{"id":"db568242-6e31-4311-8a42-1a5690a54674","shortId":"ENrd2Q","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/88/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-gated endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints on the platform use the x402 payment protocol on the Base network, settling in USDC.\n\nThe specific endpoint probed (`/api/v1/portfolios/88/transactions`) returns a valid x402 challenge with a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. This is consistent with the platform's advertised flat pricing of $0.02 per request across all endpoints. The platform advertises no API keys, no rate limits, and instant access — payment is the only authentication mechanism.\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 the portfolio transactions endpoint actually accepts or returns. The endpoint's `outputSchema` indicates it expects an HTTP POST request, but no input or output field definitions are provided. Without documentation, the actual functionality of this endpoint is unclear — it could involve creating, listing, or managing transactions within a portfolio, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","post-endpoint","portfolio-transactions","per-call-pricing"],"categories":["finance"],"synonyms":["portfolio transactions API","x402 finance endpoint","USDC pay-per-call API","lowpaymentfee portfolio","crypto portfolio transactions","Base network API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or input/output schema provided for this endpoint","The actual functionality of /api/v1/portfolios/88/transactions is unknown — the description 'Premium API Access' is generic","The portfolio ID '88' is hardcoded in the URL; unclear if other portfolio IDs are supported"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/88/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/88/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 with clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and no description of what the portfolio transactions endpoint actually does. This is effectively a stub 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'0.02':112,126 '000':103 '20':102 '6':108 'Base network API' 'USDC pay-per-call API' 'accept':190 'access':143 'across':129 'actual':189,216 'advertis':122,134 'ai/ml':63 'amount':100 'analyt':62 'api':38,136,156 'authent':148 'base':8,22,37,82,104 'base-network' 'broader':49 'call':12,26 'challeng':96 'connect':165 'consist':117 'content':171 'could':224 'creat':226 'crypto portfolio transactions' 'data':61,66 'decim':109 'definit':210 'descript':182 'doc':155 'document':150,214 'dozen':54 'endpoint':6,20,30,59,71,89,131,188,194,220 'equal':111 'exampl':179 'expect':199 'expos':33 'extrem':152 'field':209 'finance/web3':65 'flat':123 'function':217 'gate':3,17,58 'http':201 'indic':197 'infer':64 'infrastructur':68 'input':206 'instant':142 'involv':225 'key':137 'limit':140 'list':227 'lowpaymentfee portfolio' 'lowpaymentfee.com':32,51 'manag':229 'maximum':99 'mechan':149 'network':83 'offer':53 'openapi':175 'output':208 'outputschema':196 'page':160 'paid':9,23 'part':46 'payment':78,144 'per':11,25,113,127 'per-cal':10,24 'per-call-pricing' 'platform':50,74,120,133 'portfolio':4,18,40,186,233 'portfolio transactions API' 'portfolio-transactions' 'post':36,202 'post-bas':35 'post-endpoint' 'price':124,157 'probe':90 'prompt':167 'protocol':79 'provid':212 'rate':139 'readm':159 'render':162 'request':114,128,203 'request/response':178 'return':92,192 'schema':176 'settl':84 'span':60 'spars':153 'specif':88 'specul':237 'transact':5,19,41,187,230 'unclear':222 'unit':105 'usdc':14,28,86,107 'usdc-settlement' 'use':75 'util':69 'valid':94 'wallet':166 'within':231 'without':213 'x402':2,16,57,77,95 'x402 finance endpoint' 'x402-gated':1,15,56 'x402-payment'","prices":[{"id":"cae9d387-095f-42fb-b2cb-a3630ccf715f","listingId":"db568242-6e31-4311-8a42-1a5690a54674","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/88/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":"2026-04-18T18:53:42.296Z"}],"sources":[{"listingId":"db568242-6e31-4311-8a42-1a5690a54674","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/88/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:42.296Z","lastSeenAt":"2026-04-27T22:33:23.224Z"}],"details":{"listingId":"db568242-6e31-4311-8a42-1a5690a54674","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/88/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/88/transactions"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Submitting or recording transactions against a portfolio via a pay-per-call model","Integrating portfolio transaction data into automated trading or accounting workflows","Agent-driven portfolio management where each API call is settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-request portfolio transaction access","AI agents that can settle x402 payments on Base in USDC","Prototyping financial workflows without subscription commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where $0.02 per request adds up significantly","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.542Z"},"updatedAt":"2026-04-27T22:33:23.224Z"}}