Mortgage data endpoint on Base, pay-per-call with USDC via x402 protocol.
What it does
This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/66`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request 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/mortgages/66` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD — consistent with the platform's advertised flat $0.02/request pricing. No API keys are needed; access is granted by attaching an x402 payment header.
Documentation on the site is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/mortgages/66` endpoint actually returns. The resource ID `66` suggests it may retrieve data for a specific mortgage record, but this is speculative. The endpoint is confirmed live (returns a valid 402 challenge).
Capabilities
Use cases
- —Retrieving mortgage record data programmatically
- —Integrating mortgage information into financial dashboards
- —Agent-driven lookups of specific mortgage records with micropayments
Fit
Best for
- —Developers needing on-demand mortgage data without subscription commitments
- —AI agents that can settle USDC micropayments on Base
- —Applications requiring keyless, pay-per-use API access
Not for
- —Users who need detailed API documentation or schema guarantees before integrating
- —Bulk mortgage data retrieval (pay-per-call model may be costly at scale)
- —Non-crypto users who cannot settle payments on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/66 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no description of what the mortgage endpoint actually returns. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
- —No OpenAPI or JSON schema describing request parameters or response format
- —The specific data returned by /api/v1/mortgages/66 is unknown — the resource ID '66' is unexplained
- —The endpoint is not listed on the provider's own homepage among their advertised APIs
Citations
- —The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/mortgages/66
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/66