Pay-per-call market quote for Solana (SO) via x402 on Base, settled in USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides a market quote for the token ticker "SO" (likely Solana or a related asset) via a simple POST request. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/crypto, and utility services. All endpoints on the platform share the same pricing model: $0.02 per request, paid in USDC on the Base network using the x402 protocol.
The x402 challenge was successfully captured, confirming the endpoint is live. It accepts payments in USDC (contract 0x8335…2913 on Base) with a max amount of 20,000 base units, which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. No API key or account registration is required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
Documentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The exact structure of the POST body and the shape of the returned quote data are unknown. The endpoint path suggests it returns a market quote for the asset identified by "SO", but the specific fields (price, volume, timestamp, etc.) cannot be confirmed from available material.
Capabilities
Use cases
- —Fetching real-time or near-real-time market quotes for the SO token
- —Integrating crypto price data into trading bots or dashboards without API key management
- —Agent-driven market data retrieval with micropayment settlement on Base
Fit
Best for
- —Developers needing quick, keyless access to crypto market quotes
- —AI agents that can settle x402 micropayments autonomously
- —Prototyping or low-volume crypto data integrations without subscription commitments
Not for
- —High-frequency trading requiring sub-millisecond latency and guaranteed SLAs
- —Users who need comprehensive historical market data or OHLCV candles
- —Anyone unable to settle USDC payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/SO \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and all documentation pages returned only a wallet-connect stub. The actual functionality and response format are entirely inferred from the URL path.
Warnings
- —No OpenAPI or schema documentation available — request body and response format are unknown
- —All doc/pricing/README pages return only a 'Connect wallet' prompt with no substantive content
- —The ticker 'SO' is ambiguous — it may refer to Solana (SOL) or another asset; no confirmation in docs
- —No rate limit, SLA, or uptime guarantees documented
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/market/quote/SO
- —Price is $0.02 per request (maxAmountRequired 20000 base units in USDC with 6 decimals)https://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/market/quote/SO
- —Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com