Andreax — pay-per-call AI tools for agents (MCP + x402)

Remote MCP server: https://pagos.andreax.dev/mcp (Streamable HTTP, JSON-RPC)

Andreax is a remote MCP server with 270 pay-per-call tools for AI agents — text, code, documents, audio, web research and on-chain data. There is no signup and no API key: each call is paid individually with x402 in USDC on Base, from $0.001 per call.

• No accounts, no keys. The payment is the authentication.
• Gasless for the payer. EIP-3009 transferWithAuthorization; the settlement gas is paid by Andreax.
• Free preview. Every tool accepts ?sample=1 and returns an example output at no cost.
• Discovery in one request. GET https://pagos.andreax.dev/.well-known/x402.json

This repository only contains the public listing (README + directory metadata). The server itself is hosted; there is nothing to install.

Connect

Claude Desktop / Cursor / any MCP client (via mcp-remote)

{
  "mcpServers": {
    "andreax": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://pagos.andreax.dev/mcp"]
    }
  }
}

Clients with native remote-MCP support

Add a remote server with URL https://pagos.andreax.dev/mcp (transport: Streamable HTTP, auth: none).

JavaScript SDK (handles the x402 payment for you)

npm install @andreax-tools/sdk

How payment works

1. tools/list is free.
2. tools/call without payment returns an x402 v2 challenge: exact amount, network (eip155:8453), asset (USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) and recipient.
3. Your agent signs an EIP-3009 authorization for that amount and retries with it (argument x_payment, or the X-PAYMENT header over HTTP).
4. The result comes back together with the on-chain settlement reference.

Your agent only needs a wallet with a little USDC on Base — no ETH.

Tools (a selection of the most used — tools/list returns all 270)

Tool	What it does	Price (USDC)
compress	Compress a prompt into dense language (20–40% fewer tokens)	0.001
count-tokens	Estimate the token count of a text	0.001
detect-language	Detect a text's language (ISO 639-1)	0.001
summarize	Faithful bullet-point summary	0.003
translate-to	Translate into any target language	0.003
sentiment	Positive / negative / neutral + confidence	0.002
entities	Named-entity recognition as JSON	0.003
classify-topic	Topic classification for routing/tagging	0.002
extract-json	Structured data from free text	0.004
json-fix	Repair malformed JSON	0.002
proofread	Spelling and grammar, same language	0.002
rewrite-formal	Formal, professional rewrite	0.003
moderate	Flag unsafe text	0.002
injection-guard	Detect prompt-injection in text / tool outputs	0.010
text-to-sql	SQL from a natural-language request	0.005
regex	Regular expression from a description	0.020
cron	Cron expression from a schedule in words	0.020
code-review	Bugs, security issues, improvements	0.020
code-gen	Code from a description	0.008
read-url	Clean readable text of a web page	0.002
read-pdf	Text of a PDF from a URL	0.003
ocr	Text from an image or scanned PDF (EN/ES)	0.050
transcribe	Speech-to-text with language detection	0.050
embeddings	Embedding vector for search / RAG	0.001
semantic-search	Rank documents against a query	0.003
research	Web research with cited sources	0.050
fact-check	Verdict + reasoning for a claim	0.030
crypto-price	Live crypto price + 24h change	0.005
wallet-balance	ETH and USDC balance of a Base address	0.002
fx	Currency conversion quote into USDC	0.001
smart-document	OCR → summary → translation, one call	0.100
meeting-minutes	Recording → minutes, decisions, action items	0.040

The live catalog (with the current prices, which are authoritative) is at https://pagos.andreax.dev/api/taller/peaje/catalogo.

Links

• Storefront: https://pagos.andreax.dev/tienda
• x402 discovery: https://pagos.andreax.dev/.well-known/x402.json