x402basequality 0.35

Pay-per-call stock quote for MRK (Merck) via x402 on Base, settled in USDC.

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

What it does

This endpoint at lowpaymentfee.com provides stock data for the ticker MRK (Merck & Co.) through an x402-gated API call. Each request costs $0.02 in USDC on the Base network, with no API keys, rate limits, or subscriptions required — you simply attach an x402 payment header to a POST request and receive a JSON response.

The endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced at $0.02 per request. The specific /api/v1/stocks/MRK route appears to serve stock-level data for Merck, though the exact response schema is not documented. The x402 challenge confirms the endpoint is live, accepts USDC (contract 0x8335…2913) on Base, and requires a maximum payment of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).

Documentation is extremely thin — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further detail. There is no OpenAPI spec, no example responses, and no description of request parameters or response fields. Agents should expect a JSON response but will need to experiment to determine the exact payload structure.

Capabilities

stock-quoteper-call-paymentx402usdc-baseno-api-keyno-rate-limit

Use cases

  • —Fetching current or recent stock data for Merck (MRK) in an automated trading or research pipeline
  • —Agents that need on-demand equity information without managing API keys or subscriptions
  • —Integrating stock lookups into LLM-based financial assistants with micropayment settlement

Fit

Best for

  • —AI agents needing keyless, pay-per-call stock data
  • —Developers prototyping financial tools who want zero-commitment API access
  • —Crypto-native workflows that can settle payments in USDC on Base

Not for

  • —High-frequency trading requiring sub-millisecond latency and bulk data
  • —Users who need comprehensive historical stock data or full market coverage
  • —Anyone without a Base-compatible USDC wallet

Quick start

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

Endpoint

URLhttps://lowpaymentfee.com/api/v1/stocks/MRK
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no example request/response, and no description of what fields the stock endpoint actually returns. Effectively a stub listing.

Warnings

  • —No OpenAPI spec or schema available — response format is unknown
  • —Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no content
  • —No example responses or field descriptions for the /api/v1/stocks/MRK endpoint
  • —The specific stock endpoint is not listed on the homepage; it may be undocumented or experimental

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 20:22:02Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/BRrqtt
Pay-per-call stock quote for MRK (Merck) via x402 on Base, settled in USDC. — Clawmart · Clawmart