{"id":"7a63785b-9180-4860-909b-8489772ed0c4","shortId":"XScaXs","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02 per request.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 32. It is part of a broader platform offering various 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 request (maxAmountRequired of 20,000 base units with USDC's 6 decimals = $0.02). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint `/api/v1/portfolios/32/performance` accepts POST requests and returns JSON. Based on the path structure, it likely returns performance metrics (e.g., returns, value over time) for a specific portfolio identified by ID 32. However, no detailed documentation of the request body schema or response fields is available — the docs, pricing, and API pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail.\n\nThe platform advertises a flat $0.02 per request across all endpoints, with no minimums, no commitments, and instant access. Payment is made via USDC (contract 0x8335...2913) on Base to address 0x1A2B...85F3, with a 300-second payment timeout. The x402 challenge was successfully captured, confirming the endpoint is live.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base","pay-per-request","json-api","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio returns","portfolio analytics","x402 finance API","micropayment portfolio data"],"warnings":["No request body schema or response schema documented anywhere","All documentation pages (docs, api, pricing, README) return only a 'Connect wallet' prompt with no technical content","It is unclear what portfolio ID 32 refers to or whether other portfolio IDs are accessible","No OpenAPI spec, ai-plugin manifest, or agents.txt available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/32/performance","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/32/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation of request body parameters, response schema, or what 'portfolio 32' actually represents. The docs/pricing/API pages all render only a 'Connect wallet' prompt with no technical content. This is effectively a stub listing with confirmed liveness but minimal usable 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'payment':64,103,109,196,214 'per':11,23,48,75,183 'perform':2,14,31,129 'platform':43,178 'portfolio':1,13,30,34,139 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':116 'price':160 'prompt':171 'proof':110 'protocol':65 'rate':93 'request':12,24,49,76,117,150,184 'requir':96 'resolv':165 'respons':154 'return':29,119,128,132 'schema':152 'second':213 'settl':66 'simpli':98 'specif':112,138 'structur':125 'success':220 'technic':175 'time':135 'timeout':215 'unit':82 'usdc':68,84,200 'usdc-base' 'use':61 'valid':107 'valu':133 'various':45 'via':4,16,199 'wallet':170 'x':102 'x-payment':101 'x402':5,17,63,108,217 'x402 finance API' 'x402-payment'","prices":[{"id":"a99566c2-b6c3-4495-be50-84a8aedda363","listingId":"7a63785b-9180-4860-909b-8489772ed0c4","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/32/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:46.490Z"}],"sources":[{"listingId":"7a63785b-9180-4860-909b-8489772ed0c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/32/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:46.490Z","lastSeenAt":"2026-04-27T22:33:20.863Z"}],"details":{"listingId":"7a63785b-9180-4860-909b-8489772ed0c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/32/performance \\\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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/32/performance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/32/performance"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Payment timeout is 300 seconds","source_url":"https://lowpaymentfee.com/api/v1/portfolios/32/performance"}],"useCases":["Retrieve performance data for a specific investment portfolio on demand","Integrate portfolio performance metrics into dashboards or agent workflows","Pay-per-call access to portfolio analytics without subscription commitments"],"bestFor":["Agents or apps needing on-demand portfolio performance data without API key management","Developers prototyping finance dashboards who want instant, low-cost access","x402-compatible clients on the Base network looking for cheap data endpoints"],"notFor":["Users needing detailed documentation or well-defined request/response schemas before integration","Bulk historical portfolio analysis requiring thousands of calls (costs add up at $0.02 each)","Non-crypto-native clients who cannot produce x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.283Z"},"updatedAt":"2026-04-27T22:33:20.863Z"}}