Read-only Base and Ethereum chain data over x402
Read-only Base and Ethereum chain data over x402: gas, blocks, balances, token metadata, tx status, nonces, and token safety verdicts scored 0-100. Batch up to 25 tokens. Free /scan and /t/<address> verdict pages.
Answeringour last check, 2026-10-31
1 of 1checks answered this week
863 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.firstmention.uk/s/chainread/batch
| Category | Market data |
|---|---|
| Provider host | api.firstmention.uk |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-31 | valid payment request | 402 | $0.01 | 863 ms |
Example input (from the provider)
{
"body": {
"addresses": [
"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"0x4200000000000000000000000000000000000006"
],
"chain": "base"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"address": {
"description": "0x address or ERC-20 contract address",
"type": "string"
},
"addresses": {
"description": "Up to 25 addresses (for /batch)",
"items": {
"type": "string"
},
"type": "array"
},
"chain": {
"enum": [
"base",
"ethereum"
],
"type": "string"
},
"hash": {
"description": "0x transaction hash (for /tx)",
"type": "string"
},
"number": {
"description": "Block number or 'latest' (for /block)",
"type": "string"
}
},
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"headers": {
"additionalProperties": {
"type": "string"
},
"type": "object"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"queryParams": {
"additionalProperties": {
"type": "string"
},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"_meta": {
"properties": {
"payer": {
"type": "string"
},
"price_usd": {
"type": "number"
}
},
"type": "object"
},
"address": {
"type": "string"
},
"chain": {
"type": "string"
},
"flags": {
"items": {
"properties": {
"code": {
"type": "string"
},
"severity": {
"type": "string"
}
},
"type": "object"
},
"type": "array"
},
"risk": {
"type": "string"
},
"score": {
"type": "number"
},
"verdict": {
"type": "string"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}