{"id":"542dcbd2-00cf-4f79-a30f-63276aed1f13","shortId":"d7f8Hs","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 83. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance, and infrastructure categories, all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint is live and responds with a 402 Payment Required challenge conforming to x402 version 1. It accepts POST requests and requires an X-PAYMENT header containing a valid payment proof. The maximum amount required per call is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 USD (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains. The specific endpoint path suggests it returns performance metrics for a particular portfolio (ID 83), but the exact data shape is unknown. The platform advertises no API keys, no rate limits, and instant access as features.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-performance","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","x402 finance","micropayment API","USDC API"],"warnings":["No API documentation available — docs, pricing, and README pages all render only a 'Connect wallet' prompt with no content.","No request or response schema provided; the shape of the returned portfolio performance data is unknown.","Endpoint is specific to portfolio ID 83 with no explanation of what this portfolio represents or whether other IDs are available.","Platform lists many API categories (AI, analytics, finance, infrastructure) but this specific endpoint's capabilities are unverified beyond the 402 challenge."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/83/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/83/performance","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. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the specific data returned by this portfolio performance endpoint is entirely undocumented. The endpoint is also scoped to a single hardcoded portfolio ID (83) with no explanation of what that portfolio 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'0.02':10,23,123 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':118 '1':88 '20':112 '300':140 '402':80 '6':127 '83':38,198 'USDC API' 'accept':90 'access':217 'across':52 'address':134 'advertis':208 'ai/ml':55 'amount':107 'analyt':54 'api':51,149,210 'base':8,21,68,114,120 'base-network' 'broader':44 'call':110 'categori':59 'challeng':83 'conform':84 'connect':158 'contain':100,183 'content':164 'crawl':147 'data':3,16,34,53,202 'decim':128 'descript':175 'doc':148 'document':142 'endpoint':28,73,186 'equal':122 'exact':201 'exampl':172 'extrem':144 'featur':219 'field':178 'financ':56 'financial data API' 'header':99 'id':37,197 'infrastructur':58 'instant':216 'investment performance' 'key':211 'limit':214 'live':75 'lowpaymentfee.com':30 'maximum':106 'metric':192 'micropay':6,19 'micropayment API' 'network':9,22,69 'no-api-key' 'offer':46 'openapi':168 'page':153 'part':41 'particular':195 'path':187 'pay':48 'pay-per-request':47 'payment':81,98,103,130 'per':49,109 'perform':2,15,33,181,191 'platform':45,207 'portfolio':1,14,32,36,180,196 'portfolio analytics' 'portfolio returns' 'portfolio-performance' 'post':91 'price':150 'prompt':160 'proof':104 'protocol':65 'rate':213 'readm':152 'request':50,92 'request/response':171 'requir':82,94,108 'respond':77 'respons':182 'return':31,155,190 'schema':169 'second':141 'sent':132 'settl':61 'shape':203 'spars':145 'specif':185 'suggest':188 'timeout':138 'unit':115 'unknown':205 'usd':124 'usdc':13,26,71,117,125 'usdc-settlement' 'use':70,126 'valid':102 'version':87 'via':4,17,62 'wallet':159 'x':97 'x-payment':96 'x402':5,18,64,86 'x402 finance' 'x402-payment'","prices":[{"id":"0fe12eba-a2c6-43ba-852a-10c50a152080","listingId":"542dcbd2-00cf-4f79-a30f-63276aed1f13","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/83/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":"2026-04-18T18:53:25.457Z"}],"sources":[{"listingId":"542dcbd2-00cf-4f79-a30f-63276aed1f13","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/83/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:25.457Z","lastSeenAt":"2026-04-27T17:05:05.015Z"}],"details":{"listingId":"542dcbd2-00cf-4f79-a30f-63276aed1f13","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/83/performance \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","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 x402 version 1, requiring USDC payment of 20,000 base units ($0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/83/performance"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/83/performance"}],"useCases":["Retrieving performance data for a specific investment portfolio","Integrating portfolio metrics into dashboards or reporting tools","Agent-driven portfolio monitoring with per-request micropayments"],"bestFor":["Agents needing on-demand portfolio performance data without API key management","Pay-as-you-go access to financial portfolio metrics","Low-cost single-request financial data retrieval"],"notFor":["Bulk or high-frequency portfolio data ingestion (no documented batch endpoints)","Users who need detailed API documentation or response schema guarantees before integrating","Accessing arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 83)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.415Z"},"updatedAt":"2026-04-27T17:05:05.015Z"}}