{"id":"c181a1b5-64fa-4bca-8e35-3bebd84b2215","shortId":"SGWRtz","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/33/transactions`. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all gated behind the x402 payment protocol on the Base network.\n\nThe endpoint accepts USDC payments on Base (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment scheme is \"exact\" and settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No API keys are required; access is granted per-request via the X-PAYMENT header. The platform advertises no rate limits and instant access.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the transactions endpoint accepts or returns. The specific portfolio (ID 33) is hardcoded in the URL, and it is unclear whether this represents a fixed demo portfolio or a specific dataset. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-transactions","per-request-billing","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 finance endpoint","USDC pay-per-call API","Base network API","crypto portfolio data","lowpaymentfee API","402 payment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or JSON schema describing request body or response format.","The portfolio ID '33' is hardcoded in the endpoint URL; unclear what data it represents.","No request or response examples available from any source."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/33/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/33/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, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response documentation, no examples, and the docs pages are empty. The purpose and data model of the specific '/portfolios/33/transactions' endpoint are 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'/api/v1/portfolios/33/transactions':44 '/docs':139 '/pricing':141 '/readme':143 '0.02':10,24,93 '000':88 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':107 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':81 '20':87 '33':180 '402':209 '402 payment API' '6':96 'Base network API' 'USDC pay-per-call API' 'accept':75,173 'access':34,113,133 'address':106 'advertis':127 'ai/ml':55 'amount':85 'analyt':54 'api':61,109 'base':8,22,71,79,89 'behind':64 'broader':50 'challeng':210 'confirm':204 'connect':149 'content':155 'contract':80 'crypto portfolio data' 'data':38,53 'dataset':200 'decim':97 'demo':195 'descript':166 'document':134 'endpoint':6,20,30,74,172,202 'equal':92 'exact':102 'exampl':163 'extrem':136 'field':169 'finance/web3':57 'fix':194 'gate':3,17,63 'grant':115 'hardcod':182 'header':124 'id':179 'infer':56 'infrastructur':59 'instant':132 'key':110 'limit':130 'live':205 'lowpaymentfee API' 'lowpaymentfee.com':32 'maximum':84 'network':72 'no-api-key' 'offer':52 'openapi':159 'page':144 'part':47 'pay':9,23 'payment':67,77,99,123 'per':11,25,117 'per-request':116 'per-request-billing' 'platform':51,126 'portfolio':4,18,36,178,196 'portfolio transactions API' 'portfolio-transactions' 'post':41 'prompt':151 'protocol':68 'provid':33 'rate':129 'render':146 'repres':192 'request':12,26,42,118 'request/response':162 'requir':112 'respons':211 'return':175 'schema':160 'scheme':100 'settl':104 'spars':137 'specif':177,199 'transact':5,19,37,171 'unclear':189 'unit':90 'url':185 'usdc':14,28,76,94 'usdc-base' 'use':95 'util':60 'valid':208 'via':39,119,206 'wallet':150 'whether':190 'x':122 'x-payment':121 'x402':2,16,66 'x402 finance endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"effa6671-d0cb-4c3f-8aaf-24cee3f92315","listingId":"c181a1b5-64fa-4bca-8e35-3bebd84b2215","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/33/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":"2026-04-18T18:52:36.929Z"}],"sources":[{"listingId":"c181a1b5-64fa-4bca-8e35-3bebd84b2215","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/33/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:36.929Z","lastSeenAt":"2026-04-28T03:33:43.647Z"}],"details":{"listingId":"c181a1b5-64fa-4bca-8e35-3bebd84b2215","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/33/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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/33/transactions"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/33/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 micropayments"],"bestFor":["Developers wanting keyless, pay-per-request access to portfolio transaction data","AI agents that can settle USDC micropayments on Base","Prototyping x402-based payment flows with low per-call costs"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume batch retrieval where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.753Z"},"updatedAt":"2026-04-28T03:33:43.647Z"}}