Solana Priority Fee Estimator API
Solana priority fee estimates at 6 levels (min to max). Essential for every Solana transaction. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.
Quickstart -- MCP
Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):
{
"mcpServers": {
"solana-fees": {
"url": "https://solana-fees.api.klymax402.com/mcp"
}
}
}
Quickstart -- HTTP (x402)
curl "https://solana-fees.api.klymax402.com/api/fees"
# -> 402 Payment Required, with an x402 payment challenge in the response body
Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.
Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
solana_get_priority_fees | GET | /api/fees | $0.003 | Priority fee estimates for Solana transactions |
solana_get_priority_fees
Use this when you need priority fee estimates before sending a Solana transaction. Returns recommended compute unit prices at 6 levels based on recent network activity.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
program | string | no | Program ID to get program-specific fees (e.g. JUP6LkbZbjS1jKKwapdHNy74zcZ3tLUZoi5QNyVTaV4 for Jupiter). Optional β omit for global fees. |
Returns
fees-- object with 6 fee levels in microlamports per compute unitmin-- minimum fee observed (cheapest, may fail in congestion)low-- 25th percentile fee (budget transactions)medium-- 50th percentile fee (recommended default)high-- 75th percentile fee (fast confirmation)veryHigh-- 90th percentile fee (priority during congestion)max-- maximum fee observed (guaranteed fast)
Example response:
{"fees":{"min":1,"low":100,"medium":1000,"high":5000,"veryHigh":50000,"max":500000},"slot":285432100,"program":"global","updatedAt":"2026-04-13T12:00:00Z"}
When to use: every Solana transaction to set the right priority fee. Essential for Jupiter swaps, NFT mints, token transfers, and program interactions.
Example agent prompts
- "Priority fee estimates before sending a Solana transaction"
Payment
- Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (
eip155:8453) - Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
- Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)
Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT