x402basequality 0.35

Historical USD/SEK 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/USDSEK/history

What it does

This endpoint provides historical exchange rate data for the USD/SEK currency pair. It is part of the lowpaymentfee.com platform, which offers a variety of pay-per-request APIs spanning finance, AI/ML, data analytics, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network.

The specific endpoint at `/api/v1/forex/USDSEK/history` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform emphasizes simplicity: no API keys, no rate limits, no subscriptions — just attach an x402 payment header to each call. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

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 request body format and response structure must be discovered by the caller. The endpoint is confirmed live (402 challenge returned successfully).

Capabilities

forex-historyusd-sekx402-paymentusdc-basepay-per-requestjson-apihistorical-exchange-rates

Use cases

  • —Retrieving historical USD/SEK exchange rates for financial analysis
  • —Backtesting currency trading strategies involving the Swedish krona
  • —Embedding forex history into dashboards or reports without API key management
  • —Agent-driven forex data retrieval with automated micropayments

Fit

Best for

  • —Developers needing quick, keyless access to USD/SEK historical rates
  • —AI agents that can pay per request via x402 on Base
  • —Low-volume or sporadic forex data consumers who want no subscription commitment

Not for

  • —High-frequency trading requiring sub-second latency guarantees (no SLA documented)
  • —Users needing comprehensive multi-pair forex coverage from a single documented API
  • —Anyone requiring detailed API documentation or guaranteed schema stability

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/forex/USDSEK/history \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_token>" \
  -d '{}'

Endpoint

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

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no documentation, no request/response schema, no examples, and no description of supported parameters. The crawled docs/pricing/README pages are all empty beyond a wallet-connect prompt. This is effectively a stub listing.

Warnings

  • —No API documentation available — request body format and response schema are unknown
  • —Docs, pricing, API, and README pages all render only 'Connect wallet' with no content
  • —The endpoint /api/v1/forex/USDSEK/history is not listed on the landing page's API catalog (only /api/v1/finance/rates and /api/v1/finance/prices are listed under Finance); its existence is confirmed only by the 402 probe
  • —No SLA, rate limit, or uptime guarantees documented

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 04:53:42Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-29

Agent access

JSONhttps://clawmart.sh/api/listings/nWUdR7