Every change Wellknown observed on this MCP server, newest first, with what it was before and what it became. Tool-surface changes carry the definition diff. Nothing here is edited after the fact.
Added "arb_allowance", "arb_call", "arb_estimate_gas" and 36 more (64 tools before, 103 now)
Arbitrum ERC-20 allowance — ERC-20 token allowance on Arbitrum One: how much a spender may move from an owner's wallet (allowance), raw and in token units, and whether the approval is unlimited. Use to check an approval before a swap or to audit risky open approvals; for the owner's balance use arb_token_balance. Token is a ticker (USDC, USDT, WETH…) or a 0x contract; a missing contract is 404 and a non-ERC-20 422, both uncharged. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charged, so repeats are not free.
Arbitrum contract call — Read-only contract call on Arbitrum One (eth_call): send ABI-encoded calldata to a contract at the latest block and get the raw return data, without a transaction or gas. Use to read any view function that has no dedicated tool (the example reads USDC totalSupply, selector 0x18160ddd); decode the result with the function's ABI. Calldata up to 8 KB; a call that reverts is 422 with the reason, uncharged. Example: to=0xaf88d065e77c8cC2239327C5EDb3A432268e5831, data=0x18160ddd. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and ch…
Arbitrum gas estimate — Estimate the gas a transaction would use on Arbitrum One (eth_estimateGas) and what it would cost at the current gas price, in gas units, gwei and ETH. Give to, plus value in ETH and calldata for a contract call, and the sender when the call depends on it. Use before sending a transaction or to price a batch; for the gas price alone use arb_gas. A transaction that would revert is 422 with the reason, uncharged. Example: to=0x000000000000000000000000000000000000dEaD. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes no…
Arbitrum NFT balance — How many NFTs of one ERC-721 collection a wallet holds on Arbitrum One (balanceOf), with the collection's name and symbol. Use to check a holder before a token-gated action or to see whether a wallet still holds a collection; for who holds one token id use arb_nft_owner. Both inputs are 0x addresses; a missing contract is 404, a contract that is not ERC-721 422, both uncharged. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charged, so repeats are not free.
Arbitrum NFT metadata — NFT metadata on Arbitrum One: the token URI of one ERC-721 token id (tokenURI) and the JSON it points to (name, description, image, attributes), read from data: URIs, https or ipfs:// (through ipfs.io). Strings over 1,000 characters, such as on-chain SVG images, are shortened. Use to show or check what an NFT is; for its owner use arb_nft_owner. A token that does not exist is 422, uncharged; unreachable metadata is reported in metadataError. Example: contract=0xC36442b4a4522E871399CD717aBDD847Ab11FE88, tokenId=1. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed c…
Arbitrum NFT owner — Owner of an NFT on Arbitrum One: the wallet that holds one ERC-721 token id right now (ownerOf), plus the collection's name and symbol. Use to verify who holds an NFT before a trade, a mint gate or an airdrop; for how many a wallet holds use arb_nft_balance, for the token's metadata arb_nft_metadata. A missing contract is 404, a token that does not exist 422, both uncharged. Example: contract=0xC36442b4a4522E871399CD717aBDD847Ab11FE88, tokenId=1. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is …
Arbitrum proxy implementation — Find the implementation behind a proxy contract on Arbitrum One: reads the EIP-1967 implementation, beacon and admin slots, EIP-1822 (UUPS), the older OpenZeppelin layout and EIP-1167 minimal-proxy bytecode, and names the kind found. Use before trusting or decoding a contract whose code can be swapped by its admin; for a fuller risk verdict use contract_risk. A malformed address is 400; an address without code is 404, both uncharged. Example: address=0xaf88d065e77c8cC2239327C5EDb3A432268e5831. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or …
Arbitrum storage slot read — Read one raw storage slot of a contract on Arbitrum One (eth_getStorageAt): the 32-byte word, as a number and, when it holds one, as an address. Slot is a decimal index or a 0x 32-byte key (mapping and proxy slots). Use to inspect contract state that has no getter, owners or implementation pointers; for proxies use arb_proxy. A malformed address or slot is rejected with 400, uncharged. Example: address=0xaf88d065e77c8cC2239327C5EDb3A432268e5831. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is c…
Base contract call — Read-only contract call on Base (eth_call): send ABI-encoded calldata to a contract at the latest block and get the raw return data, without a transaction or gas. Use to read any view function that has no dedicated tool (the example reads USDC totalSupply, selector 0x18160ddd); decode the result with the function's ABI. Calldata up to 8 KB; a call that reverts is 422 with the reason, uncharged. Example: to=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, data=0x18160ddd. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes no…
Base gas estimate — Estimate the gas a transaction would use on Base (eth_estimateGas) and what it would cost at the current gas price, in gas units, gwei and ETH. Give to, plus value in ETH and calldata for a contract call, and the sender when the call depends on it. Use before sending a transaction or to price a batch; for the gas price alone use base_gas. A transaction that would revert is 422 with the reason, uncharged. Example: to=0x000000000000000000000000000000000000dEaD. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; …
Base NFT balance — How many NFTs of one ERC-721 collection a wallet holds on Base (balanceOf), with the collection's name and symbol. Use to check a holder before a token-gated action or to see whether a wallet still holds a collection; for who holds one token id use base_nft_owner. Both inputs are 0x addresses; a missing contract is 404, a contract that is not ERC-721 422, both uncharged. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charged, so repeats are not free.
