactions` accepts POST requests and charges up to $0.02 per call in USDC on the Base network. Payment is handled inline via the x402 header mechanism — no API keys, accounts, or rate limits are required.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. However, this specific listing covers only the portfolio transactions resource. The x402 challenge confirms the endpoint is live, accepting payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the transactions endpoint accepts or returns. The endpoint's actual functionality (what portfolio 44 is, what transaction data is returned, what POST body is expected) is entirely unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","portfolio-transactions","post-endpoint"],"categories":["finance"],"synonyms":["portfolio transactions API","x402 finance endpoint","pay-per-call transactions","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; request body format and response structure are completely unknown","The purpose of 'portfolios/44' is unexplained — it is unclear whether this is a demo, a specific user portfolio, or a generic resource","Platform appears to list many endpoints but none have visible documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/44/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/44/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'0.02':55,114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':142 '44':193 'Base network API' 'USDC micropayment API' 'accept':48,135,183 'access':34 'account':76 'actual':189 'address':138 'ai/ml':104 'analyt':103 'api':74,100,153 'avail':210 'base':8,22,62,144 'bodi':202 'broader':88 'call':12,26,57 'challeng':129 'charg':52 'confirm':130 'connect':159 'cover':121 'data':38,102,107,197 'descript':176 'detail':165 'doc':150 'document':145 'endpoint':6,20,30,83,132,182,187 'entir':206 'exampl':173 'expect':204 'extrem':147 'field':179 'finance/web3':106 'function':190 'gate':3,17 'handl':66 'header':71 'howev':117 'infer':105 'inlin':67 'key':75 'limit':79 'list':120 'live':134 'lowpaymentfee' 'lowpaymentfee.com':32,90 'materi':211 'mechan':72 'network':63 'offer':92 'openapi':169 'page':154 'part':85 'pay':10,24,97 'pay-per-cal':9,23 'pay-per-call transactions' 'pay-per-request':96 'payment':42,64,136 'per':11,25,56,98,115 'platform':89 'portfolio':4,18,36,124,192 'portfolio transactions API' 'portfolio-transactions' 'post':49,201 'post-endpoint' 'price':112,151 'prompt':161 'protocol':43 'provid':33 'rate':78 'render':156 'request':50,99,116 'request/response':172 'requir':81 'resourc':46,126 'return':185,199 'schema':170 'servic':110 'span':101 'spars':148 'specif':45,119 'transact':5,19,37,125,181,196 'unknown':207 'usdc':14,28,59,141 'usdc-base' 'use':140 'util':109 'varieti':94 'via':39,68 'wallet':160 'x402':2,16,41,70,128 'x402 finance endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ad9b4f4f-fc14-4ee7-9fa9-d9af3123fda8","listingId":"707ebcbe-6bf7-41ef-9821-60b3cacaf7ed","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/44/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":"2026-04-18T18:52:51.866Z"}],"sources":[{"listingId":"707ebcbe-6bf7-41ef-9821-60b3cacaf7ed","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/44/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:51.866Z","lastSeenAt":"2026-04-28T11:08:49.499Z"}],"details":{"listingId":"707ebcbe-6bf7-41ef-9821-60b3cacaf7ed","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/44/transactions\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with valid USDC payment on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 v1 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/44/transactions"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/44/transactions"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/44/transactions"},{"claim":"Docs, pricing, and API pages render only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching transaction history for a specific portfolio via micropayment","Integrating pay-per-call portfolio data into agent workflows","Accessing financial transaction data without API key registration"],"bestFor":["Agents needing keyless, pay-per-call access to portfolio transaction data","Developers experimenting with x402 payment protocol integrations","Use cases where avoiding API key management is valuable"],"notFor":["Production systems requiring documented request/response schemas","Users needing bulk or high-volume transaction data at lower per-call cost","Anyone needing clarity on what data is actually returned before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.97Z"},"updatedAt":"2026-04-28T11:08:49.499Z"}}