The Graph says GraphTally, formerly TAP, has run since early 2025 as its offchain payment layer for Indexers, turning signed per-query receipts into RAV batches that settle on Arbitrum. Active Indexers can serve 500,000+ queries a day, so one onchain payment per query would turn micropayments into a fee sink. Subgraphs now also accept x402 payments in USDC over HTTP, letting agents pay gateways per request while gateways settle Indexers through GraphTally.

TLDR by @Benthic

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