{"id":"d7ef4625-cb7a-4cea-8e9d-b7df9c536d53","shortId":"A2eCXd","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 a specific portfolio (ID 45) behind an x402 paywall. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure APIs — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the payment details (asset, amount, recipient address), construct an on-chain USDC payment on Base, and include the payment proof in the X-PAYMENT header on a subsequent request. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys, rate limits, or upfront commitments are needed.\n\nThe specific data returned by this holdings endpoint is not documented in detail — the platform's docs, pricing, and README pages all render only a wallet-connect prompt with no additional content. The endpoint path suggests it returns the current holdings of portfolio #45, likely including asset names, quantities, and possibly valuations, but this is inferred from the URL structure alone. The platform advertises itself under a \"Finance & Web3\" category with price feeds, exchange rates, token quotes, and gas estimates as sibling endpoints.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","micropayment","pay-per-request","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","asset allocation API","x402 finance API","crypto portfolio","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, and README pages only show a wallet-connect prompt with no content.","No request or response schema is published; the shape of the holdings data is unknown.","Portfolio ID 45 is hardcoded in the path; it is unclear whether other portfolio IDs are available or what they represent.","The platform lists many endpoint categories but this specific endpoint (/portfolios/45/holdings) is not listed on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/45/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/45/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no response examples, no request body documentation, and the docs/pricing/README pages are all empty wallet-connect stubs. The actual data returned is entirely 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'payment':81,95,107,113,119 'paywal':42 'per':11,23,63 'platform':49,165,214 'portfolio':1,13,30,36,194 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'possibl':202 'post':76 'price':60,168,223 'prompt':179 'proof':114 'protocol':87 'quantiti':200 'quot':228 'rate':144,226 'readm':170 'receiv':89 'recipi':99 'render':173 'request':12,24,64,77,124 'requir':128 'return':29,79,154,189 'settl':66 'sibl':233 'specif':35,152 'structur':211 'subsequ':123 'suggest':187 'token':227 'unit':133 'upfront':147 'url':210 'usdc':68,106,135 'usdc-base' 'valuat':203 'via':4,16,84 'wallet':177 'wallet-connect':176 'web3':220 'x':118 'x-payment':117 'x402':5,17,41,86 'x402 finance API' 'x402-payment'","prices":[{"id":"b5f061c2-af1b-4e1d-8b67-ab8af9d89912","listingId":"d7ef4625-cb7a-4cea-8e9d-b7df9c536d53","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/45/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:00.802Z"}],"sources":[{"listingId":"d7ef4625-cb7a-4cea-8e9d-b7df9c536d53","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/45/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:00.802Z","lastSeenAt":"2026-04-27T21:34:09.957Z"}],"details":{"listingId":"d7ef4625-cb7a-4cea-8e9d-b7df9c536d53","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/45/holdings \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/45/holdings"},{"claim":"The platform prices all APIs at $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 USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/45/holdings"}],"useCases":["Retrieving current holdings for a tracked portfolio","Building portfolio dashboards that pull live holding data","Automated agents querying portfolio composition without API key management","On-demand portfolio snapshots paid per request via USDC"],"bestFor":["Agents or apps that need pay-per-call portfolio data without subscriptions","Developers experimenting with x402 micropayment protocols","Lightweight integrations that want no-auth, no-rate-limit access to financial data"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","High-frequency bulk data retrieval where per-request pricing adds up","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.6Z"},"updatedAt":"2026-04-27T21:34:09.957Z"}}