Connect GPT55 Model Gateway and your agent gets 218 tools, among them chat_gpt_5_3_codex, chat_gpt_5_4, chat_gpt_5_5. It answers at https://gpt55.558686.xyz/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 6 of 6 times since 12 September 2026; the last check, on 24 October 2026, succeeded.
Remote MCP gateway for GPT-5.6 Luna, Soul, Terra, and x402-paid agent tools with no API key.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
chat_gpt_5_3_codex | GPT-5.3 Codex chat for coding-oriented agent work, patch planning, and structured development output. Pay $0.007472 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/liv Inputs: model, messages, max_tokens, stream |
chat_gpt_5_4 | GPT-5.4 chat for high-quality general reasoning, coding, and structured responses. Pay $0.010109 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json. Inputs: model, messages, max_tokens, stream |
chat_gpt_5_5 | GPT-5.5 chat for stronger reasoning, production work, code, and structured responses. Pay $0.019999 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json. Inputs: model, messages, max_tokens, stream |
chat_gpt_5_6_luna | GPT-5.6 Sol chat on the independently verified upstream gpt-5.6-luna model. Pay $0.019999 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json. Inputs: model, messages, max_tokens, stream |
chat_gpt_5_6_soul | GPT-5.6 Soul flagship chat for advanced reasoning, production work, code, and structured responses at GPT-5.5-matched pricing. Pay $0.099995 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https:// Inputs: model, messages, max_tokens, stream |
chat_gpt_5_6_terra | GPT-5.6 Terra chat on the independently verified upstream gpt-5.6-terra model. Pay $0.049998 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json. Inputs: model, messages, max_tokens, stream |
chat_standard | GPT-5.6 Luna Standard chat for mainstream short answers, routing decisions, extraction helpers, and buyer trials. The legacy mini path remains available as a compatibility alias. Pay $0.00293 per request with x402 exact USDC on Base or Sola Inputs: model, messages, max_tokens, stream |
gpt55_answer | Answer a short question, optionally using provided context, for lightweight QA, context question answering, support answers, research lookup, and agent reasoning steps. Standard quality tier uses gpt-5.6-luna; price is derived from official Inputs: question, context, max_tokens, temperature |
gpt55_answer_mini | Low-cost short answers and context QA. Model tier: mini; upstream model: gpt-5.6-luna. Price is derived from official OpenAI relative token costs with a local margin and floor. Pay $0.00293 per request with x402 exact USDC on Base or Solana Inputs: max_tokens, temperature |
gpt55_answer_plus | Plus answers for more context, reasoning, and structured output. Model tier: plus; upstream model: gpt-5.5. Price is derived from official OpenAI relative token costs with a local margin and floor. Pay $0.145 per request with x402 exact USD Inputs: max_tokens, temperature |
gpt55_answer_professional | Professional answers for higher-fidelity reasoning and decision support. Model tier: professional; upstream model: gpt-5.5. Price is derived from official OpenAI relative token costs with a local margin and floor. Pay $0.145 per request wit Inputs: max_tokens, temperature |
gpt55_answer_standard | Standard answers for context QA and short buyer questions. Model tier: standard; upstream model: gpt-5.6-luna. Price is derived from official OpenAI relative token costs with a local margin and floor. Pay $0.00293 per request with x402 exac Inputs: max_tokens, temperature |
gpt55_balance_metered_chat_completion | OpenAI-compatible GPT-5.5 chat that debits a persistent prepaid balance ledger after actual upstream usage is known using the read-only sub2api formula. Pay usage-metered balance debit per request with x402 exact USDC on Base or Solana when Inputs: model, messages, max_tokens, stream, account_id, accountId |
