AllowanceGuard
Deterministic pre-approval allowance checks for Base agents, paid per call.
DataLiveeip155:8453Exactvia cdp
AllowanceApproveRevokeerc20Permit2
Calls · 30d
8
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 5 snapshots so far.
$6.96
Verified settled volume
503 settlements proven x402 by their on-chain EIP-3009 marker.
$0.015
Listed price
As published in the catalog. Always read the live 402 before paying.
9
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-09-24 07:39Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x9876af0F6D8Ed5155Cd02d1ca56D128601612690The 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.
0.015USDC≈ $0.015 USD
on Base · exact scheme
Pay 0.015 USDC on Base to 0x9876…12690. The signed payment is good for 1 minute.
- Paid to
- 0x9876…12690
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 15000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x9876af0F6D8Ed5155Cd02d1ca56D128601612690",
"amount": "15000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"calldata": {
"to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"data": "0x095ea7b30000000000000000000000002626664c2603336e57b271c5c0b26f421741e4810000000000000000000000000000000000000000000000000000000000000000",
"from": "0x9F2C5E4A8db1C3a7E6B0d4f8C1E2a5b7D9C0e3F4"
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"ok": true,
"result": {
"rpc": {
"endpoints": [],
"reachable": null,
"configured": false
},
"chain": "eip155:8453",
"delta": {
"detail": "this sets the allowance to zero, which cannot increase exposure whatever it is now; the value being replaced could not be read, so whether it is a reduction or already zero is unknown",
"direction": "unknown",
"difference": null,
"increases_exposure": false
},
"token": {
"detail": "no RPC configured, so code presence could not be read; no RPC configured, so token metadata could not be read",
"symbol": null,
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"decimals": null,
"has_code": null,
"code_size": null,
"is_erc721": null,
"total_supply": null
},
"decode": {
"source": "bundled-abi",
"selector": "0x095ea7b3",
"signature": "approve(address,uint256)",
"candidates": []
},
"current": {
"amount": null,
"detail": "no RPC endpoint is configured, so the allowance this spender already holds could not be read",
"source": "unreadable",
"expiration": null
},
"request": {
"kind": "erc20_approve",
"mode": "absolute",
"owner": "0x9f2C5E4a8DB1C3A7e6b0d4f8C1e2A5b7d9c0E3f4",
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "0",
"target": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"spender": "0x2626664c2603336E57B271c5C0b26F421741e481",
"summary": "Revoke 0x2626664c2603336E57B271c5C0b26F421741e481's allowance on token 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 by setting it to zero.",
"deadline": null,
"token_id": null,
"expiration": null
},
"spender": {
"proxy": {
"kind": "unknown",
"admin": null,
"beacon": null,
"detail": "no RPC endpoint is configured, so no slot could be read",
"address": "0x2626664c2603336E57B271c5C0b26F421741e481",
"upgradeable": null,
"slots_probed": [],
"implementation": null
},
"detail": "no RPC endpoint is configured, so it is unknown whether the spender has code",
"address": "0x2626664c2603336E57B271c5C0b26F421741e481",
"is_contract": null
},
"input_shape": "calldata",
"denylist_hits": [],
"classification": {
"basis": "the allowance is zero, which is bounded without reference to the token's supply",
"scope": "bounded",
"subject": "resulting_allowance",
"total_supply": null,
"supply_checked": true,
"resulting_allowance": "0"
}
},
"verdict": "allow",
"evidence": [
{
"code": "CURRENT_ALLOWANCE_UNREADABLE",
"detail": "The allowance 0x2626664c2603336E57B271c5C0b26F421741e481 already holds could not be read: no RPC endpoint is configured, so the allowance this spender already holds could not be read. Whether this request adds to an existing allowance or replaces one is therefore unknown. It does not change the answer: this request cannot increase what the spender can move.",
"source": "rpc",
"severity": "info"
},
{
"code": "SPENDER_CODE_UNREADABLE",
"detail": "Whether 0x2626664c2603336E57B271c5C0b26F421741e481 is a contract or an account could not be determined: no RPC endpoint is configured, so it is unknown whether the spender has code. It does not change the answer: this request cannot increase what the spender can move.",
"source": "rpc",
"severity": "info"
},
{
"code": "SPENDER_PROXY_OPAQUE",
"detail": "The code that would execute on 0x2626664c2603336E57B271c5C0b26F421741e481's behalf could not be resolved: no RPC endpoint is configured, so no slot could be read. An allowance to a contract whose executing code is unknown is an allowance to unknown code. It does not change the answer: this request cannot increase what the spender can move.",
"source": "rpc",
"severity": "info"
}
],
"warnings": [],
"confidence": 1,
"risk_codes": [],
"request_hash": "sha256:a88cb1eea90d411505068349493a5cf35a1f2b46f4cbb4185330ffd4094c65fb",
"data_versions": {
"chain": "eip155:8453",
"policy": "2026-09-19",
"denylist": "2026-08-03.1",
"abi_packs": "2026-08-03.1",
"signature_index": "2026-08-03.1",
"allowance_sentinels": "4"
},
"policy_version": "2026-09-19"
}
}
},
"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",
"oneOf": [
{
"required": [
"approval"
]
},
{
"required": [
"calldata"
]
}
],
"title": "AllowanceGuardRequest",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"approval": {
"type": "object",
"required": [
"owner",
"token",
"spender",
"amount"
],
"properties": {
"kind": {
"enum": [
"erc20",
"increase",
"decrease",
"approval_for_all",
"permit2",
"eip2612"
],
"type": "string",
"default": "erc20",
"description": "increase and decrease are relative to the allowance already on chain, so their direction is known even when that allowance cannot be read."
