{"id":"ac8d72cd-507b-46ec-84a3-46a885567be8","shortId":"CsQ39H","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02/request.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02/request.","description":"This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 76) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted per-request via the x402 payment protocol.\n\nThe provider site (lowpaymentfee.com) hosts a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced uniformly at $0.02 per call. This specific endpoint falls under the finance category and appears to return performance metrics for a pre-defined portfolio. However, no detailed documentation, request schema, or response schema is available beyond the x402 challenge metadata. The docs, pricing, and API pages on the site require a wallet connection and provide no additional technical detail.\n\nBecause there is no OpenAPI spec, no example responses, and no documentation describing the request body or response fields, the exact data returned is unknown. Agents should expect a JSON response containing portfolio performance information, but the structure must be discovered empirically.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","micropayment","json-api","no-api-key"],"categories":["finance"],"synonyms":["portfolio performance API","investment performance","portfolio returns","x402 finance API","pay-per-call portfolio data","Base USDC API"],"warnings":["No API documentation available — docs page requires wallet connection and shows no content","No request body schema or response schema provided","Portfolio ID 76 is hardcoded in the path with no explanation of what it represents","No OpenAPI or machine-readable spec found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/76/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/76/performance","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation, and no example payloads. The endpoint path is specific to portfolio ID 76 with no explanation of what that portfolio contains. Effectively a stub 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'0.02':10,21,64,119 '000':68 '20':67 '6':72 '76':36 'Base USDC API' 'accept':43 'access':82 'addit':174 'agent':202 'ai/ml':109 'analyt':108 'api':75,105,162 'appear':131 'avail':152 'base':8,19,54,69 'behind':37 'beyond':153 'bodi':192 'broad':99 'call':121 'catalog':100 'categori':129 'challeng':156 'coin':59 'connect':170 'contain':208 'cost':62 'data':3,14,30,107,198 'decim':73 'defin':140 'describ':189 'detail':144,176 'discov':217 'doc':159 'document':145,188 'empir':218 'endpoint':24,42,124 'exact':197 'exampl':184 'expect':204 'fall':125 'field':195 'financ':128 'finance/web3':111 'gate':104 'grant':84 'host':97 'howev':142 'id':35 'infer':110 'inform':211 'infrastructur':113 'investment performance' 'json':48,206 'json-api' 'key':76 'limit':79 'lowpaymentfee.com':26,96 'metadata':157 'metric':135 'micropay':6,17 'micropayment' 'must':215 'network':9,20,55 'no-api-key' 'openapi':181 'page':163 'pay-per-call portfolio data' 'payment':49,91 'paywal':40 'per':65,86,120 'per-request':85 'perform':2,13,29,134,210 'portfolio':1,12,28,34,141,209 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':44 'pre':139 'pre-defin':138 'price':116,160 'protocol':92 'provid':27,94,172 'rate':78 'request':45,66,87,146,191 'requir':81,167 'respons':149,185,194,207 'return':47,133,199 'schema':147,150 'settl':51 'site':95,166 'span':106 'spec':182 'specif':33,123 'structur':214 'technic':175 'uniform':117 'unit':70 'unknown':201 'usd':58 'usdc':57 'usdc-base-network' 'use':56 'util':114 'via':4,15,88 'wallet':169 'x402':5,16,39,90,103,155 'x402 finance API' 'x402-gated':102 'x402-payment'","prices":[{"id":"4e780274-3a93-4f7d-9e94-a80b9a642705","listingId":"ac8d72cd-507b-46ec-84a3-46a885567be8","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/76/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":"2026-04-18T18:53:27.255Z"}],"sources":[{"listingId":"ac8d72cd-507b-46ec-84a3-46a885567be8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/76/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:27.255Z","lastSeenAt":"2026-04-27T22:33:22.629Z"}],"details":{"listingId":"ac8d72cd-507b-46ec-84a3-46a885567be8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/76/performance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC payment on Base network at 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/76/performance"},{"claim":"Site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/76/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio analytics into trading or reporting dashboards","Agent-driven portfolio monitoring with per-request micropayments"],"bestFor":["Agents needing on-demand portfolio performance data without API key management","Developers experimenting with x402 pay-per-call finance endpoints","Low-volume consumers who want no subscription commitment"],"notFor":["Users needing bulk or historical portfolio data across many portfolios","Anyone requiring detailed API documentation or guaranteed SLAs","Users who cannot transact USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.292Z"},"updatedAt":"2026-04-27T22:33:22.629Z"}}