feat: Circle v2 strategies + v1-vs-v2 benches (industry-default → Helix discovery) - #6
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…acing Industry-default serialize_and_backoff loses 24% of transfers under sustained load (Bench 2.1: 20-concurrent × 5 trials on Arc Testnet, 24 of 100 transfers permanently lost when retries hit the same rate limit in parallel). chunk_concurrent paces requests under Circle's per-wallet concurrency threshold (default chunk_size=4, inter-chunk pause=1500ms, with adaptive shrink on observed 429s). Zero rate-limit triggered across 100 sustained-load attempts. Tradeoff: 53% slower wall-clock vs serialize_and_backoff (7300ms vs 4760ms in the bench), in exchange for 100% reliability vs 76%. Standalone module — does NOT integrate with PCEC engine in this PR. Gene Map multi-strategy support is PR #4 (post-grant work).
…ecovery Industry-default 4xx-no-retry is over-conservative: Bench 2.2 shows 80% of Circle param errors are deterministic and auto-fixable (idempotencyKey strip, amount type coercion, address normalization, fee injection, tokenId refresh). v1 hold_and_notify routed all 100 attempts to human review (0% auto-fix). v2 routes by errors[0].location/message and achieves 80/100 (80%) auto-fix rate, falling back to hold_and_notify only for non-deterministic cases (UUID format errors). Two-function API: smartParamRepair(error) -> ParamRepairAction, plus applyParamRepair(args, action) for arg mutation. 8 action types, TypeScript exhaustive switch.
…ta verification
Generalizes v1 override_api_decimals to check all token metadata fields,
not just decimals. Bench 2.3 shows v1 misses symbol drift entirely
(USDC vs USDC.e silent substitution), creating fund-safety risk for
agents. v2 verifies decimals + symbol + contract address via on-chain
reads (ERC-20) or ground-truth table (native USDC), with audit-log
source attribution ('on-chain' vs 'ground-truth-table' vs 'api-trusted').
Cache layer for repeated verification of the same token. NATIVE_USDC_DECIMALS
table covers Arc, Base, Avalanche, Ethereum (all 6 decimals).
Three bench scripts comparing Helix v1 strategies against v2: - v1-vs-v2-rate-limit.ts: 20-concurrent × 5 trials on Arc Testnet - v1-vs-v2-param-repair.ts: 100 attempts, 5 synthetic Circle error shapes - v1-vs-v2-metadata-trust.ts: 4 scenarios × 50 iterations All bench data saved to scripts/circle-bench/results/ as JSON.
JSON results files for the three v1-vs-v2 benches. Includes v1-serialize-and-backoff-anomaly.md documenting the sustained-load anomaly discovered during Bench 2.1: v1's 5 retries fire concurrently and re-trigger the rate limit, losing 24% of transfers. Marked for fix in PR #4 alongside Gene Map multi-strategy.
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Circle v2 Strategies — PR #3
Follow-up to merged PR #1 (Circle Foundation) and PR #2 (Experimental Capsules). Adds 3 new v2 strategies as standalone modules + 3 v1-vs-v2 comparison benches. Reveals that industry-default approaches have limitations Helix can discover and address through systematic experimentation.
Headline Results
serialize_and_backoff— 76% success, 24/100 lostchunk_concurrent— 100% success, 0 losthold_and_notify— 0% auto-fixsmart_param_repair— 80% auto-fixoverride_api_decimals— decimals onlymetadata-trust-on-chain— decimals + symbol + audit-sourceReal data, real Arc Testnet, JSON in
scripts/circle-bench/results/.Anomaly Discovered
Bench 2.1 revealed v1
serialize_and_backoffhas a sustained-load limitation: its 5 retries also fire concurrently and re-trigger the rate limit, losing 24% of transfers. This is documented inscripts/circle-bench/results/v1-serialize-and-backoff-anomaly.mdand marked for fix in PR #4 (Gene Map multi-strategy support).Code Delivered
3 standalone v2 strategies (not yet integrated into PCEC engine — Gene Map multi-strategy is PR #4):
packages/core/src/strategies/circle-v2/chunk-concurrent.ts(100 lines)packages/core/src/strategies/circle-v2/smart-param-repair.ts(255 lines)packages/core/src/strategies/circle-v2/metadata-trust.ts(207 lines)3 bench scripts for v1-vs-v2 comparison:
scripts/circle-bench/v1-vs-v2-rate-limit.tsscripts/circle-bench/v1-vs-v2-param-repair.tsscripts/circle-bench/v1-vs-v2-metadata-trust.ts3 JSON result files + anomaly doc in
scripts/circle-bench/results/Test Coverage
53 new tests added. Full suite: 623/623 passing. No regressions.
Scope Boundaries (intentional)
v2 strategies are validated standalone via bench. They become first-class Gene Map citizens in PR #4 with proper Thompson Sampling between v1/v2 alternatives.
Roadmap (estimated)
PR feat: Circle experimental capsules — decimals & stale_quote (2 of 2) #4 (3-6 months post-grant) — Gene Map schema migration for multi-strategy support, row-level Thompson Sampling, parallel v1/v2 evaluation, automatic strategy selection by observed traffic pattern.
PR feat: Circle experimental capsules — decimals & stale_quote #5 (6-9 months post-grant) — Auto-generated strategy proposal via LLM scaffolding, automated bench harness, self-improving repair vocabulary. Reduces dependence on human engineers to spec each new strategy.
See Section 9 of the walkthrough document for full self-improving roadmap.
Verification