{"id":"8a5c9cdf-d2ff-4e27-92a6-131f5a663f71","shortId":"chGh5m","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/69/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-payable APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The challenge advertises a `maxAmountRequired` of 20000 base units, which at 6 decimals equals $0.02 USD. No API keys or rate limits are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The endpoint accepts POST with `application/json` content type.\n\nThe specific functionality of this particular endpoint — portfolio transactions for portfolio ID 69 — is not well-documented. The site's docs, pricing, and API pages all resolve to a minimal \"Connect wallet\" prompt with no further detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the lack of documentation makes it difficult to determine the exact request format or response structure.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","post-api","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment API","Base network API","lowpaymentfee","crypto portfolio data","transaction history API"],"warnings":["No API documentation available — docs, pricing, and API pages all show only a 'Connect wallet' prompt","No request or response schema provided; callers must guess the POST body format","The endpoint targets a hardcoded portfolio ID (69); unclear if this is a demo or production resource","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/69/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/69/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no documentation, no request/response schema, no OpenAPI spec, and no examples. The specific purpose of portfolio 69's transactions endpoint is unclear. Docs pages return only a wallet-connect 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'0.02':10,24,75,107 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20000':99 '402':196 '6':104 '69':151 'Base network API' 'USDC micropayment API' 'accept':133 'access':34 'advertis':95 'ai/ml':65 'analyt':64 'api':61,110,163 'application/json':136 'attach':119 'avail':189 'base':8,22,87,100 'base-network' 'broader':50 'caller':117 'challeng':94,201 'confirm':193 'connect':170 'content':137 'contract':91 'crypto portfolio data' 'data':38,63,68 'decim':105 'detail':176 'determin':211 'difficult':209 'doc':160 'document':156,206 'endpoint':6,20,30,132,145,191 'equal':106 'exact':213 'exampl':187 'finance/web3':67 'format':215 'function':141 'gate':3,17 'handl':80 'header':124 'id':150 'infer':66 'infrastructur':70 'key':111 'lack':204 'limit':114 'live':194 'lowpaymentfee' 'lowpaymentfee.com':32,52 'make':207 'maxamountrequir':97 'minim':169 'network':88 'offer':54 'openapi':180 'page':164 'part':47 'particular':144 'pay':9,23 'pay-per-request' 'payabl':60 'payload':188 'payment':78,123,129 'per':11,25,76 'platform':51 'portfolio':4,18,36,146,149 'portfolio transactions API' 'portfolio-transactions' 'post':41,134 'post-api' 'price':73,161 'prompt':172 'proof':130 'protocol':84 'provid':33 'rate':113 'request':12,26,42,77,214 'request/response':183 'requir':116 'resolv':166 'respons':217 'return':195 'schema':184 'simpli':118 'site':158 'span':62 'spec':181 'specif':140 'structur':218 'transact':5,19,37,147 'transaction history API' 'type':138 'unit':101 'usd':108 'usdc':14,28,90 'usdc-settlement' 'use':89 'util':71 'valid':127,199 'varieti':56 'via':39,81 'wallet':171 'well':155 'well-docu':154 'x':122 'x-payment':121 'x402':2,16,59,83,128,200 'x402 paid API' 'x402-gated':1,15 'x402-payable':58 'x402-payment'","prices":[{"id":"a7036e05-b19b-49b8-87eb-d7d9ae81e37f","listingId":"8a5c9cdf-d2ff-4e27-92a6-131f5a663f71","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/69/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":"2026-04-18T18:53:22.412Z"}],"sources":[{"listingId":"8a5c9cdf-d2ff-4e27-92a6-131f5a663f71","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/69/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:22.412Z","lastSeenAt":"2026-04-27T17:05:04.908Z"}],"details":{"listingId":"8a5c9cdf-d2ff-4e27-92a6-131f5a663f71","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/69/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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","source_url":"https://lowpaymentfee.com/api/v1/portfolios/69/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 network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/69/transactions"}],"useCases":["Retrieving transaction records for a specific portfolio","Integrating portfolio transaction data into dashboards or analytics tools","Agent-driven portfolio monitoring with per-call payment"],"bestFor":["Developers wanting keyless, pay-per-use portfolio transaction data","AI agents that can settle x402 payments on Base","Users who prefer no-subscription, no-rate-limit API access"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.544Z"},"updatedAt":"2026-04-27T17:05:04.908Z"}}