{"id":"7f18134d-8bff-448c-be34-f50fbac012a7","shortId":"bJCMKk","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 portfolio ID 18. It is part of a broader platform offering various pay-per-call APIs across data analytics, AI/ML, finance, and infrastructure categories. The endpoint uses the x402 payment protocol, settling in USDC on the Base network. Each request costs $0.02 (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each POST request.\n\nThe specific endpoint `/api/v1/portfolios/18/performance` is not listed on the provider's landing page among the advertised API categories, which focus on analytics, AI, finance, and utility endpoints. This suggests it may be a specialized or less-documented route. The response MIME type is `application/json`. No request body schema or response schema documentation was found beyond the x402 challenge metadata. The platform's docs, pricing, and API pages all returned minimal content (just a \"Connect wallet\" prompt), so detailed usage instructions are unavailable.\n\nThe endpoint is confirmed live — it returns a proper x402 challenge (HTTP 402) with version 1 of the protocol, accepting exact-scheme payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maximum timeout for payment settlement is 300 seconds.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-performance","pay-per-request","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance data","portfolio returns","x402 finance API","micropayment API","Base USDC API","pay-per-call portfolio"],"warnings":["No request body schema or response schema documented anywhere","The specific endpoint /api/v1/portfolios/18/performance is not listed among the provider's advertised APIs on the landing page","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no actual content","Unknown what data 'portfolio 18 performance' returns — no sample response available","Cannot confirm whether other portfolio IDs are valid"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/18/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/18/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 challenge, but there is no documentation for request parameters, response schema, or what 'portfolio 18 performance' actually contains. The docs/pricing/API pages are all empty beyond a wallet-connect prompt. This is effectively a stub listing with confirmed 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'0.02':10,22,76 '000':78 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':215 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':218 '1':204 '18':36 '20':77 '300':228 '402':201 '6':84 'Base USDC API' 'accept':208 'across':51 'address':214 'advertis':121 'ai':128 'ai/ml':54 'among':119 'analyt':53,127 'api':50,87,122,172 'application/json':150 'attach':97 'base':8,20,71,79,220 'beyond':161 'bodi':153 'broader':42 'call':49 'caller':95 'categori':58,123 'challeng':164,199 'confirm':192 'connect':180 'content':177 'cost':75 'data':3,15,32,52 'decim':85 'detail':184 'doc':169 'document':143,158 'endpoint':26,60,108,132,190 'exact':210 'exact-schem':209 'financ':55,129 'focus':125 'found':160 'header':101 'http':200 'id':35 'infrastructur':57 'instruct':186 'investment performance data' 'json-response' 'key':88 'land':117 'less':142 'less-docu':141 'limit':90 'list':112 'live':193 'lowpaymentfee.com':28 'maximum':222 'may':136 'metadata':165 'micropay':6,18 'micropayment API' 'mime':147 'minim':176 'network':9,21,72 'no-api-key' 'offer':44 'page':118,173 'part':39 'pay':47 'pay-per-cal':46 'pay-per-call portfolio' 'pay-per-request' 'payment':64,100,212,225 'per':11,23,48 'perform':2,14,31 'platform':43,167 'portfolio':1,13,30,34 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':104 'price':170 'prompt':182 'proper':197 'protocol':65,207 'provid':115 'rate':89 'request':12,24,74,105,152 'requir':94 'respons':146,156 'return':29,175,195 'rout':144 'schema':154,157 'scheme':211 'second':229 'settl':66 'settlement':226 'simpli':96 'special':139 'specif':107 'subscript':92 'suggest':134 'timeout':223 'type':148 'unavail':188 'unit':80 'usag':185 'usdc':68,82,217 'usdc-base' 'use':61,216 'util':131 'various':45 'version':203 'via':4,16 'wallet':181 'x402':5,17,63,99,163,198 'x402 finance API' 'x402-payment'","prices":[{"id":"c33e59d6-a036-4180-9ab2-88e63f48b9b0","listingId":"7f18134d-8bff-448c-be34-f50fbac012a7","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/18/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":"2026-04-18T18:52:12.840Z"}],"sources":[{"listingId":"7f18134d-8bff-448c-be34-f50fbac012a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/18/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:12.840Z","lastSeenAt":"2026-04-28T07:34:37.639Z"}],"details":{"listingId":"7f18134d-8bff-448c-be34-f50fbac012a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/18/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 a valid x402 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/18/performance"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/18/performance"},{"claim":"Docs, pricing, API, and README pages all show only a 'Connect wallet' prompt","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-call micropayments","Automated financial reporting pipelines"],"bestFor":["Agents or apps needing on-demand portfolio performance data without subscriptions","Developers experimenting with x402 micropayment-gated APIs","Low-volume consumers who prefer pay-per-request over monthly plans"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-frequency bulk data consumers who need negotiated pricing or rate guarantees","Anyone requiring portfolio IDs other than 18 (no evidence other IDs are supported at this path)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.874Z"},"updatedAt":"2026-04-28T07:34:37.639Z"}}