gpt55_balance_topup | Top up a GPT55 prepaid balance account with x402 exact USDC before using balance-metered GPT-5.5 chat. Pay $0.005 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live- Inputs: account_id, accountId, topup_usd, topupUsd, request_id, requestId |
gpt55_base64_codec | Encode UTF-8 text to Base64/Base64URL or decode Base64/Base64URL text without calling an upstream model. Pay $0.002 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/liv Inputs: mode, text, urlsafe |
gpt55_base64_codec_get | Encode UTF-8 text to Base64/Base64URL or decode Base64/Base64URL text without calling an upstream model. GET variant for agents that prefer query parameters. Pay $0.002 per request with x402 exact USDC on Base or Solana when advertised. Can Inputs: mode, text, urlsafe |
gpt55_case_convert | Convert text to upper, lower, title, sentence, camel, snake, or kebab case without calling an upstream model. Pay $0.002 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x40 Inputs: text, case |
gpt55_case_convert_get | Convert text to upper, lower, title, sentence, camel, snake, or kebab case without calling an upstream model. GET variant for agents that prefer query parameters. Pay $0.002 per request with x402 exact USDC on Base or Solana when advertised Inputs: text, case |
gpt55_code_review | Review a short code snippet or diff for bugs, edge cases, security issues, maintainability, and missing tests. Designed for agents and developers that need a quick second pass before merging. Standard quality tier uses gpt-5.6-luna; price i Inputs: code, language, focus, max_tokens, temperature |
gpt55_code_review_mini | Fast code-review triage for obvious bugs, lint risks, and missing tests. Model tier: mini; upstream model: gpt-5.6-luna. Price is derived from official OpenAI relative token costs with a local margin and floor. Pay $0.00293 per request with Inputs: max_tokens, temperature |
gpt55_code_review_plus | Plus code review for security, architecture, tests, and patch suggestions. Model tier: plus; upstream model: gpt-5.5. Price is derived from official OpenAI relative token costs with a local margin and floor. Pay $0.211 per request with x402 Inputs: max_tokens, temperature |
gpt55_code_review_pro | Deeper code review for security, architecture, tests, and patch suggestions. Model tier: professional; upstream model: gpt-5.5. Price is derived from official OpenAI relative token costs with a local margin and floor. Pay $0.211 per request Inputs: max_tokens, temperature |
gpt55_code_review_professional | Professional code review for security, architecture, tests, and production risk. Model tier: professional; upstream model: gpt-5.5. Price is derived from official OpenAI relative token costs with a local margin and floor. Pay $0.211 per req Inputs: max_tokens, temperature |
gpt55_code_review_standard | Standard code review for bugs, edge cases, maintainability, and missing tests. Model tier: standard; upstream model: gpt-5.6-luna. Price is derived from official OpenAI relative token costs with a local margin and floor. Pay $0.00293 per re Inputs: max_tokens, temperature |
gpt55_color_convert | Parse #RGB or #RRGGBB colors and return RGB/HSL values without calling an upstream model. Pay $0.002 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json. Inputs: hex |
gpt55_color_convert_get | Parse #RGB or #RRGGBB colors and return RGB/HSL values without calling an upstream model. GET variant for agents that prefer query parameters. Pay $0.002 per request with x402 exact USDC on Base or Solana when advertised. Canonical live pri Inputs: hex |
gpt55_diff_lines | Compare two newline-separated text blocks and return added, removed, and unchanged line sets without calling an upstream model. Pay $0.002 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gp Inputs: before, after |
gpt55_diff_lines_get | Compare two newline-separated text blocks and return added, removed, and unchanged line sets without calling an upstream model. GET variant for agents that prefer query parameters. Pay $0.002 per request with x402 exact USDC on Base or Sola Inputs: before, after |
