EVM & Solana Utility Tools
Keccak Merkle tree and proof builder — generate indexed sorted-pair inclusion proofs with domain separation and explicit odd-node promotion.
InferenceLiveeip155:8453Exactvia cdp
Merkle-proofMerkle-treeKeccak256Proof-generationBlockchain-development
Calls · 30d
2↑ 7.7%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far.
$24.30
Verified settled volume
1,036 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-09-15 06:32Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.01USDC≈ $0.01 USD
on Base · exact scheme
Pay 0.01 USDC on Base to 0x8C12…Df1b2. The signed payment is good for 5 minutes.
- Paid to
- 0x8C12…Df1b2
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 10000 smallest units
10000units
on Polygon · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0x8C12…Df1b2
- Token contract
- 0x3c49…c3359
- Payment window
- 5 minutes
10000units
on Arbitrum · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0x8C12…Df1b2
- Token contract
- 0xaf88…e5831
- Payment window
- 5 minutes
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"tier": "standard",
"version": "2",
"merchant": "x402Atlas"
},
"payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"tier": "standard",
"version": "2",
"merchant": "x402Atlas"
},
"payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
"amount": "10000",
"scheme": "exact",
"network": "eip155:137",
"maxTimeoutSeconds": 300
},
{
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"tier": "standard",
"version": "2",
"merchant": "x402Atlas"
},
"payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
"amount": "10000",
"scheme": "exact",
"network": "eip155:42161",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"leaves": [
"0x616c706861",
"0x62657461",
"0x67616d6d61"
]
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"root": "0x40a0fa2d0ce898ef138c3403645be77705df9d485ecc137b02b35eb9fdeaaf94",
"proofs": [
{
"index": 0,
"steps": [
{
"hash": "0x5b3931176fc5f22736bfc5393315c63244f57e672b5017c675220ec7de504ae6"
},
{
"hash": "0xe51a809d0bd7c39f11aa7f9ff0ba85099028c7d56f42313f3bb5495a7b967146"
}
]
},
{
"index": 1,
"steps": [
{
"hash": "0x180a512e153366b1510bf090b11069c19394ab868093ef5290ead07f1fbb3386"
},
{
"hash": "0xe51a809d0bd7c39f11aa7f9ff0ba85099028c7d56f42313f3bb5495a7b967146"
}
]
},
{
"index": 2,
"steps": [
{
"hash": "0xbfa0350c48ccd55fb3a8315a6d6bfc41877772eaebfcba73cb195984df5b3d32"
}
]
}
],
"warnings": [],
"operation": "merkle-build",
"leaf_count": 3,
"leaf_hashes": [
"0x180a512e153366b1510bf090b11069c19394ab868093ef5290ead07f1fbb3386",
"0x5b3931176fc5f22736bfc5393315c63244f57e672b5017c675220ec7de504ae6",
"0xe51a809d0bd7c39f11aa7f9ff0ba85099028c7d56f42313f3bb5495a7b967146"
],
"algorithm_version": "keccak256-sorted-pairs-v1"
}
}
},
"tags": [
"merkle-proof",
"merkle-tree",
"keccak256",
"proof-generation",
"blockchain-development"
],
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"leaves"
],
"properties": {
"leaves": {
"type": "array",
"items": {
"type": "string",
"pattern": "^0x(?:[0-9a-fA-F]{2})*$",
"maxLength": 8194,
"description": "Zero to 4096 raw bytes as even-length 0x hexadecimal"
},
"maxItems": 1024,
"minItems": 1,
"description": "Raw leaves in stable caller order; duplicate values remain distinct by zero-based index"
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"operation",
"algorithm_version",
"leaf_count",
"root",
"leaf_hashes",
"proofs",
"warnings"
],
"properties": {
"root": {
"type": "string",
"pattern": "^0x[0-9a-f]{64}$",
"description": "Tree root"
},
"_atlas": {
"type": "object",
"required": [
"docs"
],
"properties": {
"docs": {
"type": "string",
"format": "uri",
"maxLength": 512,
"description": "Documentation URL for this bridge"
},
"related": {
"type": "array",
"items": {
"type": "object",
"required": [
"bridge",
"url",
"docs",
"summary"
],
"properties": {
"url": {
"type": "string",
"format": "uri",
"maxLength": 512,
"description": "Related route URL"
},
"docs": {
"type": "string",
"format": "uri",
"maxLength": 512,
"description": "Related bridge documentation URL"
},
"bridge": {
"type": "string",
"maxLength": 64,
"description": "Related bridge name"
},
"summary": {
"type": "string",
"maxLength": 256,
"description": "Short capability summary"
}
},
"description": "One related Atlas route",
"additionalProperties": false
},
"maxItems": 3,
"description": "Bounded related Atlas routes"
}
},
"description": "Atlas documentation and related-route metadata added after deployment",
"additionalProperties": false
},
"proofs": {
"type": "array",
"items": {
"type": "object",
"required": [
"index",
"steps"
],
"properties": {
"index": {
"type": "integer",
"maximum": 1023,
"minimum": 0,
"description": "Zero-based original leaf index"
},
"steps": {
"type": "array",
"items": {
"type": "object",
"required": [
"hash"
],
"properties": {
"hash": {
"type": "string",
"pattern": "^0x[0-9a-f]{64}$",
"description": "Sibling node hash; direction is unnecessary because pairs sort by hash"
}
},
"additionalProperties": false
},
"maxItems": 10,
"description": "Sibling hashes in leaf-to-root order; odd promotions add no step"
}
},
"additionalProperties": false
},
"maxItems": 1024,
"minItems": 1,
"description": "Exactly one proof for every original index"
},
"warnings": {
"type": "array",
"items": {
"type": "string",
"description": "Warning"
},
"maxItems": 0,
"description": "Always empty"
},
"operation": {
"type": "string",
"const": "merkle-build",
"description": "Stable route operation"
},
"leaf_count": {
"type": "integer",
"maximum": 1024,
"minimum": 1,
"description": "Number of original leaves"
},
"leaf_hashes": {
"type": "array",
"items": {
"type": "string",
"pattern": "^0x[0-9a-f]{64}$",
"description": "Leaf hash"
},
"maxItems": 1024,
"minItems": 1,
"description": "Domain-separated leaf hashes in original order"
},
"algorithm_version": {
"type": "string",
"const": "keccak256-sorted-pairs-v1",
"description": "Atlas domain-separated sorted-pair profile"
}
},
"additionalProperties": false
}
}
}
}
},
"category": "utilities"
}
}Provenance
- Seen in the source catalog
- 2026-09-15 06:32Z
- Last indexed by Roundhouse
- 2026-09-24 08:40Z
- Last enriched (probe, favicon, geo)
- 2026-09-20 13:15Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 405
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service EVM & Solana Utility Tools and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=EVM%20%26%20Solana%20Utility%20Tools' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://chain-tools.use.x402atlas.com/merkle/build, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.