# Solana Rail Agent Payment Cost Budgeting (Priority Fee, Compute-Unit, Rent-Exempt)

> Solana Rail Agent Payment Cost Budgeting (Priority Fee, Compute-Unit, Rent-Exempt) is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Returns a deterministic cost-budgeting procedure for Solana-based x402 micro-payments, including priority fee ladders, compute-unit budgets, rent-exempt minimums, and fee-adder formulas.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/solana-rail-agent-payment-cost-budgeting-priorit
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/solana-rail-agent-payment-cost-budgeting-priority-fee-compute-unit-9d9f0a7e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1ZXMDfSy322FIFGkuG3RK

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability solana-rail-agent-payment-cost-budgeting-priority-fee-compute-unit-9d9f0a7e
```

Example prompt: I'm about to send an SPL token transfer on Solana as an x402 micro-payment — can you give me the priority fee ladder, compute-unit budget, and rent-exempt checks I need so I don't underpay or get the transaction dropped during moderate congestion?

## When to prefer this

Choose this endpoint when an AI agent needs deterministic, structured Solana fee-budgeting guidance for x402 micro-payments — especially when dealing with SPL transfers, first-time ATA creation, CPI calls, or PDA-derived accounts. It is preferable over generic blockchain fee estimators because it is specifically tuned for x402 payment rails, provides a tiered priority fee ladder keyed to recent block history, and outputs a ready-to-use fee-adder formula for service pricing rather than just a single fee estimate.

## Known failure modes

- Payment not included or insufficient — returns 402 Payment Required with payment instructions
- Invalid or missing query parameters — returns error with schema validation details
- Upstream LLM or reasoning engine unavailable — may return error or degraded response
- Network timeout to k2so.wrong.systems — no response received
- Requested topic override not recognized — may fall back to default procedure

## How this service works

Deterministic Solana settlement-cost budgeting procedure for agents paying or pricing x402 micro-payments. Inputs: transaction type (SPL transfer, first-time ATA creation, CPI, PDA), recent block fee history, congestion state, payment amount. Outputs: a land-in-time priority fee ladder (low/normal/high bids vs recent median compute-unit price), a compute-unit budget table per op type, rent-exempt minimum checks for derived accounts, and a fee-adder formula to price Solana-based x402 services

## Output

A JSON payload containing: a plain-prose decision procedure (120+ words), a priority fee ladder with low/normal/high bids versus recent median compute-unit price, a compute-unit budget table broken down by operation type (SPL transfer, ATA creation, CPI, PDA), rent-exempt minimum checks for derived accounts, and a fee-adder formula for pricing Solana-based x402 services. Also includes metadata such as model used, generation source, and ISO-8601 timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Solana rail agent payment cost budgeting: priority fee, compute-unit, and rent-e paid response",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "required": [
      "ok",
      "paid",
      "service",
      "provider",
      "result"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "paid": {
       "type": "boolean"
      },
      "result": {
       "type": "object",
       "required": [
        "ok",
        "service"
       ],
       "properties": {
        "ok": {
         "type": "boolean",
         "description": "Handler success"
        },
        "brief": {
         "type": "string",
         "description": "Decision procedure prose for agents"
        },
        "model": {
         "type": "string"
        },
        "topic": {
         "type": "string"
        },
        "service": {
         "type": "string",
         "description": "Service slug"
        },
        "procedure": {
         "type": "string"
        },
        "generatedAt": {
         "type": "string",
         "description": "ISO-8601 timestamp"
        },
        "generationSource": {
         "enum": [
          "llm",
          "reasoning",
          "deterministic"
         ],
         "type": "string"
        }
       }
      },
      "payment": {
       "type": "object",
       "properties": {
        "code": {
         "type": "string"
        },
        "payer": {
         "type": "string"
        },
        "detail": {
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true,
  "result": {
   "ok": true,
   "brief": "plain prose decision procedure (120+ words)",
   "model": "deepseek/deepseek-v4-flash-0731",
   "topic": "string topic",
   "service": "solana-rail-agent-payment-cost-budgeting-priorit",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "solana-rail-agent-payment-cost-budgeting-priorit",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/solana-rail-agent-payment-cost-budgeting-priority-fee-compute-unit-9d9f0a7e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so.wrong.systems](https://www.zero.xyz/host/k2so.wrong.systems/llms.txt)