x402.freeq.one

Pay-per-call MCP.No accounts. No logins. No keys.

20 tools on Base via the Coinbase CDP x402 facilitator. Agents pay per request in USDC — settled on-chain in seconds. No API keys to provision, no subscriptions to manage.

How it works

The x402 protocol turns HTTP 402 Payment Required into an onchain payment flow.

1

Agent reads metadata

GET the endpoint. Receive an OpenAPI spec + x402 payment details (payTo, amount, asset, network).

2

Sees 402 response

Server returns HTTP 402 with a signed payment requirement in USDC on Base or Solana.

3

Signs & pays onchain

Agent wallet broadcasts a USDC microtransaction on Base. No human needed, no account to create.

4

Gets the result

Server verifies the payment header and returns the API response. Done.

All APIs

Each tool is a standalone paid endpoint. Browse the catalog — click any card for details.

markdown $0.001

Fetch a URL and convert its main content to clean, LLM-ready Markdown. Strips nav/ads/sidebars.

POST Details →

token_price $0.002

Get the live price of a token by symbol (e.g. ETH, USDC, MATIC).

GET Details →

wallet_portfolio $0.002

Get a complete wallet portfolio: native ETH balance, ERC-20 balances, NFT holdings, recent transfers.

POST Details →

whale_alerts $0.002

Scan recent blocks for large ETH transfers involving an address. Filter by direction and threshold.

POST Details →

cross_chain_balance $0.002

Aggregate native balance and token/NFT counts for an address across eth, arb, base, polygon, opt.

POST Details →

changelog_openapi $0.005

Diff two OpenAPI specs and generate a structured breaking-change changelog. Deterministic, no LLM.

POST Details →

changelog_git $0.005

Diff git commits and generate a structured breaking-change changelog. Provide repo URL + base commit.

POST Details →

mermaid $0.005

Render a Mermaid diagram to an image (PNG or SVG). Returns base64-encoded image.

POST Details →

html_to_markdown $0.001

Convert an HTML string to clean, LLM-ready Markdown. Handles headings, links, tables, code blocks.

POST Details →

qr_generator $0.001

Generate a QR code or barcode as an image (SVG or PNG). QR, Code128, EAN, UPC, ISBN, and more.

GET Details →

og_image_generator $0.001

Generate an Open Graph social-card image (1200x630 PNG) from a title and description.

GET Details →

jobs $0.002

Search live job postings by keywords and locations. Returns structured results: title, company, location, salary, and more.

POST Details →

verify_semaphore $0.001

Verify a Semaphore ZK proof locally using Groth16 (embedded official vkey). No external dependency — pure on-device verification.

POST Details →

verify_worldid $0.005

Verify a World ID 4.0 proof via the Worldcoin Developer Portal API. Generates RP signature, proxies to Worldcoin, returns nullifier + validity.

POST Details →

verify_batch $0.005

Batch verify up to 10 Semaphore proofs in a single request. Returns per-proof results with timing stats.

POST Details →

wallet_verify_siwe $0.001

Verify a Sign-In-With-Ethereum (EIP-4361) signature as a paid oracle: returns wallet address + chainId, mints nothing.

POST Details →

wallet_verify_nostr $0.001

Verify a NIP-98 Nostr HTTP auth event with replay protection (each event id verifies once). Returns the signer pubkey.

POST Details →

wallet_verify_solana $0.001

Verify an ed25519 Solana wallet signature over a nonce-bearing message. One verification per nonce; returns signer pubkey.

POST Details →

wallet_checksum $0.001

Convert an Ethereum address to its EIP-55 checksummed form — required on SIWE message line 2 before signing.

POST Details →

llm_chat $0.001

Chat with a language model. OpenAI-compatible /v1/chat/completions. 50+ models — free (auto, eco, premium) are $0, paid models at cost.

POST Details →