{"id":"4a7747b5-dc5d-4407-b95a-fc325b49edc6","shortId":"GCPULZ","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/47/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, no rate limits, and no commitments required.\n\nPayment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge advertises a `maxAmountRequired` of 20000 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, detailed documentation, or example request/response bodies were found during crawling — the docs, pricing, API, 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 (47), it is unclear whether the endpoint is meant to be used generically or is specific to a single portfolio. The lack of input/output schema documentation makes it difficult to determine what fields the POST body should contain or what the response looks like. Agents should treat this as a stub-level listing until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-call","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 finance endpoint","USDC pay-per-call API","Base network API","lowpaymentfee","crypto portfolio data","transaction history API"],"warnings":["No OpenAPI or input/output schema available — request body format is unknown","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no content","Endpoint path contains a hardcoded portfolio ID (47); unclear if this generalizes","No example responses available to verify what data is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/47/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/47/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 (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt. The hardcoded portfolio ID and absent input/output schemas make practical use highly 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'/request':14,28 '0.02':13,27,68,108 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20000':100 '300':120 '47':164 '6':105 'Base network API' 'USDC pay-per-call API' 'access':37 'advertis':96 'agent':208 'ai/ml':58 'analyt':57 'api':64,73,139 'base':9,23,87,101 'base-network' 'bodi':131,199 'broader':53 'call':4,18,110 'challeng':95 'commit':80 'connect':147 'contain':201 'content':153 'contract':91 'crawl':135 'crypto portfolio data' 'data':41,56 'decim':106 'detail':126 'determin':194 'difficult':192 'doc':137 'document':127,189,220 'enabl':32 'endpoint':7,21,33,112,157,170 'equal':107 'exact':115 'exampl':129 'field':196 'finance/web3':60 'found':133 'generic':176 'hardcod':161 'id':163 'infer':59 'infrastructur':62 'input/output':187 'key':74 'lack':185 'level':216 'like':207 'limit':77 'list':217 'look':206 'lowpaymentfee' 'lowpaymentfee.com':35 'make':190 'maxamountrequir':98 'meant':172 'network':88 'no-api-key' 'offer':55 'openapi':124 'page':142 'part':50 'path':158 'pay':2,16 'pay-per-cal':1,15 'pay-per-call' 'payment':82,116 'per':3,17,69,109 'platform':54 'portfolio':5,19,39,162,183 'portfolio transactions API' 'portfolio-transactions' 'post':44,198 'price':66,138 'prompt':149 'provid':36 'rate':76 'readm':141 'refer':159 'request':45,70 'request/response':130 'requir':81 'respons':205 'return':144 'schema':125,188 'scheme':117 'second':121 'settl':84 'singl':182 'specif':156,179 'stub':215 'stub-level':214 'substant':152 'surfac':221 'timeout':122 'transact':6,20,40 'transaction history API' 'treat':210 'unclear':167 'unit':102 'usdc':12,26,90 'usdc-settlement' 'use':89,113,175 'util':63 'via':10,24,42 'wallet':148 'whether':168 'x402':11,25,31,94 'x402 finance endpoint' 'x402-enabled':30 'x402-payment'","prices":[{"id":"fccfe6bf-8b49-4f50-aa5b-f7e708335710","listingId":"4a7747b5-dc5d-4407-b95a-fc325b49edc6","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/47/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":"2026-04-18T18:52:51.273Z"}],"sources":[{"listingId":"4a7747b5-dc5d-4407-b95a-fc325b49edc6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/47/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:51.273Z","lastSeenAt":"2026-04-27T22:33:21.087Z"}],"details":{"listingId":"4a7747b5-dc5d-4407-b95a-fc325b49edc6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/47/transactions \\\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 x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network with exact scheme and 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/portfolios/47/transactions"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/47/transactions"}],"useCases":["Fetching transaction records for a specific portfolio","Integrating portfolio transaction data into dashboards or analytics pipelines","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Developers wanting keyless, pay-per-use portfolio transaction access","AI agents that can settle x402 payments on Base","Prototyping financial data integrations without subscription commitments"],"notFor":["Production use requiring documented request/response schemas","Bulk historical transaction exports (no batch endpoint documented)","Users who cannot settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.973Z"},"updatedAt":"2026-04-27T22:33:21.087Z"}}