},
"owner": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "The account whose balance the spender would be able to move."
},
"token": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "The token or NFT collection. For a Permit2 grant this is still the token."
},
"amount": {
"type": "string",
"pattern": "^(?:[0-9]+|0x[0-9a-fA-F]+|all)$",
"examples": [
"1000000",
"all",
"0"
],
"description": "Base units, not a human amount: 1 USDC is \"1000000\". Use \"all\" only with kind approval_for_all, and \"0\" to revoke."
},
"spender": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$"
},
"expiration": {
"type": "string",
"description": "Unix seconds. Permit2 only: a plain ERC-20 allowance never expires, so declaring one on any other kind is rejected."
}
},
"description": "The grant you are about to make, described directly.",
"additionalProperties": false
},
"calldata": {
"type": "object",
"required": [
"from",
"to",
"data"
],
"properties": {
"to": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "The token, or Permit2 (0x000000000022D473030F116dDEE9F6B43aC78BA3) for a Permit2 grant."
},
"data": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{8,}$",
"description": "approve, increaseAllowance, decreaseAllowance, setApprovalForAll, an EIP-2612 permit, or either Permit2 form. Anything else is rejected as UNSUPPORTED and not charged."
},
"from": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$"
}
},
"description": "The unsigned call you are about to sign. Decodes 7 approval functions.",
"additionalProperties": false
}
},
"description": "Send exactly one of approval or calldata. Unrecognised fields are rejected rather than ignored, so a misspelled amount is an error and not a silently different question.",
"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",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"ok",
"verdict",
"result",
"request_hash",
"data_versions"
],
"properties": {
"ok": {
"type": "boolean"
},
"result": {
"type": "object",
"properties": {
"delta": {
"type": "object",
"description": "increase, decrease, unchanged or unknown, plus whether it raises exposure."
},
"token": {
"type": "object"
},
"current": {
"type": "object",
"description": "The allowance the spender already holds, or null."
},
"request": {
"type": "object",
"description": "The normalised grant: owner, token, spender, amount."
},
"spender": {
"type": "object",
"description": "Contract or account, plus proxy status."
},
"unresolved": {
"type": "array",
"items": {
"type": "string"
}
},
"denylist_hits": {
"type": "array",
"items": {
"type": "object"
}
},
"classification": {
"type": "object",
"properties": {
"scope": {
"enum": [
"infinite",
"effectively_infinite",
"bounded"
],
"type": "string"
}
},
"description": "scope plus the basis naming the rule that produced it."
}
}
},
"verdict": {
"enum": [
"allow",
"warn",
"block",
"unknown"
],
"type": "string",
"description": "Precedence: block, then unknown, then warn, then allow. unknown is a real answer and is never a safe one."
},
"evidence": {
"type": "array",
"items": {
"type": "object"
}
},
"warnings": {
"type": "array",
"items": {
"type": "string"
}
},
"risk_codes": {
"type": "array",
"items": {
"type": "string"
}
},
"request_hash": {
"type": "string"
},
"data_versions": {
"type": "object"
},
"policy_version": {
"type": "string"
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-24 07:39Z
- Last indexed by Roundhouse
- 2026-09-25 05:30Z
- Last enriched (probe, favicon, geo)
- 2026-09-19 20:45Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 404
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. 5 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 AllowanceGuard 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=AllowanceGuard' 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://allowance.schemasure.com/v1/guard/allowance, 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.