US 2025 tax-return data via x402 micropayment on Base for $0.02/request
What it does
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.
The 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.
Documentation 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.
Capabilities
Use cases
- —Retrieving 2025 US tax return data programmatically
- —Integrating tax information into financial dashboards
- —Agent-driven tax data lookups without API key management
Fit
Best for
- —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
Not for
- —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
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/tax/returns/2025 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
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 stub.
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
Citations
- —The endpoint returns a 402 x402 challenge requiring 20,000 base units of USDC on Base (=$0.02)https://lowpaymentfee.com/api/v1/tax/returns/2025
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/tax/returns/2025
- —Docs, pricing, API, and README pages render only 'Connect wallet' with no substantive documentationhttps://lowpaymentfee.com/docs