Prism MCP

sample_rpc

sample_rpc

Read-onlyIdempotent

A free sample of the nodes call_rpc uses, to check them before you pay. No wallet. Eight read-only methods: eth_chainId, eth_blockNumber, eth_gasPrice, net_version, web3_clientVersion, net_peerCount, eth_syncing, txpool_status. For any other method, call_rpc. 60 calls an hour per network address, per tool. Example: {"chain":"base","method":"eth_blockNumber"}

Input Schema

TableJSON Schema

Name	Required	Description	Default
`chain`	No	optional string — which node: eth or base. Default base.
`method`	No	optional string — one of eth_chainId, eth_blockNumber, eth_gasPrice, net_version, web3_clientVersion, net_peerCount, eth_syncing, txpool_status; default eth_blockNumber

Output Schema

TableJSON Schema

Name	Required	Description	Default
`chain`	No
`error`	No
`method`	No
`verify`	No
`refused`	No
`paid_tool`	No
`free_sample`	No
`http_status`	No
`rpc_response`	No
`sample_methods`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 8, 2026

removedInput schema / properties / method / enum

Removed value: -[
-  "eth_chainId",
-  "eth_blockNumber",
-  "eth_gasPrice",
-  "net_version",
-  "web3_clientVersion",
-  "net_peerCount",
-  "eth_syncing",
-  "txpool_status"
-]

Changed2 schema fields changedOct 6, 2026

addedInput schema / properties / chain / enum
```
Added value: +[
+  "base",
+  "eth"
+]
```

addedInput schema / properties / method / enum

Added value: +[
+  "eth_chainId",
+  "eth_blockNumber",
+  "eth_gasPrice",
+  "net_version",
+  "web3_clientVersion",
+  "net_peerCount",
+  "eth_syncing",
+  "txpool_status"
+]

Changed1 schema field changedOct 5, 2026

addedOutput schema / properties / sample_methods

Added value: +{
+  "anyOf": [
+    {
+      "description": "on a refusal: the methods the free sample serves",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

Changed1 schema field changedOct 1, 2026

removedInput schema / properties / line

Removed value: -{
-  "description": "optional — your /pay credential: served off your line, not counted against the free ceiling; without it, or with a line that is off or out of time, free and counted.",
-  "type": "string"
-}

Changed1 schema field changedSep 18, 2026

changedInput schema / properties / line / description

Previous value: -"optional — your /pay credential: served off your line, not counted against the free ceiling; without it, free and counted."New value: +"optional — your /pay credential: served off your line, not counted against the free ceiling; without it, or with a line that is off or out of time, free and counted."

AddedSep 18, 2026

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