{"id":"f25f89cd-ceba-4913-baf4-48027e3d3e64","shortId":"rdWrs9","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 #67 via the x402 payment protocol. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 challenges settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/67/transactions` accepts POST requests and charges a maximum of 20,000 base units of USDC (0.02 USD) per call, consistent with the platform's uniform $0.02/request pricing. Payment is made via the x402 exact scheme to the specified payTo address, using the canonical Base USDC contract (0x8335…2913). No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the transactions endpoint actually returns or what POST body it expects. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality the transactions resource provides. The platform appears to be a demonstration or early-stage x402 API marketplace.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","portfolio-transactions","post-endpoint"],"categories":["finance","payments"],"synonyms":["portfolio transactions API","x402 API","USDC micropayment API","lowpaymentfee","pay-per-call API","Base network API","crypto payment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; request body and response format are unknown","The purpose of the /portfolios/67/transactions endpoint is undocumented — it is unclear what data it returns or accepts","Platform may be a demo or early-stage project; reliability and longevity are uncertain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/67/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/67/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on request format, response schema, or what the transactions resource actually does. No OpenAPI spec, no examples, and all doc pages are empty. This is effectively a stub 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'/request':116 '0.02':105,115 '000':100 '0x8335':137 '20':99 '2913':138 '402':213 '67':42 'Base network API' 'USDC micropayment API' 'accept':91 'access':147 'actual':197 'address':130 'advertis':146 'ai/ml':68 'analyt':67 'api':39,64,140,166,241 'appear':231 'base':8,22,37,85,101,134 'base-network' 'behind':77 'bodi':202 'broader':53 'call':12,26,108 'canon':133 'challeng':79,214 'charg':95 'confirm':208 'connect':174 'consist':109 'content':180 'contract':136 'crypto payment API' 'data':66,71,222 'demonstr':235 'descript':191 'doc':164 'document':156,217 'dozen':58 'earli':238 'early-stag':237 'endpoint':6,20,30,89,196,206 'exact':124 'exampl':188 'expect':204 'expos':33 'extrem':161 'finance/web3':70 'function':224 'gate':3,17,76 'grant':149 'header':155 'infer':69 'infrastructur':73 'key':141 'limit':144 'live':209 'lowpaymentfee' 'lowpaymentfee.com':32,55 'made':120 'marketplac':242 'maximum':97 'network':86 'offer':57 'openapi':184 'page':169 'part':50 'pay':10,24,61 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':60 'payment':46,118,154 'payto':129 'per':11,25,62,107 'platform':54,112,230 'portfolio':4,18,41 'portfolio transactions API' 'portfolio-transactions' 'post':36,92,201 'post-bas':35 'post-endpoint' 'price':117,165 'prompt':176 'protocol':47 'provid':228 'pure':150 'rate':143 'readm':168 'render':171 'request':63,93 'request/response':187 'resourc':227 'return':198,210 'schema':185 'scheme':125 'settl':80 'site':159 'span':65 'specif':88 'specifi':128 'stage':239 'substant':179 'thin':162 'transact':5,19,38,195,226 'unclear':220 'uniform':114 'unit':102 'usd':106 'usdc':14,28,82,104,135 'usdc-settlement' 'use':131 'util':74 'valid':212 'via':43,121 'wallet':175 'without':216 'x402':2,16,45,78,123,153,240 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"12d69639-3e7e-4249-906d-bfdac6d94e2a","listingId":"f25f89cd-ceba-4913-baf4-48027e3d3e64","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/67/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":"2026-04-18T18:53:15.833Z"}],"sources":[{"listingId":"f25f89cd-ceba-4913-baf4-48027e3d3e64","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/67/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:15.833Z","lastSeenAt":"2026-04-23T05:01:30.279Z"}],"details":{"listingId":"f25f89cd-ceba-4913-baf4-48027e3d3e64","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/67/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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/67/transactions"},{"claim":"Platform-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract used is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/67/transactions"}],"useCases":["Submitting or retrieving portfolio transaction records via a pay-per-call model","Integrating x402-compatible agents with financial transaction endpoints","Testing x402 payment flows against a live endpoint on Base"],"bestFor":["Developers experimenting with x402 payment protocol integration","Agents that need pay-per-call access without API key management","Low-volume, on-demand portfolio transaction queries"],"notFor":["Production use cases requiring documented request/response schemas","High-volume batch transaction processing (no documented rate limits but no guarantees either)","Users who need non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.818Z"},"updatedAt":"2026-04-23T05:01:30.279Z"}}