gpt55_domain_extract | Extract hostname, labels, subdomain, and a naive last-two-label registrable domain from a URL or hostname without DNS or upstream model calls. Pay $0.002 per request with x402 exact USDC on Base or Solana when advertised. Canonical live pri Inputs: url, hostname |
gpt55_domain_extract_get | Extract hostname, labels, subdomain, and a naive last-two-label registrable domain from a URL or hostname without DNS or upstream model calls. GET variant for agents that prefer query parameters. Pay $0.002 per request with x402 exact USDC Inputs: url, hostname |
gpt55_eip712_signature_risk_decoder | Inspect eth_signTypedData / EIP-712 payloads before signing, including ERC20 Permit, Permit2, transferWithAuthorization, NFT operator approvals, spender fields, deadlines, nonces, chainId, verifyingContract, and unlimited allowance values. Inputs: typed_data, typedData, json, text, value, chain |
gpt55_eip712_signature_risk_decoder_get | Inspect eth_signTypedData / EIP-712 payloads before signing, including ERC20 Permit, Permit2, transferWithAuthorization, NFT operator approvals, spender fields, deadlines, nonces, chainId, verifyingContract, and unlimited allowance values. Inputs: typed_data, typedData, json, text, value, chain |
gpt55_email_normalize | Trim, split, and normalize a simple email address shape without sending mail, DNS checks, or upstream model calls. Pay $0.002 per request with x402 exact USDC on Base or Solana when advertised. Canonical live prices: https://gpt55.558686.xy Inputs: email |
gpt55_email_normalize_get | Trim, split, and normalize a simple email address shape without sending mail, DNS checks, or upstream model calls. GET variant for agents that prefer query parameters. Pay $0.002 per request with x402 exact USDC on Base or Solana when adver Inputs: email |
gpt55_evm_transaction_risk_decoder | Decode common EVM calldata before signing, including ERC20 approve/transfer/transferFrom, ERC721/ERC1155 setApprovalForAll, safeTransferFrom, increase/decreaseAllowance, permit, and multicall hints. Returns risk flags, decoded addresses, am Inputs: to, target, data, calldata, value, chain |
gpt55_evm_transaction_risk_decoder_get | Decode common EVM calldata before signing, including ERC20 approve/transfer/transferFrom, ERC721/ERC1155 setApprovalForAll, safeTransferFrom, increase/decreaseAllowance, permit, and multicall hints. Returns risk flags, decoded addresses, am Inputs: to, target, data, calldata, value, chain |
gpt55_evm_wallet_balance | Read a public EVM wallet balance on Base or Ethereum and determine whether its Base USDC balance can cover a suggested $0.001 x402 payment. Returns a coherent provider snapshot, USDC runway, shortfall, native-gas presence, and a handoff to Inputs: address, wallet, network, chain |
gpt55_evm_wallet_balance_get | Read a public EVM wallet balance on Base or Ethereum and determine whether its Base USDC balance can cover a suggested $0.001 x402 payment. Returns a coherent provider snapshot, USDC runway, shortfall, native-gas presence, and a handoff to Inputs: address, wallet, network, chain |
gpt55_extract_json | Extract structured JSON from short text according to a caller-provided schema or field list. Useful for agents that need cheap parsing, lead cleanup, invoice notes, support tickets, and lightweight ETL steps. Standard quality tier uses gpt- Inputs: text, fields, schema, max_tokens, temperature |
gpt55_extract_json_mini | Low-cost structured extraction and classification-friendly JSON output. Model tier: mini; upstream model: gpt-5.6-luna. Price is derived from official OpenAI relative token costs with a local margin and floor. Pay $0.00293 per request with Inputs: max_tokens, temperature |
