{"id":"77d327d8-66df-4c9d-84db-25171bcf2a5c","shortId":"Jmsa3q","kind":"x402","title":"Pay-per-call portfolio transactions endpoint on Base via x402, settled in USDC.","tagline":"Pay-per-call portfolio transactions endpoint on Base via x402, settled in USDC.","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/16/transactions`. 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 utility services — all gated by the x402 payment protocol on the Base network.\n\nThe specific endpoint probed here charges a maximum of $0.02 per request (20,000 base units of USDC, which has 6 decimals). Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. No API keys are required; access is granted instantly upon payment. The platform advertises no rate limits and no minimum commitments.\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 is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what request body is expected or what the response payload looks like. The broader site lists many other endpoints at $0.02 each across categories like sentiment analysis, text summarization, geocoding, and crypto gas estimates, but none have documented schemas either.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 finance endpoint","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto portfolio data"],"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 is published; callers cannot know what fields to send or expect.","The endpoint path references a specific portfolio ID (16); it is unclear whether other portfolio IDs are supported or what this data represents.","The broader platform lists many endpoints but none appear to have published documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/16/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/16/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 with a valid x402 402 challenge, but there is zero documentation: no OpenAPI schema, no request/response examples, no field descriptions. The docs pages all render only a wallet-connect prompt. The listing is effectively a stub with only pricing and network details 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'0.02':95,224 '000':99 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':116 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '20':98 '402':195 '6':106 'Base network API' 'USDC micropayment API' 'accept':184 'access':37,128 'across':226 'address':115 'advertis':136 'ai/ml':68 'analysi':230 'analyt':67 'api':64,124,151 'base':9,23,84,100,122 'base-network' 'bodi':206 'broader':53,217 'call':4,18 'categori':227 'chain':113 'challeng':197 'charg':91 'commit':143 'confirm':190 'connect':160 'content':166 'contract':119 'crawl':149 'crypto':235 'crypto portfolio data' 'data':41,66,71 'decim':107 'descript':177 'doc':150 'document':144,200,241 'dozen':58 'either':243 'enabl':32 'endpoint':7,21,33,88,183,188,222 'estim':237 'exampl':174 'expect':208 'extrem':146 'field':180 'finance/web3':70 'gas':236 'gate':76 'geocod':233 'grant':130 'infer':69 'instant':131 'key':125 'like':215,228 'limit':139 'list':219 'live':191 'look':214 'lowpaymentfee' 'lowpaymentfee.com':35,55 'mani':220 'maximum':93 'minimum':142 'network':85 'no-api-key' 'none':239 'offer':57 'on-chain':111 'openapi':170 'page':155 'part':50 'pay':2,16,61 'pay-per-cal':1,15 'pay-per-call API' 'pay-per-request':60 'payload':213 'payment':80,108,133 'per':3,17,62,96 'platform':54,135 'portfolio':5,19,39 'portfolio transactions API' 'portfolio-transactions' 'post':44 'price':152 'probe':89 'prompt':162 'proper':194 'protocol':81 'provid':36 'rate':138 'readm':154 'request':45,63,97,205 'request/response':173 'requir':127 'respons':212 'return':157,186,192 'schema':171,242 'sentiment':229 'servic':74 'settl':12,26,110 'site':218 'span':65 'spars':147 'specif':87 'substant':165 'summar':232 'text':231 'transact':6,20,40,182 'unclear':203 'unit':101 'upon':132 'usdc':14,28,103,118 'usdc-settlement' 'use':117 'util':73 'via':10,24,42 'wallet':161 'without':199 'x402':11,25,31,79,196 'x402 finance endpoint' 'x402-enabled':30 'x402-payment'","prices":[{"id":"151db919-ee6b-45af-bb18-d46df8a4c2cc","listingId":"77d327d8-66df-4c9d-84db-25171bcf2a5c","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/16/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":"2026-04-18T18:52:12.859Z"}],"sources":[{"listingId":"77d327d8-66df-4c9d-84db-25171bcf2a5c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/16/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:12.859Z","lastSeenAt":"2026-04-28T07:34:37.647Z"}],"details":{"listingId":"77d327d8-66df-4c9d-84db-25171bcf2a5c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/16/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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/16/transactions"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/16/transactions"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on 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":["Fetching portfolio transaction history without API key registration","Programmatic access to transaction data with per-call USDC micropayments","Agent-driven portfolio analysis workflows that pay per request on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go portfolio data access","AI agents that can settle x402 payments autonomously on Base","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users needing well-documented API schemas and request/response examples before integration","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":"2026-02-17T23:14:01.87Z"},"updatedAt":"2026-04-28T07:34:37.647Z"}}