fix: resolve HTTP 400 invalid order payload via official py-clob-client-v2 SDK (signature_type=3 / POLY_1271)#5
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… (POLY_1271) Polymarket migrated to CLOB V2 (April 28 2026) with new exchange contracts and an updated EIP-712 schema, breaking the bot's hand-rolled OrderSigner. Replaces the legacy custom signer with the official py-clob-client-v2 SDK, which handles V2 typed-data signing, HMAC L2 auth, and payload construction. Accounts created via the Polymarket web UI follow the deposit-wallet flow: pUSD is held on a smart-contract deposit wallet (the "Solo per uso API" address on the user profile). Orders use signature_type=3 (POLY_1271) with the deposit wallet as funder; the backend validates the ERC-1271-wrapped signature against the contract. - Dependency: py-clob-client -> py-clob-client-v2>=1.0.0 - src/bot.py: connect() derives API credentials via SDK; place_order delegates to sdk_client.create_and_post_order; cancel/get_orders use SDK too - Credential caching (src/bot.py + src/client.py): cached api_creds.json is bound to the safe_address it was derived for; stale creds are auto-purged when the configured funder changes - src/config.py + config/default.yaml: default signature_type=3 - src/signer.py: kept for backward compatibility (no longer used for orders) - strategies/gabagool_strategy.py + src/main.py + src/telegram_notifier.py: hook the new place_order error contract for clearer Telegram alerts Fixes strongca22-cpu#6.
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Description
This PR resolves the
HTTP 400 — Invalid order payloaderrors that occurred when placing orders on the Polymarket CLOB V2.Root cause: the bot manually constructed and signed EIP-712 payloads via a custom
OrderSigner. Polymarket migrated to CLOB V2 (April 28 2026) with new exchange contracts and an updated EIP-712 schema, breaking the custom signer.The legacy custom signing flow has been replaced with the official
py-clob-client-v2Python SDK, which handles EIP-712 typed-data signing, HMAC L2 auth, and payload construction internally.Wallet flow used
Polymarket accounts created via the web UI (MetaMask connection) follow the deposit-wallet flow:
0x0ada…).SignatureTypeV2.POLY_1271(signature_type=3) with the deposit wallet address asfunder.Changes
py-clob-clientwithpy-clob-client-v2>=1.0.0.src/bot.py):connect()derives API credentials via the official SDK;place_order()delegates entirely tosdk_client.create_and_post_order().src/bot.py+src/client.py): cachedapi_creds.jsonis now bound to asafe_addressand auto-invalidated when the configuredfunderchanges, preventing stale credentials from carrying over after a wallet swap.config/default.yaml,src/config.py):signature_type=3(POLY_1271 — deposit-wallet flow).How to migrate
POLY_PRIVATE_KEYandPOLY_SAFE_ADDRESS(deposit wallet shown on Polymarket profile as "Solo per uso API") inconfig/.env.data/api_creds.json.Fixes #6.