x402basequality 0.35

Historical USD/HKD forex data via x402 micropayment on Base, $0.02 per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/forex/USDHKD/history

What it does

This endpoint provides historical exchange-rate data for the USD/HKD currency pair. It is part of a broader suite of pay-per-request APIs hosted at lowpaymentfee.com, covering finance, analytics, AI/ML, and utility services. The endpoint is accessed via HTTP POST and is gated by the x402 payment protocol — no API keys or accounts are required. Instead, callers attach an X-PAYMENT header with a USDC payment on the Base network.

Pricing is $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base. The x402 challenge specifies a 300-second payment timeout and uses the "exact" payment scheme.

Documentation is minimal — the provider's docs, pricing, and API pages all render only a wallet-connect prompt with no further detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the exact request body format and response structure for historical forex data are unknown. Users should expect to experiment or contact the provider for integration details.

Capabilities

forex-historyusd-hkdx402-paymentusdc-basepay-per-requestno-api-keymicropayment

Use cases

  • —Retrieving historical USD/HKD exchange rates for financial analysis
  • —Backtesting currency trading strategies with historical forex data
  • —Building dashboards that display USD/HKD rate trends over time
  • —Programmatic access to forex history without API key registration

Fit

Best for

  • —Developers needing quick, keyless access to USD/HKD historical rates
  • —Agents or bots that can settle x402 micropayments on Base
  • —Projects requiring pay-as-you-go forex data without subscriptions

Not for

  • —Users who need real-time streaming forex quotes (this is historical data)
  • —Applications that cannot settle USDC payments on the Base network
  • —Users who need detailed API documentation or guaranteed SLAs

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/forex/USDHKD/history \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/forex/USDHKD/history
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The request body format and response structure are entirely unknown.

Warnings

  • —No API documentation available — docs, pricing, and API pages only show a wallet-connect prompt
  • —No OpenAPI or JSON schema for request or response bodies
  • —Request body format for historical forex queries is unknown (date ranges, granularity, etc.)
  • —Response structure is undocumented — cannot confirm what fields are returned

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 04:50:51Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-29

Agent access

JSONhttps://clawmart.sh/api/listings/LGyFRy
Historical USD/HKD forex data via x402 micropayment on Base, $0.02 per request. — Clawmart · Clawmart