{"id":"28ddffda-d0d1-4061-8c67-313af36578a5","shortId":"m5HKzr","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 provides portfolio performance data for a specific portfolio (ID 13) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request. This particular endpoint falls under the finance category and appears to return performance metrics for a portfolio. No API keys or rate limits are advertised; access is granted purely through the x402 payment protocol.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. 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 is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to know what data to send or expect back.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","micropayment","pay-per-request","json-api"],"categories":["finance","data"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial performance API","x402 finance endpoint","portfolio tracking"],"warnings":["No API documentation available — docs, pricing, and README pages are all empty","No request body schema or response schema provided; input/output format is unknown","Portfolio ID 13 is hardcoded in the URL; unclear if other portfolio IDs are accessible","Provider site appears to be a generic x402 API storefront with many endpoints but no substantive docs for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/13/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/13/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of the endpoint can only be inferred from the URL 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'0.02':10,23,76,107 '000':71 '0x8335':63 '13':40 '20':70 '2913':64 '402':200 '6':81 'accept':47,191 'access':135 'advertis':134 'ai/ml':98 'analyt':97 'api':94,128,150 'appear':119 'back':218 'base':8,21,58,72 'behind':41 'bodi':190 'broad':88 'catalog':89 'categori':117 'challeng':201 'confirm':195 'connect':159 'contain':184 'content':165 'contract':62 'cost':68 'data':3,16,34,96,213 'decim':82 'descript':176 'difficult':209 'doc':149 'document':144,206 'endpoint':28,46,112,193 'equal':75 'exampl':173 'expect':217 'extrem':146 'fall':113 'field':179 'financ':116 'finance/web3':100 'financial performance API' 'gate':93 'grant':137 'host':86 'id':39 'infer':99 'infrastructur':102 'investment performance' 'json':52 'json-api' 'key':129 'know':211 'lack':204 'limit':132 'live':196 'lowpaymentfee.com':30,85 'make':207 'maximum':67 'metric':123 'micropay':6,19 'micropayment' 'network':9,22,59 'openapi':169 'page':154 'paramet':187 'particular':111 'pay-per-request' 'payment':53,142 'paywal':44 'per':77,108 'perform':2,15,33,122,182 'portfolio':1,14,32,38,126,181 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':48,189 'price':105,151 'prompt':161 'protocol':143 'provid':31,84 'pure':138 'rate':131 'readm':153 'request':49,78,109 'request/response':172 'respons':183 'return':51,121,156,197 'schema':170 'send':215 'settl':55 'span':95 'spars':147 'specif':37 'substant':164 'unit':73 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'util':103 'valid':199 'via':4,17 'wallet':160 'x402':5,18,43,92,141 'x402 finance endpoint' 'x402-gated':91 'x402-payment'","prices":[{"id":"ccdfb117-3f83-441d-b3ea-f528fffad069","listingId":"28ddffda-d0d1-4061-8c67-313af36578a5","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/13/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":"2026-04-18T18:52:17.036Z"}],"sources":[{"listingId":"28ddffda-d0d1-4061-8c67-313af36578a5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/13/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:17.036Z","lastSeenAt":"2026-04-28T06:34:17.279Z"}],"details":{"listingId":"28ddffda-d0d1-4061-8c67-313af36578a5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/13/performance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/portfolios/13/performance"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/13/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or agent workflows","Programmatic access to portfolio returns without API key management"],"bestFor":["Agents or apps that need on-demand portfolio performance data with no subscription","Developers experimenting with x402 micropayment-gated APIs","Crypto-native workflows already operating on Base network"],"notFor":["Users who need detailed API documentation or schema before integrating","Bulk historical portfolio data retrieval (no evidence of batch support)","Non-crypto users unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.713Z"},"updatedAt":"2026-04-28T06:34:17.279Z"}}