{"id":"42be18af-237e-4c81-a7e9-efae6d506745","shortId":"P2ktGS","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 a specific portfolio (portfolio ID 3) behind an x402 paywall. It accepts POST requests and responds with 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 lowpaymentfee.com hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. This particular endpoint falls under the finance category and is discoverable via the x402 protocol. The x402 challenge was successfully captured, confirming the endpoint is live.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains or what parameters the POST body accepts. The endpoint path suggests it returns performance metrics for a pre-defined portfolio, but the exact schema is unknown.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","pay-per-request","json-response","no-api-key"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking","x402 finance endpoint"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no technical content","No request body schema or response schema documented; consumers must guess at the interface","Endpoint is hardcoded to portfolio ID 3; unclear if other portfolio IDs are available or what portfolio 3 represents","No OpenAPI or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/3/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/3/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 confirms pricing and payment details, but there is zero documentation on request parameters or response schema. No OpenAPI spec, no examples, and all doc pages return only a wallet-connect prompt. The endpoint is effectively a stub 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'000':72 '0x8335':62 '20':71 '2913':63 '3':39 '6':76 'accept':45,192 'addit':164 'ai/ml':94 'analyt':93 'api':90,109,150 'base':8,20,57,73 'behind':40 'bodi':191 'broad':83 'call':89 'captur':137 'catalog':84 'categori':124 'challeng':134 'commit':116 'confirm':138 'connect':159 'contain':185 'contract':61 'cost':66 'crawl':148 'data':3,15,32,92,97 'decim':77 'defin':205 'descript':177 'detail':166 'discover':127 'doc':149 'document':143 'endpoint':26,119,140,194 'exact':209 'exampl':174 'extrem':145 'fall':120 'field':180 'financ':123 'finance/web3':96 'financial data API' 'host':81 'id':38 'infer':95 'investment performance' 'json':51 'json-response' 'key':110 'limit':113 'live':142 'lowpaymentfee.com':28,80 'metric':200 'micropay':6,18 'network':9,21,58 'no-api-key' 'openapi':170 'page':154 'paramet':188 'particular':118 'path':195 'pay':87 'pay-per-cal':86 'pay-per-request' 'payment':52 'paywal':43 'per':11,23,69,88,105 'perform':2,14,31,183,199 'portfolio':1,13,30,36,37,182,206 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':46,190 'pre':204 'pre-defin':203 'price':102,151 'prompt':161 'protocol':131 'provid':79 'rate':112 'readm':153 'request':12,24,47,70,106 'request/response':173 'respond':49 'respons':184 'return':29,156,198 'schema':171,210 'servic':100 'settl':54 'span':91 'spars':146 'specif':35 'success':136 'suggest':196 'technic':165 'unit':74 'unknown':212 'usdc':60 'usdc-base-network' 'use':59 'util':99 'via':4,16,128 'wallet':160 'x402':5,17,42,130,133 'x402 finance endpoint' 'x402-payment'","prices":[{"id":"f840c426-01e1-4a36-b844-9c0bb4838f9b","listingId":"42be18af-237e-4c81-a7e9-efae6d506745","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/3/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":"2026-04-18T18:52:26.071Z"}],"sources":[{"listingId":"42be18af-237e-4c81-a7e9-efae6d506745","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/3/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:26.071Z","lastSeenAt":"2026-04-28T17:05:49.236Z"}],"details":{"listingId":"42be18af-237e-4c81-a7e9-efae6d506745","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/3/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":"The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/3/performance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/3/performance"},{"claim":"maxAmountRequired is 20000 base units (USDC 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/3/performance"},{"claim":"Provider advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving performance metrics for a tracked portfolio via micropayment","Integrating portfolio performance data into agent workflows without API key management","Paying per-call for financial data using USDC on Base"],"bestFor":["Agents needing on-demand portfolio performance data without subscriptions","Developers experimenting with x402 pay-per-call finance APIs","Low-volume consumers who want no-commitment access to portfolio analytics"],"notFor":["Users needing detailed API documentation or guaranteed schema stability","High-frequency trading systems requiring sub-second latency guarantees","Anyone who needs to query arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 3)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.265Z"},"updatedAt":"2026-04-28T17:05:49.236Z"}}