{"id":"0282e074-b72f-4077-9076-a3305327a35e","shortId":"bqnZTM","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 (portfolio ID 65) via the x402 payment protocol. It accepts POST requests and is gated behind a per-call USDC micropayment on the Base network. The x402 challenge confirms the endpoint is live and requires a maximum of 20,000 base units of USDC (0.02 USD) per request, settled to a specified wallet address.\n\nThe broader lowpaymentfee.com platform advertises a range of API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and instant access. However, the specific endpoint being listed here (/api/v1/portfolios/65/transactions) is not explicitly documented on the site's landing page or in any crawled documentation. No OpenAPI schema, request/response examples, or detailed docs were found for this endpoint. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause there is no schema or documentation describing what fields this endpoint accepts or returns, consumers should treat this as a minimally documented endpoint. The payment mechanism is confirmed working (402 challenge captured), but the actual data contract is unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","portfolio-transactions","pay-per-call","no-api-key"],"categories":["finance"],"synonyms":["portfolio transactions","transaction history","x402 API","USDC micropayment API","Base network API","lowpaymentfee","pay-per-request API"],"warnings":["No OpenAPI schema or endpoint documentation found for /api/v1/portfolios/65/transactions","This specific endpoint is not listed among the site's advertised APIs on the landing page","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no content","Request and response formats are completely unknown — no schema or examples available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/65/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/65/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation for this specific endpoint — no request/response schema, no examples, and the crawled docs pages are empty. The endpoint path itself is not listed among the site's advertised APIs, making it unclear what data it actually 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'0.02':84,118 '000':79 '20':78 '402':215 '65':41 'Base network API' 'USDC micropayment API' 'accept':48,197 'access':34,130 'actual':220 'address':93 'advertis':98 'ai':107 'analyt':106 'api':102,123,169 'base':8,22,63,80 'base-network' 'behind':54 'broader':95 'call':12,26,58 'captur':217 'categori':103 'challeng':67,216 'confirm':68,213 'connect':178 'consum':200 'content':184 'contract':222 'crawl':152 'data':38,105,221 'describ':192 'detail':160 'doc':161,168 'document':142,153,191,207 'endpoint':6,20,30,70,134,166,196,208 'exampl':158 'explicit':141 'field':194 'financ':110 'found':163 'gate':3,17,53 'howev':131 'id':40 'includ':104 'infrastructur':113 'instant':129 'key':124 'land':147 'learn':109 'limit':127 'list':136 'live':72 'lowpaymentfee' 'lowpaymentfee.com':32,96 'machin':108 'maximum':76 'mechan':211 'micropay':60 'minim':206 'network':64 'no-api-key' 'openapi':155 'page':148,173 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request API' 'payment':45,210 'per':11,25,57,86,119 'per-cal':56 'platform':97 'portfolio':4,18,36,39 'portfolio transactions' 'portfolio-transactions' 'post':49 'price':116,170 'prompt':180 'protocol':46 'provid':33 'rang':100 'rate':126 'readm':172 'request':50,87,120 'request/response':157 'requir':74 'return':175,199 'schema':156,189 'settl':88 'site':145 'specif':133 'specifi':91 'substant':183 'transact':5,19,37 'transaction history' 'treat':202 'unit':81 'unknown':224 'usd':85 'usdc':14,28,59,83 'usdc-micropayment' 'util':114 'via':42 'wallet':92,179 'web3':111 'work':214 'x402':2,16,44,66 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1c27c0c8-11aa-4fc0-8cbb-84f7bb58cb90","listingId":"0282e074-b72f-4077-9076-a3305327a35e","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/65/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":"2026-04-18T18:53:18.221Z"}],"sources":[{"listingId":"0282e074-b72f-4077-9076-a3305327a35e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/65/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:18.221Z","lastSeenAt":"2026-04-28T04:34:07.689Z"}],"details":{"listingId":"0282e074-b72f-4077-9076-a3305327a35e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/65/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units (0.02 USD)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/65/transactions"},{"claim":"The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/65/transactions"}],"useCases":["Retrieving transaction records 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-call access to portfolio transaction data","AI agents that can settle x402 USDC payments on Base","Quick prototyping without subscription commitments"],"notFor":["Users needing detailed API documentation or guaranteed response schemas","High-volume batch processing where per-call fees add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.78Z"},"updatedAt":"2026-04-28T04:34:07.689Z"}}