{"id":"502984bd-dc22-47da-85cc-7d2a14f2293e","shortId":"tQdXLY","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 provides portfolio performance data for a specific portfolio (ID 86) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe provider site lowpaymentfee.com hosts a broad collection of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced uniformly at $0.02 per call. This particular endpoint falls under the finance category. No API keys are required; access is granted instantly upon payment via the x402 protocol. The site advertises no rate limits and no minimum commitments.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what request body the POST expects or what shape the performance response takes. Use with caution until more documentation surfaces.","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","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema for request or response bodies","The endpoint path references a hardcoded portfolio ID (86); unclear if other portfolio IDs are available or how to discover them","No examples of request payloads or response shapes exist in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/86/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/86/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 and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The specific purpose of 'portfolio 86 performance' is opaque without further 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'000':70 '0x8335':60 '20':69 '2913':61 '402':181 '6':74 '86':38 'accept':44 'access':118 'addit':158 'advertis':130 'ai/ml':92 'analyt':91 'api':88,114,144 'avail':173 'base':8,20,55,71 'behind':39 'bodi':191 'broad':82 'call':104 'categori':112 'caution':204 'challeng':182 'collect':83 'commit':137 'connect':153 'contract':59 'cost':64 'data':3,15,32,90 'decim':75 'detail':160 'doc':143 'document':138,185,207 'endpoint':26,107,175 'exampl':171 'expect':194 'extrem':140 'fall':108 'financ':111 'finance/web3':94 'gate':87 'grant':120 'host':80 'id':37 'infer':93 'infrastructur':96 'instant':121 'investment performance' 'json':49 'json-api' 'key':115 'limit':133 'live':177 'lowpaymentfee' 'lowpaymentfee.com':28,79 'micropay':6,18 'micropayment' 'minimum':136 'network':9,21,56 'no-api-key' 'openapi':164 'page':148 'particular':106 'pay-per-call portfolio data' 'payload':172 'payment':50,123 'paywal':42 'per':11,23,67,103 'perform':2,14,31,199 'portfolio':1,13,30,36 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':45,193 'price':99,145 'prompt':155 'protocol':127 'provid':29,77 'rate':132 'readm':147 'render':150 'request':12,24,46,68,190 'request/response':167 'requir':117 'respons':200 'return':48,178 'schema':168 'settl':52 'shape':197 'site':78,129 'span':89 'spars':141 'spec':165 'specif':35 'surfac':208 'take':201 'technic':159 'unclear':188 'uniform':100 'unit':72 'upon':122 'usdc':58 'usdc-base-network' 'use':57,202 'util':97 'valid':180 'via':4,16,124 'wallet':154 'without':184 'x402':5,17,41,86,126 'x402 finance API' 'x402-gated':85 'x402-payment'","prices":[{"id":"bf8846aa-d2fb-4241-8cf3-40feebad04b7","listingId":"502984bd-dc22-47da-85cc-7d2a14f2293e","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/86/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":"2026-04-18T18:53:32.046Z"}],"sources":[{"listingId":"502984bd-dc22-47da-85cc-7d2a14f2293e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/86/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:32.046Z","lastSeenAt":"2026-04-27T22:33:22.784Z"}],"details":{"listingId":"502984bd-dc22-47da-85cc-7d2a14f2293e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/86/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 HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/portfolios/86/performance"},{"claim":"Payment is 20,000 base units of USDC (6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/86/performance"},{"claim":"Site advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or analytics tools","Agent-driven portfolio monitoring with per-request micropayments"],"bestFor":["Developers needing on-demand portfolio performance data without subscription commitments","AI agents that can settle x402 payments on Base network","Low-volume or sporadic portfolio data lookups at $0.02 per call"],"notFor":["High-frequency bulk data retrieval where per-request costs add up","Users who need detailed API documentation or request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.139Z"},"updatedAt":"2026-04-27T22:33:22.784Z"}}