{"id":"46755fb0-8c74-4e9d-b98f-b7b9297e337d","shortId":"5R2FkX","kind":"x402","title":"US 2025 tax-return data via x402 micropayment on Base for $0.02/request","tagline":"US 2025 tax-return data via x402 micropayment on Base for $0.02/request","description":"This endpoint at lowpaymentfee.com provides access to a tax returns API for the 2025 tax year. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/tax/returns/2025` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request. Payment is made via the x402 \"exact\" scheme to the provider's wallet. No API keys, rate limits, or subscriptions are needed — each call is individually settled on-chain.\n\nDocumentation is extremely sparse. The provider's 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 fields the tax-returns endpoint accepts or returns. The endpoint's purpose (tax return data, tax filing assistance, or something else) is unclear beyond the URL path. Prospective users should test with a small payment to discover the actual input/output contract.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","tax-data","json-api","no-api-key","post-method"],"categories":["finance","data"],"synonyms":["tax return API","2025 tax data","tax filing endpoint","x402 tax API","micropayment tax service","Base USDC API","pay-per-call tax"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or input/output schema provided; request and response formats are unknown","The purpose of '/api/v1/tax/returns/2025' is unclear — it could be tax data retrieval, filing, or something else","This endpoint is not listed on the provider's homepage among their advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tax/returns/2025","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/tax/returns/2025","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the tax-returns endpoint actually accepts or returns. The listing is essentially a 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'/request':14,28 '0.02':13,27,116 '000':105 '0x8335':110 '20':104 '2025':2,16,42 '2025 tax data' '2913':111 'Base USDC API' 'accept':87,192 'access':34 'actual':225 'ai/ml':63 'analyt':62 'api':39,59,133,158 'assist':204 'base':11,25,79,106,113 'behind':72 'beyond':210 'broader':50 'call':58,142 'chain':148 'challeng':95 'confirm':96 'connect':166 'content':172 'contract':227 'crypto':66 'data':6,20,61,201 'descript':183 'discov':223 'doc':156 'document':149 'dozen':53 'els':207 'endpoint':30,85,191,196 'equal':115 'exact':125 'exampl':180 'extrem':151 'field':186 'file':203 'financ':65 'gate':71 'individu':144 'infer':64 'input/output':226 'json':92 'json-api' 'key':134 'limit':136 'live':99 'lowpaymentfee.com':32 'made':121 'maximum':102 'micropay':9,23 'micropayment tax service' 'need':140 'network':80 'no-api-key' 'offer':52 'on-chain':146 'openapi':176 'page':161 'part':47 'path':213 'pay':56 'pay-per-cal':55 'pay-per-call tax' 'pay-per-request' 'payment':75,119,221 'per':57,117 'platform':51 'post':88 'post-method' 'price':157 'prompt':168 'prospect':214 'protocol':76 'provid':33,129,154 'purpos':198 'rate':135 'readm':160 'render':163 'request':89,118 'request/response':179 'requir':100 'return':5,19,38,91,190,194,200 'schema':177 'scheme':126 'servic':69 'settl':145 'small':220 'someth':206 'span':60 'spars':152 'specif':84 'subscript':138 'substant':171 'tax':4,18,37,43,189,199,202 'tax filing endpoint' 'tax return API' 'tax-data' 'tax-return':3,17,188 'test':217 'unclear':209 'unit':107 'url':212 'us':1,15 'usdc':82,109 'usdc-base' 'use':81 'user':215 'util':68 'via':7,21,122 'wallet':131,167 'x402':8,22,74,94,124 'x402 tax API' 'x402-payment' 'year':44","prices":[{"id":"245b5835-d735-40f6-9ea7-bddf839e5aaf","listingId":"46755fb0-8c74-4e9d-b98f-b7b9297e337d","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/tax/returns/2025","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:03.239Z"}],"sources":[{"listingId":"46755fb0-8c74-4e9d-b98f-b7b9297e337d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tax/returns/2025","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:03.239Z","lastSeenAt":"2026-04-26T15:33:15.447Z"}],"details":{"listingId":"46755fb0-8c74-4e9d-b98f-b7b9297e337d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tax/returns/2025 \\\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 requiring 20,000 base units of USDC on Base (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/tax/returns/2025"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/tax/returns/2025"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving 2025 US tax return data programmatically","Integrating tax information into financial dashboards","Agent-driven tax data lookups without API key management"],"bestFor":["Developers needing on-demand tax data without subscriptions","AI agents that can settle x402 payments on Base","Applications requiring low-cost per-request tax lookups"],"notFor":["Users who need detailed API documentation before integrating","Bulk tax data retrieval where per-request costs would accumulate","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:47.922Z"},"updatedAt":"2026-04-26T15:33:15.447Z"}}