{"id":"edf5fb5a-d278-46ee-9b40-0aeadd39f2d0","shortId":"QvqpGE","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/91/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind the x402 payment protocol.\n\nThe specific endpoint probed here charges up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC on Base, where USDC has 6 decimals = $0.02). Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme. No API keys or rate limits are advertised; access is granted per-call upon valid payment. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse. The crawled docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the site. The endpoint is confirmed live (402 challenge returned), but the actual functionality behind the paywall — what fields the transaction data contains, what parameters the POST body expects — cannot be determined from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto payment API","transaction data endpoint"],"warnings":["No API documentation available — docs, pricing, and API pages all render only 'Connect wallet'","No OpenAPI or request/response schema provided; request body format and response structure are unknown","The endpoint path references a specific portfolio ID (91); it is unclear whether other portfolio IDs are supported or what this portfolio represents","The platform lists many API categories (AI, analytics, finance, etc.) but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/91/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/91/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual data returned behind the paywall is unknown, making this effectively a stub 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'0.02':88,106 '000':94 '0x8335':117 '20':93 '2913':118 '402':192 '6':104 'Base network API' 'USDC micropayment API' 'accept':143 'access':34,132 'actual':197 'advertis':131 'ai/ml':66 'analyt':65 'api':62,125,158 'application/json':148 'avail':183,219 'base':8,22,95,100,112 'base-network' 'behind':75,199 'bodi':212 'broader':50 'call':12,26,137 'cannot':214 'challeng':193 'charg':85 'confirm':190 'connect':164 'contain':207 'content':170 'contract':116 'crawl':154 'crypto payment API' 'data':38,64,69,206 'decim':105 'determin':216 'doc':155 'document':149 'endpoint':6,20,30,82,142,188 'exact':122 'exampl':182 'expect':213 'extrem':151 'field':203 'finance/web3':68 'function':198 'gate':3,17,74 'grant':134 'infer':67 'infrastructur':71 'key':126 'limit':129 'live':191 'lowpaymentfee' 'lowpaymentfee.com':32,52 'materi':220 'maxamountrequir':91 'network':113 'no-api-key' 'offer':54 'openapi':174 'page':159 'paramet':209 'part':47 'pay':10,24,59 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':58 'payment':78,107,140 'paywal':201 'per':11,25,60,89,136 'per-cal':135 'platform':51 'portfolio':4,18,36 'portfolio transactions API' 'portfolio-transactions' 'post':41,144,211 'post-endpoint' 'price':156 'probe':83 'prompt':166 'protocol':79 'provid':33 'rate':128 'render':161 'request':42,61,90,145 'request/response':177 'return':147,194 'schema':178 'scheme':123 'settl':109 'site':186 'span':63 'spars':152 'spec':175 'specif':81 'transact':5,19,37,205 'transaction data endpoint' 'unit':96 'upon':138 'usag':181 'usdc':14,28,98,102,115 'usdc-settlement' 'use':114 'util':72 'valid':139 'varieti':56 'via':39,119 'wallet':165 'x402':2,16,77,121 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"45cec9bc-88de-418a-a9e1-f65d1f14aec0","listingId":"edf5fb5a-d278-46ee-9b40-0aeadd39f2d0","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/91/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":"2026-04-18T18:53:45.291Z"}],"sources":[{"listingId":"edf5fb5a-d278-46ee-9b40-0aeadd39f2d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/91/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:45.291Z","lastSeenAt":"2026-04-27T12:34:56.529Z"}],"details":{"listingId":"edf5fb5a-d278-46ee-9b40-0aeadd39f2d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/91/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/91/transactions"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/91/transactions"},{"claim":"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":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction history for a specific portfolio","Programmatic access to portfolio transaction data without API key management","Agent-driven financial data retrieval with per-call USDC micropayments"],"bestFor":["Developers wanting keyless, pay-per-use portfolio transaction data","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or request/response schemas before purchasing","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":"2026-02-17T23:13:57.42Z"},"updatedAt":"2026-04-27T12:34:56.529Z"}}