US 2022 tax return data via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides access to US tax return data for the 2022 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.
The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is individually paid via the X-PAYMENT header. The x402 challenge was confirmed live, returning a proper 402 with version 1 challenge metadata.
Documentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads. The exact nature of the tax return data (e.g., aggregate statistics, individual lookup, IRS public data) is unknown from the available material. Users should test with a small payment to understand the response format before relying on this endpoint in production.
Capabilities
Use cases
- —Retrieving US 2022 tax return data programmatically
- —Integrating tax data into financial analysis pipelines
- —Agent-driven lookups of tax filing information with per-call payment
Fit
Best for
- —Developers needing on-demand tax data without subscription overhead
- —AI agents that can settle x402 micropayments on Base
- —Low-volume or sporadic tax data queries where pay-per-call is economical
Not for
- —High-volume bulk tax data retrieval where per-call costs add up
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Anyone unable to pay with USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/tax/returns/2022 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of the tax return data endpoint is vague — it's unclear what data it actually returns. This is effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt
- —No OpenAPI or request/response schema provided; request body format is unknown
- —The nature of the tax return data (aggregate, individual, public, etc.) is unspecified
- —Regulated data category (tax/financial data) — verify data provenance and compliance before use
Citations
- —Endpoint returns 402 with x402 version 1 challenge, accepting USDC on Base networkhttps://lowpaymentfee.com/api/v1/tax/returns/2022
- —Price is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/tax/returns/2022
- —Documentation pages (/docs, /pricing, /api, /README) render only a Connect wallet prompthttps://lowpaymentfee.com/docs