{"id":"3b5d822a-bfd4-4f72-a933-19e10b95a030","shortId":"QAuSZm","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 66) 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 data, and infrastructure utilities — all priced uniformly at $0.02 per call. No API keys or rate limits are advertised; access is granted instantly upon valid x402 payment. However, documentation is extremely thin: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available from the crawled material.\n\nBecause this specific endpoint path references \"portfolios/66/performance,\" it likely returns performance metrics (e.g., returns, time-series values) for a particular investment portfolio, but the exact response schema is unknown. The endpoint is confirmed live — it returns a proper 402 challenge with x402 version 1 headers. Agents should send a POST with an X-PAYMENT header containing a valid x402 payment proof to receive the data.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","json-api","micropayment","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment returns endpoint","x402 finance API","Base USDC micropayment API","portfolio analytics","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No request or response schema provided; the exact data returned is unknown","Only portfolio ID 66 is referenced; it is unclear whether other portfolio IDs are valid","The provider hosts many endpoints but none have documented schemas in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/66/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/66/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 402 challenge, but there is no OpenAPI spec, no request/response schema, no example payloads, and all documentation pages render only 'Connect wallet'. The purpose of the endpoint can only be inferred from the URL path. Pricing is clear at 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'0.02':10,23,76,109 '000':71 '0x8335':63 '1':213 '20':70 '2913':64 '402':208 '6':81 '66':40 'Base USDC micropayment API' 'accept':47 'access':120 'advertis':119 'agent':215 'ai/ml':98 'analyt':97 'api':94,113,135 'avail':164 'base':8,21,58,72 'behind':41 'broad':88 'call':111 'catalog':89 'challeng':209 'confirm':202 'connect':144 'contain':226 'contract':62 'cost':68 'crawl':167 'data':3,16,34,96,101,235 'decim':82 'detail':151 'doc':134 'document':129 'e.g':181 'endpoint':28,46,172,200 'equal':75 'exact':194 'exampl':162 'extrem':131 'finance/web3':100 'gate':93 'grant':122 'header':214,225 'host':86 'howev':128 'id':39 'infer':99 'infrastructur':103 'instant':123 'invest':190 'investment returns endpoint' 'json':52 'json-api' 'key':114 'like':177 'limit':117 'live':203 'lowpaymentfee' 'lowpaymentfee.com':30,85 'materi':168 'maximum':67 'metric':180 'micropay':6,19 'micropayment' 'network':9,22,59 'no-api-key' 'openapi':155 'page':139 'particular':189 'path':173 'payload':163 'payment':53,127,224,230 'paywal':44 'per':77,110 'perform':2,15,33,179 'portfolio':1,14,32,38,191 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'portfolios/66/performance':175 'post':48,219 'price':106,136 'prompt':146 'proof':231 'proper':207 'provid':31,84 'rate':116 'readm':138 'receiv':233 'refer':174 'render':141 'request':49,78 'request/response':158 'respons':195 'return':51,178,182,205 'schema':159,196 'send':217 'seri':185 'settl':55 'span':95 'spec':156 'specif':37,171 'technic':150 'thin':132 'time':184 'time-seri':183 'uniform':107 'unit':73 'unknown':198 'upon':124 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'util':104 'valid':125,228 'valu':186 'version':212 'via':4,17 'wallet':145 'x':223 'x-payment':222 'x402':5,18,43,92,126,211,229 'x402 finance API' 'x402-gated':91 'x402-payment'","prices":[{"id":"67f90897-e823-4605-bbd5-ff258c6a5c87","listingId":"3b5d822a-bfd4-4f72-a933-19e10b95a030","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/66/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":"2026-04-18T18:53:13.370Z"}],"sources":[{"listingId":"3b5d822a-bfd4-4f72-a933-19e10b95a030","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/66/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:13.370Z","lastSeenAt":"2026-04-27T20:08:58.571Z"}],"details":{"listingId":"3b5d822a-bfd4-4f72-a933-19e10b95a030","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/66/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":"Endpoint returns 402 with x402 version 1 challenge, maxAmountRequired 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/66/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 on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/66/performance"}],"useCases":["Retrieving performance metrics for a tracked investment portfolio","Integrating portfolio return data into dashboards or agent workflows","Paying per-request for financial data without subscription commitments"],"bestFor":["Agents needing on-demand portfolio performance data with no subscription","Developers building x402-native financial data pipelines on Base","Low-volume or sporadic access to portfolio analytics at $0.02/call"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need detailed API documentation or response schema before integrating","Accessing portfolios other than ID 66 (only this specific resource is confirmed)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.929Z"},"updatedAt":"2026-04-27T20:08:58.571Z"}}