Historical stock price data for ticker C, paid per-request via x402 on Base.
What it does
This endpoint provides historical stock price data for the Citigroup (ticker: C) equity via a POST request to `/api/v1/stocks/C/history`. It is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-call APIs spanning finance, AI/ML, data analytics, and utilities — all settled on-chain using the x402 protocol on the Base network.
The endpoint costs $0.02 per request, payable in USDC (contract 0x8335…2913 on Base) with no API keys, subscriptions, or rate limits required. The x402 challenge advertises a maxAmountRequired of 20000 base units; since USDC uses 6 decimals, this equals $0.02. Payment is made by including an X-PAYMENT header conforming to x402 version 1, with a 300-second timeout window.
Documentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no sample request/response, and no description of the expected POST body or the shape of the returned historical data. The endpoint is confirmed live (returns 402 as expected), but the lack of documentation means callers will need to experiment to discover the correct request format and response structure.
Capabilities
Use cases
- —Retrieving historical price data for Citigroup (C) stock for backtesting or analysis
- —Building automated trading or research agents that pay per-query for market data
- —Integrating on-chain micropayment-gated stock data into Web3 dashboards
Fit
Best for
- —Agents or apps that need on-demand historical equity data without API key management
- —Developers who prefer crypto micropayments over traditional subscription billing
- —Low-volume or bursty access patterns where per-call pricing is economical
Not for
- —High-frequency trading requiring sub-second latency and bulk data feeds
- —Users who need comprehensive documentation or guaranteed SLA before integrating
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stocks/C/history \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it exists and accepts payment. However, there is no OpenAPI schema, no documentation of request/response formats, no sample data, and all doc pages render only a wallet-connect prompt. The listing is effectively a stub with pricing confirmed but functionality undocumented.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all show only a 'Connect wallet' prompt with no content.
- —No OpenAPI or schema describing the expected POST body or response shape for this endpoint.
- —The specific endpoint path /api/v1/stocks/C/history is not listed on the provider's landing page; only generic finance endpoints are shown. It is unclear whether this is a supported route or a catch-all.
- —Response format and data coverage (date range, granularity, fields) are entirely unknown.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 USDC base units on Base networkhttps://lowpaymentfee.com/api/v1/stocks/C/history
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stocks/C/history
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs