algorand-x402-client

Query Algorand Indexer with the official py-algorand-sdk / AlgoKit client. This package does not add a new query API. It only changes where the HTTP goes, and whether that request can pay.

You call the same methods as always (account_info(), search_transactions(), pagination helpers). Under the hood the official IndexerClient is pointed at one of two transports:

1. .free — send the request to Nodely. No payment headers, no USDC.
2. .paid — send the same path to the x402 gateway. If the gateway replies HTTP 402, the client signs a USDC payment (capped), retries once with a payment signature, and returns the Indexer JSON.

Both backends speak vanilla Indexer REST and retain history from genesis. They differ by billing and rate limits, not by how far back data goes. There is no silent “try Nodely, then pay” fallback — a free-tier 429 would otherwise spend USDC.

Install

Python 3.10+:

pip install algorand-x402-client
# or: uv add algorand-x402-client

Usage

import os

from algorand_x402_client import Payer, configure_logging, create_algorand_indexer, get_logger

configure_logging()  # stderr + algorand-x402-client.log
logger = get_logger(__name__)
indexer_client = create_algorand_indexer(
    "mainnet",
    payer=Payer(mnemonic=os.environ["BUYER_MNEMONIC"]),  # omit for free-only
)

# Nodely — never sends PAYMENT-SIGNATURE, never spends USDC
account = indexer_client.free.account_info("JRG3CUVOFK3YJK3QDD4IOWKMHHRCWVTEMUSYKDN7U73FQO5ZYTCC7CEBRQ")

# x402 gateway — HTTP 402 → sign USDC → retry (search tier is $0.0001)
paid = indexer_client.paid.account_info("JRG3CUVOFK3YJK3QDD4IOWKMHHRCWVTEMUSYKDN7U73FQO5ZYTCC7CEBRQ")

logger.info("gateway network=%s", indexer_client.gateway.health()["network"])
indexer_client.close()

indexer_client.free / indexer_client.paid are py-algorand-sdk IndexerClients. indexer_client.algorand_free is AlgorandClient.from_clients with Nodely algod

• the free Indexer.

Payer must be opted into USDC: MainNet 31566704, TestNet 10458941. Default max payment is 10_000 microUSDC ($0.01).

Environment: BUYER_MNEMONIC, X402_BASE_URL, X402_NETWORK, ALGORAND_X402_LOG_FILE.

How the HTTP layer is swapped

py-algorand-sdk’s IndexerClient has no session hook, so this library subclasses it (SessionIndexerClient) and sends every call through a requests.Session.

• Free session — plain requests, plus backoff on HTTP 429.
• Paid session — the same session wrapped with x402-avm wrapRequestsWithPayment. The wrapper owns the 402 → sign → retry loop. Suggested params for the payment group come from Nodely algod, not from the Indexer.

You still get official response types. Only the transport is ours.

Docs

• Repository: https://github.com/thecryptomie/algorand-x402-client
• Gateway health: https://api.algorand-indexer.xyz/health
• OpenAPI: https://api.algorand-indexer.xyz/openapi.json