US W-2 tax data for 2023, pay-per-request via x402 on Base (USDC).
What it does
This endpoint at lowpaymentfee.com provides access to 2023 W-2 tax data via a POST request, settled through the x402 protocol on the Base network using USDC. The cost per request is $0.02 (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services, all priced uniformly at $0.02 per request. This specific endpoint targets the `/api/v1/tax/w2/2023` resource. However, the crawled documentation is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the W-2 endpoint accepts or returns. The input schema indicates it accepts HTTP POST with JSON, but the exact payload structure and response format are unknown.
Because of the lack of documentation, callers should expect to experiment with request bodies or contact the provider for integration guidance. The endpoint is confirmed live (returns a proper 402 x402 challenge), and the pricing is clear, but the functional contract is opaque.
Capabilities
Use cases
- —Retrieving 2023 W-2 wage and tax statement data programmatically
- —Integrating W-2 information into tax preparation or filing workflows
- —Automated tax document verification for fintech applications
Fit
Best for
- —Developers building tax preparation tools needing 2023 W-2 data
- —Agents that need on-demand tax data without managing API keys
- —Applications requiring pay-per-use tax data access on crypto rails
Not for
- —Users needing comprehensive multi-year tax data (only 2023 W-2 is indicated)
- —Applications requiring detailed API documentation or guaranteed SLAs before integration
- —Non-crypto payment workflows (only USDC on Base is accepted)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/tax/w2/2023 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live with a valid 402 x402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — docs pages render only 'Connect wallet'. The exact purpose and data contract of the W-2 endpoint are entirely inferred from the URL path.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No request or response schema provided; payload structure is unknown
- —The nature of the W-2 data returned (synthetic, lookup, calculation) is unspecified
- —Tax data endpoints may involve regulated or sensitive information — verify compliance requirements
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/tax/w2/2023
- —All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/tax/w2/2023