{"id":"2e07b050-5cb2-4506-a47f-0b920c50787d","shortId":"VwrVjZ","kind":"x402","title":"US tax return data for 2020, paid per-request via x402 on Base with USDC.","tagline":"US tax return data for 2020, paid per-request via x402 on Base with USDC.","description":"This endpoint at lowpaymentfee.com provides access to US tax return data for the year 2020. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/tax/returns/2020` costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 `X-PAYMENT` header — no API keys, accounts, or rate limits are required. The provider advertises a flat $0.02/request pricing model across all its APIs with no minimums or commitments.\n\nDocumentation is extremely sparse. The crawled docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the tax returns endpoint actually returns or what input parameters it expects beyond being a POST endpoint. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to assess the actual data quality or coverage.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","tax-data","per-request-pricing","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["tax return API","2020 tax data","IRS tax returns","US tax filings","tax records API","pay-per-call tax data"],"warnings":["No API documentation available — docs, pricing, and API pages all render only a wallet connect prompt","No OpenAPI or input/output schema provided; request parameters and response format are unknown","The nature of the tax return data (source, coverage, accuracy) is completely undocumented","Cannot verify whether this endpoint returns real IRS data, synthetic data, or something else"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tax/returns/2020","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/2020","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, but there is no documentation, no OpenAPI schema, no request/response examples, and no description of what data is actually returned. The listing is essentially a stub with only pricing and protocol details 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'/request':132 '0.02':95,131 '000':99 '20':98 '2020':6,22,47 '2020 tax data' '402':205 '6':105 'IRS tax returns' 'US tax filings' 'access':38 'account':120 'across':135 'actual':184,219 'advertis':128 'ai/ml':69 'analyt':68 'api':60,118,138,153 'assess':217 'base':14,30,88,100 'base-network' 'beyond':192 'broader':53 'call':59 'challeng':207 'commit':143 'confirm':200 'connect':159 'content':165 'cost':94 'coverag':223 'crawl':149 'crypto':72 'data':4,20,43,67,220 'decim':106 'descript':176 'difficult':215 'doc':150 'document':144,212 'endpoint':34,77,92,183,196,198 'exampl':173 'expect':191 'extrem':146 'field':179 'financ':71 'flat':130 'handl':109 'header':116 'infer':70 'input':188 'key':119 'lack':210 'limit':123 'live':201 'lowpaymentfee.com':36 'make':213 'minimum':141 'model':134 'network':89 'no-api-key' 'offer':61 'openapi':169 'page':154 'paid':7,23 'paramet':189 'part':50 'pay':57 'pay-per-cal':56 'pay-per-call tax data' 'payment':81,107,115 'per':9,25,58,96 'per-request':8,24 'per-request-pricing' 'post':195 'post-endpoint' 'price':133,151 'prompt':161 'proper':204 'protocol':82 'provid':37,65,127 'qualiti':221 'rate':122 'request':10,26,97 'request/response':172 'requir':125 'return':3,19,42,156,182,185,202 'schema':170 'servic':75 'settl':83 'span':66 'spars':147 'specif':91 'suit':54 'tax':2,18,41,181 'tax records API' 'tax return API' 'tax-data' 'unit':101 'us':1,17,40 'usdc':16,32,85,103 'usdc-settlement' 'use':78 'util':74 'via':11,27,110 'wallet':160 'x':114 'x-payment':113 'x402':12,28,80,112,206 'x402-payment' 'year':46","prices":[{"id":"73e72a05-61c3-471e-8564-dfe27f0e079a","listingId":"2e07b050-5cb2-4506-a47f-0b920c50787d","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/2020","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:05.123Z"}],"sources":[{"listingId":"2e07b050-5cb2-4506-a47f-0b920c50787d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tax/returns/2020","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:05.123Z","lastSeenAt":"2026-04-26T15:33:15.483Z"}],"details":{"listingId":"2e07b050-5cb2-4506-a47f-0b920c50787d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tax/returns/2020 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/tax/returns/2020"},{"claim":"The provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/tax/returns/2020"}],"useCases":["Retrieving US tax return information for the 2020 tax year","Programmatic access to tax filing data without API key management","Agent-driven financial research requiring tax return records"],"bestFor":["Developers needing on-demand tax return data without subscription commitments","AI agents that can pay per-call via x402 on Base","Quick lookups of 2020 US tax return information"],"notFor":["Bulk historical tax data retrieval across many years (only 2020 is indicated)","Users who need detailed API documentation before integrating","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:47.87Z"},"updatedAt":"2026-04-26T15:33:15.483Z"}}