{"id":"7ccb6793-2419-4671-a276-437a3d59944c","shortId":"kRDxNp","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 exposes a POST-based transactions API for portfolio #53. It is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-gated endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all settled on the Base network using USDC.\n\nThe specific endpoint `/api/v1/portfolios/53/transactions` is gated via the x402 protocol. The 402 challenge indicates a maximum cost of $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02), paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The payment scheme is \"exact,\" meaning the caller pays the precise amount per call with no subscription or session model. No API keys are required; authentication and authorization are handled entirely through the x402 payment header.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. The endpoint's purpose — portfolio transactions — is inferred solely from the URL path; no request/response schema, field definitions, or usage examples are provided by the source. It is unclear whether this endpoint creates, retrieves, or manages transactions for a financial portfolio. The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, with no rate limits and instant access.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","portfolio-transactions","post-endpoint"],"categories":["finance","web3"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment API","Base network API","pay-per-call transactions","lowpaymentfee API","crypto payment gated endpoint"],"warnings":["No API documentation available — docs, pricing, README, and API pages all return only a wallet-connect prompt with no content.","No request or response schema provided; the purpose of the endpoint (create vs. read transactions, what fields are accepted) is unknown.","The endpoint targets a specific portfolio ID (53); it is unclear if other portfolio IDs are available or how they are obtained.","The platform appears to host many endpoints but none have published schemas or documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/53/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/53/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no request/response schema, no examples, and the purpose of the endpoint is only inferable from the URL path. This is effectively a stub 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'/request':223 '0.02':95,107,222 '000':99 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':111 '20':98 '402':88 '53':42 '6':105 'Base network API' 'USDC micropayment API' 'access':235 'across':226 'address':110 'ai/ml':62 'amount':125 'analyt':61 'api':39,135,157 'authent':139 'author':141 'base':8,22,37,73,100,113 'base-network' 'broader':48 'call':12,26,127 'caller':121 'challeng':89 'confirm':219 'connect':166 'content':172 'cost':93 'crawl':155 'creat':205 'crypto payment gated endpoint' 'data':60,65 'decim':106 'definit':190 'doc':156 'document':150 'dozen':53 'endpoint':6,20,30,58,79,174,204,228 'entir':144 'exact':118 'exampl':193 'expos':33 'extrem':152 'field':189 'finance/web3':64 'financi':212 'flat':221 'gate':3,17,57,82 'handl':143 'header':149 'indic':90 'infer':63,180 'infrastructur':67 'instant':234 'key':136 'land':217 'limit':232 'lowpaymentfee API' 'lowpaymentfee.com':32,50 'manag':208 'maximum':92 'mean':119 'model':133,225 'network':74 'offer':52 'page':161,218 'paid':108 'part':45 'path':185 'pay':10,24,122 'pay-per-cal':9,23 'pay-per-call transactions' 'payment':115,148 'per':11,25,96,126 'per-call-pricing' 'platform':49,215 'portfolio':4,18,41,177,213 'portfolio transactions API' 'portfolio-transactions' 'post':36 'post-bas':35 'post-endpoint' 'precis':124 'price':158,224 'prompt':168 'protocol':86 'provid':195 'purpos':176 'rate':231 'readm':160 'request':97 'request/response':187 'requir':138 'retriev':206 'return':163 'schema':188 'scheme':116 'session':132 'settl':70 'sole':181 'sourc':198 'span':59 'spars':153 'specif':78 'subscript':130 'transact':5,19,38,178,209 'unclear':201 'unit':101 'url':184 'usag':192 'usdc':14,28,76,103 'usdc-settlement' 'use':75 'util':68 'via':83 'wallet':167 'whether':202 'x402':2,16,56,85,147 'x402 paid API' 'x402-gated':1,15,55 'x402-payment'","prices":[{"id":"c92cc4f4-8d41-4cf8-ba70-bd1bd8eb6d19","listingId":"7ccb6793-2419-4671-a276-437a3d59944c","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/53/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":"2026-04-18T18:53:09.113Z"}],"sources":[{"listingId":"7ccb6793-2419-4671-a276-437a3d59944c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/53/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:09.113Z","lastSeenAt":"2026-04-23T02:31:37.789Z"}],"details":{"listingId":"7ccb6793-2419-4671-a276-437a3d59944c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/53/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 x402Version 1, scheme 'exact', network 'base', maxAmountRequired 20000, asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC).","source_url":"https://lowpaymentfee.com/api/v1/portfolios/53/transactions"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages return only a 'Connect wallet' prompt with no substantive documentation.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Submitting or retrieving transactions for a specific portfolio via a pay-per-call model","Integrating x402-gated financial data into agent workflows without API key management","Programmatic portfolio transaction access settled in USDC on Base"],"bestFor":["Developers building on Base who want frictionless pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer no-subscription, no-API-key access to financial endpoints"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integration","High-volume consumers who would benefit from bulk/subscription pricing","Anyone requiring non-USDC or non-Base settlement options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.147Z"},"updatedAt":"2026-04-23T02:31:37.789Z"}}