{"id":"cbb8087d-e45b-4f65-9b7f-27ed52c9c830","shortId":"ALGEt8","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 an x402 payment-gated POST request. The specific resource `/api/v1/portfolios/100/transactions` is part of a broader platform that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all settled on the Base network using USDC.\n\nThe x402 challenge confirms the endpoint is live and accepts exact-scheme payments in USDC (contract 0x8335…2913 on Base) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals). No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the transactions endpoint accepts or returns. The endpoint's purpose — whether it retrieves, creates, or manages portfolio transactions — must be inferred from the URL path alone. Prospective callers should expect to experiment or contact the provider for integration details.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key","post-method"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment API","Base network API","lowpaymentfee","pay-per-call finance API","crypto payment gated endpoint"],"warnings":["No OpenAPI or schema documentation available — request and response formats are entirely unknown","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no content","The specific purpose of /api/v1/portfolios/100/transactions (read vs. write, required fields) cannot be confirmed from available material","The portfolio ID '100' is hardcoded in the URL; it is unclear whether other portfolio IDs are supported"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/100/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/100/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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The actual functionality of this specific transactions endpoint is unknown beyond what the URL 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'/api/v1/portfolios/100/transactions':50 '/docs':154 '/pricing':156 '/readme':158 '0.02':110 '000':114 '0x8335':101 '20':113 '2913':102 '300':146 '6':118 'Base network API' 'USDC micropayment API' 'accept':93,188 'access':34 'advertis':127 'ai/ml':69 'alon':210 'analyt':68 'api':65,121 'attach':130 'base':8,22,80,104,115 'base-network' 'broader':55 'call':12,26 'caller':128,212 'challeng':86 'confirm':87 'connect':164 'contact':218 'content':170 'contract':100 'cost':108 'crawl':153 'creat':198 'crypto payment gated endpoint' 'data':38,67,72 'decim':119 'descript':181 'detail':223 'document':148 'dozen':59 'endpoint':6,20,30,89,187,192 'exact':95 'exact-schem':94 'exampl':178 'expect':214 'experi':216 'extrem':150 'field':184 'finance/web3':71 'gate':3,17,44 'header':135 'infer':70,205 'infrastructur':74 'integr':222 'key':122 'limit':125 'live':91 'lowpaymentfee' 'lowpaymentfee.com':32 'manag':200 'maximum':107 'must':203 'network':81 'no-api-key' 'offer':58 'openapi':174 'page':159 'part':52 'path':209 'pay':10,24,62 'pay-per-cal':9,23 'pay-per-call finance API' 'pay-per-request':61 'payment':43,97,134,140,143 'payment-g':42 'per':11,25,63,111 'platform':56 'portfolio':4,18,36,201 'portfolio transactions API' 'portfolio-transactions' 'post':45 'post-method' 'prompt':166 'proof':141 'prospect':211 'provid':33,220 'purpos':194 'rate':124 'request':46,64,112 'request/response':177 'resourc':49 'retriev':197 'return':161,190 'schema':175 'scheme':96 'second':147 'settl':77 'simpli':129 'span':66 'spars':151 'specif':48 'substant':169 'timeout':144 'transact':5,19,37,186,202 'unit':116 'url':208 'usdc':14,28,83,99 'usdc-settlement' 'use':82 'util':75 'valid':138 'via':39 'wallet':165 'whether':195 'x':133 'x-payment':132 'x402':2,16,41,85,139 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8bd138a3-3816-49d7-9ce7-05d9078d6152","listingId":"cbb8087d-e45b-4f65-9b7f-27ed52c9c830","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/100/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":"2026-04-18T18:52:21.881Z"}],"sources":[{"listingId":"cbb8087d-e45b-4f65-9b7f-27ed52c9c830","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/100/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:21.881Z","lastSeenAt":"2026-04-28T05:34:35.155Z"}],"details":{"listingId":"cbb8087d-e45b-4f65-9b7f-27ed52c9c830","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/100/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/100/transactions"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/100/transactions"}],"useCases":["Retrieving or submitting portfolio transaction records via a pay-per-call model","Integrating portfolio data into automated trading or analytics pipelines","Demonstrating x402 payment flows for agent-to-agent commerce on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents needing on-demand portfolio transaction data without API key management","Low-volume, pay-as-you-go access to financial data endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription plans","Anyone requiring non-USDC or non-Base-network payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.501Z"},"updatedAt":"2026-04-28T05:34:35.155Z"}}