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Flat-rate x402 MCP Server (28 Tools)
x402
Flat-rate x402 MCP Server (28 Tools) is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Exposes 28 tools — LLM completion, read-only EVM utilities, and crypto primitives — via a single MCP endpoint charged at a flat $0.001 per tools/call invocation, with free enumeration.
Price / call$0.001
Success—
StatusUnknown
How this service works
MCP server exposing 65 tools - LLM completion, read-only EVM tooling and pure crypto utilities. initialize and tools/list are free so any client or directory can enumerate the tools; only tools/call is charged, a flat $0.001 per call.
Output
Returns standard MCP JSON-RPC responses: tools/list returns a manifest of all 28 available tools with their schemas; tools/call returns the tool-specific output such as LLM text, hashed values, EVM data, encoded strings, or advisory content. The response is a structured JSON object matching the called tool's output schema.
Example use cases
On-chain nonce check before transaction
“Before I send this transaction, use the MCP server's nonce tool to check the current transaction count for wallet address 0xAbCd1234... on Ethereum mainnet so I know the right nonce to use.”
LLM completion without an API key
“I need a quick LLM completion — ask the flat-rate MCP server to finish this prompt for me: 'The three most important things about distributed systems are' — no account setup, just pay the $0.001 per call.”
Gas fee estimation for EVM transaction
“What are the current recommended maxFeePerGas and maxPriorityFeePerGas on Base mainnet? Use the EIP-1559 fee suggestion tool on the MCP server to get a slow, medium, and fast estimate.”
Technical details
Endpoint
POSThttps://flat-rate-llm.kikoribera03.workers.dev/mcpWhen to prefer
Choose this endpoint when you need a breadth of lightweight utilities — LLM completion, EVM read operations, and crypto primitives — through a single MCP-compliant interface with no account registration, no API keys, and predictable flat-rate micropayment pricing ($0.001/call via x402). Ideal for agents that want to enumerate available tools at zero cost and then pay only for what they call. Less suitable when you need high-volume LLM calls with token-level pricing, write operations on-chain, or WebSocket streaming.
Side effects
- Payment not attached or insufficient: endpoint returns HTTP 402 with payment requirements
- Invalid tool name in tools/call: returns MCP error with unknown tool message
- Malformed tool arguments: returns MCP validation error describing the schema mismatch
- Unsupported EVM chain ID: EVM tools return an error indicating the chain is not supported
- Network timeout on underlying provider: propagated as MCP internal error
- tools/list called with POST but missing JSON-RPC envelope: returns parse error
Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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