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Get Started Free →blockrunai/rpc
Use when the user needs raw blockchain JSON-RPC access — contract reads (eth_call), native balances, blocks, transactions, logs, gas estimates, or any chain-native RPC method across 40 chains. One endpoint per chain via BlockRun's Tatum-backed gateway, $0.0040 per call, no node, no API key. Prefer blockrun_price / blockrun_dex / blockrun_surf when they already cover the question.
Passed 14 of 17 test cases with the skill, and 5 of 17 without it.
and 15 more in the full report
14 fixed5 passed either way2 still failing2 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.
Which string identifier represents zkSync Era when calling the multi-chain gateway endpoint?
| Checked | Without skill | With skill |
|---|---|---|
| Selects network parameter zksync. | Missed | Passed |
The instructions your model reads when the skill loads.
blockrun_rpc POSTs a standard JSON-RPC 2.0 body to /v1/rpc/{network}. Flat $0.0030 per call ($0.002 base + the $0.001 transaction fee). A JSON-RPC batch array charges per element but pays the flat fee only once — $0.002 × n + $0.001, so a batch of 3 costs $0.0070 where three separate calls cost $0.0090. Batch whenever you can. Settlement in USDC via x402. Responses are cached briefly server-side for identical read calls (X-Cache: HIT is free of upstream latency but still billed).
| Question | Tool |
|---|---|
| "What's ETH trading at?" | blockrun_price (free) |
| "PEPE/WETH pool liquidity?" | blockrun_dex (free) |
| "What's this wallet holding?" | blockrun_rpc (labels: no tool since Surf was retired 2026-09-06) |
"Call balanceOf(0x...) on this ERC-20" | blockrun_rpc |
| "Latest block / tx receipt / event logs / gas price" | blockrun_rpc |
| "Solana account info / slot / signatures" | blockrun_rpc |
EVM (use eth_* methods):
| Key | Chain | Key | Chain | |
|---|---|---|---|---|
ethereum | Ethereum | zksync | zkSync Era | |
base | Base | berachain | Berachain | |
arbitrum | Arbitrum One | unichain | Unichain | |
arbitrum-nova | Arbitrum Nova | monad | Monad | |
optimism | Optimism | chiliz | Chiliz | |
polygon | Polygon | moonbeam | Moonbeam | |
bsc | BNB Smart Chain | aurora | Aurora | |
avalanche | Avalanche C-Chain | flare | Flare | |
fantom | Fantom | oasis | Oasis Sapphire | |
cronos | Cronos | kaia | Kaia (Klaytn) | |
celo | Celo | sonic | Sonic | |
gnosis | Gnosis | xdc | XDC Network | |
abstract | Abstract | hyperevm | HyperEVM | |
plume | Plume | ronin | Ronin | |
rootstock | Rootstock (RSK) |
Non-EVM (chain-native methods):
| Key | Chain | Method family |
test cases passed, vs 5 / 17 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.