24 Services from x402.freeq.one

Verify an ed25519 Solana wallet signature over a nonce-containing message and return the signer's public key, consuming the nonce on success.

Verify a Sign-In-With-Ethereum (EIP-4361) SIWE signature, returning the recovered wallet address and chainId without creating sessions or consuming nonces.

Renders a Mermaid diagram definition string into a PNG or SVG image, returning a base64-encoded image via MCP content type.

Batch-verifies up to 10 Semaphore ZK proofs in a single pay-per-call request, returning per-proof results with total count and average verification duration.

Purchase a digital gift card code for a specified product and face value, paid via x402 micropayment protocol.

Converts an Ethereum address to its EIP-55 checksummed form for use in SIWE (Sign-In With Ethereum) messages and other standards requiring checksummed addresses.

Locally verify a Semaphore ZK proof using Groth16 with an embedded official verification key, requiring no external dependencies.

Verifies a NIP-98 Nostr HTTP authentication event and returns the signer's public key, with stateful replay protection ensuring each event ID is only accepted once.

Chat with a language model via an OpenAI-compatible /v1/chat/completions interface supporting 50+ models, paid per-call in USDC on Base via x402

Verifies a World ID 4.0 proof by proxying through the Worldcoin Developer Portal API with server-side RP signature generation, returning validity, nullifier, and raw Worldcoin response.

Generates a QR code or barcode image (SVG or PNG) for a given data string and symbology, returning a base64-encoded image via a pay-per-call API.

Converts an HTML string to clean, LLM-ready Markdown with configurable heading style, bullet markers, code block style, and emphasis delimiters.

Buy a digital gift card by product ID and face value, settled in USDC on Base via the x402 pay-per-call protocol — no account required.

A pay-per-use MCP gateway exposing 15 tools (including markdown, token prices, wallet portfolio, whale alerts, and more) over the x402 payment protocol on Base, requiring no accounts, logins, or API keys.

Generates a 1200x630 Open Graph social-card PNG image from a title and description, returned as a base64-encoded image.

Pay-per-call MCP gateway exposing 7 tools (markdown conversion, token price, wallet portfolio, whale alerts, cross-chain balance, changelog from OpenAPI, changelog from Git) with per-tool micropayments on Base via x402

Fetches large on-chain cryptocurrency transfer alerts (whale movements) across blockchain networks, paid per-call via x402 on Base.

Returns the current price of a cryptocurrency token, paid per-call via x402 micropayment on Base.

Generate a formatted changelog from a Git repository's commit history using AI, paying per call via x402 micropayments on Base

Fetches the token balances of a wallet address across multiple blockchain networks in a single call

Generates a structured changelog from an OpenAPI specification, diffing versions to surface added, changed, or removed endpoints and schemas

Converts a Markdown string to rendered HTML via a pay-per-call x402 micropayment gateway on Base

Returns the token holdings and balances across a wallet address on Base and other chains, paid per-call via x402 micropayment.

Fetches job listings via a pay-per-call MCP gateway secured by x402 micropayments on Base