Use when an agent needs b402 preflight
Use when an agent needs b402 preflight. Returns Validate BNB/B402 payment intent freshness, recipient, amount, deadline, fee cap, public BNB balance, and recent activity without custody or payment relay. $0.01.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
21 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.oblique.markets/api/v1/paid/b402-preflight
| Category | Market data |
|---|---|
| Provider host | api.oblique.markets |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 7 from 3 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.01 | 21 ms |
Example input (from the provider)
{
"body": {
"amount": "example",
"asset": "native/BNB or a BEP-20 contract address",
"chain": "bnb",
"deadline": "example",
"fee_cap": "Maximum network fee in BNB",
"intent_id": "example",
"payer": "example",
"recipient": "example"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"amount": {
"type": "string"
},
"asset": {
"description": "native/BNB or a BEP-20 contract address",
"type": "string"
},
"chain": {
"enum": [
"bnb",
"bnb-smart-chain",
"eip155:56",
"56"
],
"type": "string"
},
"deadline": {
"description": "ISO-8601 timestamp or Unix seconds"
},
"fee_cap": {
"description": "Maximum network fee in BNB",
"type": "string"
},
"intent_id": {
"type": "string"
},
"payer": {
"type": "string"
},
"recipient": {
"type": "string"
}
},
"required": [
"payer",
"recipient",
"asset",
"amount",
"chain",
"deadline",
"fee_cap",
"intent_id"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"amount": {
"type": "string"
},
"amount_units": {
"type": "string"
},
"asset": {
"type": "string"
},
"asset_balance": {
"type": "string"
},
"chain": {
"type": "string"
},
"decision": {
"type": "string"
},
"evidence_hash": {
"type": "string"
},
"evidence_source": {
"type": "string"
},
"fee_cap_bnb": {
"type": "string"
},
"fee_cap_sufficient": {
"type": "boolean"
},
"fee_headroom_bnb": {
"type": "string"
},
"intent_hash": {
"type": "string"
},
"intent_id": {
"type": "string"
},
"payer": {
"type": "string"
},
"recent_activity": {
"properties": {
"incoming_transfer_count": {
"type": "integer"
},
"latest_block": {
"type": "integer"
},
"lookback_blocks": {
"type": "integer"
},
"nonce": {
"type": "integer"
},
"outgoing_transfer_count": {
"type": "integer"
}
},
"type": "object"
},
"recipient": {
"type": "string"
},
"recipient_valid": {
"type": "boolean"
},
"signature": {
"type": "string"
},
"signing_key_id": {
"type": "string"
},
"timestamp": {
"type": "string"
}
},
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}