Base NFT metadata — NFT metadata on Base: the token URI of one ERC-721 token id (tokenURI) and the JSON it points to (name, description, image, attributes), read from data: URIs, https or ipfs:// (through ipfs.io). Strings over 1,000 characters, such as on-chain SVG images, are shortened. Use to show or check what an NFT is; for its owner use base_nft_owner. A token that does not exist is 422, uncharged; unreachable metadata is reported in metadataError. Example: contract=0x03a520b32C04BF3bEEf7BEb72E919cf822Ed34f1, tokenId=1. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls fr…
Base NFT owner — Owner of an NFT on Base: the wallet that holds one ERC-721 token id right now (ownerOf), plus the collection's name and symbol. Use to verify who holds an NFT before a trade, a mint gate or an airdrop; for how many a wallet holds use base_nft_balance, for the token's metadata base_nft_metadata. A missing contract is 404, a token that does not exist 422, both uncharged. Example: contract=0x03a520b32C04BF3bEEf7BEb72E919cf822Ed34f1, tokenId=1. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charge…
Base proxy implementation — Find the implementation behind a proxy contract on Base: reads the EIP-1967 implementation, beacon and admin slots, EIP-1822 (UUPS), the older OpenZeppelin layout and EIP-1167 minimal-proxy bytecode, and names the kind found. Use before trusting or decoding a contract whose code can be swapped by its admin; for a fuller risk verdict use contract_risk. A malformed address is 400; an address without code is 404, both uncharged. Example: address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes…
Base storage slot read — Read one raw storage slot of a contract on Base (eth_getStorageAt): the 32-byte word, as a number and, when it holds one, as an address. Slot is a decimal index or a 0x 32-byte key (mapping and proxy slots). Use to inspect contract state that has no getter, owners or implementation pointers; for proxies use base_proxy. A malformed address or slot is rejected with 400, uncharged. Example: address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charged,…
Ethereum ERC-20 allowance — ERC-20 token allowance on Ethereum: how much a spender may move from an owner's wallet (allowance), raw and in token units, and whether the approval is unlimited. Use to check an approval before a swap or to audit risky open approvals; for the owner's balance use eth_token_balance. Token is a ticker (USDC, USDT, WETH…) or a 0x contract; a missing contract is 404 and a non-ERC-20 422, both uncharged. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charged, so repeats are not free.
Ethereum contract call — Read-only contract call on Ethereum (eth_call): send ABI-encoded calldata to a contract at the latest block and get the raw return data, without a transaction or gas. Use to read any view function that has no dedicated tool (the example reads USDC totalSupply, selector 0x18160ddd); decode the result with the function's ABI. Calldata up to 8 KB; a call that reverts is 422 with the reason, uncharged. Example: to=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48, data=0x18160ddd. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and change…
Ethereum gas estimate — Estimate the gas a transaction would use on Ethereum (eth_estimateGas) and what it would cost at the current gas price, in gas units, gwei and ETH. Give to, plus value in ETH and calldata for a contract call, and the sender when the call depends on it. Use before sending a transaction or to price a batch; for the gas price alone use eth_gas. A transaction that would revert is 422 with the reason, uncharged. Example: to=0x000000000000000000000000000000000000dEaD. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothin…
Ethereum NFT balance — How many NFTs of one ERC-721 collection a wallet holds on Ethereum (balanceOf), with the collection's name and symbol. Use to check a holder before a token-gated action or to see whether a wallet still holds a collection; for who holds one token id use eth_nft_owner. Both inputs are 0x addresses; a missing contract is 404, a contract that is not ERC-721 422, both uncharged. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charged, so repeats are not free.
