{"id":"a8a46ce7-2784-4256-b2b1-ccab12aec1ef","shortId":"qcpS4Z","kind":"x402","title":"Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.","tagline":"Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 90. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories. The endpoint uses the x402 payment protocol, settling in USDC on the Base network at $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint `/api/v1/portfolios/90/holdings` accepts POST requests and returns JSON. Based on the URL structure, it likely returns a list of asset holdings (positions) within a particular portfolio. However, no detailed documentation, request schema, or response schema is available — the docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no further content. The platform advertises uniform $0.02 pricing across all its endpoints.\n\nThe endpoint is confirmed live: it returns a proper HTTP 402 x402 challenge with version 1, specifying the USDC asset contract (0x8335…) on Base, a payTo address, and a 300-second timeout. The platform root page loads successfully (HTTP 200) and lists this endpoint's parent domain among many other API categories.","tags":[],"capabilities":["portfolio-holdings","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","asset positions","portfolio data","x402 finance API","micropayment API","Base USDC API"],"warnings":["No request or response schema available — input/output formats are unknown","Documentation pages (/docs, /pricing, /README) contain no useful content beyond 'Connect wallet'","The specific portfolio ID 90 is hardcoded in the endpoint path; unclear if other portfolio IDs are available or what data this portfolio represents","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/90/holdings","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/90/holdings","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 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no request/response schema, no documentation beyond a landing page listing, and the specific purpose of portfolio 90 holdings is only inferable from the URL path. Docs pages return only 'Connect wallet' with no 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'pay-per-request':45 'payment':63,101,107 'payto':201 'per':11,23,47,74 'platform':43,167,209 'portfolio':1,13,30,34,136 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'posit':132 'post':114 'price':150,171 'prompt':161 'proof':108 'proper':184 'protocol':64 'rate':88 'readm':152 'request':12,24,48,115,141 'requir':94 'resolv':155 'respons':144 'return':29,117,126,182 'root':210 'schema':142,145 'second':206 'settl':65 'simpli':96 'specif':110 'specifi':192 'structur':123 'success':213 'timeout':207 'uniform':169 'unit':79 'upfront':91 'url':122 'usdc':67,81,194 'usdc-settlement' 'use':60 'valid':105 'version':190 'via':4,16 'wallet':160 'within':133 'x':100 'x-payment':99 'x402':5,17,62,106,187 'x402 finance API' 'x402-payment'","prices":[{"id":"5aa65469-956b-44ac-861a-4cf20d6d4bf5","listingId":"a8a46ce7-2784-4256-b2b1-ccab12aec1ef","amountUsd":null,"unit":"per_call","nativeCurrency":"USD 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Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:46.500Z"}],"sources":[{"listingId":"a8a46ce7-2784-4256-b2b1-ccab12aec1ef","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/90/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:46.500Z","lastSeenAt":"2026-04-27T12:34:56.577Z"}],"details":{"listingId":"a8a46ce7-2784-4256-b2b1-ccab12aec1ef","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/90/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: 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key management","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Agents or apps needing on-demand portfolio holdings data without subscription overhead","Developers experimenting with x402 micropayment-gated APIs","Low-frequency portfolio queries where pay-per-call is cheaper than a subscription"],"notFor":["High-frequency trading or bulk data ingestion where per-call costs add up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.365Z"},"updatedAt":"2026-04-27T12:34:56.577Z"}}