{"id":"e8af70cc-39dc-49d7-b1a6-28cfe1b949d0","shortId":"wkRQeV","kind":"x402","title":"Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).","tagline":"Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/45/transactions`. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request with no API keys, rate limits, or commitments required.\n\nPayment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge specifies a `maxAmountRequired` of 20,000 base units, which at 6 decimals equals $0.02 per call. The endpoint uses the \"exact\" payment scheme with a 300-second timeout. No OpenAPI schema or detailed documentation was found beyond the landing page; the docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause this specific endpoint path references a hardcoded portfolio ID (45), it is unclear whether the ID is parameterizable or if this is a fixed demo resource. The platform's actual data sources and response formats are undocumented, so callers should expect to experiment. The endpoint is confirmed live (402 challenge returned successfully).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 finance endpoint","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto portfolio data"],"warnings":["No OpenAPI schema or request/response documentation available","Docs, pricing, and README pages contain no substantive content (only 'Connect wallet')","Endpoint path contains hardcoded portfolio ID (45) — unclear if parameterizable","Actual data source and response format are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/45/transactions","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/45/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation of request/response formats, and no examples. The docs/pricing/README pages are all blank beyond a wallet-connect prompt. The specific endpoint path with a hardcoded portfolio ID raises questions about parameterization. Effectively a stub 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'/request':14,28 '0.02':13,27,68,107 '000':99 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':90 '20':98 '300':119 '402':200 '45':161 '6':104 'Base network API' 'USDC micropayment API' 'access':37 'actual':181 'ai/ml':58 'analyt':57 'api':64,73 'base':9,23,85,100 'base-network' 'beyond':130 'broader':53 'call':4,18,109 'caller':190 'challeng':93,201 'commit':78 'confirm':198 'connect':144 'content':150 'contract':89 'crypto portfolio data' 'data':41,56,182 'decim':105 'demo':176 'detail':126 'doc':135 'document':127 'enabl':32 'endpoint':7,21,33,111,154,196 'equal':106 'exact':114 'expect':192 'experi':194 'finance/web3':60 'fix':175 'format':186 'found':129 'hardcod':158 'id':160,167 'infer':59 'infrastructur':62 'key':74 'land':132 'limit':76 'live':199 'lowpaymentfee' 'lowpaymentfee.com':35 'maxamountrequir':96 'network':86 'no-api-key' 'offer':55 'openapi':123 'page':133,139 'parameteriz':169 'part':50 'path':155 'pay':2,16 'pay-per-cal':1,15 'pay-per-call API' 'pay-per-request' 'payment':80,115 'per':3,17,69,108 'platform':54,179 'portfolio':5,19,39,159 'portfolio transactions API' 'portfolio-transactions' 'post':44 'price':66,136 'prompt':146 'provid':36 'rate':75 'readm':138 'refer':156 'request':45,70 'requir':79 'resourc':177 'respons':185 'return':141,202 'schema':124 'scheme':116 'second':120 'settl':82 'sourc':183 'specif':153 'specifi':94 'substant':149 'success':203 'timeout':121 'transact':6,20,40 'unclear':164 'undocu':188 'unit':101 'usdc':12,26,88 'usdc-settlement' 'use':87,112 'util':63 'via':10,24,42 'wallet':145 'whether':165 'x402':11,25,31,92 'x402 finance endpoint' 'x402-enabled':30 'x402-payment'","prices":[{"id":"e69c62ab-d9af-4fdb-b58b-8fc381bef8e2","listingId":"e8af70cc-39dc-49d7-b1a6-28cfe1b949d0","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/45/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:57.198Z"}],"sources":[{"listingId":"e8af70cc-39dc-49d7-b1a6-28cfe1b949d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/45/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:57.198Z","lastSeenAt":"2026-04-27T22:33:21.429Z"}],"details":{"listingId":"e8af70cc-39dc-49d7-b1a6-28cfe1b949d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/45/transactions \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/portfolios/45/transactions"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/45/transactions"}],"useCases":["Fetching portfolio transaction history without traditional API key registration","Programmatic access to financial transaction data with per-call USDC micropayments","Agent-driven portfolio monitoring workflows that settle payments on Base L2"],"bestFor":["Developers wanting zero-signup, pay-per-use portfolio data access","AI agents that can settle x402 payments autonomously on Base","Prototyping financial data integrations without subscription commitments"],"notFor":["Users needing well-documented, schema-validated API responses","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.725Z"},"updatedAt":"2026-04-27T22:33:21.429Z"}}