2sio 0.3.0

Python client for 2s.io — ever-expanding catalog of pay-per-call AI agent APIs on Base via x402.

2sio (Python)

Python client for 2s.io — an ever-expanding catalog of pay-per-call AI agent APIs on Base via x402.

pip install 2sio

Quick start

import os
from twosio import TwoS

# private_key is an EVM key (0x...) holding USDC on Base mainnet.
client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])

r = client.patents.search(q="neural network", limit=5)
print(r.data["hits"][0]["title"])
print("paid:", r.cost_usd, "USDC, tx:", r.settlement["tx_hash"])

Settles on Base mainnet in ~2 seconds. Prices start at $0.001/call.

If you'd rather construct the signer yourself (e.g. for a custodial KMS-backed wallet), pass it directly:

from eth_account import Account
signer = Account.from_key(os.environ["EVM_PRIVATE_KEY"])
client = TwoS(signer=signer)

What's included

An ever-expanding catalog of endpoints, namespaced by group:

client.patents.search(q="...")
client.patents.detail(applicationNumber="18566276")
client.crypto.address_validate(chain="eth", address="0xd8dA...")
client.ai.summarize(url="https://example.com")
client.law.sanctions_check(name="John Smith")
client.geocode.address(query="350 5th Ave, New York, NY")
client.weather.zip(zip="94103")
# ... and more

Full catalog: https://2s.io/api/directory. OpenAPI: https://2s.io/api/openapi.

Safety

• The client refuses to sign payments above max_price_usd (default $0.10).
• Optional on_payment_requested hook for per-call approval.

client = TwoS(
    private_key=os.environ["EVM_PRIVATE_KEY"],
    max_price_usd=0.05,
    on_payment_requested=lambda info: info["amount_usd"] < 0.02,
)

Errors

• TwoSError — HTTP error from 2s.io.
• PaymentRefusedError — local refusal (price cap or hook).

License

MIT.