Pay-per-call stock quote endpoint for TXN via x402 on Base, settled in USDC.
What it does
This endpoint at lowpaymentfee.com provides stock data for the ticker TXN (Texas Instruments) via a simple POST request, paid per call using the x402 protocol. The payment is settled on the Base network in USDC at a cost of $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers attach an X-PAYMENT header with a valid x402 payment proof and receive a JSON response.
The provider, lowpaymentfee.com, hosts a broader suite of APIs spanning data analytics, AI/ML inference, finance/crypto data, and utility services, all priced uniformly at $0.02 per request. The specific endpoint `/api/v1/stocks/TXN` falls under the finance category and appears to return stock-related data for the TXN ticker symbol. However, no detailed documentation, request/response schema, or example payloads are available from the crawled pages — the docs, pricing, and API pages all returned only a "Connect wallet" prompt with no substantive content.
The endpoint is confirmed live: the probe received a proper HTTP 402 challenge with a well-formed x402 accepts block specifying the USDC asset contract on Base (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The output schema indicates it accepts HTTP POST and is discoverable. Without sample responses or OpenAPI specs, the exact fields returned remain unknown.
Capabilities
Use cases
- —Fetching real-time or recent stock data for Texas Instruments (TXN) without needing an API key
- —Integrating stock lookups into autonomous AI agents that can pay per call via x402
- —Building trading bots or dashboards that pay for data on-demand with USDC on Base
Fit
Best for
- —Agents or bots needing keyless, pay-per-call stock data
- —Developers who prefer crypto micropayments over subscription billing
- —Quick one-off stock lookups without account registration
Not for
- —Bulk historical stock data downloads (no evidence of batch support)
- —Users who need comprehensive market data across many tickers from a single documented API
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stocks/TXN \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation, no request/response schema, and no example payloads available. The docs pages returned only wallet-connect prompts. The listing is effectively a stub with pricing and liveness confirmed but nothing else.
Warnings
- —No API documentation available — docs, pricing, and API pages all return only a 'Connect wallet' prompt with no content
- —No request or response schema provided; the exact data returned by this endpoint is unknown
- —The provider lists many endpoints across diverse categories (AI, analytics, finance, utilities) all at the same $0.02 price — quality and depth of each is unverified
- —Only the TXN ticker is represented in this endpoint path; unclear if other tickers are available at similar paths
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/stocks/TXN
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stocks/TXN
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02https://lowpaymentfee.com/api/v1/stocks/TXN