{"id":"94e87343-1366-48af-a5ca-2e58a4c0319d","shortId":"AxpTnW","kind":"x402","title":"US 2024 tax return data via x402 micropayment on Base for $0.02 per request.","tagline":"US 2024 tax return data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to 2024 US tax return data through the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services, all priced at $0.02 per request. The platform emphasizes simplicity: no subscriptions, no minimums, and instant access via the x402 protocol on the Base L2 network.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional 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 is confirmed live (returns a proper 402 challenge), but the actual data content and required POST body are unknown.","tags":[],"capabilities":["x402-payment","base-network","usdc-settlement","tax-data","json-response","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["tax return API","2024 tax data","IRS tax return","US tax filing data","tax records API","x402 tax endpoint","micropayment tax API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI schema or request/response examples provided.","The nature of the tax return data (scope, fields, source) is completely undocumented.","It is unclear whether this endpoint returns real IRS data, synthetic data, or something else entirely.","Tax data may be subject to regulatory requirements (e.g., IRS data handling, PII protections) that are not addressed anywhere on the site."],"endpointUrl":"https://lowpaymentfee.com/api/v1/tax/returns/2024","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/2024","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it exists and accepts USDC on Base. However, there is zero documentation on request format, response schema, or what tax data is actually returned. The docs/pricing/README pages are all blank beyond a wallet connect prompt. Without any schema, examples, or substantive documentation, this is effectively a stub 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'000':72 '20':71 '2024':2,16,36 '2024 tax data' '402':205 '6':76 'IRS tax return' 'US tax filing data' 'accept':47,194 'access':34,144 'actual':209 'addit':174 'ai/ml':121 'analyt':120 'api':79,117,160 'attach':88 'base':10,24,58,73,151 'base-network' 'bodi':215 'broader':106 'call':116 'caller':86 'challeng':206 'coin':63 'confirm':200 'connect':169 'content':175,211 'cost':66 'crypto':124 'data':5,19,40,119,210 'decim':77 'descript':186 'doc':159 'document':154 'dozen':111 'emphas':136 'endpoint':30,101,193,198 'exampl':183 'extrem':156 'field':189 'financ':123 'header':93 'infer':122 'instant':143 'json':52 'json-response' 'key':80 'l2':152 'limit':83 'live':201 'lowpaymentfee.com':32,108 'micropay':8,22 'micropayment tax API' 'minimum':141 'network':59,153 'no-api-key' 'offer':110 'openapi':179 'page':164 'part':103 'pay':114 'pay-per-cal':113 'pay-per-request' 'payment':44,53,92,98 'per':13,27,69,115,132 'platform':107,135 'post':48,214 'price':129,161 'prompt':171 'proof':99 'proper':204 'protocol':45,148 'provid':33 'rate':82 'readm':163 'render':166 'request':14,28,49,70,133 'request/response':182 'requir':85,213 'return':4,18,39,51,192,196,202 'schema':180 'servic':127 'settl':55 'simpli':87 'simplic':137 'span':118 'spars':157 'subscript':139 'tax':3,17,38,191 'tax records API' 'tax return API' 'tax-data' 'unit':74 'unknown':217 'us':1,15,37 'usd':62 'usdc':61 'usdc-settlement' 'use':60 'util':126 'valid':96 'via':6,20,145 'wallet':170 'x':91 'x-payment':90 'x402':7,21,43,97,147 'x402 tax endpoint' 'x402-payment'","prices":[{"id":"70924bd4-41b8-4c9e-bd27-2ec488bca4d2","listingId":"94e87343-1366-48af-a5ca-2e58a4c0319d","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/2024","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:03.936Z"}],"sources":[{"listingId":"94e87343-1366-48af-a5ca-2e58a4c0319d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tax/returns/2024","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:03.936Z","lastSeenAt":"2026-04-26T15:33:15.378Z"}],"details":{"listingId":"94e87343-1366-48af-a5ca-2e58a4c0319d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tax/returns/2024 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d 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micropayments"],"bestFor":["Developers needing on-demand tax return data without subscription commitments","AI agents that can settle x402 payments on Base","Low-volume or sporadic tax data lookups at $0.02 per call"],"notFor":["Users who need detailed API documentation or schema before integrating","Bulk tax data retrieval where per-call pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:47.979Z"},"updatedAt":"2026-04-26T15:33:15.378Z"}}