gpt55_extract_json_plus, gpt55_extract_json_professional, gpt55_extract_json_standard, gpt55_github_repository_supply_chain_evidence, gpt55_gpt55_plus_half_price_subscription, gpt55_hash_text, gpt55_hash_text_get, gpt55_html_entity_codec, gpt55_html_entity_codec_get, gpt55_html_strip, gpt55_html_strip_get, gpt55_http_status, gpt55_http_status_get, gpt55_json_keys, gpt55_json_keys_get, gpt55_json_minify, gpt55_json_minify_get, gpt55_json_validate, gpt55_json_validate_get, gpt55_jwt_decode, gpt55_jwt_decode_get, gpt55_query_parse, gpt55_query_parse_get, gpt55_regex_match, gpt55_regex_match_get, gpt55_rewrite, gpt55_rewrite_mini, gpt55_rewrite_plus, gpt55_rewrite_professional, gpt55_rewrite_standard, gpt55_slugify, gpt55_slugify_get, gpt55_sort_lines, gpt55_sort_lines_get, gpt55_sub2api_balance_ledger_simulator, gpt55_sub2api_official_metered_invoice, gpt55_summarize, gpt55_summarize_mini, gpt55_summarize_plus, gpt55_summarize_pro, gpt55_summarize_professional, gpt55_summarize_standard, gpt55_text_stats, gpt55_text_stats_get, gpt55_timestamp, gpt55_timestamp_get, gpt55_translate, gpt55_translate_batch, gpt55_translate_get, gpt55_translate_mini, gpt55_translate_plus, gpt55_translate_pro, gpt55_translate_professional, gpt55_translate_standard, gpt55_unique_lines, gpt55_unique_lines_get, gpt55_uri_codec, gpt55_uri_codec_get, gpt55_url_links, gpt55_url_links_get, gpt55_url_metadata, gpt55_url_metadata_get, gpt55_url_parse, gpt55_url_parse_get, gpt55_url_text, gpt55_url_text_get, gpt55_uuid, gpt55_uuid_get, gpt55_wallet_signing_safety_pack, gpt55_wallet_signing_safety_pack_get, gpt55_x402_agent_approval_workflow_compiler, gpt55_x402_agent_core_integration_kit, gpt55_x402_agent_core_integration_kit_get, gpt55_x402_agent_credit_line_underwriting_pack, gpt55_x402_agent_data_leak_containment_plan, gpt55_x402_agent_market_data_procurement_firewall, gpt55_x402_agent_payment_approval_pack, gpt55_x402_agent_payment_authorization_ato_pack, gpt55_x402_agent_payment_due_diligence_pack, gpt55_x402_agent_payment_due_diligence_pack_get, gpt55_x402_agent_payment_policy_compiler, gpt55_x402_agent_procurement_rfp_response_pack, gpt55_x402_agent_runbook_compliance_attestation_pack, gpt55_x402_agent_spend_recurrence_guard, gpt55_x402_agent_spend_simulator, gpt55_x402_agent_task_receipt_outbox, gpt55_x402_agent_treasury_rebalancing_policy, gpt55_x402_agent_wallet_incident_response_pack, gpt55_x402_agent_wallet_key_rotation_drill, gpt55_x402_agentic_api_red_team_brief, gpt55_x402_ai_crawler_license_enforcement_pack, gpt55_x402_autonomous_procurement_policy_engine, gpt55_x402_base_builder_funding_readiness, gpt55_x402_base_builder_funding_readiness_get, gpt55_x402_batch_quote_inspector, gpt55_x402_batch_quote_inspector_get, gpt55_x402_bazaar_listing_revenue_repair, gpt55_x402_bazaar_search, gpt55_x402_bazaar_search_get, gpt55_x402_buyer_client_adapter_pack, gpt55_x402_buyer_payment_client_implementation_sprint, gpt55_x402_buyer_payment_execution_runbook, gpt55_x402_buyer_prepay_risk_score, gpt55_x402_buyer_prepay_risk_score_get, gpt55_x402_buyer_shortlist, gpt55_x402_buyer_shortlist_get, gpt55_x402_client_compatibility_adapter, gpt55_x402_client_compatibility_adapter_get, gpt55_x402_conversion_forensics_war_room, gpt55_x402_crawler_monetization_kit, gpt55_x402_crawler_monetization_kit_get, gpt55_x402_cross_chain_payment_failover_playbook, gpt55_x402_customer_support_refund_triage_agent, gpt55_x402_data_room_receipt_redaction_pack, gpt55_x402_directory_compliance_repair_pack, gpt55_x402_directory_compliance_repair_pack_get, gpt55_x402_directory_rank_tracker, gpt55_x402_directory_rank_tracker_get, gpt55_x402_directory_trust_evidence_pack, gpt55_x402_discovery_price_compare, gpt55_x402_discovery_price_compare_get, gpt55_x402_enterprise_buyer_onboarding_dossier, gpt55_x402_enterprise_security_questionnaire_autofill, gpt55_x402_flowise_payment_node_blueprint, gpt55_x402_listing_seo_audit, gpt55_x402_listing_seo_audit_get, gpt55_x402_market_benchmark, gpt55_x402_market_benchmark_get, gpt55_x402_mcp_asset_inventory_risk_register, gpt55_x402_mcp_enterprise_rollout_pack, gpt55_x402_mcp_entitlement_receipt_gateway, gpt55_x402_mcp_integration_kit, gpt55_x