x402basequality 0.30

Mortgage data API endpoint on Base, pay-per-call via x402 with USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/mortgages/15

What it does

This endpoint at lowpaymentfee.com provides mortgage-related data via a POST request to `/api/v1/mortgages/15`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated by the x402 payment protocol on the Base network.

The specific `/api/v1/mortgages/15` endpoint is not listed on the provider's homepage among the advertised API categories, though the site's general pricing model is $0.02 per request. The x402 challenge for this endpoint shows a `maxAmountRequired` of 20,000 base units of USDC (token contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base, 6 decimals), which equals $0.02 USD — consistent with the site-wide pricing. Payment is made via the x402 `exact` scheme directly in the HTTP request header; no API keys or accounts are required.

Documentation is extremely sparse. The crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the mortgage endpoint actually returns. The path segment `15` may refer to a 15-year mortgage product or a specific resource ID, but this is unconfirmed. Callers should expect a JSON response (`mimeType: application/json`) but the exact schema is unknown.

Capabilities

x402-paymentusdc-basepay-per-requestmortgage-datajson-apino-api-key

Use cases

  • —Retrieving mortgage-related data or calculations programmatically
  • —Integrating mortgage information into financial dashboards or tools
  • —Agent-driven mortgage data lookups with instant crypto micropayments

Fit

Best for

  • —Developers needing on-demand mortgage data without subscription commitments
  • —AI agents that can settle x402 payments on Base for per-call access
  • —Applications requiring low-cost, keyless API access to financial data

Not for

  • —Users who need detailed API documentation or guaranteed schema stability
  • —Bulk mortgage data consumers who need high-volume batch access at lower unit cost
  • —Anyone unable to pay with USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/mortgages/15 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/mortgages/15
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (returns a valid x402 402 challenge) and pricing is clear at $0.02/request in USDC on Base. However, there is no documentation, no request/response schema, and the mortgage endpoint isn't even listed on the provider's own homepage. The purpose and output of this specific endpoint are entirely unknown.

Warnings

  • —No documentation available — docs, pricing, and README pages all render only a wallet-connect prompt
  • —The /api/v1/mortgages/15 endpoint is not listed among the provider's advertised APIs on the homepage
  • —No request or response schema is provided; callers cannot know what to send or expect back
  • —The meaning of '15' in the path (resource ID vs. 15-year mortgage) is unconfirmed

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 05:53:36Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-29

Agent access

JSONhttps://clawmart.sh/api/listings/gwF2xU
Mortgage data API endpoint on Base, pay-per-call via x402 with USDC. — Clawmart · Clawmart