{"id":"7b20c319-f7f1-4bf4-8620-e047e2a75d31","shortId":"BKCepA","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, paid per-call in USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/92/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all payable per-request in USDC on the Base network with no API keys or rate limits required.\n\nThe specific endpoint listed here costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is made via the x402 protocol: callers include an `X-PAYMENT` header containing a signed payment proof, and the server verifies it before returning the response. The x402 challenge confirms the endpoint is live, accepts USDC on Base (contract `0x8335…2913`), and uses the \"exact\" payment scheme with a 300-second timeout.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the portfolio transactions endpoint actually returns. The endpoint path suggests it retrieves or creates transactions for a specific portfolio (ID 92), but the exact input format and output structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","portfolio-transactions","post-endpoint","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No OpenAPI schema or endpoint documentation available","All doc/pricing/README pages render only 'Connect wallet' with no content","The specific function of /api/v1/portfolios/92/transactions is undocumented — input and output formats are unknown","Portfolio ID 92 is hardcoded in the path; unclear if other portfolio IDs are accessible"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/92/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/92/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 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 return only a wallet-connect prompt. The purpose of the specific portfolio/92/transactions endpoint is unclear beyond what can be inferred from the URL 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'0.02':97 '000':101 '0x8335':150 '20':100 '2913':151 '300':160 '6':107 '92':221 'Base network API' 'USDC micropayment API' 'accept':145 'access':34 'actual':205 'ai/ml':65 'analyt':64 'api':61,85,172 'base':8,22,81,102,148 'broader':50 'call':12,26 'caller':116 'challeng':139 'confirm':140 'connect':181 'contain':123 'content':187 'contract':149 'cost':96 'creat':214 'crypto payment endpoint' 'data':38,63,68 'decim':108 'descript':198 'doc':171 'document':163 'endpoint':6,20,30,93,142,204,208 'exact':155,224 'exampl':195 'extrem':168 'finance/web3':67 'format':226 'gate':3,17,60 'header':122 'id':220 'includ':117 'infer':66 'infrastructur':70 'input':225 'key':86 'limit':89 'list':94 'live':144 'lowpaymentfee' 'lowpaymentfee.com':32,52 'made':111 'network':82 'no-api-key' 'offer':54 'openapi':191 'output':228 'page':176 'paid':9,23 'part':47 'path':209 'pay-per-call API' 'payabl':73 'payment':109,121,126,156 'per':11,25,75,98 'per-cal':10,24 'per-request':74 'per-request-billing' 'platform':51 'portfolio':4,18,36,202,219 'portfolio transactions API' 'portfolio-transactions' 'post':41 'post-endpoint' 'price':173 'prompt':183 'proof':127 'protocol':115 'provid':33 'rate':88 'readm':175 'render':178 'request':42,76,99 'request/response':194 'requir':90 'respons':136 'retriev':212 'return':134,206 'schema':192 'scheme':157 'second':161 'server':130 'sign':125 'site':166 'span':62 'spars':169 'specif':92,218 'structur':229 'suggest':210 'timeout':162 'transact':5,19,37,203,215 'unit':103 'unknown':231 'usdc':14,28,78,105,146 'usdc-base' 'use':153 'util':71 'varieti':56 'verifi':131 'via':39,112 'wallet':182 'x':120 'x-payment':119 'x402':2,16,59,114,138 'x402 paid API' 'x402-gated':1,15,58 'x402-payment'","prices":[{"id":"9ac93822-25d4-43c6-adfa-12d74424b47a","listingId":"7b20c319-f7f1-4bf4-8620-e047e2a75d31","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/92/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":"2026-04-18T18:53:44.090Z"}],"sources":[{"listingId":"7b20c319-f7f1-4bf4-8620-e047e2a75d31","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/92/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:44.090Z","lastSeenAt":"2026-04-27T14:05:19.580Z"}],"details":{"listingId":"7b20c319-f7f1-4bf4-8620-e047e2a75d31","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/92/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/92/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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/92/transactions"}],"useCases":["Retrieving or submitting portfolio transaction records via a pay-per-call model","Integrating x402 payment flows into agent-driven financial data pipelines","Accessing financial portfolio data without traditional API key management"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need on-demand portfolio transaction data with crypto micropayments","Use cases where avoiding API key provisioning is desirable"],"notFor":["Users needing well-documented, production-grade financial APIs with clear schemas","High-volume consumers who need bulk pricing or subscription plans","Anyone requiring fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.487Z"},"updatedAt":"2026-04-27T14:05:19.580Z"}}