402_mcp_integration_kit_get, gpt55_x402_mcp_production_launch_audit, gpt55_x402_mcp_tenant_entitlement_isolation_pack, gpt55_x402_mcp_tool_revenue_share_ledger, gpt55_x402_model_arbitrage_router_policy, gpt55_x402_model_procurement_benchmark_pack, gpt55_x402_model_sla_breach_claims_pack, gpt55_x402_opportunity_finder, gpt55_x402_opportunity_finder_get, gpt55_x402_paid_api_contract_test_suite, gpt55_x402_paid_mcp_authorization_bridge, gpt55_x402_payment_failure_doctor, gpt55_x402_payment_failure_doctor_get, gpt55_x402_payment_retry_slo_autopilot, gpt55_x402_payment_slo_monitoring_pack, gpt55_x402_payment_tax_invoice_reconciliation_kit, gpt55_x402_ping, gpt55_x402_prepay_trust_check, gpt55_x402_prepay_trust_check_get, gpt55_x402_private_gateway_deployment_plan, gpt55_x402_procurement_vendor_risk_dossier, gpt55_x402_quote_inspector, gpt55_x402_quote_inspector_get, gpt55_x402_receipt_bound_execution_gate, gpt55_x402_receipt_dispute_pack, gpt55_x402_receipt_dispute_pack_get, gpt55_x402_refund_dispute_resolution_playbook, gpt55_x402_revenue_recovery_agent, gpt55_x402_seller_action_plan, gpt55_x402_seller_action_plan_get, gpt55_x402_seller_intelligence_bundle, gpt55_x402_seller_intelligence_bundle_get, gpt55_x402_seller_price_ladder_optimizer, gpt55_x402_seller_revenue_leakage_forensics_pack, gpt55_x402_settlement_dispute_evidence_lockbox, gpt55_x402_site_audit, gpt55_x402_site_audit_get, gpt55_x402_soc2_payment_control_evidence_pack, gpt55_x402_usage_quota_billing_reconciliation_agent, gpt55_x402_verify_settle_recovery_pack, gpt55_x402_wallet_drain_prevention_firewall, gpt55_x402_wallet_funding_readiness_doctor, gpt55_x402_wallet_funding_readiness_doctor_get, gpt55_x402_wallet_payment_activation_agent, gpt55_x402_wallet_payment_activation_agent_get, gpt55_x402_wallet_receipt_accounting_pack
Every block below points at https://gpt55.558686.xyz/mcp. Pick your client and copy.
claude mcp add --transport http gpt55-model-gateway https://gpt55.558686.xyz/mcp
{
"mcpServers": {
"gpt55-model-gateway": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://gpt55.558686.xyz/mcp"]
}
}
}{
"mcpServers": {
"gpt55-model-gateway": {
"url": "https://gpt55.558686.xyz/mcp"
}
}
}{
"servers": {
"gpt55-model-gateway": {
"type": "http",
"url": "https://gpt55.558686.xyz/mcp"
}
}
}{
"context_servers": {
"gpt55-model-gateway": {
"url": "https://gpt55.558686.xyz/mcp"
}
}
}{
"mcpServers": {
"gpt55-model-gateway": {
"serverUrl": "https://gpt55.558686.xyz/mcp"
}
}
}{
"mcpServers": {
"gpt55-model-gateway": {
"url": "https://gpt55.558686.xyz/mcp"
}
}
}name: GPT55 Model Gateway
version: 0.0.1
schema: v1
mcpServers:
- name: GPT55 Model Gateway
type: streamable-http
url: https://gpt55.558686.xyz/mcp{
"mcpServers": {
"gpt55-model-gateway": {
"httpUrl": "https://gpt55.558686.xyz/mcp"
}
}
}{
"mcpServers": {
"gpt55-model-gateway": {
"type": "http",
"url": "https://gpt55.558686.xyz/mcp"
}
}
}{
"mcpServers": {
"gpt55-model-gateway": {
"url": "https://gpt55.558686.xyz/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fgpt55.558686.xyz%2Fmcp&type=streamable_http&id=gpt55-model-gateway&name=GPT55%20Model%20Gateway
It answered our last check on 24 October 2026 in 1920 ms. Over 6 checks since 12 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.
Yes. It is published by 558686.xyz and served from gpt55.558686.xyz, the vendor's own domain: https://gpt55.558686.xyz/mcp.
218, as returned by the server's own tools/list on 23 September 2026: chat_gpt_5_3_codex, chat_gpt_5_4, chat_gpt_5_5, chat_gpt_5_6_luna, chat_gpt_5_6_soul, chat_gpt_5_6_terra, chat_standard, gpt55_answer, and 210 more.
It answered our last check on 24 October 2026 in 1920 ms. Over 6 checks since 12 September 2026 it answered 6.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://gpt55.558686.xyz/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: xyz.558686.gpt55. Endpoint host: gpt55.558686.xyz. ARD identifier: urn:air:xyz.558686.gpt55:mcp:token-gateway.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.