Ethereum NFT metadata — NFT metadata on Ethereum: the token URI of one ERC-721 token id (tokenURI) and the JSON it points to (name, description, image, attributes), read from data: URIs, https or ipfs:// (through ipfs.io). Strings over 1,000 characters, such as on-chain SVG images, are shortened. Use to show or check what an NFT is; for its owner use eth_nft_owner. A token that does not exist is 422, uncharged; unreachable metadata is reported in metadataError. Example: contract=0xC36442b4a4522E871399CD717aBDD847Ab11FE88, tokenId=1. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls…
Ethereum NFT owner — Owner of an NFT on Ethereum: the wallet that holds one ERC-721 token id right now (ownerOf), plus the collection's name and symbol. Use to verify who holds an NFT before a trade, a mint gate or an airdrop; for how many a wallet holds use eth_nft_balance, for the token's metadata eth_nft_metadata. A missing contract is 404, a token that does not exist 422, both uncharged. Example: contract=0xC36442b4a4522E871399CD717aBDD847Ab11FE88, tokenId=1. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is char…
Ethereum proxy implementation — Find the implementation behind a proxy contract on Ethereum: reads the EIP-1967 implementation, beacon and admin slots, EIP-1822 (UUPS), the older OpenZeppelin layout and EIP-1167 minimal-proxy bytecode, and names the kind found. Use before trusting or decoding a contract whose code can be swapped by its admin; for a fuller risk verdict use contract_risk. A malformed address is 400; an address without code is 404, both uncharged. Example: address=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or comp…
Ethereum storage slot read — Read one raw storage slot of a contract on Ethereum (eth_getStorageAt): the 32-byte word, as a number and, when it holds one, as an address. Slot is a decimal index or a 0x 32-byte key (mapping and proxy slots). Use to inspect contract state that has no getter, owners or implementation pointers; for proxies use eth_proxy. A malformed address or slot is rejected with 400, uncharged. Example: address=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charg…
Optimism ERC-20 allowance — ERC-20 token allowance on Optimism: how much a spender may move from an owner's wallet (allowance), raw and in token units, and whether the approval is unlimited. Use to check an approval before a swap or to audit risky open approvals; for the owner's balance use op_token_balance. Token is a ticker (USDC, USDT, WETH…) or a 0x contract; a missing contract is 404 and a non-ERC-20 422, both uncharged. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charged, so repeats are not free.
Optimism contract call — Read-only contract call on Optimism (eth_call): send ABI-encoded calldata to a contract at the latest block and get the raw return data, without a transaction or gas. Use to read any view function that has no dedicated tool (the example reads USDC totalSupply, selector 0x18160ddd); decode the result with the function's ABI. Calldata up to 8 KB; a call that reverts is 422 with the reason, uncharged. Example: to=0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85, data=0x18160ddd. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and change…
Optimism gas estimate — Estimate the gas a transaction would use on Optimism (eth_estimateGas) and what it would cost at the current gas price, in gas units, gwei and ETH. Give to, plus value in ETH and calldata for a contract call, and the sender when the call depends on it. Use before sending a transaction or to price a batch; for the gas price alone use op_gas. A transaction that would revert is 422 with the reason, uncharged. Example: to=0x000000000000000000000000000000000000dEaD. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing…
Optimism NFT balance — How many NFTs of one ERC-721 collection a wallet holds on Optimism (balanceOf), with the collection's name and symbol. Use to check a holder before a token-gated action or to see whether a wallet still holds a collection; for who holds one token id use op_nft_owner. Both inputs are 0x addresses; a missing contract is 404, a contract that is not ERC-721 422, both uncharged. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charged, so repeats are not free.
Optimism NFT metadata — NFT metadata on Optimism: the token URI of one ERC-721 token id (tokenURI) and the JSON it points to (name, description, image, attributes), read from data: URIs, https or ipfs:// (through ipfs.io). Strings over 1,000 characters, such as on-chain SVG images, are shortened. Use to show or check what an NFT is; for its owner use op_nft_owner. A token that does not exist is 422, uncharged; unreachable metadata is reported in metadataError. Example: contract=0xC36442b4a4522E871399CD717aBDD847Ab11FE88, tokenId=1. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls …
Optimism NFT owner — Owner of an NFT on Optimism: the wallet that holds one ERC-721 token id right now (ownerOf), plus the collection's name and symbol. Use to verify who holds an NFT before a trade, a mint gate or an airdrop; for how many a wallet holds use op_nft_balance, for the token's metadata op_nft_metadata. A missing contract is 404, a token that does not exist 422, both uncharged. Example: contract=0xC36442b4a4522E871399CD717aBDD847Ab11FE88, tokenId=1. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charge…
Optimism proxy implementation — Find the implementation behind a proxy contract on Optimism: reads the EIP-1967 implementation, beacon and admin slots, EIP-1822 (UUPS), the older OpenZeppelin layout and EIP-1167 minimal-proxy bytecode, and names the kind found. Use before trusting or decoding a contract whose code can be swapped by its admin; for a fuller risk verdict use contract_risk. A malformed address is 400; an address without code is 404, both uncharged. Example: address=0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or comp…
Optimism storage slot read — Read one raw storage slot of a contract on Optimism (eth_getStorageAt): the 32-byte word, as a number and, when it holds one, as an address. Slot is a decimal index or a 0x 32-byte key (mapping and proxy slots). Use to inspect contract state that has no getter, owners or implementation pointers; for proxies use op_proxy. A malformed address or slot is rejected with 400, uncharged. Example: address=0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charge…
Polygon ERC-20 allowance — ERC-20 token allowance on Polygon PoS: how much a spender may move from an owner's wallet (allowance), raw and in token units, and whether the approval is unlimited. Use to check an approval before a swap or to audit risky open approvals; for the owner's balance use polygon_token_balance. Token is a ticker (USDC, USDT, WETH…) or a 0x contract; a missing contract is 404 and a non-ERC-20 422, both uncharged. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charged, so repeats are not free.
