Mortgage data endpoint on Base, pay-per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to mortgage-related data via a pay-per-request x402 protocol. The specific resource `/api/v1/mortgages/12` is listed under the provider's "Premium API Access" label. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with an exact-payment scheme.
The provider operates a broader platform offering dozens of endpoints across data & analytics, AI/ML, finance/Web3, and infrastructure categories, all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. The mortgage endpoint's x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site-wide pricing.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the mortgage data actually contains. The endpoint is confirmed live (returns a valid 402 challenge), but the exact data payload and required POST body are unknown.
Capabilities
Use cases
- —Retrieving mortgage-related data for a specific record (ID 12)
- —Integrating mortgage information into financial analysis pipelines
- —Agent-driven on-demand mortgage data lookups without API key management
Fit
Best for
- —Agents needing keyless, pay-per-call access to mortgage data
- —Developers experimenting with x402 payment protocol integrations
- —Low-volume, on-demand mortgage data retrieval
Not for
- —Bulk mortgage data downloads or high-throughput batch processing (no documented batch endpoints)
- —Users who need detailed documentation or schema guarantees before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/12 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"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 spec, no request/response schema, and no examples. The mortgage endpoint itself is not listed on the provider's homepage, and all doc pages render only 'Connect wallet'. The actual data content is entirely unknown.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or schema describing request body or response format for the mortgages endpoint
- —The /api/v1/mortgages/12 path is not listed among the provider's advertised endpoints on the homepage
- —Exact data content and required POST body are unknown — integration requires trial and error
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/mortgages/12
- —Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/12