US 2023 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 2023 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 via the x402 payment protocol on the Base network.
The specific endpoint `/api/v1/tax/returns/2023` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract 0x8335…2913) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.
Documentation is extremely sparse. The landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or example payloads. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. Because of this, the exact input parameters and response structure for the tax returns endpoint are unknown. Callers should expect to experiment or contact the provider for integration details.
Capabilities
Use cases
- —Retrieving 2023 US tax return data programmatically
- —Integrating tax data into financial analysis workflows
- —Agent-driven tax document lookup without API key management
Fit
Best for
- —Developers needing on-demand tax return data without subscription commitments
- —AI agents that can settle USDC micropayments on Base
- —Applications requiring 2023 US tax year information
Not for
- —Users who need detailed API documentation or schemas before integrating
- —Bulk historical tax data retrieval across many years
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/tax/returns/2023 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no documentation, no request/response schema, no examples, and the docs pages are empty. The purpose ('Premium API Access' / tax returns 2023) is vague with no detail on what data is actually returned or what inputs are accepted.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content.
- —No request or response schema provided; input parameters are completely unknown.
- —The nature of the 'tax returns 2023' data is unspecified — it is unclear whether this returns public aggregate data, synthetic data, or something else.
- —Tax/financial data may be subject to regulatory requirements depending on jurisdiction and data source.
Citations
- —Endpoint returns 402 with x402 challenge accepting USDC on Base at maxAmountRequired 20000https://lowpaymentfee.com/api/v1/tax/returns/2023
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/tax/returns/2023