Polygon contract call — Read-only contract call on Polygon PoS (eth_call): send ABI-encoded calldata to a contract at the latest block and get the raw return data, without a transaction or gas. Use to read any view function that has no dedicated tool (the example reads USDC totalSupply, selector 0x18160ddd); decode the result with the function's ABI. Calldata up to 8 KB; a call that reverts is 422 with the reason, uncharged. Example: to=0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359, data=0x18160ddd. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and cha…
Polygon gas estimate — Estimate the gas a transaction would use on Polygon PoS (eth_estimateGas) and what it would cost at the current gas price, in gas units, gwei and POL. Give to, plus value in POL and calldata for a contract call, and the sender when the call depends on it. Use before sending a transaction or to price a batch; for the gas price alone use polygon_gas. A transaction that would revert is 422 with the reason, uncharged. Example: to=0x000000000000000000000000000000000000dEaD. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes…
Polygon NFT balance — How many NFTs of one ERC-721 collection a wallet holds on Polygon PoS (balanceOf), with the collection's name and symbol. Use to check a holder before a token-gated action or to see whether a wallet still holds a collection; for who holds one token id use polygon_nft_owner. Both inputs are 0x addresses; a missing contract is 404, a contract that is not ERC-721 422, both uncharged. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call is charged, so repeats are not free.
Polygon NFT metadata — NFT metadata on Polygon PoS: the token URI of one ERC-721 token id (tokenURI) and the JSON it points to (name, description, image, attributes), read from data: URIs, https or ipfs:// (through ipfs.io). Strings over 1,000 characters, such as on-chain SVG images, are shortened. Use to show or check what an NFT is; for its owner use polygon_nft_owner. A token that does not exist is 422, uncharged; unreachable metadata is reported in metadataError. Example: contract=0xC36442b4a4522E871399CD717aBDD847Ab11FE88, tokenId=1. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; faile…
Polygon NFT owner — Owner of an NFT on Polygon PoS: the wallet that holds one ERC-721 token id right now (ownerOf), plus the collection's name and symbol. Use to verify who holds an NFT before a trade, a mint gate or an airdrop; for how many a wallet holds use polygon_nft_balance, for the token's metadata polygon_nft_metadata. A missing contract is 404, a token that does not exist 422, both uncharged. Example: contract=0xC36442b4a4522E871399CD717aBDD847Ab11FE88, tokenId=1. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each c…
Polygon proxy implementation — Find the implementation behind a proxy contract on Polygon PoS: reads the EIP-1967 implementation, beacon and admin slots, EIP-1822 (UUPS), the older OpenZeppelin layout and EIP-1167 minimal-proxy bytecode, and names the kind found. Use before trusting or decoding a contract whose code can be swapped by its admin; for a fuller risk verdict use contract_risk. A malformed address is 400; an address without code is 404, both uncharged. Example: address=0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or c…
Polygon storage slot read — Read one raw storage slot of a contract on Polygon PoS (eth_getStorageAt): the 32-byte word, as a number and, when it holds one, as an address. Slot is a decimal index or a 0x 32-byte key (mapping and proxy slots). Use to inspect contract state that has no getter, owners or implementation pointers; for proxies use polygon_proxy. A malformed address or slot is rejected with 400, uncharged. Example: address=0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359. Price $0.01/call via x402 USDC or a card key (/credits), first 25 free; failed calls free. Reads or computes only and changes nothing; each call i…
Certificate recorded, valid to 2027-01-07
Authorization not required
Changed the definition of "wallet_balances"
Wallet balance, USDC balance: native and USDC balances on 5 networks
⟨5 unchanged words⟩ true,"readOnlyHint":true,"title":"Wallet balance, USDC balance: native and USDC balances on 5 networks"}
Unknown → Live
First tool surface recorded: 64 tools (server version 1.50.2)
https://agent-data-tools.revmesh2074.workers.dev/mcp/chain (mcp_streamable_http) — from mcp_registry, with the record
Showing the latest 7 events. The API returns up to 500 and filters by kind: ?kind=tool_surface_changed